深埋藏砂岩储层中异常孔隙的保存机制探讨  

Preservation Mechanisms of Abnormal Porosity in Deeply Buried Sandstone Reservoirs

作　　者：肖军[1] 王华[1] 袁立川[2] 姜华[1] 陈少平[1] 

机构地区：[1]中国地质大学资源学院,武汉430074 [2]中国石油天然气股份有限公司东方地球物理公司研究院乌鲁木齐分院,乌鲁木齐830016

出　　处：《地质科技情报》2007年第5期49-56,共8页Geological Science and Technology Information

基　　金：国家"十五"重大科技攻关项目(2004BA616A);中国地质大学(武汉)2005年度优秀青年教师资助计划项目(CUGQNL0511)

摘　　要：通常情况下,砂岩储层的孔隙度和渗透率随埋深的增大而减小,但越来越多的地质实践表明深埋藏(>3500 m)的砂岩储层在一些特定情况下可以保持异常高的孔隙度和渗透率。有多种成因机制可以使其孔隙在深埋藏条件下得以保存,主要包括:①早期烃类的充注;②颗粒包层和(或)颗粒环边的存在;③流体超压的存在;④次生孔隙的发育。在综合国内外大量相关文献的基础上,对这些成因机制进行了深入的探讨,并给出了相应的实例。这些研究将为油田的储层评价、储量预测等勘探开发工作提供进一步的决策依据。Porosity and permeability generally decrease with increasing depth. However, more and more geological practices show that a significant number of deeply （〉3 500 m） buried sandstone reservoirs worldwide are characterized by anomalously high porosity and permeability with some special conditions. Some geologists have identified several preservation mechanisms, which can cause the abnormal porosity in subsurface sandstone reservoirs. There are four major mechanisms, including：①early hydrocarbon emplacement, ② rain coats and/or grain rims, ③ shallow development of fluid overpressure, and ④ development of secondary porosity. Based on lots of correlative literature reading and synthesizing, this paper gives profound discussions and some corresponding examples for these preservation mechanisms. It is believed that all above studies will be important for further decision-making on reservoir assessment and potential reserves prediction for oilfields.

关 键 词：深埋藏 砂岩储层 异常孔隙 保存机制 

分 类 号：TE122.2[石油与天然气工程—油气勘探]