Characteristics and accumulation pattern of oil reservoirs in the 8<sup>th</sup>member of the Yangchang Formation in Mafang area, Ordos Basin

Shao Xiaoyan; Tian Jingchun; Fan Yongjie; Li Fengjie

doi:10.11743/ogg20150204

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Characteristics and accumulation pattern of oil reservoirs in the 8^thmember of the Yangchang Formation in Mafang area, Ordos Basin
Vol. 36, Issue 2, Pages: 203-208(2015)
Online First：08 April 2015，

Published：2015
DOI： 10.11743/ogg20150204
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DOI：

Shao Xiaoyan, Tian Jingchun, Fan Yongjie, et al. Characteristics and accumulation pattern of oil reservoirs in the 8^thmember of the Yangchang Formation in Mafang area, Ordos Basin[J]. 2015, 36(2): 203-208. DOI: 10.11743/ogg20150204. DOI：

摘要

为了研究鄂尔多斯盆地马坊地区长8油层组油藏特征及富集规律，在沉积相研究的基础上，通过地震资料的解释和构造对比等方法，对该区的断层发育特征进行了详细研究。研究认为鄂尔多斯盆地马坊地区长8油层组油藏发育于三角洲平原分流河道高孔、高渗的砂体中，分布于天环坳陷两侧的斜坡带上，东侧斜坡是油藏主要的分布区，西侧斜坡带则分布较少。马坊地区中部发育北西-南东向展布正断层，对岩性油藏进行重新调整，造成断层下盘油藏被破坏。长8段油藏富集规律可归纳为：分流河道高孔高渗砂体是油藏形成的基础，泥岩封堵形成的岩性圈闭是油藏聚集的场所，后期的断层对先期的油藏起沟通和调整作用，相向正断层形成的断背斜是油藏富集的重要的构造部位。

Abstract

Sedimentary facies study was combined with seismic data interpretation and tectonic correlation to analyze the features of faults development in the Mafang area of Ordos Basin

so as to gain a deep insight into the characteristics and accumulation pattern of oil reservoirs in the 8

member of the Yangchang Formation.The research shows that the reservoirs were developed in delta-plain distributary channel sands with high-porosity and high-permeability and distributed on the slope belts along the two flanks of the Tianhuan sag.Oil reservoirs were mainly distributed in the east flank.In contrast

fewer reservoirs occur in the west flank.However

the northwest-southeast striking normal fault developed in the central Mafang area readjusted and destroyed the reservoirs in the foot wall.The accumulation pattern of the reservoirs can be summarized as the high-porosity and high-permeability sand bodies in the distributary channels were the reservoirs

litho-logical traps bounded by mudstone provided accumulation space for oil;later faulting activities connected and adjusted the previously-formed reservoirs and faulted anticline formed by opposite normal faults was important structural locations for oil and gas to accumulate.