四川盆地海相地层烃源岩特征  

Source Rock Characteristics of Marine Strata,Sichuan Basin

作　　者：徐胜林[1] 陈洪德[1] 陈安清[2] 林良彪[1] 李君文[3] 杨俊斌 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室/沉积地质研究院,成都610059 [2]浙江大学水文与水资源工程研究所,杭州310058 [3]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [4]中国石油东方地球物理勘探公司,河北涿州072751

出　　处：《吉林大学学报（地球科学版）》2011年第2期343-350,358,共9页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金重点项目(40739901)

摘　　要：震旦纪至中三叠世四川盆地发育海相地层,共发育5套区域性烃源岩:上震旦统陡山沱组、下寒武统筇竹寺组、下志留统龙马溪组都发育泥质岩烃源岩,中二叠统栖霞组和上二叠统吴家坪组则为泥质岩和碳酸盐岩2种类型的烃源岩。研究发现:陡山沱组生烃中心位于重庆涪陵地区,筇竹寺组生烃中心位于成都-自贡地区,龙马溪组以万县地区和泸州-綦江地区为主要生烃中心,栖霞组具有成都-资阳、广元-仪陇、万县3个生烃中心,吴家坪组以万县-巫山地区为主要生烃中心;同时资料显示,盆地烃源岩总体热演化成熟度较高,成熟至过成熟阶段,其生烃强度主要由有机碳丰度和烃源岩厚度决定。二级层序海平面上升期有利于区域性烃源岩形成,沉积环境控制着烃源岩的岩石类型、有机质类型和有机质丰度,构造运动则影响着烃源岩发育范围和后期有机质成熟度演化。Marine strata deposited from the Sinian to the Middle Triassic in Sichuan basin which was important to oil and gas exploration.Mudstone deposited during the Doushantuo stage of Lower Sinian,the Qiongzhusi Formation of Lower Cambrian and the Longmaxi Formation of Lower Silurian.Two types of source rocks deposited within the Qixia Formation of Middle Permian and the Wujiaping Formation of Upper Permian.The distribution characteristics of each stage are studied in detail.According to this study,the main hydrocarbon generating center of Doushantuo Formation locates in the Fuling district,the main hydrocarbon generating center of Qiongzhusi Formation locates in the area from Chengdu to Zigong.There are two main hydrocarbon generating centers which are Wanxian district and Luzhou-Qijiang area during the Longmaxi Formation,three hydrocarbon generating centers during Qixia Formation,and single hydrocarbon generating centers in Wanxian-Wushan district during the Wujiaping Stage.The maturity evolution of source rocks turns to matured or over-matured stage and the hydrocarbon-generating intensity is controlled by the abundance of organic matter and thickness of source rock.The stage of TST within the second-order sequence is better to deposit regional source rock.The types of source rock,organic matter and abundance of organic matter are mainly controlled by the sediment settings,the distribution and the maturity evolution of source rock are mainly affected by the tectonic movement.

关 键 词：烃源岩展布 控制因素 海相地层 四川盆地 油气 

分 类 号：P618.13[天文地球—矿床学]