陆相断陷盆地陡坡深陷区页岩岩相特征与分布规律

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中图分类号：TQ028 文献标志码：A

Abstract：Theshaleinthesteepslopeanddeepzoneofcontinentalfaultedbasinsischaracterizedbylargethickness，multiplelithofacies types，andomplexverticalandhorizontalvariations.Atpresent，theunderstandingofshalelithofaciesdistributioninthesezones islimited，wichrestrictsshaleoiltarget-areaandlayerselectionaswellasexplorationdeployent.Using thin-section identification，whole-rock mineral X -ray diffraction，total organic carbon analysis，well-log interpretation， andseismic waveformanalysis，asystematicstudywascarredoutonthelithofaciescharacteristicsanddistributionpaternsof shale in the Upper Sub-member of the Fourth Member of Shahejie Formation（ （E2s4cs ）in the Minfeng Sub-sag，located in the steep-slope and deep zones ofthe Dongying Sag.Theresults show that fourshale lithofacies are most developed in the E2s4cs （20 ofthe Minfeng Sub-sag：organic-richlaminatedcarbonateshale，organic-richlaminatedcarbonate-mixedshale，organic-rich laminatedclay-mixed shale，andorganic-rich laminated felsic-mixed shale.The thicknesscenterof the MinfengSub-sagis dominatedbyorganic-richlaminatedfelsic-mixedshale，whilethelow-upliftareaonthesouthernmarginmainlydevelopsorganic-richlaminatedcarbonateshale；thetransitional zoneisdominatedbyorganic-richlaminatedcarbonate-mixedshaleand clay-mixedshale.Fromthenorthernsourceareatothesouthernmarginof the Minfeng Sub-sag，fourlithofaciescombinations aredevelopedsuccessively，forminganiegularast-west-trendingstripdistrbutioninplaneview.Verticaly，fromthebot tom to the top of the E2s4cs shale interval，the distribution of felsic-mixed shale gradually expands across the subsidence center and is not influenced by the overall retrogradation of the glutenite body.

Keywords faulted basin；steep slopeanddeepsubsidencearea；shale lithofacies；lithofacies combination；distributionregularity；Minfeng Sub-sag

中国东部新生代断陷湖盆是重要的含油气盆地类型，在古近系普遍发育富有机质页岩，厚度大、分布范围广，且普遍处于生油高峰阶段，富含丰富的页岩油资源[1-4]。（剩余19700字）