0257-2110,0257-2110, 1470.490257-2110, 1470.490257-2110, 1601.86 1601.860257-2115,0257-2115, 1799.81 1799.810257-2120,0257-2120, 1604.63 1604.630257-2125,0257-2125, 1804.40 1804.400257-2130,0257-2130, 1604.06 1604.060257-2135,0257-2135, 1810.08 0257-2140S,1810.080257-2140S, 1603.71 0257-2145,1603.710257-2145, 1814.56 1814.560257-2150,0257-2150, 1602.61 1602.610257-2155,0257-2155, 1819.05 1819.050257-2160,0257-2160, 2522.44 2522.440257-2165,0257-2165, 1562.18 1562.180257-2170,0257-2170, 1601.40 1601.400257-2175,0257-2175, 1829.73 1829.730257-2180,0257-2180, 1601.58 1601.580257-2185,0257-2185, 1834.88 1834.880257-2190,0257-2190, 1601.57 1601.570257-2195,0257-2195, 1840.50 1840.500257-2200,0257-2200, 1602.23 1602.230257-2205,0257-2205, 1847.01 1847.010257-2210,0257-2210, 1602.30 1602.300257-2215,0257-2215, 1852.47 1852.470257-2220,0257-2220, 1602.36 1602.36 0257-2230,0257-2230, 1602.29 1602.29 0257-2240,0257-2240, 1602.63 1602.63 0257-2250,0257-2250, 1603.02 1603.02 0257-2270,0257-2270, 1603.21 1603.21 - 0257-1310- 0257-1310 - - SP: 1154.51160.0SP:1180.01200.01220.01154.51160.01240.01180.01260.01200.01280.01220.01300.01240.01320.01260.01340.01280.01360.01300.01380.01320.01400.01340.01420.01360.01440.01380.01460.01400.01480.01420.01500.01440.01520.01460.01540.01480.01560.01500.01580.01520.01600.01540.01620.01560.01640.01580.01660.01600.01680.01620.01700.01640.01720.01660.01740.01680.01760.01700.01780.01720.01800.01740.01820.01760.01840.01780.01860.01800.01880.01820.01900.01840.01920.01860.01940.01880.01960.01900.01980.01920.02000.01940.02020.01960.02040.01980.02060.02000.02080.02020.02100.02040.02120.02060.02140.02080.02160.02100.02180.02120.02200.02140.02220.02160.02240.02180.02260.02200.02280.02220.02300.02240.02320.02260.02340.02280.02360.02300.02380.02320.02400.02340.02420.02360.02440.02380.02460.02400.02480.02420.02500.02440.02520.02460.02540.02480.02560.02500.02580.02520.02600.02540.02620.02560.02640.02580.02660.02600.02680.02620.02700.02640.02720.02660.02740.02680.02760.02700.02780.02720.02800.02740.02820.02760.02840.02780.02860.02800.02880.02820.02900.02840.02920.02860.02940.02880.02960.02900.02980.02920.03000.02940.03020.02960.03040.02980.03060.03000.03080.03020.03100.03040.03120.03060.03140.03080.03160.03100.03180.03120.03200.03140.03220.03160.03240.03180.03260.03200.03280.03220.03300.03240.03320.03260.03340.03280.03360.03300.03380.03320.03400.03340.03420.03360.03440.03380.03460.03400.03480.03420.03500.03440.03520.03460.03540.03480.03560.03500.03580.03520.03600.03540.03620.03560.03640.03580.03660.03600.03680.03620.03700.03640.03720.03660.03740.03680.03760.03700.03780.03720.03800.03740.03820.03760.03840.03780.03860.03800.03880.03820.03900.03840.03920.03860.03940.03880.03960.03900.03980.03920.04000.03940.04020.03960.04040.03980.04060.04000.04080.04020.04100.04040.04120.04060.04140.04080.04160.04100.04180.04120.04200.04140.04220.04160.04240.04180.04260.04200.04280.04220.04300.04240.04320.04260.04340.04280.04360.04300.04380.04320.04400.04340.04420.04360.04440.04380.04460.04400.04480.04420.04500.04440.04520.04460.04540.04480.