渤海湾盆地古近系低熟煤成气地球化学特征  

Geochemistry of low-mature gas derived from Paleogene coal-measure source rock of Bohai Bay Basin

作　　者：刘丹[1] 吴伟[2] 房忱琛[1] 冯子齐[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油西南油气田公司勘探开发研究院,四川成都610051

出　　处：《天然气地球科学》2016年第5期873-882,共10页Natural Gas Geoscience

基　　金：中国石油天然气股份有限公司油气勘探重大科技项目"中国煤成气地球化学与成藏机制规律研究"(编号:2014B-0608)资助

摘　　要：中国低熟煤成气的发现及研究始于渤海湾盆地辽河坳陷、苏北盆地等区块,但其后低熟气勘探主要在吐哈盆地中生代获得突破,因此早期煤成低熟气地球化学研究主要集中于吐哈盆地。近年来在渤海湾盆地辽河坳陷及黄骅坳陷低熟煤成气勘探初见成效,为系统、深入研究低熟煤成气地球化学特征提供了机遇。以渤海湾盆地黄骅坳陷和辽河坳陷古近系低熟煤成气为研究对象,结合吐哈盆地中生代低熟煤成气地球化学特征,对中国低熟煤成气地球化学特征进行了完善,同时对渤海湾盆地低熟气勘探潜力进行了探讨。结果表明:渤海湾盆地黄骅坳陷和辽河坳陷古近系天然气δ^(13)C_1<-39‰、δD_1<-200‰、δ^(13)C_2-δ^(13)C_1>10‰、烃源岩RO值介于0.5%~0.9%之间,具有与吐哈盆地类似的低熟煤成气特征。在渤海湾盆地除了黄骅坳陷和辽河坳陷外,其他坳陷沙河街组也具有低熟气勘探潜力;渤中凹陷、歧北次凹、东营民丰凹陷东营组亦有低熟气勘探潜力。Low mature gas derived from coal-measure was first discovered in Liaohe Sag of Bohai Basin and Subei Basin.However,large amount of low-mature gas derived from coal-measure source rock has only been developed in the Turpan-Hami Basin.As a result,research on the geochemistry of this kind of gas is mainly based on the data from Turpan-Hami Basin and the geochemistry data of gas in other basins are limited.In recent years,some new wells have been drilled in the Palaeogene reservoirs of Liaohe Depression and Huanghua Depression of Bohai Bay Basin and the gas turned out to be low-mature gas derived from coal-measure source rocks.So in this paper we integrated the data of Bohai Bay Basin with the data of Turpan-Hami Basin to study the geochemical characteristics of low-mature coal derived gas in China.We also discussed the exploration potential of low-mature gas derived from coal-measure source rock in Bohai Bay Basin.The results show that the low-mature gas of Bohai Bay Basin mainly hasδ（13） C1〈 -39‰,δD1〈-200‰,and δ（13）C2-δ（13）C1〉10‰,the ROof the source rock ranges from 0.5% to 0.9%.In the Bohai Bay Basin,besides Huanghua and Liaohe Depressions,all the other depressions have the exploration potential of low mature gas derived from coal-measure source rock in Shahejie reservoirs.Also,the Bozhong,Huanghuaqibei,and Dongyingminfeng Depressions have exploration potential of low-mature gas in Dongying reservoirs.

关 键 词：低熟气 渤海湾盆地 吐哈盆地 煤系 

分 类 号：TE122.1[石油与天然气工程—油气勘探]