Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (3): 674-684.doi: 10.13278/j.cnki.jjuese.201703103

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Study on Dynamics and Models of Hydrocarbon Accumulations of Tight Sandstone Gas Reservoir: Taking Shan 1 Formation of Block L in Ordos Basin as an Example

Pang Zhenyu1, Zhao Xisen1, Sun Wei2, Dang Hailong1, Ren Dazhong2, Xie Wei1   

  1. 1. Research Institute of Shaanxi Yanchang Petroleum (Group) Co.,Ltd, Xi'an 710075, China;
    2. Department of Geology, Northwest University, Xi'an 710069, China
  • Received:2016-08-31 Online:2017-05-26 Published:2017-05-26
  • Supported by:
    Supported by Shaanxi Province Science and Technology Entire Innovation Plan Foundation (2014KTZB03-02) and National Science and Technology Major Project (2011ZX05044)

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Abstract: Shan 1 Formation in the study area belongs to tight gas reservoir. In order to understand the formation mechanism of effective reservoir, and to find the favorable area for exploration and development, the authors carry out a research on the accumulation dynamics and the accumulation model through application of casting thin sections, scanning electron microscopy, nuclear magnetic resonance (NMR), and constant speed mercury injection experiment, etc.. The results show that: The Early Cretaceous is the main period for gas accumulation, the pore-throat radius of water sealed gas molecules is 0.093 μm,the pore-throat radius cutoff of gas filling is 0.25 μm, and the maximum capillary resistance of gas filling is 1.16 MPa; The fluid overpressure in tight sandstone gas reservoir is the main force and resistance of gas migration; Natural gas is mainly gathered in a low overpressune area under high overpressure background; The area whih overpressure less than 6 MPa is advantageous for gas gathering,and the smaller the density and the thickness of isolation layers are, the higher their saturation is; There are four gas filling patterns in the study area. Coal seam with large thickness of continuous development, optimal overall characteristics of reservoir, pressure difference between source bed and reservoir, interlayer and overpressure are beneficial to preserve natural gas, which become "sweet spots" of the development of natural gas.

Key words: tight gas reservoir, filling limit, nuclear magnetic resonance, charging dynamic, overpressure, charging pattern

CLC Number: 

  • P618.13
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