中下扬子区海相中——古生界烃源岩评价与潜力分析  

Evaluation and potential analysis on source rocks in Mesozoic and Paleozoic marine sequence,middle-lower Yangtze area.

作　　者：高林[1,2] 周雁[3] 

机构地区：[1]成都理工大学资源与能源学院,四川成都610059 [2]中国石化勘探南方分公司,四川成都610041 [3]中国石化石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2009年第3期30-33,114,共4页Petroleum Geology and Recovery Efficiency

摘　　要：依据新建立的有效烃源岩评价标准,对中下扬子区中—古生界的烃源岩进行了评价,分析了烃源岩的分布层位和岩性,详细论述了各层位烃源岩的特点,提出了烃源岩分布的有利层位和有利区块。中下扬子区震旦系—三叠系可划分为上震旦统陡山沱组、下寒武统、上奥陶统顶部五峰组—下志留统底部、下二叠统、上二叠统和下三叠统共6套主力烃源岩。其中下寒武统、上奥陶统顶部五峰组—下志留统底部和下二叠统烃源岩在中、下扬子区都有分布,面积广泛,为区域性主力烃源岩;上震旦统陡山沱组烃源岩在局部发育,上二叠统和下三叠统烃源岩在下扬子区分布,这3套烃源岩属地区性主力烃源岩。中扬子区下志留统、下三叠统烃源层生烃量以石柱—万县复向斜最大,利川复向斜的生烃强度最高。上震旦统—奥陶系烃源层以宜都—鹤峰复背斜的生烃量最大,花果坪复向斜的生烃强度最高。下扬子区烃源岩的二次生烃作用明显,白垩纪—新近纪部分层系仍然是有效烃源岩。The evaluation criterions of effective source rocks were established and discussed.According to the criterions,the Mesozoic and Paleozoic source rocks in middle-lower Yangtze area were evaluated,the distributional sequence and lithology of the source rocks were analyzed,the features of the source rocks in each horizon were discussed in detail,and the advantage sequences and areas of the source rocks were presented.There are six main source rocks from Sinian to Trias in middle-lower Yangtze area,they are Z_2ds,∈_1,O_3 -S_1,P_1,P_2 and T_1.The distribution of∈_1,O_3-S,and P,source rocks are universal in middle-lower Yangtze area,which are regional main source rocks.The distribution of Z_2 ds source rocks is limited.P_2 and T_1 source rocks distributed in lower Yangtze area.The distribution of latter three source rocks is limited,which are called district main source rocks.From O_3-S,to T_1 source rocks in middle Yangtze area,Shizhu-Wanxian synclinorium has the largest hydrocarbon-generation amounts.There is the highest hydrocarbon-generation intensity in Lichuan synclinorium.From upper Sinian to Ordovician source rocks,Yidu-Hefeng anticlinorium has the largest hydrocarbon-generation amounts and Huaguoping synclinorium has the highest hydrocarbon-generation intensity.The secondary hydrocarbon generation is obvious in lower Yangtze area.Some sequences of Cretaceous and Tertiary are also effective source rocks.

关 键 词：烃源岩 海相地层 中生界 古生界 油气资源 扬子区 

分 类 号：TE112.115[石油与天然气工程—油气勘探]