石油勘探与开发 >

2021 , Vol. 48 >Issue 6: 1162 - 1174

DOI: https://doi.org/10.11698/PED.2021.06.08

油气勘探

鄂尔多斯盆地奥陶系中组合微生物碳酸盐岩分布规律及沉积模式

  • 魏柳斌 ,
  • 赵俊兴 ,
  • 苏中堂 ,
  • 魏新善 ,
  • 任军峰 ,
  • 黄正良 ,
  • 武春英
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  • 1.油气藏地质及开发工程国家重点实验室,成都 610059;
    2.成都理工大学沉积地质研究院,成都 610059;
    3.中国石油长庆油田公司勘探开发研究院,西安 710018;
    4.低渗透油气田勘探开发国家工程实验室,西安 710018
魏柳斌（1987-）,男,甘肃靖远人,中国石油长庆油田公司工程师,现为成都理工大学在读博士研究生,主要从事碳酸盐岩油气地质综合研究。地址：陕西省西安市未央区长庆油田科技大厦,中国石油长庆油田公司勘探开发研究院,邮政编码：710018。E-mail: weilb_cq@cnpc.com.cn

收稿日期: 2021-01-17

  修回日期: 2021-10-11

  网络出版日期: 2021-11-25

基金资助

国家科技重大专项“大型油气田及煤层气开发”（2016ZX05004-006）; 中国石油天然气集团有限公司重大专项“长庆油田5000万吨持续高效稳产关键技术研究与应用”（2016E-0514）

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Distribution and depositional model of microbial carbonates in the Ordovician middle assemblage, Ordos Basin, NW China

  • WEI Liubin ,
  • ZHAO Junxing ,
  • SU Zhongtang ,
  • WEI Xinshan ,
  • REN Junfeng ,
  • HUANG Zhengliang ,
  • WU Chunying
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610059, China;
    2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    3. Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    4. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China

Received date: 2021-01-17

  Revised date: 2021-10-11

  Online published: 2021-11-25

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摘要

以露头剖面、钻井岩心、铸体薄片等资料为基础,系统分析鄂尔多斯盆地中东部奥陶系中组合（马家沟组马五10—马五5亚段）微生物碳酸盐岩的类型、微相组合及分布规律。研究表明,盆地中东部奥陶系中组合发育蓝细菌钙化作用形成的微生物碳酸盐岩沉积,主要由叠层石、凝块石、核形石微生物坪及微生物丘建造组成。其空间展布具有明显的“层控性”及“区位性”特征：微生物坪受层序旋回及沉积相变控制,主要形成于马五5亚段、马五6亚段的潮坪环境,单层厚度为2~3 m,马五5亚段微生物坪发育在海侵初期的碳酸盐岩-膏盐岩转换界面附近,主要分布在盆地东部米脂洼陷;马五6亚段微生物坪发育在碳酸盐岩-膏盐岩相变带附近,呈环带状分布在中央古隆起东侧地区。古地貌对微生物丘分布的控制更为突出,主要形成于马五10—马五7亚段的微生物丘或丘滩复合体,单层厚度可达25 m,主要分布在乌审旗—靖边古隆起。相关微生物碳酸盐岩发育模式表明,碳酸盐岩-膏盐岩相变带及乌审旗—靖边古隆起是微生物碳酸盐岩油气勘探的有利区带。图9参41

关键词： 鄂尔多斯盆地; 奥陶系马家沟组; 微生物碳酸盐岩; 叠层石; 凝块石; 核形石; 沉积模式

本文引用格式

魏柳斌 , 赵俊兴 , 苏中堂 , 魏新善 , 任军峰 , 黄正良 , 武春英 . 鄂尔多斯盆地奥陶系中组合微生物碳酸盐岩分布规律及沉积模式[J]. 石油勘探与开发, 2021 , 48(6) : 1162 -1174 . DOI: 10.11698/PED.2021.06.08

Abstract

Based on outcrop profiles, drilling cores, cast thin sections etc., the types, microfacies combinations and distribution pattern of microbial carbonates in the Ordovician middle assemblage of mid-eastern Ordos Basin have been systematically analyzed. The middle assemblage of Ordovician in the central and eastern Ordos Basin has microbial carbonates formed by the calcification of cyanobacteria, including microbial biostromes and microbial mounds made of stromatolites, thrombolites, and oncolites. The distribution of the carbonates shows obvious “stratum-control” and “regional” characteristics. The microbial biostromes 2-3 m thick each are controlled by sequence cycles and sedimentary facies changes, and were mainly formed in the tidal flat environment during the depositional stages of the Ma56 and Ma55 sub-members. The microbial biostrome in the Ma55 sub-member occurring near the carbonate-evaporite transition interface in the early stage of the transgression is distributed mainly in the Mizhi subsag in the eastern part of the basin; the microbial biostrome in the Ma56 sub-member turns up near the carbonate-evoporite transition zone in ring shape in the east of the central uplift. The ancient landform had noticeable control on the distribution of microbial mounds. The microbial mounds or mound-shoal complexes developing mainly during the depositional stages of Ma57_Ma510 sub-members are about 15-25 m thick in single layer and distributed largely in the Wushenqi-Jingbian paleouplift. The development model of the microbial carbonate rocks shows that the carbonate-evaporite lithologic transition zone and the Wushenqi-Jingbian paleouplift are favorable exploration zones of microbial carbonates in the Ordovician middle assemblages.

Key words： Ordos Basin; Ordovician Majiagou Formation; microbial carbonates; stromatolite; thrombolite; oncolite; depositional model

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