准噶尔盆地中拐凸起佳木河组沸石类胶结砂砾岩储集层成因机理  

Genesis of Sandy Conglomerate Reservoirs Cemented by Zeolites in Jiamuhe Formation of Zhongguai Swell, Junggar Basin

作　　者：吴和源[1,2] 唐勇[3] 常秋生[3] WU Heyuan;TANG Yong;CHANG Qiusheng(Postdoctoral Program, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;PetroChina Xinjiang Oilfield Company, Postdoctoral Workstation Xinjiang 834000, China;PetroChina Xinjiang Oilfield Company, a.Postdoctoral Workstation Research Institute of Exploration and Development, Karamay,Xinjiang 834000, China)

机构地区：[1]中国石油勘探开发研究院博士后流动站,北京100083 [2]中国石油新疆油田分公司博士后工作站,新疆克拉玛依834000 [3]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《新疆石油地质》2017年第3期281-288,共8页Xinjiang Petroleum Geology

基　　金：国家油气重大专项(2016ZX05047001-004)

摘　　要：沸石类胶结砂砾岩储集层成因机理不明是当前中拐凸起二叠系佳木河组油气勘探面临的关键问题,以岩心观察为基础,显微镜下分析为辅助,结合电子探针等微区地化测试方法,基于沉积相与成岩作用分析,建立沉积环境、成岩环境与储集层成因之间的相互关系,探讨了准噶尔盆地中拐凸起佳木河组砂砾岩储集层成因机理。佳木河组砂砾岩表现为低孔低渗的致密型储集物性特点,其成因可归纳为4点:(1)特殊冲积扇沉积环境布控,是多类型岩相形成的基础;(2)短暂开放性碱性成岩环境诱导,为早期广泛沸石类胶结提供形成环境;(3)快速多次酸性-碱性成岩环境交替,是次生孔隙形成的关键;(4)长期封闭型碱性成岩环境主导,是储集层致密化的重要原因。以洪冲积扇扇缘—扇中亚相为主的佳木河组,6种沉积微相与多种成岩作用共同响应,形成4种沸石类胶结砂砾岩岩相,粗粒径-中等压实-中强胶结-溶蚀成岩相在冲积扇扇缘水下分流河道微相的控制下形成区域范围最为有利的储集层类型,将是后续油气勘探的重点关注目标。The genesis of sandy conglomerate reservoirs cemented by zeolites is the key problem in the exploration of Permian Jiamuhe formation in Zhongguai swell,Junggar basin.Based on core observation and microscopic analysis,and combined with electron probe microanalysis,the paper analyzes the sedimentary facies and diagenesis,establishes the relationships among sedimentary environment,diagenetic environment and reservoir genesis,and discusses the genesis and mechanism of sandy conglomerate reservoirs of Jiamuhe formation in Zhongguai swell,Junggar basin.The sandy conglomerate reservoirs of Jiamuhe formation show some characteristics of tight reservoirs with low porosity and low permeability and the genesis of the reservoirs can be summarized as4points.First,a special sedimentary environment of alluvial fan was the basis of multi?type lithofacies formation.Second,the induction of ephemerally open and alkaline diagenetic environment provided the environment for the early zeolite cementation.Third,multiple and rapid alternation of acid and alkaline diagenetic environments was the key factor of secondary pore formation.Fourth,the long?term and enclosed alkaline environment was the most important reason for the densification of reservoirs.The sedimentary facies of Jiamuhe formation is dominated by fan?margin subfacies-mid?fan subfacies of pluvial?alluvial fan,and4types of sandy conglomerates cemented by zeolites formed under the combined actions of6sedimentary facies and multiple diagenesis.The reservoirs with the lithofacies of coarse grained?medium compaction?medium cementation?medium to strong cementation?dissolution under the control of underwater distributary channel of alluvial fan margin will be the most favorable reservoirs regionally,which will be the key targets for future petroleum exploration.

关 键 词：准噶尔盆地 中拐凸起 佳木河组 沸石 胶结作用 砂砾岩储集层 成因机理 

分 类 号：TE112.221[石油与天然气工程—油气勘探]