应用偏相关+灰关联方法进行致密砂岩气藏压裂地质选层

Application of partial and grey correlation methods to layer selection for fracturing in tight sand gas reservoirs

谢润成 周文 高雅琴 郭新江 葛善良 张凌子

Xie Runcheng Zhou Wen Gao Yanqin Guo Xinjiang Ge Shanliang Zhang Linzi

压裂选层需要考虑的因素多而复杂,并且具有高度非线性特征,选层时除了利用经验类比外,还需要运用非线性数学理论才可能满足现场需要。通过对现有备种方法的对比分析,建立了偏相关+灰关联压裂地质选层方法。依靠提取待压层段有效厚度、孔隙度、地应力差及顶底隔层平均厚度等14项特征参数进行的优选压裂层段的偏相关+灰色关联度计算,其结果与现场压裂测试结果对比表明,该方法计算简单快速,结果可靠,并对于同类型气藏的压裂评井选层具有一定的借鉴意义。

Layer selection for fracturing requires thorough consideration of many factors,which represent clear nonlinear characteristics.In addition to empirical analogy methods,nonlinear mathematical theories are also nee-ded to meet the requirements of fracturing operation.A geological optimization method consisting of partial and grey correlation for selecting layers for fracturing operation has been established after an analysis of all available layer selection methods.Fourteen parameters(such as net thickness,porosity and stress difference of layers to be fractured,and the average thickness of top and bottom barriers) are involved in the application of the method. The calculation result shows a good coincidence with that of in-site fracturing test.The method features in easy and fast calculation and yielding reliable results,and therefore can be used as reference in well evaluation and layer selection for fracturing in the same types of gas reservoirs.

10.11743/ogg20080614