川西拗陷须家河组第三段烃源岩再认识及勘探潜力评价  

Recognition and exploration potential evaluation of source rocks of the third member of Xujiahe Formation in western Sichuan Depression

作　　者：王玲辉[1,2] 叶素娟[1,2] 杨映涛 赵迪[1,2] 张玲 南红丽[1,2] WANG Linghui;YE Sujuan;YANG Yingtao;ZHAO Di;ZHANG Ling;NAN Hongli(Exploration and Development Research Institute,Southwest Branch of SINOPEC,Chengdu 610041,China;Southwest Oil and Gas Branch Geology Center Laboratory,Chengdu 610041,China)

机构地区：[1]中国石油化工股份有限公司西南分公司勘探开发研究院,成都610041 [2]西南油气分公司地质中心实验室,成都610041

出　　处：《成都理工大学学报（自然科学版）》2022年第6期709-718,共10页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技重大专项(2016ZX05002-004)。

摘　　要：探讨川西拗陷上三叠统须家河组第三段(须三段)优质烃源岩分布特征及生烃潜力,为勘探提供依据。根据饱和烃色谱-质谱、干酪根显微组分、有机碳含量、镜质体反射率等分析,对须三段的成烃环境,有机质的类型、丰度和热演化程度,碳质泥岩和煤的厚度特征等进行综合研究。结果表明:有机质类型主要为Ⅲ型,局部存在混合Ⅱ2型;有机质丰度高,镜质体反射率为1.6%~2.0%,处于成熟-高成熟演化阶段;Pr/Ph<1,为盐度较高、水体较深的还原环境,生烃潜力大。基于源储配置关系,认为勘探潜力较好的目标区有:鸭子河地区和梓潼凹陷西北部须三段上亚段,大邑、崇州、洛带地区须三段中亚段。Analytical data of saturated hydrocarbon chromatography-mass spectrometry, kerogen maceral, organic carbon content, vitrinite reflectance are used to comprehensively study the hydrocarbon environment, type, abundance and thermal evolution of organic matter, thickness characteristics of carbonaceous mudstone and coal in the third member of Xujiahe Formation(T3x~3) in western Sichuan Depression. The quality characteristics of hydrocarbon source rock distribution and hydrocarbon generation potential is discussed so as to provide a basis for hydrocarbon exploration. The results show that the type of organic matter is mainly type Ⅲ with local mixed type Ⅱ. The abundance of organic matter is high, and the vitrinite reflectance ranges from 1.6% to 2.0%, reaching to the mature-high maturation evolution stage. Pr/Ph<1 indicates a reducing environment with high salinity and deep water, and has great hydrocarbon generation potential. Based on the source-reservoir relationship analysis, it is considered that the target areas with better exploration potential are the upper submember of T3x~3 in the northwest of Zitong Sag and the middle submember of T3x~3 in Dayi, Chongzhou and Luodai areas.

关 键 词：四川盆地 须家河组 烃源岩 成烃环境 生烃潜力 勘探目标 

分 类 号：TE122.115[石油与天然气工程—油气勘探]