摘要
目前已在准噶尔盆地乌伦古坳陷石炭系、二叠系、三叠系和侏罗系等发现了工业油气流或油气显示,这些油气主要来源于石炭系烃源岩。但目前研究区石炭系有效烃源岩分布及生烃演化特征不清楚。对比分析了研究区石炭系不同层段、不同岩性类型烃源岩的生烃潜力和热演化特征。结果表明:巴塔玛依内山组凝灰质泥岩、泥岩和姜巴斯套组炭质泥岩有机质丰度较高,有机质类型以Ⅱ2-Ⅲ型为主,处于成熟—过成熟演化阶段,具有倾气性特征。综合应用地球化学实验数据得出姜巴斯套组烃源岩都是有效气源岩,而目前钻井揭示巴塔玛依内山组烃源岩成熟度偏低,未能达到有效气源岩的标准。通过系统对比研究区与滴水泉凹陷石炭系烃源岩地球化学参数,认识到两地区具有高度相似性。可见准噶尔盆地乌伦古坳陷中南部石炭系姜巴斯套组是一套极具潜力的烃源岩,为下一步油气勘探指明方向。
At present,industrial oil and gas flows or oil and gas displays have been discovered in the Carboniferous,Permian,Triassic and Jurassic in the Wulungu Depression of the Junggar Basin.These oil and gas are mainly derived from Carboniferous source rocks.However,the distribution of effective source rocks and the characteristics of hydrocarbon generation and evolution of the Carbo-niferous in the study area are unclear.The hydrocarbon generation potential and thermal evolution characteristics of different layers and different lithological types of source rocks in the Carboniferous in the study area was comparatively analyzed.The results show that the tuffaceous mudstone and mudstone of the Upper Carboniferous Batamayineishan Formation and the carboniferous mudstone of the lower Carboniferous Jiangbasitao Formation have high organic matter abundance,and the organic matter type is mainlyⅡ2-Ⅲ,which is in the mature to over-mature evolution stage,and has the characteristics of gas inclined.The comprehensive application of geochemical test data shows that the source rock of the Jiangbasitao Formation is an effective gas source rock,while the current drilling revealed that the maturity of the source rock of the BatamayiNeishan Formation is low,which fails to meet the standard of effective gas source rock.Through systematic comparison of the geochemical parameters of the carboniferous source rocks in the study area and the Dishuiquan sag.It is found that there are high similarities between them.It can be seen that Jiangbasitao Formation of Carboniferous is a set of potential hydrocarbon source rocks in the Central-Southern Wulungu Depression in Junggar Basin,it points out the direction for the next oil and gas exploration.
作者
肖伟
张枝焕
陈雪
张学才
张婵
XIAO Wei;ZHANG Zhi-huan;CHEN Xue;ZHANG Xue-cai;ZHANG Chan(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102200,China;Manage Center of Oil and Gas Exploration of Shengli Oilfield Company,SINOPEC,Dongying 257000,China)
出处
《科学技术与工程》
北大核心
2021年第35期15002-15011,共10页
Science Technology and Engineering
基金
“十三五”国家科技重大专项(2017ZX05049-006)。
关键词
乌伦古坳陷中南部
石炭系
烃源岩特征
生烃潜力
有效烃源岩
South-central Wulungu Depression
carboniferous
source rock characteristics
hydrocarbon generating potential
effective source rock
