Geochemical studies on high-efficiency hydrocarbon expulsion of Triassic lacustrine shale in the Ordos Basin, China: implications for tight and shale oil accumulation

Geochemical studies on high-efficiency hydrocarbon expulsion of Triassic lacustrine shale in the Ordos Basin, China: implications for tight and shale oil accumulation
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中国鄂尔多斯盆地三叠系湖相页岩高效排烃地球化学研究:对致密油和页岩油成藏的影响

DOI:
10.1088/1755-1315/600/1/012044
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发表时间:
2020-12
期刊:
IOP Conference Series: Earth and Environmental Science
影响因子:
--
通讯作者:
Wenzheng Zhang
Wenzheng Zhang
中科院分区:
其他
文献类型:
--
作者:
Weiwei Yang;Wenzheng Zhang

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上三叠统延长组长7段底部发育富含有机质的沉积物,可分为油页岩和黑色泥岩,鄂尔多斯盆地中生界低渗致密油源岩是鄂尔多斯盆地中生界含油气系统的主要烃源岩对沉积物进行了地质地球化学研究,通过与原油样品和泥岩抽提物的地球化学参数对比,长7页岩排烃速率高,氯仿抽提沥青“A”转化率低,特别是TOC> 10%的样品,随着TOC的增加,低产率指数和低氢指数降低;渣油沥青“A”的饱和/芳烃比低,极性组分含量高;剩余烃的碳同位素异常稳定,应注意到根据这些异常的地球化学数据进行储层评价和油源对比会产生误解。岩样计算表明,平均为70%的页岩样品的排烃率明显高于泥岩样品。长7页岩具有大的生烃量,在低渗致密储层中排烃不临界。长7富有机质岩是今后页岩油气勘探的重要领域。
Theorganic-richsedimentsdevelopedatthebottomofChang7MemberoftheUpperTriassicYanchangformation,whichcanbedividedintooilshaleandblackmudstones,aredominatesourcerocksforlowpermeabilityandtightoilreservoirsinMesozoicpetroleumsystemofOrdosBasin.Thehydrocarbonexpulsioncharacteristicsoftheorganic-richsedimentshavebeeninvestigatedbygeologyandgeochemistrydata.Bycomparisonwiththegeochemicalparametersofcrudeoilsamplesandmudstoneextracts,Chang7shalehasmanygeochemicalevidencesonhighratesofhydrocarbonexpulsion.Lowerconversionrateofchloroformextractedbitumen"A",especiallyforthesampleswithTOChigherthan10%;lowerproductivityindexesandlowerhydrogenindexesreducingwithTOCincreasing;lowerratiosofsaturates/aromaticsbuthighercontentsofpolarcomponentsforresidualbitumen"A";heavierstablecarbonisotopesofresidualhydrocarbons.Itshouldbenotedthatthesourcerockevaluationandoil-sourcecorrelationwouldbemisunderstoodbasedontheseabnormalgeochemicaldatacausedbyhigh-efficiencyhydrocarbonexpulsion.Calculationforrocksampleshaveshownthattheexpelledratesoftheshalesamplesaveraging70%aresignificantlyhigherthanthoseofthemudstonesamples.Chang7shalewithlargeamountsofhydrocarbonsgeneratedandexpellediscriticalforhydrocarbonaccumulationinlow-permeabilityandtightoilreservoirs.Also,Chang7organic-richrocksisanimportantexplorationfieldofshaleoilinthefuture.
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DOI: 10.1144/gsl.sp.1991.059.01.03
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