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川西侏罗系致密砂岩气藏裂缝特征

石油实验地质

1999年 21卷第1期

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Title

UNLOADING FRACTURE——AN IMPORTANT TYPE OF FRACTURES IN THE JURASSIC TIGHT SANDSTONE, WESTERN SICHUAN BASIN

作者

曹伟

Authors

Cao Wei

单位

西南石油地质局勘探开发研究院, 成都 610081

Organization

Southwest Bureau of Petroleum Geology, CNSPC, Chengdu 610081

摘要

川西侏罗系致密砂岩储层中,存在局部构造、卸载、层理及溶蚀等数种裂缝类型,而由地史过程中的隆升卸载作用形成的古卸载裂缝是主导裂缝,也是油气富集、成藏及产出过程中的主要渗滤通道.

Abstract

A number of comprehensive study data of cores,structures,inclusions,well testing performance and fracture pressure gradient have shown that there are several fracture types in the Jurassic tight sandstone reserviors of western Sichuan basin,such as local structures,subtraction (load relieving),stratification and corrosion etc.The leading origin type of fracture is the paleo subtractive one formed by uplifting subtraction during geohistorical process,which is the main percolation passage in the process of oil/gas concentration,reservoiring and production.

关键词：

裂缝特征; 成因类型; 古卸载裂缝;

Keywords:

fracture characteristics; genetic types; unloading fracture;

基金项目

本文是国家重点科技攻关项目(编号:85-102-07-02)部分成果

DOI

https://doi.org/10.11781/sysydz199901012