04560.04500.04580.04520.04600.04540.04620.04560.04640.04580.04660.04600.04680.04620.04700.04640.04720.04660.04740.04680.04760.04700.04780.04720.04800.04740.04820.04760.04840.04780.04860.04800.04880.04820.04900.04840.04920.04860.04940.04880.04960.04900.04980.04920.05000.04940.05020.04960.05040.04980.05060.05000.05080.05020.05100.05040.05120.05060.05140.05080.05160.05100.05180.05120.05200.05140.05220.05160.05240.05180.05260.05200.05280.05220.05300.05240.05320.05260.05340.05280.05360.05300.05380.05320.05400.05340.05420.05360.05440.05380.05460.05400.05480.05420.05500.05440.05520.05460.05540.05480.05560.05500.05580.05520.05600.05540.05620.05560.05640.05580.05660.05600.05680.05620.05700.05640.05720.05660.05740.05680.05760.05700.05780.05720.05800.05740.05820.05760.05840.05780.05860.05800.05880.05820.05900.05840.05920.05860.05940.05880.05960.05900.05980.05920.06000.05940.06020.05960.06040.05980.06060.06000.06080.06020.06100.06040.06120.06060.06140.06080.06160.06100.06180.06120.06200.06140.06220.06160.06240.06180.06260.06200.06280.06220.06300.06240.06320.06260.06340.06280.06360.06300.06380.06320.06400.06340.06420.06360.06440.06380.06460.06400.06480.06420.06500.06440.06520.06460.06540.06480.06560.06500.06580.06520.06600.06540.06620.06560.06640.06580.06660.06600.06680.06620.06700.06640.06720.06660.06740.06680.06760.06700.06780.06720.06800.06740.06820.06760.06840.06780.06860.06800.06880.06820.06900.06840.06920.06860.06940.06880.06960.06900.06980.06920.07000.06940.07020.06960.07040.06980.07060.07000.07080.07020.07100.07040.07120.07060.07140.07080.07160.07100.07180.07120.07200.07140.07220.07160.07240.07180.07260.07200.07280.07220.07300.07240.07320.07260.07340.07280.07360.07300.07380.07320.07400.07340.07420.07360.07440.07380.07460.07400.07480.07420.07500.07440.07520.07460.07540.07480.07560.07500.07580.07520.07600.07540.07620.07560.07640.07580.07660.07600.07680.07620.07700.07640.07720.07660.07740.07680.07760.07700.07780.07720.07800.07740.07820.07760.07840.07780.07860.07800.07880.07820.07900.07840.07920.07860.07940.07880.07960.07900.07980.07920.08000.07940.08020.07960.08040.07980.08060.08000.08080.08020.08100.08040.08120.08060.08140.08080.08160.08100.08180.08120.08200.08140.08220.08160.08240.08180.08260.08200.08280.08220.08300.08240.08320.08260.08340.08280.08360.08300.08380.08320.08400.08340.08420.08360.08440.08380.08460.08400.08480.08420.08500.08440.08520.08460.08540.08480.08560.08500.08580.08520.08600.08540.08620.08560.08640.08580.08660.08600.08680.08620.08700.08640.08719.08660.08680.08700.08719.0 Evaluation of up to 16,000 km of modern, high quality, long-offset Figure 1: Figure 2: The long-offset 2D seismic data was processed through produce conditioned-angle gathers, calibrated with existing to the east and south-east, where they have an added Spectrum Constrained 2D seismic data, acquired by Spectrum in 2014 over the Sergipe seismic data gravity pre-stack time migration using conventional techniques, well data, indicating numerous potential AVO anomalies opportunity in a basin floor fan setting. To the north- B r a z i l and through pre-stack depth migration using both (Saunders et al., GEO ExPro, Vol. 11, No. 5). east, primarily in Alagoas, channel fill sediment play, Alagoas Basin (Figure 1), has confirmed the extension of a turbidite Maceio and 2017 model. 