川西侏罗系致密砂岩气藏裂缝特征  

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

作　　者：曹伟 

机构地区：[1]西南石油地质局勘探开发研究院

出　　处：《石油实验地质》1999年第1期12-17,共6页Petroleum Geology & Experiment

基　　金：国家重点科技攻关项目

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。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 砂岩油气田 气藏 

分 类 号：P618.130.2[天文地球—矿床学] P618.130.1[天文地球—地质学]