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Geologic Report for the Navarin Basin Planning Area, Bering Sea, A1 Aska

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Geologic Report for the Navarin Basin Planning Area, Bering Sea, A1 Aska OCS Report MMS 85-0045 Geologic Report for the Navarin Basin Planning Area, Bering Sea, A1 aska Ronald F. Turner Gary C. Martin Tabe 0. Flett David A. Steffy edited by Ronald F. Turner United States Department of the Interior Mineral s Management Service Alaska OCS Region Any use of trade names is for descriptive purposes only and does not constitute endorsement of these products by the Minerals Management Service. Engl ish-Metric Conversion (The following table gives the factors used to convert English units to metric units.) -- - -- - - - - -- multiply English units by to obtain metric units feet meters miles (statute) ki1 ometers acres hectares barrel s (U .S. petrol eum) 1i ters cubic meters inches centimeters pounds per gallon grams per cubic centimeter knots kilometers per hour miles per hour kilometers per hour square miles square ki1 ometers To convert from Fahrenheit (OF) to Celsius (OC), subtract 32 then divide by 1.8, - Abbreviations and Acronyms AAPG Arneri can As soci ati on of Petroleum Geol ogi sts aff. affinis (to have affinities with) APD Appl icdL ior~for Permit to Drill ARC0 Atlantic Richfield Company BHT Bottom Hole Temperature bop. before present BS R Bottom-Simulati ng Ref lector C carbon OC degrees Celsius CDP common depth point cf. confer (to be compared with) Co. Company c ommun . communication COST Continental Offshore Stratigraphic Test 0 darcy, darci es D downthrown DS T Drill Stem Test e, E early, Early E east Abbreviations and Acronyms--Continued EA Environmental Assessment ed . edi tor(s ) , edited by " F degrees Fahrenheit fig. figure ft. feet 9 gram GSA Geological Society of America H high H .Re high resol uti on HRT High Resolution Thermometer Inc. Incorporated K-Ar potassium-argon 1, L late, Late lat latitude 1ong 1ongi tude LS S Long-Spaced Sonic m, M middl e, Middl e m milli met e r- mil lion P micro MMS Minerals Management Service m.y. mil lion years N north NMFS National Marine Fisheries Service No. number OCS Outer Cont inental She1 f opal -CT opal cristobalite-tridymite P page(s) PPG pounds per gallon random vit rini te ref1ectance Repeat Formation Tester S south s second SP Spontaneous Potent i a1 SP. species (singular) SPP* species (pl ural ) SSD subsea depth St. Saint TAI thermal a1 terati on index TD total depth TOC LuLdl urgani c carbon TT I time-t emperat ure i ndex U upthrown us United States USGS United States Geol ogi cal Survey USSR Union of Soviet Socialist Republ ics var . varietas (vari ety) Abbreviations and Acronyms--Continued vol . vol ume W west W G Western Geophysical Company yr(s> year(s) Contents Page English-Metric Conversion ............................ iii Abbreviations and Acronyms ............................ iii Introduction........................................ 1 Part 1 Regional Geology 1 Geologic Framework ................................. 7 2 Introduction to Offshore Stratigraphy ............. 12 3 Biostratigraphy ................................... 13 4 Lithostratigraphy................................. 31 5 Seismic Stratigraphy .............................. 39 6 Structural Geology ................................ 59 7 Geologic History .................................. 63 Part 2 Petroleum Geology 8 Exploration History............................... 69 9 Geothermal Gradient ............................... 71 10 Organic Geochemistry . Source Rocks. and Thermal Maturity.. .............................. 77 11 Reservoir Rocks ................................... 92 12 Seals and Migration............................... 106 13 Play Concepts ..................................... 110 Part 3 Shall ow Geology. Geohazards. and Environmental Considerations 14 Snallow Geology ................................... 119 15 Geohazards ........................................ 125 16 Environmental Considerations ...................... 130 Summary and Conclusions ............................... 134 Figures Figure 1 Map showing location of Navari n Basin Planning Area . 2 2 Lease Sale 83 bid history map ....................... 3 3 General geologic map ................................ 9 4 Biostrati graphy and pal eobathymetry of the COST No . 1 well ........................................ 14 5 Comparison of biostratigraphic summaries. COST NO . 1 well ..................................... 16 -Page Seismic reflection data coverage by Western Geophysical Co. surveys........ ................... 40 Seismic sequences and horizons...................... 42 Line interpretation of Petty-Ray seismic 1ine PR 7415......................................... 44 Petty-Ray seismic line PR 710a................ ...... 45 Line interpretation of Petty-Ray seismic 1i ne PR 7411...................................... 