川南地区海相页岩气层压力差异原因分析  

Cause of Pressure Difference in Marine Shale Gas Reservoirs, Southern Sichuan Basin

作　　者：倪楷[1] 

机构地区：[1]中国石化勘探分公司,四川成都610041

出　　处：《天然气技术与经济》2016年第3期28-30,56,共4页Natural Gas Technology and Economy

基　　金：中国石油化工集团公司重大专项"川渝地区海相优质页岩气层形成主控因素及预测技术"(编号:P15074)

摘　　要：在页岩生烃史、埋藏史、现今构造和古构造分析的基础上,对川南地区海相页岩气层压力差异的原因进行了探讨。研究认为:干酪根生烃及原油裂解形成川南地区海相页岩气层最初的超压,后期构造运动的差异造成盆内和盆外超压、常压或低压的差异,盆内威远地区受加里东期古隆起的影响紧邻古隆起的区域形成常压,其他大多保持了超压,盆外后期构造变形、断裂、剥蚀较强,超压释放形成常压和低压。Some reasons why pressure difference appears in marine shale gas reservoirs, southern Sichuan Basin, are discussed on the basis of an analysis on hydrocarbon-generating history, burial history, current and paleo structures. Results show that primary overpressure was formed by both hydrocarbon generated from kerogen and oil cracking gas. Difference between later tectonic movements led to diversity among overpressure, normal pressure, and low pressure within or beyond the basin. In Weiyuan area located within the basin, normal pressure exists surrounding the Caledonian paleo- uplift; and overpressure still keeps in other areas. Beyond the basin, severe structural deformation, fracturing, and erosion during the later stages can bring about overpressure release to finally form normal pressure and low pressure.

关 键 词：页岩气 超压 成因 释放 高产 生烃 构造抬升 

分 类 号：P618.13[天文地球—矿床学]