川西地区GJC构造须四下亚段的储集特征  

RESERVOIR CHARACTERISTICS OF T_3x^4l IN GJC STRUCTURE IN WEST SICHUAN

作　　者：邓鸿斌[1] 文龙[1] 张向阳[2] 李翔[1] 宋蜀筠[1] 

机构地区：[1]中国石油西南油气田分公司勘探开发研究院 [2]中国石油西南油气田分公司重庆气矿

出　　处：《天然气工业》2005年第S1期54-56,115-8,共6页Natural Gas Industry

摘　　要：GJC构造须四下亚段油藏是目前川西地区甚至四川盆地在上三叠统所发现的惟一油藏,通过对其储集层段作铸体、电镜扫描、阴极发光、压汞等特殊分析鉴定和孔渗饱等常规分析化验,明确了须四下亚段的岩性以中粒或细粒岩屑砂岩、长石岩屑和岩屑长石砂岩为主,其次为中粒岩屑石英砂岩或长石岩屑石英砂岩;主要为一套辫状三角洲前缘河口坝沉积;孔隙以粒内溶孔和杂基内微孔为主,其次为粒间溶岩、残余粒间孔、超大溶孔及特殊的粒缘孔;孔隙结构为小孔微候;微裂缝发育,提高了GJC构造须四下亚段储层的储渗性能;须四下亚段储层是低孔低渗孔隙—裂缝性储层。The T_3x4l (lower submember of the fourth member of Xujiahe Formation, Upper Triassic) oil reservoir in GJC structure is the only one which is found in Upper Triassic in West Sichuan, even in Sichuan Basin, at present. Through reservoir’s special analyses as casting, electron microscope scanning, cathodoluminescence and mercury injection, etc., and conventional petrophysical analyses as porosity, permeability and saturation, etc., it was proved that the T_3x4l is mainly composed of the medium or fine lithic...

关 键 词：四川盆地 西 晚三叠世 空隙类型 孔隙结构 铸体 电镜扫描 毛细管压力 分析 储集特征 

分 类 号：P618.13[天文地球—矿床学]