Abnormal Pressure of Lower Assemblage of Yanchang Formation and Its Hydrocarbon Distribution in Western Ordos Basin
详细信息
- 责任者：Fan Yuhai (Remote Sensing Application Institute ; ARSC ; Xi’an 710054 ; China) ; Qu Hongjun
- 刊名：Xinjiang Petroleum Geology
- 出版年：2013
- 卷期：34(1)
- 关键词：超压 ; overpressure ; 油气勘探 ; petroleum exploration ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.14-16
- 图表：illus., 14 refs.
- 分类号：1003
- issnNo：ISSN1001-3873
- isbnNo：CN65-1107/TE
摘要
The data of acoustic travel time from 151 prospecting wells in the lower assemblage of Yanchang formation in western Ordos basin are used to analyze the abnormal pressure distribution in it by equilibrium depth method in order to comprehensively discuss the relationship between the abnormal pressure and the reservoir distribution as well as its hydrocarbon migration and accumulation discovered in the studied area.The study shows that the abnormal pressure occurs in Chang-7 and Chang-8 oil layers in this area.The abnormal pressure of Chang-7 is generally higher than that of Chang-8 by 8~12 MPa,so the difference acts as the principal dynamic power to make the hydrocarbon migration downward.Under such a pressure difference setting,most of hydrocarbon reservoirs have been discovered in the areas with high abnormal pressure difference.
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