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在现代沉积学和层序地层学理论的指导下,综合利用沉积环境标志、露头剖面、岩芯、录井、测井、地震和古生物等资料,通过层序界面的识别和划分,认为鄂尔多斯盆地东南部侏罗系划分为6个三级沉积层序更为合理。根据侏罗系旋回特征和体系域的发育情况,分析了沉积旋回的边界及演化特征和层序对侏罗系生储盖配置关系的控制作用。认为主要储层位于延安组底部的第一个长期旋回LSC2中,是位于水进体系域(TST)的河道亚相砂岩,盖层则是位于水进体系域之上的河道泛滥平原沉积的泥岩,与三叠系层序中的生油岩构成下生上储式组合,与侏罗系层序中河道间泛滥平原亚相的泥质沉积形成自生自储式组合。
Under the guidance of modern sedimentology and sequence stratigraphy theory, comprehensively utilizing the data of sedimentary environment signs, outcrop sections, cores, logging, logging, earthquakes and paleontology, through the identification and division of sequence boundaries, it is considered that Ordos Basin The Jurassic in the southeast is divided into 6 third-order sedimentary sequences more reasonable. Based on the Jurassic cycles and the development of the system tract, the boundary between the sedimentary cycles and the evolutionary characteristics and sequence control of the Jurassic system are analyzed. The main reservoirs are believed to be located in the first long-term cycle LSC2 at the bottom of the Yan’an Formation, which is a channel subfaciesite sandstone located in the TST, and the caprock is a sedimentary mudstone in river floodplains located above the water system tract , Forming the subsurface upper-upper combination with the source rocks in the Triassic sequence and forming a spontaneous self-storage combination with the muddy sediments in the subfacies of the flood plain in the Jurassic sequence.