Development characteristics and significance of microbial carbonate reservoirs in the fifth submember of Member 5 of Ordovician Majiagou Formation in the eastern Ordos Basin

doi:10.7623/syxb202108004

Acta Petrolei Sinica ›› 2021, Vol. 42 ›› Issue (8): 1015-1025.DOI: 10.7623/syxb202108004

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Development characteristics and significance of microbial carbonate reservoirs in the fifth submember of Member 5 of Ordovician Majiagou Formation in the eastern Ordos Basin

Wei Liubin^1,2,3,4, Bao Hongping^3,4, Yan Ting^3,4, Guo Wei^3,4, Zhou Lixia^3,4, Jing Xianghui^3,4

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Sichuan Chengdu 610059, China;
2. Institute of Sedimentary Geology, Chengdu University of Technology, Sichuan Chengdu 610059, China;
3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710018, China;
4. National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields, Shaanxi Xi'an 710018, China

Received:2020-02-25 Revised:2020-12-21 Online:2021-08-25 Published:2021-08-31

鄂尔多斯盆地东部奥陶系马家沟组五段5亚段微生物碳酸盐岩发育特征及储集意义

魏柳斌^1,2,3,4, 包洪平^3,4, 严婷^3,4, 郭玮^3,4, 周黎霞^3,4, 井向辉^3,4

1. 油气藏地质及开发工程国家重点实验室四川成都 610059;
2. 成都理工大学沉积地质研究院四川成都 610059;
3. 中国石油长庆油田公司勘探开发研究院陕西西安 710018;
4. 低渗透油气田勘探开发国家工程实验室陕西西安 710018

通讯作者: 魏柳斌,男,1987年5月生,2009年获吉林大学学士学位,2012年获成都理工大学硕士学位,现为中国石油长庆油田公司勘探开发研究院工程师,主要从事碳酸盐岩油气地质研究。
作者简介:魏柳斌,男,1987年5月生,2009年获吉林大学学士学位,2012年获成都理工大学硕士学位,现为中国石油长庆油田公司勘探开发研究院工程师,主要从事碳酸盐岩油气地质研究。Email:weilb_cq@petrochina.com.cn
基金资助:
国家科技重大专项"鄂尔多斯盆地奥陶系—元古界成藏条件研究与区带目标评价"（2016ZX05004-006）和中国石油天然气集团公司科技重大专项"鄂尔多斯盆地碳酸盐岩新领域综合研究与区带分析"（2016E-0514）资助。

Abstract

Abstract: Based on the data of drilling cores, casting thin sections, and scanning electron microscopy (SEM), this paper studies the development, distribution and characteristics of microbial carbonate reservoirs at the bottom of the fifth submember of Member 5 of Majiagou Formation in the eastern Ordos Basin, and gets the following understandings. (1) The development period of microbial carbonate rocks shows obviously special characteristics. The lithological transition period from gypsum rock to carbonate rock is the main development period of microbial carbonate rocks. (2) The rock types of microbial carbonate rocks have significantly regional characteristics and are obviously controlled by ancient landforms and seawater salinity. From east to west, the seawater salinity gradually decreases from the intertidal zone to the subtidal zone, and the rock types of microbolite change from stromatolite to clotted limestone. (3) The pore types of microbial carbonate reservoirs have obvious specificity. The thrombolite dolomite and the stromatolite dolomite are mainly characterized by the development of intercrystalline pores and algae framework pores, respectively. (4) Thrombolite dolomite is controlled by reflux-seepage dolomitization, and it is distributed in a ring-like shape on the east side of the central palaeohigh. The development of stromatolite dolomite with a lamellar structure is related to microbial-induced dolomitization, and it is continuously distributed in the Mizhi-Shenmu area of the eastern Ordos Basin. The research suggests that the microbial carbonate rocks have a certain degree of reservoir quality and can become an important target series of strata for gas exploration in the coexisting system of carbonate rock and gypsum rock in Majiagou Formation.

Key words: Ordos Basin, microbial carbonate rock, stromatolite, thrombolite, oncolite

摘要： 基于钻井岩心、铸体薄片和扫描电镜等资料，研究了鄂尔多斯盆地东部马家沟组五段5亚段底部微生物碳酸盐岩的发育、分布规律及储层特征，取得了以下几点认识：①微生物碳酸盐岩的发育时期具有明显的特殊性，膏盐岩—碳酸盐岩的岩性转换期是微生物碳酸盐岩的主要发育期；②微生物碳酸盐岩的岩石类型具有明显的地域性，明显受古地貌和海水盐度控制，自东向西，由潮间带向潮下带海水盐度逐渐降低，微生物岩的岩石类型由叠层石向凝块石转变；③微生物碳酸盐岩储层的孔隙类型具有明显的专属性，凝块石白云岩以发育晶间孔为主，叠层石白云岩以发育窗格孔为主；④凝块石白云岩受回流-渗透白云石化作用控制，呈环带状分布于中央古隆起东侧，叠层石白云岩与微生物诱导白云石化作用有关，呈层状连续分布于鄂尔多斯盆地东部米脂—神木地区。研究认为，微生物碳酸盐岩具备一定的储集性，可成为马家沟组碳酸盐岩、膏盐岩共生体系天然气勘探的重要目的层系。

关键词: 鄂尔多斯盆地, 微生物碳酸盐岩, 叠层石, 凝块石, 核形石

CLC Number:

TE122.2

Wei Liubin, Bao Hongping, Yan Ting, Guo Wei, Zhou Lixia, Jing Xianghui. Development characteristics and significance of microbial carbonate reservoirs in the fifth submember of Member 5 of Ordovician Majiagou Formation in the eastern Ordos Basin[J]. Acta Petrolei Sinica, 2021, 42(8): 1015-1025.

魏柳斌, 包洪平, 严婷, 郭玮, 周黎霞, 井向辉. 鄂尔多斯盆地东部奥陶系马家沟组五段5亚段微生物碳酸盐岩发育特征及储集意义[J]. 石油学报, 2021, 42(8): 1015-1025.

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Development characteristics and significance of microbial carbonate reservoirs in the fifth submember of Member 5 of Ordovician Majiagou Formation in the eastern Ordos Basin

鄂尔多斯盆地东部奥陶系马家沟组五段5亚段微生物碳酸盐岩发育特征及储集意义

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