Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (6): 14-25.doi: 10.12108/yxyqc.20190602

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Distribution characteristics and controlling factors of movable fluid in tight sandstone gas reservoir: a case study of the eighth member of Xiashihezi Formation and the first member of Shanxi Formation in western Sulige Gas Field

LIU Na1, ZHOU Zhaohua2, REN Dazhong3,4, NAN Junxiang1, LIU Dengke4, DU Kun4   

  1. 1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. Langfang Branch of PetroChina Research Institute of Petroleum Exploration and Development, Langfang 065007, Hebei, China;
    3. Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi'an Shiyou University, Xi'an 710065, China;
    4. State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China
  • Received:2019-02-05 Revised:2019-05-20 Online:2019-11-21 Published:2019-09-28

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Abstract: The tight sandstone gas reservoir in Ordos Basin has great development potential. However,the existence of micro-nanopore structure increases the difficulty of fluid seepage and the development. The eighth member of Xiashihezi Formation(He 8)and the first member of Shanxi Formation(Shan 1)in the western of Sulige Gas Field were taken as an example to understand the distribution characteristics and controlling factors of movable fluid by using various experiments,including nuclear magnetic resonance(NMR),scanning electron microscopy(SEM),physical property tests and rate-controlled mercury intrusion(RCMI). The results show that:(1)The characteristics of the movable fluid distribution of He 8 and Shan 1 were different,and the average of the movable fluid saturation of the He 8 and Shan 1 sandstones was 48.75% and 23.64%,respectively.(2)The distribution characteristics of movable fluids of He 8 sandstone were controlled by physical properties and porethroat structure,and abundant seepage pathways and pores with relatively large radius led to the high movable fluid saturation,while that of Shan 1 sandstone were hard to be found due to the complex pore-throat network. (3)According to the comprehensive evaluation model,strong signal of residual and dissolved pores derived from NMR,high transitional radius and mercury saturation were the key factors of high movable fluid saturations. The research results clarify the controlling factors of movable fluids in different sections of tight sandstone gas reservoirs,and could provide a theoretical basis for predicting "sweet point" of tight sandstone gas reservoirs and play a guiding role in gas reservoir development.

Key words: tight sandstone gas reservoir, movable fluid, physical property, pore-throat structure, western Sulige Gas Field

CLC Number: 

  • TE122.2
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