蘇里格桃2井區(qū)馬家溝組古巖溶儲(chǔ)層特征研究.pdf

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3、t：AstudyonthecharacteristicsofpalaeokarsticreservoirofMajiagouFormationinTao2wellarea，SuligeSpeciality：MineralogyPetrology∥lineralDepositGeologyName：(。ignature)絲幺絲墮nstructor：(signature，當(dāng)絲—秈ABSl’KAC’lTao一2wellareaislocate

4、datthesoutheastofSuligeGasFieldandliesinthenorthwestofShanbeiSlope，OrdosBasin，areaofwhichisabout700squarekilometersRecentlybreakthroughhastakenplaceinLowerPaleozoicofthestudyarea，buttheunderstandinginthepalaeokarsticrese

5、rvoirofMajiagouFormationisfarawayfromthepracticalneedofexplorationanddevelopmentBasedontheformerresearchresultsandtheanalysisofloggingdata，well1099ingdata，core，cuttingsandthinsectionsdatas，andtestingdata，aswellassomeprod

6、uctiondata，asystematicresearchwastakenonsedimentarymicrofacies，diagenesistypes，reservoirspaces，physicalpropertycharacteristics，poretextureinMa51一Ma54palaeokarsticreservoirofMajiagouFormation，Ordovician，inthestudyareaThet

7、ypeofkarsticpalaeogeomorphologywasreconstructedaccordingto“carboniferousstratumthicknessmapofTao一2wellarea”“Ma541sbottom—OrdoviciantopresidualthicknessmapofTao2wellarea”“fore—CarboniferousstratumpaleogeologicmapofTao2wel

8、larea”，aswellascombiningqualitativerecognitionmethodwithquantitativeindexesOnthebasisofallabove，thepalacokarsticreservoirwascomprehensivelyevaluatedResultsshowedthattheMa51一Ma54reservoirofMajiagouFormation，Ordovician，int

9、hestudyareaisatypicalpalaeokarsticreservoirthatcontainsflsuiteofcarbonaterockwiththin—layergypsumrock，amongwhichthemicriticmicrolitedolomite，microlite—siltydolomiteandsiltydolomitearemorewidelydistributed，whilethick—laye

10、rmicriticlimestonecanalsobefoundinsomearea；thepalaeokarsticreservoirexperienceddolomitization，compactionandpressuresolution，dissolutionandcementation，amongwhichthecapillarycondensationdolomitization，refluxpermeabilitydol

11、omitizationandsyn—sedimentaryepidiagenetic，burieddissolutionarethekeytoformhighqualityreservoir；Thereservoirischaracterizedbylowporosityandpermeabilityandamongthemaintypesofreservoirspaces，intercrystallinesolutionpores，g

12、ypsummouldpore，karstcavesorresidualholesfilledwithdissolvedpore，nonselectivesolutionpores，structuralfracturesandsolutionfracturesareconsideredastheeffectiveones；Thereservoirkarstcavesmainlybelongtohalffullfilledtype，andt