鄂尔多斯盆地东部奥陶系风化壳古地貌特征嬗变及地质意义

发布时间：2018-01-28 14:27

本文关键词： 鄂尔多斯盆地奥陶系风化壳岩溶储层古地貌演化　出处：《石油学报》2017年09期 　论文类型：期刊论文

【摘要】：鄂尔多斯盆地奥陶系风化壳气藏的发育与前石炭纪古地貌格局密切相关,目前主要认为发育西高东低的古地貌格局,自西向东依次发育岩溶高地、岩溶斜坡及岩溶盆地的古地貌单元。但随着勘探的深入,在盆地东部地区奥陶系早期认为的岩溶盆地区已经发现了大量代表了较强岩溶作用的岩溶角砾岩等地质现象,因此有必要从古地貌动态演化角度重新认识影响岩溶古地貌发育的内外因素,研究地质历史中奥陶系风化壳古地貌的性质嬗变,指导对区域储集空间发育规律的进一步研究与预测。以盆地东部奥陶系顶部风化壳古地貌恢复为目的,综合研究了古地理背景、残留地层厚度、古岩溶特征等因素。认为早期在盆地中东部存在一个大范围的岩溶古高地,形成了岩溶型储集空间,但后期盆地东部逐渐演变为古岩溶盆地,形成了现今的前石炭纪古地貌格局,并造成早期形成的溶蚀类储集空间被大量充填,整体储层较致密,但由于溶洞塌陷形成的裂缝网络沟通了白云岩晶间孔储集空间,局部仍然可以保留有较好的储层,是值得重视的勘探目标。
[Abstract]:The development of Ordovician weathering crust gas reservoir in Ordos Basin is closely related to the Paleogeomorphic pattern of the Preco Carboniferous. Paleogeomorphic units of karst slopes and karst basins. In the early Ordovician karst basin area in the eastern part of the basin, a large number of karst breccia, which represent strong karstification, have been discovered. Therefore, it is necessary to re-understand the internal and external factors that affect the development of karst paleogeomorphology from the perspective of the dynamic evolution of paleogeomorphology, and to study the evolution of the nature of the ancient geomorphology of the Ordovician weathering crust in. For the purpose of restoring paleogeomorphology of the top weathering crust of the Ordovician in the eastern part of the basin, the paleogeographic background and the thickness of the residual strata are comprehensively studied. It is believed that there was a large area of karst ancient highlands in the middle and eastern part of the basin in the early period, which formed karst reservoir space, but the eastern part of the basin gradually evolved into the paleokarst basin. The present Paleogeomorphological pattern of the Preco Carboniferous has been formed, and the dissolution reservoir space formed in the early stage has been filled in large quantities, and the whole reservoir is relatively compact. But because the fracture network formed by cave collapse communicates the intergranular pore storage space of dolomite and local reservoir can still be retained it is a worthy exploration target to pay attention to.
【作者单位】：低渗透油气田勘探开发国家工程实验室;中国石油长庆油田公司勘探开发研究院;成都理工大学沉积地质研究院;长江大学;
【基金】：国家重大科技专项(2016ZX05004-006,2016ZX05050)资助
【分类号】：P618.13
【正文快照】： 引用:魏新善,任军峰,赵俊兴,张道锋,罗顺社,魏柳斌,陈娟萍.鄂尔多斯盆地东部奥陶系风化壳古地貌特征嬗变及地质意义[J].石油学报,2017,38(9):999-1009.Cite:WEI Xinshan,REN Junfeng,ZHAO Junxing,ZHANG Daofeng,LUO Shunshe,WEI Liubin,CHEN Juanping.Paleo-geomor-phologic

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