地学前缘 ›› 2019, Vol. 26 ›› Issue (1): 212-224.DOI: 10.13745/j.esf.sf.2018.12.7

• 深层油气成藏 • 上一篇    下一篇

准噶尔盆地玛湖凹陷百口泉组砾岩储层特征及其主控因素

肖萌，袁选俊，吴松涛，曹正林，唐勇，谢宗瑞，王瑞菊   

  1. 1. 中国石油勘探开发研究院, 北京 100083
    2. 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
  • 收稿日期:2018-03-01 修回日期:2018-11-26 出版日期:2019-01-30 发布日期:2019-01-30
  • 作者简介:肖萌(1988—)，女，博士研究生，主要从事沉积与储层地质学的研究。E-mail:xiaomeng422@126.com
  • 基金资助:
    中国石油天然气股份公司科技攻关项目“大中型岩性地层油气藏富集规律与关键技术研究”(2016B-0304)

Conglomerate reservoir characteristics of and main controlling factors for the Baikouquan Formation, Mahu sag, Junggar Basin

XIAO Meng,YUAN Xuanjun,WU Songtao,CAO Zhenglin,TANG Yong,XIE Zongrui,WANG Ruiju   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
    2. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China
  • Received:2018-03-01 Revised:2018-11-26 Online:2019-01-30 Published:2019-01-30
  • Supported by:
     

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摘要： 综合岩心观察、薄片鉴定及场发射扫描电镜、Quemscan软件、X-衍射、阴极发光、图像分析等分析测试手段，并结合测井、录井和物性等资料，从沉积和成岩两方面对准噶尔盆地玛湖西斜坡百口泉组砾岩储层特征与有利储层的主控因素进行了综合研究。研究表明：砾岩储层骨架颗粒的成分、粒度、分选性和砾岩体的厚度主要由物源和沉积环境共同决定，这些因素控制了埋藏期的压实作用和钙质胶结作用的强弱、成岩环境的特征、孔隙流体的性质、钾长石溶蚀作用以及火山碎屑的蚀变对储层性质的影响。相对扇三角洲平原亚相的水上河道和河道间，发育在扇三角洲前缘亚相的水下分流河道微相的储层厚度较大，刚性颗粒含量高、分选好，易发育绿泥石膜，压实作用相对较弱，孔隙较大且连通性较好，孔隙流体流动性较好，因此，钾长石和岩屑等易溶矿物的溶蚀产物如高岭石、伊利石等自生黏土矿物易被带出而不在原地发生沉淀，对储层物性的改善具有十分重要的作用。此外，处于有机质优势运移方向的储层物性较好。

 

关键词: 准噶尔盆地, 三叠系百口泉组, 砾岩储层特征, 有利储层主控因素

Abstract: We carried out a systematic study on the characteristics of conglomerate reservoir and analyzed the main controlling factors related to sedimentation and diagenesis for favorable reservoir development, through core analysis, thin section observation, QEMSEM, XRD, SEM, CL, fluorescence, imaging analysis, in combination with logging and physical property data. The study results show that the framework grain composition, grain size, sorting and conglomerate stone thickness are determined by the provenance and sedimentary environment, that control the strength of calcite cementation and compaction, diagenetic environment, pore fluid properties, and the influence of orthoclase dissolution on reservoir physical properties. Compared with braided channel and distributary inter-channel, conglomerate stones developed in underwater distributary channel microfacies are much thicker with higher rigid particle content, better sorting, more chlorite films, relatively weaker compaction, larger pores, and better connectivity and pore fluid mobility. Therefore, the dissolution products from orthoclase dissolution, such as kaolinite, illite and other clay minerals, are easily carried out and do not precipitated in situ. These dissolution products play an important role in improving physical properties of reservoirs. Besides, reservoirs along the organic matter migration pathway have better physical properties.

Key words: Junggar Basin, Triassic Baikouquan Formation, reservoir characteristics, main controlling factors

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