摘要
异常高压对油气运移和聚集具有建设与破坏的双重作用 :发育异常高压的泥岩可作为良好的盖层 ,尤其是作为良好的区域性盖层 ,有利于油气成藏 ;异常高压可以成为泥岩排水、排烃的动力 ,产生的裂缝既可作为良好的油气运移通道 ,也可能导致油气盖层的破坏 ,促使油气重新分布。辽河坳陷西部凹陷滩海地区Es1+ 2 发育异常高压 ,泥岩的分布及厚度在一定程度上决定了异常压力发育状况 ,且泥岩中的超压往往高于邻近砂岩的超压 ,其压力差成为排烃动力 ,使生烃中心的流体以“离心式”向外排出 ,形成的油气富集带围绕生烃中心呈环带状分布。剩余压力及压力系数的分布基本指示了研究区地下流体的流向 ,反映了西部斜坡带、笔架岭构造带及中央低凸起是有利的含油气区带。异常高压有效地增加了Es1+ 2 作为区域性盖层的封闭能力 ,基本控制了西部凹陷的油气聚集成藏。图 4表 1参
The implications of abnormal high-pressure for hydrocarbon migration and accumulation lie in two opposite aspects. On one hand, the formation with abnormal high-pressure can act as a seal, especially as a regional seal, being the key factor to hydrocarbon accumulations. On the other hand, abnormal high-pressure provides water and hydrocarbon expulsion with original power. And the formed cracks or fractures also can be favorable migrating channels of oil and gas. But the seal may be destroyed and result in re-distribution of oil and gas below the seal or mudstone. By studying the abnormal pressure of Es l+2 formation in west sag of Tanhai area of Liaohe depression, the authors succeeded in explaining how abnormal high-pressure affect and control hydrocarbon migration and accumulation. Furthermore, the relationship between abnormal high-pressure and petroleum migration, accumulation and distribution was discussed.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2003年第1期35-37,共3页
Petroleum Exploration and Development
基金
国家 973项目"中新生代陆内造山过程"( 2 0 0 1CB40 984)
关键词
辽河西部凹陷
滩海地区
Es1+2
特征
油气运聚
异常高压
油气运聚
油气分布
勘探目标
abnormal high-pressure
hydrocarbon migration and accumulation
oil and gas distribution
exploration target
Liaohe depression
Tanhai area