0 0 Sergipe Basin Undrilled 0 0 blocks. -100 -100 channel system into open acreage offered in the ongoing licensing conventional and broadband processing techniques. Ship-borne gravity data has also been integrated with rifted basin fill, and faulted Palaeozoic sediments are all -100 -100 -200 -200 -200 -200 -300 -300 The application of these two technologies resulted in the seismic interpretation of a relatively clear Moho exploration targets. As part of the current licensing Round -300 -300 -400 -400 Round 14. This channel system has been proven to contain several -400 -400 -500 -500 -500 -500 -600 -600 seismic data with a vertical resolution as fine as 5–10m reflection on the PSDM sections, to produce a series of 14 and with strong indications of huge untapped potential, -600 -600 -700 -700 billion barrels of reserves from recent exploration programmes, -700 -700 -800 -800 (Saunders et al., First Break, 2015), allowing identification density models (see Figure 2). This modelling exercise exploration activity, inclusive of drilling in this highly -800 -800 -900 -900 including the Barra, Muriu and Farfan discoveries. Integration of Aracaju -900 -900 -1000 -1000 Potential Surpasses Giant -1000 -1000 -1100 -1100 of additional levels of interest which are mostly beyond has resulted in a very clear interpretation of the crustal prospective area, is expected to yield continued success, -1100 -1100 -1200 -1200 derived seismic attributes and potential field data has resulted in -1200 -1200 -1300 -1300 -1300 -1300 -1400 -1400 seismic resolution in the conventionally processed architecture. The outcome of the exercise will be a higher with undrilled potential surpassing discovered resources. -1400 -1400 -1500 -1500 a better understanding of the main elements of the petroleum -1500 -1500 -1600 -1600 seismic data. confidence in crustal architecture, leading to improved -1600 -1600 -1700 -1700 -1700 -1700 -1800 -1800 system, allowing for the identification of multiple untested play -1800 -1800 -1900 -1900 Additionally, AVO stacks and attributes have been heat flow prediction and thermal maturity profiles. -1900 -1900 -2000 -2000 Offshore Discoveries -2000 -2000 -2100 -2100 types. This evaluation demonstrates that the undrilled potential generated over an area encompassing the Sergipe Detailed evaluation of available seismic data indicates -2100 -2100 -2200 -2200 -2200 -2200 -2300 -2300 -2300 -2300 -2400 -2400 PSDM dip line showing syn- and post-rift targets as well as candidate Moho deep reflectors. offshore Sergipe may surpass the discovered resources to date. Sub-basin. 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!!! ! ! ! ! ! ! ! !! ! ! ! WHEN LOOKING FOR OIL AND GAS, ! ! Two other discoveries in the deepwater area of this has been put together to illustrate the various play types ! !! !! ! ! !!!! ! !!
