四川盆地及周缘震旦系陡山沱组烃源岩生烃潜力  

Hydrocarbon generation potential of source rocks of Sinian Doushantuo Formation,Sichuan Basin and its periphery

作　　者：苑保国 戴鑫 陈建平[2] 朱华 倪云燕[2] YUAN Baoguo;DAI Xin;CHEN Jianping;ZHU Hua;NI Yunyan(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610041 [2]中国石油勘探开发研究院,北京100083

出　　处：《天然气勘探与开发》2024年第2期1-10,共10页Natural Gas Exploration and Development

基　　金：中国石油重大科技专项下属课题(编号:2016E-0601);中国石油天然气集团有限公司科技项目下属课题(编号:2023YQX20112)。

摘　　要：震旦系陡山沱组作为四川盆地一套重要的烃源岩,目前研究程度还较低。虽然已知对震旦系灯影组成藏具有一定的贡献,但暂未针对性地开展生烃潜力评价研究。为此,结合多位学者的研究成果,在系统分析四川盆地及周缘地区陡山沱组烃源岩发育特征及分布的基础上,开展了陡山沱组烃源岩干酪根历史时期生油量、排油量、生气量等评价计算,并初步分析了四川盆地范围内陡山沱组烃源岩来源的天然气资源量。研究结果表明:①四川盆地内陡山沱组烃源岩总体不发育,但存在盆地西北缘、东北缘和南缘等3个烃源岩发育区;②计算四川盆地及周缘地区陡山沱组烃源岩干酪根历史时期的生油量、排油量、生气量分别为5021×10^(8)t、4519×10^(8)t、161×10^(12)m^(3),盆地外围的干酪根生油气量是盆地内的3倍;其中盆内以川西地区生油气量最大,盆缘以东南部地区生油气量最大;③四川盆地范围内上震旦统陡山沱组烃源岩来源的天然气资源量1.09×10^(12)m^(3),以原油裂解气为主,其中川西地区天然气资源量最大,其次为川东和川南地区。As an important set of source rocks in the Sichuan Basin,the Sinian Doushantuo Formation source rocks have been scarcely studied.In spite of contributing to the hydrocarbon accumulation of Dengying Formation,the source rocks have not been evaluated for hydrocarbon generation potential.Based on previous researches,and systematic analyses on the development characteristics and distribution of the Doushantuo Formation source rocks in the Sichuan Basin and its periphery,the oil generation,oil discharge,and gas generation during the evolution of kerogen were evaluated and calculated,to preliminarily estimate the natural gas resources originated from the source rocks.The results indicate that,(i)the source rocks are generally underdeveloped within the Sichuan Basin,but there exists three areas of developed source rocks at the northwest,northeast,and south edges of the basin,(ii)the calculated oil generation,oil discharge,and gas generation during the evolution of kerogen are 5021×10^(8)t,4519×10^(8)t,and 161×10^(12)m^(3),respectively;the hydrocarbon generation of kerogen in the periphery is three times that within the basin;the highest hydrocarbon generation occurs in the western region within the basin,while in the basin periphery,it is the most prominent in the southeastern area;and(iii)the gas resources originated from the Upper Sinian Doushantuo Formation source rocks in the Sichuan Basin are estimated to be 1.09×10^(12)m^(3),dominated by crude oil cracking gas;the area with the largest gas resources is the western Sichuan Basin,followed by the eastern and the southern areas.

关 键 词：四川盆地 震旦纪 陡山沱组 烃源岩 生烃潜力 天然气资源量 

分 类 号：P618.13[天文地球—矿床学]