46 Structure-contour map of horizon A................., 49 Structure-contour map of horizon B................., 51 Structure-contour map of horizon C....... ........... 53 Isopach map of seismic sequence IV.. .. 55 Structure-contour map of horizon D.... .............. 57 Major geologic features of the Mesozoic basement rock.............................................. 61 Geothermal gradient of the COST No. 1 well and temperature-re1 ated di agenetic effects.. .. 7 2 Graph showing the extrapolation of bottom hole temperatures, COST No. 1 well..................... 74 Thermal gradient for the COST No. 1 well............ 75 Modlf led van Krevelen diagram, COST No. 1 we1 1 .. 79 Total organic carbon and extractable C15+ hydrocarbons, COST No. 1 well..................... 81 Correlation of Ro and present-day TTI values, COST No. 1 well......... ............................... 84 Thermal maturity predicted by Lopati n model su~erimposedupon structure-contour map of seismic horizon C................................. 86 Thermal maturity predicted by Lopatin model superimposed upon structure-contour map of seismic horizon I).......... ....................... 87 Cross sections depicting the relationship of the sei smic horizons to thermal maturity .. 89 Ternary diagrams, COST Nu. 1 well ................... 93 Electric log facies of the late Oligocene to middle Miocene sandstone megasequence, COST No. 1 well .............................................. 94 Plot of porosity versus permeabi 1 i ty for Tertiary sandstones, COST No. 1 well.. ..................... 98 Textural stages of sandstone buri a1 di agenesi s and reduction of porosity ............................. 100 Plot of core porosity measurements versus depth, COST No. 1 well ................................... 103 Possible trap conflguratlons associated with the Mesozoic basement and the overlyi ng Terti ary basin fill........................................ 112 Possible trap configurations associated with growing basement ridge ............................ 113 Figures--Conti nued -Page 33 Possible traD conf iqurations" associated wl th shale diapir.. .......................................... 113 34 Bathymetry, physiographic features, and 1 ocations of geologic features and dredge samples ........... 121 35 Location and lithology of bottom samples, and distribution of cohesionless sand and sand waves.......................~.,,.,............... 122 36 Lease blocks identified as having active or potential submarine slides........................ 129 Plates Plate 1 Lithostratigraphy, COST No. 1 ~ell 2 Organic richness and classification of organic matter, COST No. 1 we1 1 3 Hypothetical depositional history, tectonic history, and temperature gradient Table 1 Lithology and age of dredge samples ................. 56 2 Depths and absolute ages of seismic horizons in the COST No. 1 well............................... 83 3 Random vitrinite reflectance val ues for the oil generation zone................................... 83 4 Relationship of TTI values to hydrocarbon generation ........................................ 88 lntroduc tion This report is a summary of the regional geology, petroleum potential, and environmental characteristics of the continental she1 f portion of the Navarin Basin Planning Area. The parts of the planning area encompassing continental slope and rise bathymetries were not assessed because of the paucity of seismic data. The report is based, in great part, on detailed analyses of data obtained from the ARC0 Navari n Basin COST No. 1 We1 1 , the first deep stratigraphic test in the area. This well received exhaustive treatment in OCS Report MMS 84-0031, Geological and Operational Summary, Navarin Basin COST No. 1 ~erBeringSea, A1 aska (~uriiiandcthers,~1984 ) . ~7rt-TgTman t portxns rthat report are reproduced here, an equal amount of new and reinterpreted data is included. In particular, the common- depth-poi nt (CDP) seismic ref1ection data base has been greatly expanded and improved by the inclusion of key Western Geophysical lines. Permission to use these lines, with some restrictions, was granted by Western Geophysical Company. A number of U.S. Geological Survey (USGS) studies were also used. The Navarin Basin Planning Area (figs. 1 and 2) is bounded on the north and south by the b3' and 58' latitude lines, respectively. The southern boundary extends from 174' longitude on the east to 180" longitude on the west. The northwest boundary follows the disputed international boundary between the United States and the Soviet Union (US-USSR Convention of 1867 1. This line a1 so approximates the boundary between the Navarin Basin and the Anadyr and Khatyrka Basins (fig. 3). Risked mean 1easeabl e economical ly recoverable hydrocarbon resources in the Navarin Basin as of July 1984 are estimated to be 890 million barrels
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