Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (4): 1060-1069.doi: 10.13278/j.cnki.jjuese.201704108

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Productivity Evaluation Method of Single Sand Body Gas Reservoir in Sebei-2 Biogenic Gas Field, Qaidam Basin

Tian Min1, Dong Chunmei1, Lin Chengyan1, Chai Xiaoying2, Wang Lijuan2   

  1. 1. School of Geoscience, China University of Petroleum, Qingdao 266580, Shandong, China;
    2. PetroChina Qinghai Oilfield Company, Jiuquan 736202, Gansu, China
  • Received:2016-10-16 Online:2017-07-26 Published:2017-07-26
  • Supported by:
    Supported by the National Science and Technology Major Project (2011ZX05009-003)

Abstract: The fine-grained reservoir in Sebei-2 gas field is interbedded by the thin sand-shale beach and bar facies with the characteristics of high porosity and moderate-lower permeability. Aim to evaluate the productivity of gas reservoir, the authors analyzed the connotation of gas productivity. Five geological parameters were selected, including porosity, permeability, gas saturation, effective thickness,and clay content;and their influences on gas productivity were clarified. A single sand body was taken as the basic unit, and the "apparent open flow potential", which eliminates the effect of production pressure drop, was applied as a comparative parameter in combination with the correlation analysis and the analytic hierarchy process (AHP). The weight of each parameter was determined. The threshold values of gas reservoir classification criteria were defined with regards to the actual productive requirement; on which the gas reservoirs were divided into 3 categories. The predicted distributions of gas reservoir productivity are coincident with the trend of the actual gas reservoir productivity. The distributions of the gas reservoir productivity are controlled not only by the gas abundance, the reservoir condition, and the original formation pressure, but also the interlayer quality and structure position. Vertically, the quantity of gas reservoirs increases upwardly and gradually, while the proportion of high level productive gas reservoirs reduces gradually; more gas reservoirs occur in the top gas layers than at the bottom within one group of reservoirs, and the productivity level of gas reservoirs at the top is lower than the ones at the bottom. Horizontally, the high level productive gas reservoirs are distributed in the central and high structural section, and the productivity level reduces gradually and transits to the edge of the plane. The research results can provide some references for a fine adjusting development plan so as to improve the enhanced field gas recovery. By this evaluation, the distribution of gas reservoir productivity can be predicted;and this, in turn, can provide support for optimization of a development plan.

Key words: single sand body, correlation analysis, analytic hierarchy process (AHP), productivity evaluation of gas reservoir, distribution characteristics, Qaidam basin

CLC Number: 

  • TE122
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