一种新的基于孔隙结构的碳酸盐岩孔隙度反演方法在川东地区的应用  

A New Porosity Inversion Method for Carbonate Reservoir Based on Pore Geometry Applied in East Sichuan

作　　者：刘开元 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室成都理工大学地球物理学院,成都610059

出　　处：《科学技术与工程》2013年第33期9802-9807,共6页Science Technology and Engineering

基　　金：国家自然科学基金项目(41174114)资助

摘　　要：众多学者已经证实碳酸盐岩储层的弹性性质受到孔隙结构的影响非常大,因此在反演孔隙度的时候也应该考虑孔隙结构对于地震的影响。通过对著名的Gassmann方程及Eshelby-Walsh椭球包体裂缝理论的研究及分析,结合两个方程,推导出一个考虑岩石孔隙结构并利用地震资料反演孔隙度的新方法。提出了新方法的流程和所有参数的求取方法;并对实际的试验工区进行孔隙度预测。预测结果和测井数据吻合度很高,说明该方法对于孔隙度预测的适应性和实用性。该方法适用于碳酸盐岩储层孔隙度的反演,是因为碳酸盐岩的刚度大,体积模量相对于其他岩性的体积模量大很多;并且岩石孔隙流体的压缩系数远大于岩石基质的压缩系数,储层深度大尤为明显,对于推导新方法过程中的近似更可靠。The Gassmann＇well-known equation combined with Eshellby-Walsh elhpsoidal inclusion theory to considethe pore geometry to inverse porosity ianalyzed which habeen proved thathe compressional wave velocity influenced by the pore geometry greatly in carbonate reservoirs. And an approximate form igoto Gas- smann＇ equation to propose new method to inverse porosity suitable focarbonate reservoirafteanalyzing the suitable approximate and replacemenof the coefficients. working flow foinversing porosity, and also the calcu- lating method of all parameterfothe inversion iproposed. real survey datiused to prove the applicability of the method and geconclusion thathe method isuitable fopredicting the porosity focarbonate reservoirwith high accuracy.Thimethod isuitable fopredicting the porosity of carbonate reservoirbecause the bulk moduluof carbon- ate rock imuch biggethan otherocklike sandstoneand so on, especially in the deep depth, where can resulin high-pressure compaction, and where the compressibility of dry rock imuch smallethan the rock pore fluid＇ s.

关 键 词：孔隙度反演 GASSMANN方程 压缩系数 碳酸盐岩储层 孔隙结构 

分 类 号：TE121.32[石油与天然气工程—油气勘探]