Discussion on Gas-water Transition Zone and Accumulation Closure Limit:A Case of Gas Reservoir in High Temperature and High Pressure Belts of Yinggehai Basin
Received date: 2015-02-16
Revised date: 2015-04-12
Online published: 2015-12-10
The reservoir physical property and pore structures not only control the gas saturation of a gas reservoir,but also influence the scale of the gas-water transition zone.However,whether there is a quantitative relationship between them and whether we can predict it effectively are unknown.But it is of significance to the trap evaluation and gas exploration.In this paper,based on the research of semipermeable partition experiment,reservoir physical properties and interlayers,combined with the analysis of the actual geological data in Yinggehai Basin,the method to predict the thickness of the gas-water transition zone and the concept of the accumulation closure limit are proposed.The research results show that there are good correlations between the thickness of gas-water transition zone and reservoir physical properties (especially permeability).It suggests that the reservoir pore structure is the main factor to control the thickness of gas-water transition zone,and the interlayers also affect the distribution of gas-water transition zones.Furthermore,the trap closure limit is 7m,and economic accumulation closure limit is 12m in mid-deep strata of Yinggehai Basin.
WU Hong-zhu,HUANG Zhi-long,TONG Chuan-xin,HUANG Bao-jia,LIU Ping,WEI Guo . Discussion on Gas-water Transition Zone and Accumulation Closure Limit:A Case of Gas Reservoir in High Temperature and High Pressure Belts of Yinggehai Basin[J]. Natural Gas Geoscience, 2015 , 26(12) : 2304 -2314 . DOI: 10.11764/j.issn.1672-1926.2015.12.2304
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