鄂尔多斯盆地杭锦旗地区断控气藏差异  

Difference of Fault-Controlled Gas Reservoir in Hangjinqi Area,Ordos Basin

作　　者：李勇霖 倪智勇 李晓光[1,2] 韩子敬[1,2] 张威 安川 Li Yonglin;Ni Zhiyong;Li Xiaoguang;Han Zijing;Zhang Wei;An Chuan(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Exploration and Development Research Institute of Sinopec North China Oil and Gas Company,Zhengzhou 450006,China)

机构地区：[1]中国石油大学(北京)油气资源与勘探国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石化华北油气分公司勘探开发研究院,郑州450006

出　　处：《吉林大学学报（地球科学版）》2024年第3期773-783,共11页Journal of Jilin University：Earth Science Edition

基　　金：中国石油化工集团项目(HX20191200)。

摘　　要：鄂尔多斯盆地杭锦旗地区泊尔江海子断裂南北地区工业气流井分布与烃源岩演化程度不匹配,且该断裂南北地区天然气成藏期次存在差异。本文在烃源岩演化史和断裂发育史的基础上,结合天然气组分碳同位素、天然气干燥系数、流体包裹体特征以及断层在不同方向上的封闭性,对断裂南北地区天然气的来源、成藏期次、成藏时间以及运移通道进行对比。结果表明:天然气组分碳同位素符合“正碳同位素序列”特征,即δ^(13)C_(1)<δ^(13)C_(2)<δ^(13)C_(3),表明研究区的天然气是单一来源;断裂南部天然气干燥系数分布在0.85~0.96,平均值为0.91,断裂北部天然气干燥系数分布在0.95~0.97;断裂南部地区下石盒子组储层中与天然气共生的盐水包裹体主频温度主要分布区间为95~115℃与125~135℃,断裂北部地区下石盒子组储层中与天然气共生的盐水包裹体均一温度主要分布在75~155℃之间;结合研究区埋藏史得出断裂南部地区天然气为两期成藏,成藏时间分别是晚侏罗世—早白垩世(155~142 Ma)和早白垩世末(116~110 Ma),北部地区天然气为一期成藏,成藏时间为早白垩世末(128~117 Ma)。泊尔江海子断裂自古生代以来发生了多期活动,其在燕山期的活动是造成断裂南北地区天然气分布、热演化程度、成藏期次差异的主要原因。The distribution of industrial gas wells in the northern and southern regions of the Boerjianghaizi fault in Hangjinqi area of Ordos basin does not match the evolution degree of the source rocks,and the natural gas accumulation periods between the northern and southern regions of the fault are different.On the basis of the evolution history of source rocks and fault development history,combined with the carbon isotopes of natural gas components,the dry coefficient of natural gas,the characteristics of fluid inclusions and the sealing property of the fault in different directions,this paper compares the source,accumulation period,accumulation time and migration channel of natural gas in the northern and southern regions of the fault.The results show that the carbon isotopes of the natural gas components present“positive carbon isotope sequence”,namely,δ^(13)C_(1)<δ^(13)C_(2)<δ^(13)C_(3),suggesting that the natural gas in the study area comes from a single source.The dry coefficient of natural gas in the southern part of the fault ranges from 0.85 to 0.96,with an average value of 0.91.In the northern part of the fault,the dry coefficient of natural gas ranges from 0.95 to 0.97.The homogenization temperature of aqueous inclusions coexisting with natural gas inclusions in the Xiashihezi Formation reservoir ranges in 95-115℃and 125-135℃in the southern area of the fault,and in 75-155℃in the northern part of the fault.Combining with the burial history of the study area,there exist two stages of gas accumulation in the southern part of the fault,the early-stage natural gas charged from Late Jurassic to the Early Cretaceous(155-142 Ma),and the late-stage natural gas charged at the end of Early Cretaceous(116-110 Ma).There is only one stage of the natural gas accumulation in the northern region,and it occurred at the end of Early Cretaceous(128-117 Ma).The Boerjianghaizi fault has been active for many periods since the Paleozoic,and the activities in the Yanshan period are the main reason for the difference of

关 键 词：天然气成藏 流体包裹体 鄂尔多斯盆地 泊尔江海子断裂 杭锦旗地区 

分 类 号：P597[天文地球—地球化学] P618.13[天文地球—地质学]