! basin include the Muriu and Farfan finds, with estimates identified in the Sergipe Basin (see Figure 3, beginning of ! ! ! ! !! ! !! !! ! ! !! ! !!!!!!! ! !! ! indicating 3 Bboip and rising due to other exploration article). Source rock, reservoir, seal and trap evaluation has !!! ! ! ! ! ! ! ! !! !! ! Barra! ! !! YOU GO TO THE MOST PROMISING SITE. ! Sergipe Basin ! successes, including the latest Poço Verde discovery been combined with amplitude and AVA anomaly analysis, ! ! ! SEAL-M-349 SEAL-M-351 Aracaju! ! ! Cumbe Brazil ! ! ! PETROBRAS!! QGEP ! ! ! ! ! !!!!! ! ! (Figure 4). These discoveries are in turbidite channel resulting in up to 14 different potential targets in pre- to !!!! ! ! ! ! !!!!!! !!! !!!! !!!!!!!!!! ! ! ! !!!!! !!!!!! ! !!!!!!!!!! ! ! ! !! ! !!!! ! !!!!!!!!!! ! ! !!! !! !!! !!! ! !! ! ! !! !!! ! !! ! ! !! ! ! ! ! ! !! !! ! ! ! !! ! !!!!!!!! ! ! ! ! !!! ! ! Farfan !!!!!!!! !!! ! SEAL-M-426 SEAL-M-428 syn-rift and post-rift sequences which have been mapped ! ! systems of Mid to Late Cretaceous and Early Tertiary ! !!!!!!! ! !!!!!!! !!! ! ! !!!!!!! !!!! !!!!!!! ! ! ! ! ! ! !!!!!!!!! ! ! ! ! !!!! ! ! ! ! ! ! !!!!! !! PETROBRAS QGEP THE SAME HOLDS TRUE ! ! ! !!! ! ! ! ! ! ! ! ! ! BM-SEAL-004A ! ! ! ! ! ! ! age. They are associated with clear amplitude anomalies and are potentially associated with hydrocarbon indicators. !!! ! ! PETROBRAS! ! ! ! ! ! !! ! !! ! ! ! Potential Revealed ! Muriu ! !! !!! SEAL-M-499 ! ! ! ! ! ! !! !! as illustrated in both dip and strike seismic sections over These play types include the proven stratigraphic seaward ! PETROBRAS ! ! !
!! !! ! ! the Barra discovery (Figure 5). dipping Late Cretaceous Calumbi Formation slope apron ! WHEN LOOKING FOR DEALS. Bonita Integration of seismic attributes and potential field data has resulted in a better Using the angle stack attribute (Far-Near*Far) it and base of slope deepwater turbidites. understanding of the main elements of the petroleum system, allowing for the Poco Verde was possible to identify multiple undrilled amplitude Many new untested play types include Early and AVA anomalies, with similar character to the Barra Cretaceous syn-rift 3-way dip closures with fault seal identification of multiple untested play types. trend of discoveries and of similar and larger size. These and 4-way dip closed structures with either fluvio- YOU GO TO NAPE. Figure 6: Atlantic margin basin floor fan play fairway model – note up-dip KARYNA RODRIGUEZ, MIKE SAUNDERS, NEIL HODGSON and LAURIE GEIGER, Spectrum Figure 4: Sergipe deepwater discoveries. can be seen extending into open acreage and blocks in deltaic or aeolian sandstone reservoirs, Aptian source closure of apron fan. the current licensing round. rock and intra formational shale seals. Also in the Early The Sergipe Basin is located offshore north-east Brazil. It Cretaceous, syn-rift unconformity truncation plays similar help to constrain the modelling of heat flow and thermal ! is divided into two sub-basins, Sergipe in the south and Basin Floor Fan Play Fairway to those associated with the successful Dentale play fairway maturation. Alagoas in the north. With an offshore area of 35,000 An extensive dataset of modern long-streamer 2D seismic in Gabon have been identified. km2 and water depths up to 3,500m, it is classified as a along both sides of the South Atlantic margin has been Aptian/Albian plays could be sourced by either Aptian Sergipe Past, Present and Future passive margin / pull-apart basin with initial Early to used to identify a regional basin floor fan play fairway with or Albian source rock and include Aptian/Barremian Evaluation of modern, high quality seismic data has led Mid-Cretaceous rift basin development, followed by a a regional distribution of source rock and kitchen areas. transgressive sands, sandstones and limestones in to the confirmation of the extension into open acreage of passive margin drift phase from the Mid-Cretaceous to At the same time, depth domain seismic profiles have stratigraphic unconformity lag or seaward dipping traps, as proven turbidite channel systems of Mid to Late Cretaceous present, resulting from the separation of South America revealed the true geometries of these basin floor fans. A well as 3-way dip closures against sea mounts or