济阳坳陷预探井失利地质原因分析

对济阳坳陷1996~2002年期间失利的174口预探井的分析表明,对油气运移、圈闭封堵、储集性能、油气充满度、盖层以及源岩这6种地质条件的认识不足导致了钻探失利。根据含油层系、构造带和圈闭类型等不同石油地质条件,研究了各种导致探井失利的地质因素的分布特点,分析了济阳坳陷圈闭地质风险的成因及主控因素。结果表明,油气有效运移通道、二次运移动力和油气充满度应是当前基础理论研究的重点。

Geologic Reasons for Unsuccessful preliminary prospected wells in Jiyang Depression

Analysis on 174 unsuccessful preliminary prospected wells drilled from 1996 to 2002 shows that insufficient understanding of geologic conditions such as oil-gas migration, seal of trap, reservoir property, oil-gas filling degree, cap rock and source rock may lead to unsuccessful drilling. The geological factors that cause unsuccessful drilling in different oil-bearing formations, different structural belts and different trap types are classified. The origin and control factors for geologic risk of oil-bearing trap in Jiyang Depression were defined. It is pointed out that the effective migration passage, secondary migration force and oil-gas filling degree are the most important basic theories to be studied at present.