缝洞型储层孔隙度指数的计算研究:基于改进前后的三孔隙度模型  

Study on the porosity exponent of fractured-vuggy reservoirs—based on triple porosity model before and after improvement

作　　者：田瀚[1] 李明[1] 杨敏[1] 兰锋[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《地球物理学进展》2015年第4期1779-1784,共6页Progress in Geophysics

基　　金：国家科技重大专项(2011ZX05004-003)资助

摘　　要：缝洞型储层的孔隙度指数、饱和度等参数的计算一直是测井界亟需解决的问题,它直接关系到储层流体性质、储量规模等方面的评价,前人在这些方面已经进行了大量的研究工作,也取得了一定的研究成果和应用效果,但仍需进一步加强认识.基于前人提出的改进前后的三孔隙度模型,对比研究了缝洞型储层孔隙度指数的变化规律.研究结果表明缝洞型储层的基质孔隙度、裂缝孔隙度、非连通缝洞孔隙度及基质孔隙度指数均对复合系统孔隙度指数有着明显的影响,且各个因素对其影响的效果和程度不同.通过分析改进前后的三孔隙度模型可以看出,两种模型求取的孔隙度指数是存在着明显差异的,而孔隙度指数的变化对准确求取饱和度有着很大的影响,并且发现利用改进后的三孔隙度模型求得的孔隙度指数和饱和度更加符合实际情况.The calculation of porosity exponent and saturation for fractured-vuggy reservoirs has always been an imperative problem to be solved.It directly affects the evaluation of fluid properties,reserves scale and other aspects.Predecessors have done a lot of research in these areas,and have gained some research achievements and application effect, but present understanding still need to be further enhanced.A comparison study on the variation feature of porosity exponent of fracturedvuggy reservoirs is conducted on basis of triple porosity model before and after improvement.The result shows that matrix porosity,fracture porosity, non-connected fractured-vuggy porosity and matrix porosity exponent all have obvious effect on the porosity exponent of composite system,and each of the factors performs different effect and extent on it.The analysis of the triple porosity model before and after improvement indicates that the porosity exponents calculated by the two models have obvious difference,and the variation of porosity exponent greatly influences the accuracy of calculating saturation.It also finds that the values of porosity exponent and saturation calculated by improved triple porosity model are more in line with actual situations.

关 键 词：缝洞型储层 三孔隙度模型 孔隙度指数 饱和度 

分 类 号：P631[天文地球—地质矿产勘探]