intrusive and Early Tertiary age. Using an extensive long-offset from Africa. The Alagoas Basin is dominated by a thick deepwater basin floor fan play model (Figure 6) indicates induced anticlines and fault controlled 3-way dip closures. seismic dataset spanning both sides of the Atlantic, a model syn-rift succession and an abbreviated post-rift/drift a huge trapping geometry on seismic displays corrected Late Cretaceous and younger rocks have similar traps has been put together showing basin floor fans dipping sedimentary section. The Sergipe Basin is characterised for water depth, where it becomes apparent that the basin to those mentioned above, with the Calumbi formation as landward and pinching out towards the mid-oceanic ridge. by a major extensional rift phase and the presence of a floor fans directly overlying mature Aptian source rock the reservoir and either Aptian or Albian source rocks. The In Sergipe these basin floor fans are associated with AVA fully developed post-rift sequence. are in fact dipping landward or pinching out towards the combined structural-stratigraphic landward-dipping basin anomalies similar to those of the discoveries. This play type The onshore basin is mature, having experienced mid-oceanic ridge, thereby eliminating the most dreaded floor fans are a significant untested play type with excellent is being tested by the Yakaar well offshore Senegal and is exploration activity for almost 100 years, although up-dip seal trapping risk for this type of play. amplitude and AVA seismic indicators. Figure 7 shows a dip set to become the exploration target of the future due to its prior to the 1950s it was sporadic. In the ’60s there was This geometrical relationship is observed offshore seismic line in time, displaying the (Far-Near*Far) angle huge potential. Figure 3: Play types offshore Sergipe Basin (see text page heightened drilling activity and the largest onshore Sergipe, outboard of the turbidite channel discoveries stack attribute. Yellow indicates a soft kick which brightens Integration of available seismic and potential field 42 for explanation). field, Carmopolis, was discovered at this time. Offshore, in the basin floor fan setting. Amplitude and AVA in the far angle stack (AVA anomaly). A zoomed-in panel data has resulted in a greater understanding of the main significant seismic and drilling commenced in the anomalies indicate that there could be significant of the dashed box shows a strong AVA anomaly with an elements of the petroleum system and, therefore, in the 1970s and the 110 MMboe Caioba field was discovered. hydrocarbon accumulations associated with extensive associated basin floor fan geometry. The conventional identification of multiple as yet untested play types in this Exploration on the shelf continued through the ’80s to basin floor fans to the east of the channel discoveries and seismic PSDM zoomed-in display, with water depth basin. Again, with calibrated amplitude support and with late 2000s with moderate to small discoveries. In 2010 with a separate trap provided by 3-way dip closure and corrected,! shows the true geometry of this basin floor fan. pre- to syn-rift analogies in the successful targets in the ! ! Petrobras made several significant Upper Cretaceous up-dip pinch-out to the east. conjugate Gabon margin, modern tools are available which Gravity Modelling ! to Lower Tertiary, turbidite channel system discoveries confirm that the undrilled potential offshore Sergipe easily ! in the deeper water of the Sergipe Basin. The company Proven and New Play Types An accurate interpretation of the crystalline basement surpasses the discovered resources to date. submitted eight appraisal evaluation plans to the ANP Integrating all available seismic tools, a schematic section and the Moho discontinuity was made Figure 7: Basin floor fan play with AVA anomaly on Far-Near*Far display. ! (National Agency of Petroleum) and drilling possible by the high quality PSDM ! Figure 5: Dip line (a) and strike line (b) through the Barra well.
! ! on the recent discoveries is continuing in imaging (see foldout). The interpreted ! ! ! a ! order to commercially confirm some 3+ Bboe b horizons and interval velocity models
! ! of reserves. were used to constrain modelled gravity
!
