HYDROCARBON GENERATION CONDITIONS AND SEDIMENTARY MODEL OF ORGANIC-RICH SHALE FROM CHANG 7 MEMBER OF YANCHANG FROMATION IN SOUTHERN ORDOS BASIN
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摘要:
针对鄂尔多斯盆地南部延长组长7段富有机质泥页岩岩石学特征及生烃潜力认识不清的问题, 通过对研究区泥页岩的岩石学、矿物组成、有机地球化学、孔隙类型及沉积模式精细研究, 结果表明: 研究区主要存在3种不同类型的泥页岩, 分别是泥质碎屑流成因的块状泥岩、浊流成因的正粒序泥岩及沉积于静水环境中的纹层状泥岩. 块状泥岩和正粒序泥岩含有较多的陆源碎屑矿物, 纹层状泥岩碳酸盐矿物含量高, 同时含有较高的有机碳及可溶烃和热解烃, 它们的干酪根类型以Ⅱ型为主, 含有少量Ⅰ型. 泥页岩储集空间主要为粒间孔、粒内孔及微裂缝, 有机质孔少见, 纹层状泥岩孔隙类型多样, 储集空间大. 泥质碎屑流形成的块状泥岩沉积在湖盆坡脚处, 浊流成因的正粒序泥岩及纹层状泥岩广泛沉积于湖盆中心, 且厚度大.
Abstract:The study on petrology, mineral composition, organic geochemistry, pore types and sedimentary model of shale from Chang 7 Member of Yanchang Formation in southern Ordos Basin shows that there are three types of mud shale in the area, including massive mudstone of muddy debris flow origin, normal-graded mudstone formed by turbidity current, and laminated mudstone deposited in lentic environment. The former two contain numerous terrigenous clastic minerals, while the latter has high content of carbonate minerals as well as high organic carbon and soluble and pyrolysed hydrocarbon. The kerogens of the mud shale are dominated by type II with minus of type I. The reservoir space of shale is mainly intergranular pore, intragranular pore and microfracture, with rare organic pore. The laminated mudstones are characterized by various pore types and large reservoir space. The massive mudstones formed by muddy debris flow are deposited at the slope toe of lake basin, while the normal-graded mudstone of turbidity current origin and laminated mudstone are widely deposited in the center of lake basin with large thickness.
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