Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 76-84.doi: 10.12108/yxyqc.20210408

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Quantitative evaluation of natural gas diffusion loss rate: A case study of Su-X block in Sulige gas field

LI Zhiyuan1, YANG Renchao1, ZHANG Ji2, WANG Yi2, YANG Tebo2, DONG Liang1   

  1. 1. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710071, China
  • Received:2020-11-25 Revised:2021-01-18 Online:2021-08-01 Published:2021-08-06

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Abstract: Natural gas diffusion loss rate is of great significance in quantitative evaluation of the impact of naturalgas diffusion on gas reservoir destruction. To obtain a relatively mature quantitative evaluation method,a geological model of natural gas diffusion of terrigenous clastic gas reservoir in Sulige gas field is established based on diffusion time,rock diffusion coefficient,concentration gradient,gas-bearing area and hydrocarbon expulsion intensity of source rock,and a set of quantitative evaluation method for natural gas diffusion loss rate of terrigenous clastic gas reservoir is formed. The research ideas are as follows： Firstly,the hydrocarbon generation intensity is calculated based on the data of source rock thickness and density,original organic carbon recovery coefficient,residual organic carbon content and gas hydrocarbon yield of original organic matter. Secondly,the hydrocarbon generation intensity is multiplied by the hydrocarbon expulsion coefficient to obtain the hydrocarbon expulsion intensity. Thirdly,according to Fick's first law,the formula for calculating the natural gas diffusion loss is derived,and the natural gas diffusion loss amount is calculated based on the formula,then the natural gas diffusion loss amount divide the gas-bearing area to obtain the natural gas diffusion loss intensity. Finally,the diffusion loss intensity of natural gas divide the hydrocarbon expulsion intensity of source rock to obtain the natural gas diffusion loss rate. Based on this calculation method,the gas diffusion loss rate of Su-X block in Sulige gas field is quantitatively evaluated. It is concluded that the gas diffusion loss rate in this area is mostly between 9.7% and 17.5%. The result shows that the natural gas diffusion loss rate is low and the diffusion loss of natural gas has little damage to gas reservoir. The results are in agreement with the geological reserves and development data of Sulige gas field,which indicate that the calculation method is suitable for the quantitative study of natural gas diffusion loss rate of terrigenous clastic gas reservoir.

Key words: gas reservoir, natural gas, diffusion loss rate, quantitative evaluation, hydrocarbon expulsion intensity, Sulige gas field, Ordos Basin

CLC Number: 

  • TE122.1
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