! ! profiles, from which were derived
! ! ! ! Undrilled Discovery Analogues ! ! gridded maps of the base of sediment ! ! ! ! ! ! ! ! !!! ! !! ! The Barra discovery well was drilled in (top crystalline basement) and the ! ! ! ! !! ! ! September 2010, reaching a depth of 6,510m Moho discontinuity. ! in 2,341m of water. Permeability and porosity These modelled gravity inversions 16–17 AUG 2017 | Houston, Texas conditions in the reservoir are excellent at have led to an improved interpretation ! well depths of approximately 4,650–4,750m, of the crustal geometry by augmenting
! ! ! ! where drill stem tests indicate gas and the seismic imaging, resulting in a
! ! ! !! ! From keeping tabs on your region to seeing what the world has to o er, !! condensate present in commercial quantities. clearer picture of crustal architecture
! ! ! !
! ! The gross thickness of the zone of sandstones including the amount of stretching ! NAPE has something for everyone. New this year, Summer NAPE is organizing ! encountered in the Barra well is approximately associated with rifting across the 80m and well tests indicate a high porosity/ basin (Figure 2). The beta factors Hot Play Happy Hours to gather attendees who share business in today’s active plays. ! ! low density, gas-charged reservoir. that are implied by this stretching
! ! REGISTER TO EXHIBIT & ATTEND AT www.NAPEexpo.com GEOExPro May 2017 41 42 GEOExPro May 2017 36 GEOExPro May 2017
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!!! ! ! ! ! ! ! ! !! ! ! ! WHEN LOOKING FOR OIL AND GAS, ! ! Two other discoveries in the deepwater area of this has been put together to illustrate the various play types ! !! !! ! ! !!!! ! !!
! basin include the Muriu and Farfan finds, with estimates identified in the Sergipe Basin (see Figure 3, beginning of ! ! ! ! !! ! !! !! ! ! !! ! !!!!!!! ! !! ! indicating 3 Bboip and rising due to other exploration article). Source rock, reservoir, seal and trap evaluation has !!! ! ! ! ! ! ! ! !! !! ! Barra! ! !! YOU GO TO THE MOST PROMISING SITE. ! Sergipe Basin ! successes, including the latest Poço Verde discovery been combined with amplitude and AVA anomaly analysis, ! ! ! SEAL-M-349 SEAL-M-351 Aracaju! ! ! Cumbe Brazil ! ! ! PETROBRAS!! QGEP ! ! ! ! ! !!!!! ! ! (Figure 4). These discoveries are in turbidite channel resulting in up to 14 different potential targets in pre- to !!!! ! ! ! ! !!!!!! !!! !!!! !!!!!!!!!! ! ! ! !!!!! !!!!!! ! !!!!!!!!!! ! ! ! !! ! !!!! ! !!!!!!!!!! ! ! !!! !! !!! !!! ! !! ! ! !! !!! ! !! ! ! !! ! ! ! ! ! !! !! ! ! ! !! ! !!!!!!!! ! ! ! ! !!! ! ! Farfan !!!!!!!! !!! ! SEAL-M-426 SEAL-M-428 syn-rift and post-rift sequences which have been mapped ! ! systems of Mid to Late Cretaceous and Early Tertiary ! !!!!!!! ! !!!!!!! !!! ! ! !!!!!!! !!!! !!!!!!! ! ! ! ! ! ! !!!!!!!!! ! ! ! ! !!!! ! ! ! ! ! ! !!!!! !! PETROBRAS QGEP THE SAME HOLDS TRUE ! ! ! !!! ! ! ! ! ! ! ! ! ! BM-SEAL-004A ! ! ! ! ! ! ! age. They are associated with clear amplitude anomalies and are potentially associated with hydrocarbon indicators. !!! ! ! PETROBRAS! ! ! ! ! ! !! ! !! ! ! ! Potential Revealed ! Muriu ! !! !!! SEAL-M-499 ! ! ! ! ! ! !! !! as illustrated in both dip and strike seismic sections over These play types include the proven stratigraphic seaward ! PETROBRAS ! ! !
