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Main controlling factors of low production of tight sandstone gas of Permian Shanxi Formation in the Shenmu block,eastern Ordos Basin,China

Wang Feng1,2   

  1. 1.Research Institute of Petroleum Exploration and Development,SINOPEC,Beijing 100083,China;
    2.SINOPEC Exploration and Production Department,Beijing 100728,China
  • Received:2016-09-13 Revised:2017-03-27 Online:2017-05-10 Published:2017-05-10

Abstract:

Permian Shanxi Formationhas become the new gas producing strata of tight sandstone after Taiyuan Formation.Effective exploration and development of tight sandstone gas of Shanxi Formation is restricted by the features of low single well production,low degree of exploration and insufficient recognition.The reasons and the main controlling factors of low production of tight sandstone gas have been analyzed with different kinds of technologies including casting thin sections,physical property analysis,nuclear magnetic resonance and so on.The reason of low production of tight sandstone gas is that the tight sandstone reservoir has the features of low porosity,low permeability,complex pore structure,strong stress sensitivity and ultra-low water saturation.Ultra-low water saturation is the phenomenon that bound water is greater than initial water saturation,which will cause poor reservoir seepage and is easy to form water block.The main controlling factors of low production of tight sandstone gas are sedimentary heterogeneity and the destructive diagenesis,because they decrease the reservoir property greatly and block the gas supply.This study provides a significant reasonable geological basis for the reservoir fracturing process,the improvement of single well production and the effective development of tight sandstone gas.

Key words: Tight sandstone gas, Low production reasons, Main controlling factors, Shanxi Formation, Shenmu block

CLC Number: 

  • P631.4

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