Characteristics, formation and evolution of pre-salt dolomite reservoirs in the fifth member of the Ordovician Majiagou Formation, mid-east Ordos Basin, NW China

被引：0
|
作者：
Fu S. [1 ,2 ]
Zhang C. [1 ,2 ]
Chen H. [1 ,2 ]
Chen A. [1 ,2 ]
Zhao J. [1 ,2 ]
Su Z. [1 ,2 ]
Yang S. [1 ,2 ]
Wang G. [2 ]
Mi W. [3 ]
机构：
[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu
[2] Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu
[3] School of Mines, Inner Mongolia University of Technology, Hohhot
来源：
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2019年 / 46卷 / 06期
关键词：
Dissolution; Dolomite; Dolomitization; Gypsum-salt rock; Ordos Basin; Ordovician Majiagou Formation;
D O I：
10.11698/PED.2019.06.07
中图分类号：
学科分类号：
摘要：
The characteristics and formation of the pre-salt dolomite reservoirs in the fifth member of Ordovician Majiagou Formation in the mid-east Ordos Basin are investigated through observation of cores and thin sections, and geochemical analysis. (1) The pre-salt dolomites can be divided into dolomicrite, grain dolomite and dolarenite, in which the main reservoir space consists of intercrystalline pores and various dissolved pores. (2) The diagenesis in the study area is complex and mainly includes dolomitization, dissolution, filling, and recrystallization. (3) Multi-stages of dolomitization, including penecontemporaneous capillary concentration dolomitization, seepage- reflux dolomitization during penecontemporaneous and shallow burial stage, and burial dolomitization in later stage, are conducive to the preservation of primary pores and development of secondary pores. (4) Multi-stages of dissolution also have strong influence on the development of secondary pores; the secondary transgression and regression cycles during the contemporaneous-penecontemporaneous stage led to exposure and dissolution of soluble minerals and thus the generation of secondary pores. (5) In the burial stage, reservoir pores were further improved due to organic acid dissolution and the dissolution by hydrosulphuric acid from thermochemical sulfate reduction (TSR) and its product H2S. (6) High H2S concentration area in pre-salt reservoirs can thus be considered as targets for future exploration. © 2019, The Editorial Board of Petroleum Exploration and Development. All right reserved.
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页码：1087 / 1098
页数：11
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