!! !! ! ! the Barra discovery (Figure 5). dipping Late Cretaceous Calumbi Formation slope apron ! WHEN LOOKING FOR DEALS. Bonita Integration of seismic attributes and potential field data has resulted in a better Using the angle stack attribute (Far-Near*Far) it and base of slope deepwater turbidites. understanding of the main elements of the petroleum system, allowing for the Poco Verde was possible to identify multiple undrilled amplitude Many new untested play types include Early and AVA anomalies, with similar character to the Barra Cretaceous syn-rift 3-way dip closures with fault seal identification of multiple untested play types. trend of discoveries and of similar and larger size. These and 4-way dip closed structures with either fluvio- YOU GO TO NAPE. Figure 6: Atlantic margin basin floor fan play fairway model – note up-dip KARYNA RODRIGUEZ, MIKE SAUNDERS, NEIL HODGSON and LAURIE GEIGER, Spectrum Figure 4: Sergipe deepwater discoveries. can be seen extending into open acreage and blocks in deltaic or aeolian sandstone reservoirs, Aptian source closure of apron fan. the current licensing round. rock and intra formational shale seals. Also in the Early The Sergipe Basin is located offshore north-east Brazil. It Cretaceous, syn-rift unconformity truncation plays similar help to constrain the modelling of heat flow and thermal ! is divided into two sub-basins, Sergipe in the south and Basin Floor Fan Play Fairway to those associated with the successful Dentale play fairway maturation. Alagoas in the north. With an offshore area of 35,000 An extensive dataset of modern long-streamer 2D seismic in Gabon have been identified. km2 and water depths up to 3,500m, it is classified as a along both sides of the South Atlantic margin has been Aptian/Albian plays could be sourced by either Aptian Sergipe Past, Present and Future passive margin / pull-apart basin with initial Early to used to identify a regional basin floor fan play fairway with or Albian source rock and include Aptian/Barremian Evaluation of modern, high quality seismic data has led Mid-Cretaceous rift basin development, followed by a a regional distribution of source rock and kitchen areas. transgressive sands, sandstones and limestones in to the confirmation of the extension into open acreage of passive margin drift phase from the Mid-Cretaceous to At the same time, depth domain seismic profiles have stratigraphic unconformity lag or seaward dipping traps, as proven turbidite channel systems of Mid to Late Cretaceous present, resulting from the separation of South America revealed the true geometries of these basin floor fans. A well as 3-way dip closures against sea mounts or intrusive and Early Tertiary age. Using an extensive long-offset from Africa. The Alagoas Basin is dominated by a thick deepwater basin floor fan play model (Figure 6) indicates induced anticlines and fault controlled 3-way dip closures. seismic dataset spanning both sides of the Atlantic, a model syn-rift succession and an abbreviated post-rift/drift a huge trapping geometry on seismic displays corrected Late Cretaceous and younger rocks have similar traps has been put together showing basin floor fans dipping sedimentary section. The Sergipe Basin is characterised for water depth, where it becomes apparent that the basin to those mentioned above, with the Calumbi formation as landward and pinching out towards the mid-oceanic ridge. by a major extensional rift phase and the presence of a floor fans directly overlying mature Aptian source rock the reservoir and either Aptian or Albian source rocks. The In Sergipe these basin floor fans are associated with AVA fully developed post-rift sequence. are in fact dipping landward or pinching out towards the combined structural-stratigraphic landward-dipping basin anomalies similar to those of the discoveries. This play type The onshore basin is mature, having experienced mid-oceanic ridge, thereby eliminating the most dreaded floor fans are a significant untested play type with excellent is being tested by the Yakaar well offshore Senegal and is exploration activity for almost 100 years, although up-dip seal trapping risk for this type of play. amplitude and AVA seismic indicators. Figure 