天然气有效储层下限确定方法

Method for determining the lower limits of effective reservoirs

通过Hobson方法计算临界喉道半径,利用孔隙度和临界喉道半径关系图确定储层和非储层的界线;再根据储层的划分级别及其所处气水界面以上位置,提出综合法来判断储层是否为天然气有效储层。将该方法应用于川东石炭系测井资料,结果表明该方法应用效果良好,具有一定的实用价值。

It is of importance to gas exploitation to determine the lower limits of effective reservoirs. The paper presents Hobson methods to calculate different fluids or gas pool hights under the critical porosity and throat radius. Reservoirs and non-reservoirs can be distinguished by the relationship of porosity and throat radius. Based on the reservoirs grades and their positions above water-gas boundary, a new synthetic method is proposed in this paper so as to determine whether a reservoir is effective or not. The result is good, and the method is valuable.