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Petroleum Resources Assessment 1 RN23 KR-95(C)-24 #%#o"#(KIGAM Research Report) 5 # Petroleum Resources Assessment ( I ) fix E 5 Korea Institute of Geology, Mining & Material ilSTfUBUTWH If IMS DOCUMENT IS WIMIS FiHta ms mania V KR-95(C)-24 (KIGAM Research Report) W. ffi % (I ) Petroleum Resources Assessment ( I ) Iff fsef Korea Institute of Geology, Mining & Material DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. 4 wmw, m ##% ##&, ^c#, ##c, ggm, ...............................###, *#;#, .......................................... im± &### #SS 23^^) ##K ...............................mmm, Mkm, ncm, ^?n .............. 183 Petroleum Resource's Assessment of the Okinawa Trough -3- i) mwm, ##m, g#&, #jR^, ^c#, g#a, 2) ###, ##&, *m#, #?# Petroleum Resources Assessment of the Okinawa Trough n J.H. Oh, Y.H. Kwak, P.Y. Bong, J.D. Son, T.J. Cheong, H.Y. Lee, B.J. Ryu, B.K. Son, I.G. Hwang, Y.I. Kwon, Y.J. Lee, H.J. Kim, S.S. Yi 2)K.S. Park, K.P. Park, C.S. Shin, D. Sunwoo ABSTRACT The hydrocarbon potential has been evaluated for the Tertiary strata in the northwestern margin of the Okinawa Trough on the basis of the paleontological, petrological, geochemical data from two wells (Nikkan 8-1X and JDZ VII-3), and geophysical data. Abundant marine microfossils such as foraminifers, calcareous z nannofossils and dinocysts were yielded in the sedimentary section of the above wells. Abundant palynomorphs originated from nearby onshore are also encountered. Based on nannofossiles, the biostratigraphic zones from NN12 (Amaurolithus tricorniculatus Zone) to NN19 (P seudoemiliania lacunosa Zone) are established. Four foraminiferal zones and four palynomorph assemblages were identified, which can be corresponded to 2) -Nf- Sb) 34 m -5- calcareous nannofossil zones. They reveal that the sedimentary strata had been formed in a inner (including a short period of near-coast environment in Latest Miocene) to outer neritic environment during the Late Miocene to Pleistocene age. The sedimentary sequences are divided by local unconformity into Lower and Upper Groups, the ages of which are Late Miocene and Pliocene to Pleistocene, respectively. The former is underlain by pre-Tertiary basement rocks and comprises reddish mudrocks and pebbly sandstones of nonmarine origin, and dark grey mudrocks and whitish sandstones of marine origin. The latter is mainly composed of semiconsolidated or unconsolidated sands and muds of marine origin, and is subdivided into Lower (Early Pliocene), Middle (Late Pliocene), and Upper (Pleistocene) Formations in a ascending order. The Upper Group in the JDZ VII-3 well area (block) is about 6 km in thickness >2 times of the Nikkan's equivalent. These differences in thickness between two wells (blocks) are interpreted to be caused by differential subsidence of each block occurred during the formation of the Okinawa Trough. The Lower and Middle Formations have potential sandstone reservoirs although these beds show limited extension due to lateral facies changes. The above potential reservoir rocks consist of quartz arenite, about 50m thick, and show good porosity varying from 18% to 30% and high permeability. According to the geochemical analysis results, it is hard to expect a source rock that can generate enough hydrocarbons necessary for migration in the drilled intervals. The organic matter content is extremely low in the Nikkan 8-1X (less than 0.3% in whole section). The content is 0.4%-0.5% in the JDZ VII-3 well. The organic matter seems to be compared to Type III. Even though the thermal maturity reached the oil generation zone in the penetrated intervals, the calculation by the program GENEX of BEICIP shows that the amount of the generated hydrocarbons —6—' is not enough for the migration. A good source rock may be expected in the depth deeper than 4300m horizon. Analysis of over 3300 Line-km of multichannel seismic data integrated « * with 2 well data serves to detail the structural and stratigraphic evolution of the western margin of the Okinawa Trough, offshore southern part of Korea peninsula. The overall tectonic style is characterized by a series of half-grabens and tilted fault blocks bounded by listric faults. Most half-grabens and tilted fault .blocks developed in the direction of NNE-SSW, which coincides with the axis of the Okinawa Trough. Mapping of listric faults strongly suggests the existence of transfer faults developed in NW-SE direction, which intersect normal faulted areas. Tectonics of the rifting phase have been established on the basis of structural and stratigraphic analyses of depositional sequences and their seismic expressions. The rifting probably began in the late Miocene and has continued until early Pleistocene. The large rifting activity resulting in tilting fault blocks occurred from late Miocene to early Pliocene. In contrast, it seems that the rifting activity was weaker during late Pliocene and early Pleistocene. The potential hydrocarbon traps associated with titled fault block, fault and rollover structure exist. —7 — B % mi# ................................................................... ii #2# is #3# #4# 20 mm me##.................................................................................................................... 