Forming mechanism and main controlling factors on the high-quality gas reservoirs restricted by paleokarst background:A case from Ordovician M54 1 carbonate,Ordos Basin

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  • 1.National Engineering Laboratory of Exploration and Development on Low Permeability Oil & Gas Field,
    Xi’an 710018,China;2.Key Laboratory of Petroleum Resources Research,Gansu Province/ Key Laboratory
    of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,
    Lanzhou 730000,China;3.University of Chinese Academy of Sciences,Beijing 100049,China

Received date: 2016-02-26

  Revised date: 2016-09-10

  Online published: 2019-09-06

Abstract

The karst palaeogeomorphology from west to east showing karst highland,karst slope and karst basin has laid the foundation for the formation of high-quality Ordovician reservoir in Ordos Basin.The study area experienced three types of karstification including contemporaneous interlayer karst,shallow burial weathering karst and burial karst to form lots of various pores and holes which provide the basis for later diagenetic alteration.M541 sublayer reservoirs mainly developed micrite dolostone,including anhydrite tuberculosis micrite dolostone,gypsum-containing dolostone,gypsum rock and karst breccias.Four kinds of reservoir spaces such as dissolution hole,primary intergranular pore,intergranular solution pores and microcracks are frequently observed with the dolostone reservoir.Gypsum dissolution mold pore is the main reservoir space.Based on field geological section,core description and thin sections,combined with cathodoluminescence,X-ray diffraction,and scanning electron microscopy analysis,it can be seen that the high-quality reservoir development in the study area is mainly controlled by two factors: karst palaeogeomorphology and late diagenetic dissolution.The former controlled reservoir distribution,physical property,gas and water distribution within the reservoir,so it is the basic condition to form the high-quality reservoir.And the latter reformed the pore system produced during karstification through three-periods of diagenetic dissolution.Therefore,the superimposition of these two geological processes is the key to the formation of high quality reservoirs in the study area.

Cite this article

Wang Qi, Xu Yong, Liu Xin-she, Ma Dong-xu, Ma Xiao-feng, Li Shu-tong . Forming mechanism and main controlling factors on the high-quality gas reservoirs restricted by paleokarst background:A case from Ordovician M54 1 carbonate,Ordos Basin[J]. Natural Gas Geoscience, 2016 , 27(12) : 2103 -2114 . DOI: 10.11764/j.issn.1672-1926.2016.12.2103

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