Experimental simulation of gas accumulation mechanism in sandstone reservoir: A case study of Sulige gas field, Ordos basin
XU Xuan
HU Yong
SHAO Longyi
WANG Jiping
CHEN Yingli
JIAO Chunyan
Abstract：Considering low filling velocity and different temperature,physical experiments of gas charging were carried out.Using about 42 matrix cores samples from Sulige gas field,these experiments were put into practice with filling power increase gradually.Based on these experiments,we studied three key factors on reservoirs accumulation:reservoir property,filling power and charging temperature,analyzed the mechanism of gas and water production during charging process,and found out that the gas-bearing capacity has a positive correlation with reservoir quality and filling power,which are in a very good logarithmic function relationship.The study shows that the threshold pressure of hydrocarbon accumulation exists in the low-permeability tight sandstone reservoir.The 0.10 mD and 0.01 mD reservoirs have threshold pressures over 2.0 MPa and 10.0 MPa.The pressure of hydrocarbon source and reservoir need an equilibrium process.The lower permeability has higher threshold pressure,slower equilibri um process and higher equilibrium pressure at last.The threshold pressure and equilibrium pressure are inflection points of the hydrocarbon content.They divide the filling process into three different stages:critical filling stage,quick increasing stage and gentle increasing stage.The rising velocity and range of gas saturation,as well as the water yielding pore are different in different stages.Under the same reservoir and filling dynamic conditions,the gas-bearing capacity would rise 5 ％-10 ％ with the increasing of temperature.
Keywords：sandstone reservoiraccumulation mechanismcharging physical modelingsource and reservoir pressuregas-bearing capacitySulige gas field
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1323-1331,1339 )