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天然气地球科学

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塔里木盆地柯坪地区下寒武统台缘相白云岩储层建模

李保华，邓世彪，陈永权，刘沛显，张艳秋，关平，严威，金亦秋   

  1. 1.中国石油塔里木油田公司勘探开发研究院，新疆 库尔勒 841000；
    2.北京大学造山带与地壳演化教育部重点实验室，北京大学地球与空间科学学院，北京 100871
  • 收稿日期:2014-08-29 修回日期:2014-12-01 出版日期:2015-07-10 发布日期:2015-07-10
  • 作者简介:李保华(1973-)，男，湖北监利人，高级工程师，博士，主要从事碳酸盐岩勘探开发地质研究. E-mail：libaoh-tlm@petrochina.com.cn.
  • 基金资助:

    国家科技重大专项(编号：2011ZX05004-004-005)；中国石油科技重大专项(编号：22121G20112001)联合资助.

The Reservoir Modeling of Platform Margin Dolostone of Xiaoerblak Formation,Lower Cambrian,Kalpin Area,Tarim Basin

LI Bao-hua，DENG Shi-biao，CHEN Yong-quan，LIU Pei-xian，ZHANG Yan-qiu，GUAN Ping，YAN Wei，JIN Yi-qiu   

  1. 1.Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla 841000,China;
    2.Key Laboratory of Orogenic Belts and Crustal Evolution,MOE;School of Earth and Space Sciences,
    Peking University,Beijing 100871,China
  • Received:2014-08-29 Revised:2014-12-01 Online:2015-07-10 Published:2015-07-10

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摘要：

塔里木盆地寒武系发育大规模优质台地边缘相礁滩型白云岩储层，油气勘探前景广阔。通过对柯坪地区7条下寒武统野外露头剖面的精细测量及室内岩石薄片观察和物性测试，明确了该区下寒武统肖尔布拉克组的岩石地层和沉积储层特征，并通过剖面对比厘清了台缘带内部沉积结构和储层空间展布规律，最终建立了台缘礁滩型白云岩沉积储层模型。研究表明，该区肖尔布拉克组可分为上、下2段，肖下段以泥粉晶白云岩为主，为缓坡型台地边缘潮下带低能沉积；肖上段可划分为3个亚段，以藻纹层白云岩、微生物礁白云岩、球粒白云岩和叠层石白云岩为主，为弱镶边型台地边缘高能沉积。台缘带白云岩储层的发育受沉积相控制，主要发育在肖上二亚段和肖上三亚段的颗粒滩相白云岩中，储集空间以溶蚀孔和晶间孔为主，孔隙度范围为0.6%～9.02%，平均为5.5%，储层平均厚度为30～40m，在垂直台缘带方向展布宽度在25km以上。

关键词: 塔里木盆地, 柯坪, 下寒武统, 肖尔布拉克组, 台缘, 白云岩, 储层建模

Abstract:

The platform margin reef shoal dolostones of Cambrian in the Tarim Basin contain large scale qualitative reservoirs and have a promising exploration prospect.In this paper,the lithostratigraphic and reservoir characteristics of the platform margin dolostones were described,through fine measurement,thin section analysis and porosity test of seven recently found field sections of Xiaoerblak Formation,Lower Cambrian,Kalpin area.Moreover,the inner structure and reservoir lateral distribution of the platform margin belt were discussed and a semi-quantitative reservoir model of the platform margin dolostone was established by section sedimentary facies and reservoir correlation.According to the research results,Xiaoerblak Formation is divided into two members and the upper member is further divided into three sub-members.The lower member is mainly composed of micritic and crystalline dolostones,which indicates a low-energy subtidal environment in a ramp platform margin.The upper member is mainly composed of algal-laminated dolostones,microbial reef dolostones,pelletal dolostones and stromatolitic dolostones,which indicate a high-energy environment in a feebly rimmed platform margin.The dolostone reservoir of platform margin is controlled by sedimentary facies and develops dominantly in the granular beach dolostone of the upper sub-member Ⅱ and Ⅲ.The main reservoir spaces are corroded vug and recrystallized intercrystal pore,and the reservoir porosity ranges from 0.6% to 9.02%,with an average of 5.5%.The average thickness of reservoir is 30m to 40m and the width of reservoir is 25km at least.

Key words: Tarim Basin, Kalpin, Lower Cambrian, Xiaoerblak Formation, Platform margin, Dolostone, Reservoir modeling

中图分类号: 

  • TE121.3

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