龙门山-米仓山地区下组合地表沥青特征研究  

Study on characteristics of Sinian-Silurian bitumen outcrops in the Longmenshan-Micangshan area,Southwest China

作　　者：代寒松[1] 刘树根[1] 孙玮[1] 韩克猷[2] 罗志立[1] 谢志良[1] 黄耀综[1] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室(成都理工大学),成都610059 [2]中国石油四川石油管理局,成都610051

出　　处：《成都理工大学学报（自然科学版）》2009年第6期687-696,共10页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家重点基础研究发展计划"973"项目(2005CB422106);中国石化海相前瞻性项目(PH08005)

摘　　要：通过对川西、川北龙门山-米仓山地区下组合(震旦系-志留系,本文含泥盆系)地表沥青发育及分布的研究,发现龙门山构造带下组合沥青多集中在寒武系以及泥盆系内,而米仓山地区则多集中于震旦系。龙门山北段下组合沥青热演化程度低,属典型的氧化沥青;米仓山地区下组合(震旦系灯影组)沥青热演化程度高,属典型的热裂解沥青。表明两区下组合古油藏后期分别经历了隆升氧化降解、深埋裂解+隆升暴露两个全然不同的过程。通过对天井山泥盆系沥青、寒武系沥青脉以及米仓山灯影组古油藏的详细剖析后,认为龙门山-米仓山地区下组合(尤其是灯影组)古油藏的发育不仅具有普遍性,更具有规模大的特点。结合研究区钻井资料认为,龙门山、米仓山前缘地区下组合可能存在较好的保存条件,因此下组合(尤其是灯影组)具有较大的油气勘探潜力。Through analyzing the development and distribution of the lower group＇s bitumen（Sinian-Silurian,containing Devonian） outcrops in the Longmenshan-Micangshan area,the authors find that the Devonian and Cambrian bitumen are concentrated in the Longmenshan area,but the Sinian bitumen mainly develops in Micangshan area.The bitumen in the Longmenshan area is oxidized bitumen with lower thermal maturity.In the Micangshan area,the bitumen is cracking bitumen with high thermal maturity.The difference in thermal maturity elucidates that the bitumen in the two areas has undergone different formation and evolution processes.The paleo-oil pools in the Longmenshan area were uplifted and oxidized to form bitumen before oil-cracking,and the bitumen has never undergone deep bury.The paleo-oil pools in the Micangshan area have undergone deep bury and oil cracked and uplifted to form the bitumen outcrops.By analyzing the Tianjingshan Devonian and Cambrian＇s bitumen and Sinian paleo-oil pool in the Micangshan area,the authors suggest that the paleo-oil pools of the lower group around the edge of Sichuan Basin are common and large scale.Combined with the analyzation of the drilling information,the authors suggest that there are good petroleum geological preserve conditions and good petroleum exploration prospects for the lower group（especially Sinian） in the front area（foreland basin area） of the Longmenshan and Micangshan areas.

关 键 词：沥青 古油藏 震旦系 龙门山 米仓山 

分 类 号：TE122.116[石油与天然气工程—油气勘探]