摘要
应用Bower法对不同超压成因的地层压力进行预测,通过对黄河口地区单井地层压力纵向和平面展布特征分析认为,区内中深层普遍存在超压现象,在纵向上超压一般在2600m左右开始出现;在平面上,始新统沙河街组三段超压现象分布最为广泛。利用速度-垂直有效应力及密度-垂直有效应力交会图对超压成因进行识别认为,黄河口地区东营组超压成因机制主要为欠压实和生烃作用,以欠压实为主;沙河街组超压成因机制以生烃作用为主,但随着埋藏深度的增加,沉积速率相对于浅部加大,其超压成因机制常为多种因素的叠加。
Formation pressure of different overpressure geneses was predicted with Bower method.By analyzing the vertical and planar distributive characteristics of the single well formation pressure in the research region,it was considered that the overpressure existed widely in mid-depth formation in the Huanghekou Region,and vertically the overpressure appeared usually at about 2600m;On the plane,it was widely distributed in Es3 of Eocene of Huanghekou Depression.It is distinguished by using the cross plot of velocity-vertical effective stress and density-vertical effective stress,it is considered that the overpressure genetic mechanism in Dongying Formation of Huanghekou Region is mainly of undercompaction and hydrocarbon genesis and undercompaction is dominant.The overpressure genetic mechanism in Shahejie Formation is mainly of hydrocarbon genesis,with the increase of buried depth,the deposition velocity increases compared with shallow formation,its overpressure mechanism is mostly the overlay of multiple factors.
出处
《石油天然气学报》
CAS
CSCD
2014年第7期8-11,3,共4页
Journal of Oil and Gas Technology
基金
国家科技重大专项(2008ZX05023-001-004-001)
国家重点基础研究发展计划("973"计划)项目(2014CB239104)
关键词
黄河口地区
中深层
超压成因
分布规律
Huanghekou Region
at mid-depth formation
overpressure genesis
distribution rule