7 shows a dip set to become the exploration target of the future due to its prior to the 1950s it was sporadic. In the ’60s there was This geometrical relationship is observed offshore seismic line in time, displaying the (Far-Near*Far) angle huge potential. Figure 3: Play types offshore Sergipe Basin (see text page heightened drilling activity and the largest onshore Sergipe, outboard of the turbidite channel discoveries stack attribute. Yellow indicates a soft kick which brightens Integration of available seismic and potential field 42 for explanation). field, Carmopolis, was discovered at this time. Offshore, in the basin floor fan setting. Amplitude and AVA in the far angle stack (AVA anomaly). A zoomed-in panel data has resulted in a greater understanding of the main significant seismic and drilling commenced in the anomalies indicate that there could be significant of the dashed box shows a strong AVA anomaly with an elements of the petroleum system and, therefore, in the 1970s and the 110 MMboe Caioba field was discovered. hydrocarbon accumulations associated with extensive associated basin floor fan geometry. The conventional identification of multiple as yet untested play types in this Exploration on the shelf continued through the ’80s to basin floor fans to the east of the channel discoveries and seismic PSDM zoomed-in display, with water depth basin. Again, with calibrated amplitude support and with late 2000s with moderate to small discoveries. In 2010 with a separate trap provided by 3-way dip closure and corrected,! shows the true geometry of this basin floor fan. pre- to syn-rift analogies in the successful targets in the ! ! Petrobras made several significant Upper Cretaceous up-dip pinch-out to the east. conjugate Gabon margin, modern tools are available which Gravity Modelling ! to Lower Tertiary, turbidite channel system discoveries confirm that the undrilled potential offshore Sergipe easily ! in the deeper water of the Sergipe Basin. The company Proven and New Play Types An accurate interpretation of the crystalline basement surpasses the discovered resources to date. submitted eight appraisal evaluation plans to the ANP Integrating all available seismic tools, a schematic section and the Moho discontinuity was made Figure 7: Basin floor fan play with AVA anomaly on Far-Near*Far display. ! (National Agency of Petroleum) and drilling possible by the high quality PSDM ! Figure 5: Dip line (a) and strike line (b) through the Barra well.
! ! on the recent discoveries is continuing in imaging (see foldout). The interpreted ! ! ! a ! order to commercially confirm some 3+ Bboe b horizons and interval velocity models
! ! of reserves. were used to constrain modelled gravity
!
! ! profiles, from which were derived
! ! ! ! Undrilled Discovery Analogues ! ! gridded maps of the base of sediment ! ! ! ! ! ! ! ! !!! ! !! ! The Barra discovery well was drilled in (top crystalline basement) and the ! ! ! ! !! ! ! September 2010, reaching a depth of 6,510m Moho discontinuity. ! in 2,341m of water. Permeability and porosity These modelled gravity inversions 16–17 AUG 2017 | Houston, Texas conditions in the reservoir are excellent at have led to an improved interpretation ! well depths of approximately 4,650–4,750m, of the crustal geometry by augmenting
! ! ! ! where drill stem tests indicate gas and the seismic imaging, resulting in a
! ! ! !! ! From keeping tabs on your region to seeing what the world has to o er, !! condensate present in commercial quantities. clearer picture of crustal architecture
! ! ! !
! ! The gross thickness of the zone of sandstones including the amount of stretching ! NAPE has something for everyone. New this year, Summer NAPE is organizing ! encountered in the Barra well is approximately associated with rifting across the 80m and well tests indicate a high porosity/ basin (Figure 2). The beta factors Hot Play Happy Hours to gather attendees who share business in today’s active plays. ! ! low density, gas-charged reservoir. that are implied by this stretching
! ! REGISTER TO EXHIBIT & ATTEND AT www.NAPEexpo.com GEOExPro May 2017 41 42 GEOExPro May 2017 36 GEOExPro May 2017
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