岩性油气藏 ›› 2020, Vol. 32 ›› Issue (3): 82–92.doi: 10.12108/yxyqc.20200308

• 油气地质 • 上一篇    下一篇

玛湖地区三叠系克拉玛依组优质砂砾岩储层形成机制

徐子煜1, 王安2, 韩长城1, 田继军1, 张军生1, 刘磊1, 张楠1   

  1. 1. 新疆大学 地质与矿业工程学院, 乌鲁木齐 830046;
    2. 中国石油测井有限公司 华北事业部, 河北 任丘 062550
  • 收稿日期:2019-09-19 修回日期:2019-10-23 出版日期:2020-05-21 发布日期:2020-04-30
  • 通讯作者: 韩长城(1984-),男,博士,硕士生导师,主要从事沉积地质与油气地质方面的教学与研究工作。Email:hanchangchen@126.com。 E-mail:hanchangchen@126.com
  • 作者简介:徐子煜(1994-),男,新疆大学在读硕士研究生,研究方向为沉积地质与石油地质。地址:(830046)新疆乌鲁木齐市天山区新疆大学地质与矿业工程学院。Email:811326475@qq.com
  • 基金资助:
    新疆维吾尔自治区天山英才第二期项目“新疆北部侏罗纪巨厚煤层的煤岩特征与煤相演替”（编号：2016-178）资助

Formation mechanism of high-quality sandy-conglomerate reservoir of Triassic Karamay Formation in Mahu area

XU Ziyu1, WANG An2, HAN Changcheng1, TIAN Jijun1, ZHANG Junsheng1, LIU Lei1, ZHANG Nan1   

  1. 1. College of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, China;
    2. North China Business Department of Well Logging Co., Ltd., CNPC, Renqiu 062550, Hebei, China
  • Received:2019-09-19 Revised:2019-10-23 Online:2020-05-21 Published:2020-04-30

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摘要： 为明确准噶尔盆地玛湖地区三叠系克拉玛依组优质砂砾岩储层的形成机制，开展了岩心观察、薄片鉴定、测井资料分析、压汞和物性测试和扫描电镜分析，并对优质储层的平面分布和成岩演化进行了综合研究。结果表明：①玛湖地区三叠系克拉玛依组主要为辫状河三角洲相和扇三角洲相沉积，其中分流河道砂砾岩、坝体以及席状砂为主要储集层；② 3种储集体相互叠置，其中在三角洲前缘亚相的水下分流河道砂体发育削截式河道构型和完整式河道构型，储层厚度最大，粒度最粗，储集性最好，而席状砂以粉砂岩为主，厚度较薄，粒度较细，储集性相对较差；③成岩环境对储层孔隙演化具有一定的控制作用，成岩晚期发生的绿泥石沉淀和方解石胶结作用降低了储层物性，从而形成了现今的低孔-特低渗型储层。该研究成果对玛湖地区三叠系克拉玛依组油气勘探具有指导意义。

关键词: 砂砾岩储层, 沉积展布, 成岩环境, 优质储层, 三叠系, 玛湖地区

Abstract: In order to clarify the formation mechanism of high-quality sandy-conglomerate reservoir of Triassic Karamay Formation in Mahu area of Junggar Basin,core observation,thin section identification,logging data analysis,mercury injection and physical property measurement and scanning electron microscope analysis were carried out,meanwhile the plane distribution and diagenetic evolution of high-quality reservoir were studied comprehensively. The results show that:(1) The Karamay Formation in Mahu area is mainly composed of braided river delta facies and fan delta facies,in which distributary channel conglomerates,dam bodies and sheet sands are the main reservoirs.(2) Three kinds of reservoirs are superposed with each other. The underwater distributary channel sands in delta front subfacies develop truncated river channel sand body and multiple sedimentary composite sand body,with the largest reservoir thickness,the coarsest grain size and the best reservoir properties, while sheet sand is mainly siltstone,with thin reservoir thickness,fine grain size and relatively poor reservoir properties.(3) Diagenetic environment has a certain control over the evolution of reservoir pores. The chlorite precipitation and calcite cementation in the late diagenetic stage reduced the reservoir physical properties,thus forming the present low porosity and ultra-low permeability reservoir. The research results have guiding significance for oil and gas exploration of Karamay Formation in Mahu area.

Key words: sandy-conglomerate reservoir, sedimentary distribution, diagenetic environment, high-quality reservoir, Triassic, Mahu area

中图分类号: 

  • TE122
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