Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (3): 58-67.doi: 10.3969/j.issn.1673-8926.2016.03.009

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Characteristics and evolution of the Ordovician dolomite reservoir of Ma 5 member in Fuxian area, Ordos Basin

Li Wei1，2， Zhang Juntao3， Zhu Xiaomin2， Sun Yipu3， Li Shujun3

  

  1. 1. Research Institute of Exploration and Development ， Sinopec Jiangsu Oilfield Company ， Yangzhou 225009 ， Jiangsu ， China ；2. College of Geosciences ， China University of Petroleum ， Beijing 102249 ， China ； 3. Sinopec Research Institute of Petroleum Exploration and Production ， Beijing 100083 ， China
  • Online:2016-05-20 Published:2016-05-20

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Abstract:

There is a set of weathering crust reservoir developed in Majiagou Formation in Ordos Basin. Based on experimental analyses of cores, thin section examination, cathodoluminescence, electronic probe, carbon and oxygen isotope, and physical property, the characteristics and evolution of weathering crust reservoir in Fuxian area were studied. The result shows that gypsum and anhydrite mainly occurred as isolated nodules in Ma 5 penecontem poraneous dolomite in Fuxian area. These nodules were dissolved by meteoric water during Caledonian and experienced other diagenesis after buried, which forms the most significant reservoir spaces with diversiform filling degree and types. Sedimentary facies affects the porosity directly by controlling the size and quantity of nodules,and it could affect the reservoir permeability indirectly as the small quantity of nodules is not beneficial to the development of micro cracks among pores （ Anhydrite would dilate when absorbing water and increase formation pressure, and the pressure would decrease after the nodules were dissolved, which then generated micro cracks ） Reservoir properties are principally determined by epidiagenesis. Gypsum was dissolved by meteoric water and pores formed during that period, and the pores located in the lower part of paleo-landform generally suffered totally filling of calcite. The effect of burial diagenesis on reservoirs in the study area is fairly weaker than that on the samereservoirs in the Central Gas Field of Ordos Basin. The formation mechanism of highquality reservoirs was defined,and it is considered that favorable reservoirs are mainly located in overlapped areas between gypsum-bearingdolomite flat and paleohigh of karst geomorphology. Fine description about sedimentary facies and karst geomor-phology should be the key for the further reservoir prediction.

Key words: shale gas, mineral composition, organic carbon, reservoir space, tectonic preservation, Longmaxi Formation, Da’anzhai member

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