准噶尔盆地玛湖凹陷大油(气)区形成条件与勘探方向研究  

Study on the Forming Conditions and Exploration Fields of the Mahu Giant Oil(Gas) Province,Junggar Basin

作　　者：雷德文[1] 陈刚强[1,2] 刘海磊[1] 李啸[1,3] 阿布力米提[1] 陶柯宇 曹剑[4] LEI Dewen CHEN Gangqiang LIU Hailei LI Xiao Abulimit TAO Keyu CAO Jian(Research Institute of Petroleum Exploration and Development, PetroChina Xinjiang Oil field Company, Karamay, Xinjiang, 843000 School of Petroleum, Karamay Campus, China University of Petroleum （Beijing） , ,Karamay, Xinjiang , 843000 School of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500 School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023)

机构地区：[1]中国石油新疆油田公司勘探开发研究院,新疆克拉玛依834000 [2]中国石油大学(北京)克拉玛依校区石油学院,新疆克拉玛依834000 [3]西南石油大学地球科学与技术学院,成都610500 [4]南京大学地球科学与工程学院,南京210093

出　　处：《地质学报》2017年第7期1604-1619,共16页Acta Geologica Sinica

基　　金：国家重大专项"准噶尔盆地岩性地层油气藏分布规律与目标评价"(编号:2016ZX05001005);中石油股份公司"新疆大庆"重大科技专项课题"富烃凹陷岩性地层油气藏富集规律与关键技术研究"(编号2012E-34-01)联合资助成果

摘　　要：准噶尔盆地西北缘玛湖凹陷是全球著名的湖相富烃凹陷,最新勘探成果展示出大油(气)区特征。为及时总结,丰富发展当代中国特色叠合盆地油气地质理论与勘探实践,本文主要分析了这一大油(气)区的基本形成条件与勘探领域。结果表明,玛湖凹陷大油(气)区得以形成主要缘于三大有利基础条件:前陆碱湖优质高效烃源岩、立体输导体系、三类规模有效储层与储盖组合,由此造就油气在充足的烃源条件下,沿立体的输导体系,被三套区域性盖层有效封盖,向着三类规模有效储层,在有利圈闭中运聚成藏,因此油气富集规律可归纳为"源-输控烃、储-盖控藏"。相应,按目的层和圈闭类型形成了三大有利油气成藏领域,由浅至深依次为三叠系下统百口泉组岩性油(气)藏群、二叠系下统风城组致密油、石炭系—下二叠统大构造油气藏群。玛湖凹陷大油(气)区的勘探突破缘于勘探理念创新,具有巨大勘探潜力和基础科学研究意义。The Mahu sag in the northwestern margin of the Junggar Basin, NW China, is a well-known petroliferous sag globally. Recent exploration results indicate the oil-bearing characteristic in this area. Therefore, in order to summarize the geological theory and exploration methods in superimposed basin, this study performed detailed oil-forming condition and preferential areas for this hydrocarbon province. The results show that the formation of the giant oil and gas field in the Mahu sag was based on the three preferential conditions, high-quality alkaline lacustrine source rocks formed under foreland settings, well- developed multiple types of migration pathways, and three types of effective reservoirs and reservoir-cap rock assemblages. As a consequence, large amounts of oil and gas migrated along multiple types of pathways and are accumulated in the three types of reservoirs and favorable traps under the effective sealing of three sets of caprock sequences. Oil and gas at the condition of sufficient hydrocarbon migrates along the transport system, are effectively covered by three regional caprocks, and finally form three kinds of reservoirs in the favorable traps. Therefore, the enrichment rule of oil and gas can be summarized as source-migration controlling the primary hydrocarbon accumulation and reservoir-caprock controlling the hydrocarbon pool formation. Accordingly, three hydrocarbon accumulation fields formed from top to bottom are stratigraphic oil （gas） plays in the lower Triassic Baikouquan Formation, tight oils in the lower Permian Fengcheng Formation, and structural oil and gas plays in the Carboniferous to lower Permian. The exploration breakthrough in the Mahu giant oil （gas） province was initiated by theoretical innovations, which will have huge exploration potential and fundamental scientific significance.

关 键 词：大油(气)区 “连续型”油气藏 致密油 油气成藏 油气富集 玛湖凹陷 准噶尔盆地 

分 类 号：P618.13[天文地球—矿床学]