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8～12MPa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。
The data of acoustic travel time from 151 prospecting wells in the lower assemblage of Yanchang fl）rmation 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 hydro- carbon migration downward. Under such a pressure difference setting, most of hydrocarbon reservoirs have been discovered in the areas with high abnormal pressure difference.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2013年第1期14-16,共3页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2008ZX05025-006)
国家重点基础研究发展规划"973"项目(2009CB219400)
关键词
鄂尔多斯盆地
延长组
异常压力
油气运移
油气聚集
Ordos basin
Yanchang formation
abnormal pressure
hydrocarbon migration
hydrocarbon accumulation
