Microfacies and depositional model of a carbonate-evaporite symbiotic system of the Majiagou Formation in Ordos Basin

doi:10.7605/gdlxb.2024.02.021

JOPC ›› 2024, Vol. 26 ›› Issue (2): 279-295. doi: 10.7605/gdlxb.2024.02.021

• LITHOFACIES PALAEOGEOGRAPHY AND SEDIMENTOLOGY • Previous Articles Next Articles

Microfacies and depositional model of a carbonate-evaporite symbiotic system of the Majiagou Formation in Ordos Basin

LIU Guoqing¹, SU Zhongtang^1,2, HAO Zhilei^3,4, WEI Liubin³, REN Junfeng³, LIAO Huihong¹, WU Haowen¹

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

Received:2023-03-23 Revised:2023-10-08 Online:2024-04-01 Published:2024-04-03
Contact: SU Zhongtang,born in 1981,professor,is mainly engaged in research on sedimentology.E-mail: suzhongtang2012@cdut.edu.cn.
About author:LIU Guoqing,born in 1998,master degree candidate,majors in geology. E-mail: liuguoqing20210226@163.com.
Supported by:
Financially supported by the Major Science and Technology Special Project of PetroChina Changqing Oilfield Company(No. ZDZX2021)

鄂尔多斯盆地马家沟组碳酸盐岩-膏盐岩共生体系沉积微相与沉积模式^*

刘国庆¹, 苏中堂^1,2, 郝志磊^3,4, 魏柳斌³, 任军锋³, 廖慧鸿¹, 吴浩文¹

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

通讯作者: 苏中堂,男,1981年生,成都理工大学教授,主要从事沉积学相关研究工作。E-mail: suzhongtang2012@cdut.edu.cn。
作者简介:刘国庆,男,1998年生,成都理工大学硕士研究生,地质学专业。E-mail: liuguoqing20210226@163.com。
基金资助:
*中国石油长庆油田分公司重大科技专项(编号: ZDZX2021)资助

Abstract

Abstract: The carbonate-evaporite symbiotic system is a rock symbiotic association formed by chemical depositional differentiation. Microfacies analysis and sedimentary model construction of such a system are conducive to revealing the sedimentary information that have guiding significance for oil and gas exploration in evaporatic environments. Based on a large number of borehole data of the Majiagou Formation in Ordos Basin,macro-and microscopic observation of the rocks was carried out to identify sedimentary microfacies,analyze sedimentary sequence,and construct sedimentary model.The results show that there are ten types of sedimentary microfacies(MFT1-MFT10)in the carbonate-evaporite symbiotic system of the Majiagou Formation: halite,gypsum,gypsum-bearing dolomite,laminated dolomite,crystalline dolomitic grainstone,microcrystalline dolomite,microbial dolomite,bioturbated dolomite,laminated limestone,crystalline grainstone. four types of sedimentary sequence are developed in the symbiotic system: (1)upper intertidalto supratidal dolomite-gypsodolomite-argillaceous dolostone;(2)lower intertidal evaporite-algal dolomite-dolomite;(3)subtidal laminated limestone-churned limestone-bioturbation limestone;(4)lagoonal laminated evaporite-lumpy evaporite-salt rock. Evaporites of the Majiagou Formation were formed during the shallow basins period and low sea level period,while carbonates were formed during the high sea level period.The giant carbonate-evaporite symbiotic system formed through repeated fluctuations in sea level.

Key words: microfacies, bioturbated dolostone, microbial dolostone, sedimentary model, Majiagou Formation, Ordos Basin

摘要： 碳酸盐岩-膏盐岩共生体系是化学沉积分异作用形成的岩石共生组合,对其进行微相分析和沉积模式构建,有利于揭示蒸发环境下的沉积学信息,对油气勘探具有指导意义。依据鄂尔多斯盆地奥陶系马家沟组大量钻井、岩心资料,开展岩石宏观、微观观察,识别沉积微相,分析沉积序列,构建沉积模式。结果表明: 马家沟组碳酸盐岩-膏盐岩共生体系可划分出10类微相(MFT1-MFT10): 盐岩、膏岩、含膏云岩、纹层状微粉晶云岩、颗粒云岩、粉—细晶白云岩、微生物云岩、生物扰动(灰)云岩、纹层状微晶灰岩、微晶颗粒灰岩; 共生体系发育4类微相组合: (1)潮间上带—潮上带白云岩-含膏云岩-泥云岩组合; (2)潮间下带膏岩-藻云岩-白云岩组合; (3)潮下带纹层状灰岩-搅动灰岩-扰动灰岩组合;(4)潟湖内层状膏岩-团块状膏岩-盐岩组合。马家沟组为浅盆蒸发成盐,低海平面蒸发成盐,高海平面发育碳酸盐岩,海平面反复波动形成巨厚碳酸盐岩—膏盐岩共生组合。

关键词: 微相, 生物扰动云岩, 微生物云岩, 沉积模式, 马家沟组, 鄂尔多斯盆地

CLC Number:

P512.2

LIU Guoqing, SU Zhongtang, HAO Zhilei, WEI Liubin, REN Junfeng, LIAO Huihong, WU Haowen. Microfacies and depositional model of a carbonate-evaporite symbiotic system of the Majiagou Formation in Ordos Basin[J]. JOPC, 2024, 26(2): 279-295.

刘国庆, 苏中堂, 郝志磊, 魏柳斌, 任军锋, 廖慧鸿, 吴浩文. 鄂尔多斯盆地马家沟组碳酸盐岩-膏盐岩共生体系沉积微相与沉积模式^*[J]. 古地理学报, 2024, 26(2): 279-295.

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Microfacies and depositional model of a carbonate-evaporite symbiotic system of the Majiagou Formation in Ordos Basin

鄂尔多斯盆地马家沟组碳酸盐岩-膏盐岩共生体系沉积微相与沉积模式^*

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Microfacies and depositional model of a carbonate-evaporite symbiotic system of the Majiagou Formation in Ordos Basin

鄂尔多斯盆地马家沟组碳酸盐岩-膏盐岩共生体系沉积微相与沉积模式*

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鄂尔多斯盆地马家沟组碳酸盐岩-膏盐岩共生体系沉积微相与沉积模式^*