川西坳陷中江斜坡大安寨段陆相页岩油气地质特征  

Geological characteristics of continental shale oil and gas in Da'anzhai Member,Zhongjiang slope,western Sichuan depression

作　　者：李强[1] 杨映涛[1] 颜学梅 王玲辉[1] 卓俊驰 Li Qiang;Yang Yingtao;Yan Xuemei;Wang Linghui;Zhuo Junchi(Exploration and Development Research Institute,Sinopec Southwest Oil&Gas Company,Chengdu,Sichuan 610041,China)

机构地区：[1]中国石化西南油气分公司勘探开发研究院,四川成都610041

出　　处：《天然气技术与经济》2020年第5期13-19,共7页Natural Gas Technology and Economy

摘　　要：近年来,中国石化西南油气分公司在川西坳陷中江斜坡侏罗系自流井组大安寨段湖相层系加大勘探力度,多口井取得了工业油气流,展示了该区该层系良好的油气勘探潜力。为了进一步明确研究区侏罗系大安寨段页岩油气资源潜力,主要以陆相页岩油气形成地质特征为研究对象,分析了川西坳陷中江斜坡侏罗系自流井组大安寨段页岩沉积背景及平面展布特征,页岩有机碳含量及平面展布、有机质类型、有机质成熟度等页岩地球化学特征,页岩储层特征,页岩含气量特征,页岩油气保存条件和页岩工程物理特征,指出了川西坳陷中江斜坡侏罗系自流井组大安寨段具有良好的页岩油气形成地质条件。研究结果表明:①研究区大安寨段优质页岩具有厚度大、平面展布广、有机碳含量较高、有机质类型及有机质成熟度较好、物性较好、脆性矿物含量高的特征;②研究区大安寨段具有埋藏深度浅、地层压力系数高的特征,具备良好的工程改造条件。结论认为,研究区东部—东南部的福兴、回龙场、永太地区为页岩油气有利目标区,具备页岩油气勘探潜力。Recently,Sinopec Southwest Oil&Gas Company has been strengthening its exploration on lacustrine Da'anzhai Member of Jurassic Ziliujing Formation,Zhongjiang slope,western Sichuan depression.And industrial oil and gas flow has been obtained from many wells,showing promising exploration potential.In order to further determine shale oil and gas resource potential in this member,its sedimentary setting and areal distribution characteristics were analyzed,including geochemical features(e.g.total organic carbon(TOC)and its areal distribution,and organic-matter type and maturity),reservoir characteristics,gas content,preservation condition,and engineering physical characteristics.Then,it was pointed out that the Da'anzhai Member in the study area has good geological condition to form shale oil and gas.Results show that(1)the high-quality shale of Da'anzhai Member has some characteristics of great thickness,extensively areal distribution,higher TOC,and better organic-matter type and maturity,better physical property,and higher content of brittle mineral;and(2)this member is characterized by shallow burial depth and high formation pressure coefficient available for stimulation.In conclusion,Fuxing,Huilongchang,and Yongtai regions in the eastern to southeastern study area are the favorable target ones of shale oil and gas.

关 键 词：四川盆地 川西坳陷 中江斜坡 侏罗系 大安寨段 页岩油气 有机碳含量 

分 类 号：P618.13[天文地球—矿床学]