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本文提出了凹型压力恢复曲线的一阶导数图版和二阶导数图版。综合使用这两种导数图版,提高了匹配的精度,使匹配结果准确。无量纲起始压力梯度D很难确定。本文提出的两种导数图版综合匹配法能准确确定D值,是致密储层动态评价的有效工具。

Derivative Plate of Concave Pressure Build-up Curve and Its Application to Tight Gas Reservoir

The first and second derivative plates of concave pressure build-up curve are presented in this paper. Synthetical use of the two derivative plates can raise the match precision and make the matched results exact. The determination of demensionless start pressure gradient D is very difficult, but the synthetical match method of the two derivative plates presented by the author has solved such a difficult problem, which can determine value D exactly and is a good measure for the performance evaluation of tight reservoirs.