新疆石油地质

›› 2013, Vol. 34 ›› Issue (1): 1-1.

• 论文 •    

鄂尔多斯盆地西部延长组下组合异常压力与油气分布

范玉海1，2，屈红军2，王 辉1，2，冯杨伟2，李 敏2，郑艳荣2   

  1. (1. 中国煤炭地质总局 航测遥感局遥感应用研究院,西安 710054;2. 西北大学 大陆动力学国家重点实验室,西安 710069)
  • 出版日期:2019-01-01 发布日期:1905-07-09

Abnormal Pressure of Lower Assemblage of Yanchang Formation and Its Hydrocarbon Distribution in Western Ordos Basin

FAN Yuhai1,2, QU Hongjun2, WANG Hui1,2, FENG Yangwei 2, LI Min2, ZHENG Yanrong2   

  1. (1. Remote Sensing Application Institute, ARSC, Xian, Shaanxi 710054, China; 2. State Key Laboratory of Continental Dynamics, Northwest University, Xian, Shaanxi 710069, China)
  • Online:2019-01-01 Published:1905-07-09

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摘要： 利用声波时差等资料,通过平衡深度法,对鄂尔多斯盆地西部151口探井的延长组下组合异常压力分布规律进行分析，综合探讨该地区异常压力与已发现油藏的分布特征及其油气运移聚集的相互关系。研究发现，研究区长7和长8油层组均有异常压力，长7油层组较下部长8油层组普遍高出8~12 MPa的异常压力，二者之间较高的异常压力差是油气向下运移的主要动力。在长8和长7油层组异常压力差低值背景下，该区已发现的大多数油藏分布在异常压力差高值区。

Abstract: 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 pressureof 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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