辽河西部凹陷南段异常低压体系及其成因机制

来源期刊:中南大学学报(自然科学版)2014年第9期

论文作者:胡安文 孟元林 孙洪斌 单俊峰 刘远奇 许丞 赵紫桐

文章页码:3150 - 3158

关键词:异常低压;致密砂岩;非常规油气;西部凹陷;辽河坳陷

Key words:underpressure; tight sandstone; unconventional gas and oil; West Sag; Liaohe Depression

摘    要:首次在渤海湾盆地辽河西部凹陷南段沙河街组致密砂岩中发现异常低压。为研究异常低压体系的分布特征和成因,应用1 092口井的试油实测地层压力资料,分析异常低压体系在纵、横2个方向上的分布特征。研究结果表明:在纵向上,异常低压主要分布在沙三段,且其顶界埋深与基底埋深呈正相关;平面上,压力系数自北西向南东均呈现出“高—低—高”的趋势,异常低压主要分布在洼陷带,其原因是洼陷带发育厚层超压泥岩可以有效地保存砂岩中的异常低压。研究区异常低压体系的形成还与地层抬升剥蚀、水冷减压和轻烃扩散作用密切相关。

Abstract: The underpressure system was discovered in the tight sandstones of Shahejie Formation of southern part of Liaohe West sag, Bohai gulf basin. In order to study the distribution and forming mechanisms of the underpressure system, the distribution features of the underpressure system in space were analyzed using the pressure data from the well test of 1 092 wells. The results show that vertically and underpressure zones are mainly distributed in the third member of Shahejie Formation, and the depths of the upper boundaries of underpressure zones show positive responses to the depth of basement; horizontally and underpressure zones show an alternating “high-low-high” pattern from NW to SE. Since the thick overpressure mudstones in sags enhance the preservation potential for underpressure, underpressure zones are usually distributed within the sags. The formation of underpressure system is controlled by uplift, erosion, hydro-cooling and gas diffusion.

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