低渗砂岩储层岩石学特征与应力敏感性耦合关系——以鄂尔多斯盆地苏里格-吉尔地区下石盒子组八段下亚段为例

doi:10.11743/ogg20120614

Abstract

Abstract:

Low-permeability reservoirs are usually developed through natural depletion and the loss of formation pressure is not restored,causing stress sensitivity of reservoirs.We chose the lower 8^th member of the Lower Shihezi Formation in Sulige-Jier area,the Ordos Basin as a case study.Through downhole geological survey,core observation,systematic sampling and testing,and lab correlation and analysis,we studied the coupling relation between the petrologic characteristics and stress-sensitivity and found out that the rock types of the layers of interest are mainly lithic quartz sandstone,followed by siliceous quartz sandstone and small amount of lithic sandstone.The samples were tested with model CMS-400 high-pressure porosity and permeability analyzer.The initial permeability was low and stress-sensitivity was medium to strong and the two presented an obvious positive correlation.Among the rock components,the soft debris and matrix that have low hardness and stability are easily deformed,crushed and displaced under exogenic action.Their contents have positive correlations with the stress-sensitivity.Detrital quartz,rigid debris and cements such asquartz and daphnite have higher hardness and stability and remain stable under exogenic action.And their contents have negative correlations with stress-sensitivity.Different rocks have various stress-sensitivities because of their different petrologic characteristics.During the development of oilfields,we suggest to optimize deliverability by using production pressure differentials at different levels.

Key words: petrologic characteristics, stress-sensitivity, coupling relationship, low-permeability reservoir, Sulige gasfield, Ordos Basin

CLC Number:

TE122.1

He Jiang, Fu Yonglei, Shen Guichuan, Zhu Xiaoyan, Wu Qilin. Coupling relations between the petrologic characteristics and stress-sensitiveness in low-permeability sandstone reservoirs:an example from the lower 8^th member of the Lower Shihezi Formation in Sulige-Jier area,Ordos Basin[J]. Oil & Gas Geology, 2012, 33(6): 923-931.

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Coupling relations between the petrologic characteristics and stress-sensitiveness in low-permeability sandstone reservoirs:an example from the lower 8^th member of the Lower Shihezi Formation in Sulige-Jier area,Ordos Basin

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Coupling relations between the petrologic characteristics and stress-sensitiveness in low-permeability sandstone reservoirs:an example from the lower 8th member of the Lower Shihezi Formation in Sulige-Jier area,Ordos Basin

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Coupling relations between the petrologic characteristics and stress-sensitiveness in low-permeability sandstone reservoirs:an example from the lower 8^th member of the Lower Shihezi Formation in Sulige-Jier area,Ordos Basin