石油勘探与开发 >

2020 , Vol. 47 >Issue 6: 1159 - 1173

DOI: https://doi.org/10.11698/PED.2020.06.09

油气勘探

鄂尔多斯盆地苏里格气田东区奥陶系马家沟组早成岩期岩溶及其控储效应

  • 谢康 ,
  • 谭秀成 ,
  • 冯敏 ,
  • 王保保 ,
  • 钟寿康 ,
  • 杨梦颖 ,
  • 聂万才 ,
  • 乔占峰 ,
  • 曾伟
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  • 1.油气藏地质及开发工程国家重点实验室 西南石油大学,成都 610500;
    2.中国石油集团碳酸盐岩储层重点实验室西南石油大学研究分室,成都 610500;
    3.中国石油长庆油田分公司勘探开发研究院,西安 710018;
    4.中国石油长庆油田分公司宜黄天然气项目部,西安 710018;
    5.中国石油集团碳酸盐岩储层重点实验室,杭州 310023
谢康（1995-）,男,湖北仙桃人,硕士,主要从事碳酸盐岩储集层地质学研究相关工作。地址：四川省成都市新都区新都大道8号,西南石油大学,邮政编码：610500。E-mail: xie.kang@foxmail.com

收稿日期: 2020-03-05

  修回日期: 2020-11-05

  网络出版日期: 2020-11-27

基金资助

“十三五”国家科技攻关重大专项（2016ZX05004006-001-002）; 中国石油-西南石油大学创新联合体科技合作项目

收起

Eogenetic karst and its control on reservoirs in the Ordovician Majiagou Formation, eastern Sulige gas field, Ordos Basin, NW China

  • XIE Kang ,
  • TAN Xiucheng ,
  • FENG Min ,
  • WANG Baobao ,
  • ZHONG Shoukang ,
  • YANG Mengying ,
  • NIE Wancai ,
  • QIAO Zhanfeng ,
  • ZENG Wei
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. Department of Key Laboratory of Carbonate Reservoir of CNPC, Southwest Petroleum University, Chengdu 610500, China;
    3. Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    4. Yihuang Natural Gas Department of PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    5. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China

Received date: 2020-03-05

  Revised date: 2020-11-05

  Online published: 2020-11-27

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摘要

为进一步明确鄂尔多斯盆地奥陶系马家沟组储集层成因,以苏里格气田东区马家沟组马五4-马五1亚段为例,通过大量岩心及薄片观察,剖析早成岩期岩溶垂向发育特征,探究其溶蚀机理和控储效应。岩石学特征分析表明马五4-马五1亚段主要发育泥粉晶白云岩、颗粒白云岩和微生物白云岩3类储集岩,其主要储集空间类型分别为溶模孔、粒间（溶）孔和（溶扩）残余格架孔洞。研究区发育多期向上变浅序列,单一向上变浅序列顶部存在暴露面,暴露面之下的岩溶系统内可见典型的早期暴露溶蚀和充填特征。指示这3类孔隙型储集层发育应与相控早成岩期暴露岩溶相关,随岩溶强度增加,岩溶作用对储集层的建设性作用转变为破坏性作用。图11参29

关键词： 孔隙型储集层; 储集层特征; 早成岩期岩溶; 白云岩; 马家沟组; 奥陶系; 苏里格气田; 鄂尔多斯盆地

本文引用格式

谢康 , 谭秀成 , 冯敏 , 王保保 , 钟寿康 , 杨梦颖 , 聂万才 , 乔占峰 , 曾伟 . 鄂尔多斯盆地苏里格气田东区奥陶系马家沟组早成岩期岩溶及其控储效应[J]. 石油勘探与开发, 2020 , 47(6) : 1159 -1173 . DOI: 10.11698/PED.2020.06.09

Abstract

To further ascertain the origin of the Ordovician Majiagou Formation reservoirs in the Ordos Basin, the M54-M51 sub-members of the Ordovician Majiagou Formation in the eastern Sulige gasfield of Ordos Basin were taken as examples to analyze the vertical development characteristics of eogenetic karst and to discover the dissolution mechanism and its control on reservoirs through observation of a large number of cores and thin sections, with petrological characteristics and sedimentary sequence as main clue. According to detailed analysis of petrologic characteristics, the reservoir rock types include muddy to micritic dolomite, grain dolomite and microbialite which have mainly moldic pore and intercrystalline (dissolved) pore, intergranular (dissolved) pore, and (dissolved) residual fenestral pore as main reservoir space respectively. The study area developed upward-shallowing sequences, with an exposure surface at the top of a single upward-shallowing sequence. The karst systems under the exposure surface had typical exposure characteristics of early dissolution and filling, indicating these reservoirs were related to the facies-controlled eogenetic karstification. With the increase of karstification intensity, the reservoirs became worse in physical properties.

Key words： porous reservoir; reservoir characteristics; eogenetic karst; dolomite; Majiagou Formation; Ordovician; Sulige gas field; Ordos Basin

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