21 S2B Nikkan 8-1X JL ............................................................................................... 22 2-1. W^LsIHblEi........................................................................................................ 22 2-2. fiMM mmtfi.............................................................................................. 24 2-3. 29 2- 4. j? me ................................................................................................ 32 msm JDZ Vn-3 ?L.................................................................................................... 34 3- 1. W'FLS'fbS' ........................................................................................................ 34 3-2. @%<b5................................................................................................... 37 3-3. Tm.miHbs ..................................................................................................... 4i 3-4. me ..................................................................................................... 44 m4# #^ ^ mm............................................................................................................... ?s mm #^......................................................................................................................... 78 1-1. #5##........................................................................................................... 78 1-2. ............................................................................................................... 83 1- 3. me........................................................................................................... ss m 2# mm.................................................................................................................. si 2- i. tu mm###.................................................................................................. 91 2-2. mm##....................................................................................................... 91 mss e@# ff®........................................................................................................... 95 mi® #s#% 95 1-1. ##4 95 1-2. ##4 mm.......................................................................................................... ss 1-3. ##^ 96 1-4. mj&?m................................ 101 mss mm# .................................................................................................................. 122 mis es u ems....................................................................................... 122 m2# 134 S3B sm&m m&jj.............................................................................................1.34 mm ### 135 —9 — 2.#^ 137 137 5-2. ........................... 143 5-3. %##aj g bM^ 143 5-4. 2.#^ 3&B..................... 144 mat m###................. 148 mi# mm ^ ..... 148 l-l. ............................... 148 1-2 9* @@ 148 1- 3 a§&4] #####% m%......................................................................... 153 S2® jW$T ...............* ..................................................................................... 154 2-1 tikMMjii ................................. •’....................................................................... 154 2-2 MJ¥ ............................................................................................................. 163 S3® 5# m# W##..........................................................................................172 S8S ................................................................................................................. 175 ............................................................................................................................178 —10— IS if w #4444f5ir 1992444 2001444 44453. 49 4 4#^.oj] « 3.-6}^ S|4 44S] 4 444 ^7> 44 i: ^SSS].37 ^.O 4, 4*} £ £ 44 6_ 5- 4^^# 5444E-45i cH# 39 . 441- d] S-JIA^O]] ^44^4. -2.7144—4-5-fe 44"5" 44 ^"#4 #5 4 (Korea Japan Joint Development Zone; JDZ)4 4 354, 554 4 654# 5.444 (Table 1-1). Table 1-1. Drilling Information on the Exploratory Wells, JDZ VII-3 and Nikkan 8-1X. JDZ vn-3 Nikkan 8-1X Okinawa Trough Okinawa Trough Location Subzone 6 Subzone 6 Geographical Location 29° 46' 55" N 29° 25'
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