Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (4): 43-50.doi: 10.3969/j.issn.1673-8926.2016.04.007

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Characteristics and genesis of tight sandstone reservoir of Shanxi Formation in Linxing area, Ordos Basin

Zhao Da 1，2，Xu Hao 1，2，Wang Lei 3，Tang Dazhen 1，2，Meng Shangzhi 4，Li Ling 1，2   

  1. 1. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism，Ministry of Education，China University of Geosciences（Beijing），Beijing 100083，China；2. Key Laboratory of Shale Gas Exploration and Evaluation，Ministry of Land and Resoueces，China University of Geosciences（Beijing），Beijing 100083，China；3. Exploration Company， Sinopec，Chengdu 610041，China；4. China United Coalbed Methane Company Ltd.，Beijing 100011，China
  • Online:2016-07-20 Published:2016-07-20

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Abstract:

Linxing area in Ordos Basin has great potential of natural gas exploration and development, so it is an important succeeding area for tight sandstone gas exploration. Due to the poor physical properties of tight sandstone reservoir and complex genesis of tight reservoir, the industrial development of tight sandstone gas in this area is restricted. Based on the data of X?ray diffraction, scanning electron microscope, cathodoluminescence, cast thin section, fluid inclusions and laboratory test, the characteristics and genesis of tight sandstone reservoirs of Shanxi Formation in Lingxing area were studied. The result shows that the sandstone reservoirs are mainly litharenite and sub ? litharenite, and the pore types are mainly primary intergranular pores and secondary dissolved pores. The reservoir physical pro?perties are poor, with the average reservoir porosity of 5.9% and the average permeability of 0.073 mD. Both the disp?lacement pressure and the median saturation pressure are high. The pore throat radius is small and the sorting is poor. The diagenetic sequence of tight sandstone reservoir is divided into four generations of clay filling, which makes the reservoir tight. The quantitative analysis of porosity evolution shows that reservoir quality in the study area is mainly affected by compaction and cementation. The porosity loss due to the compaction is 17.1% at the early diagenetic stage, and the porosity loss due to the compaction and cementation is 22.9% at the middle diagenetic stage. In cementation, a large number of clay minerals filled the pores and clogged the throat,which makes the primary intergranular pores become tiny intercrystalline pores. In addition, it makes the pore surface rough and increases the detour degrees, resulting in the reservoir porosity and permeability greatly reduced.

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