利用多级相控-多点统计法建立碳酸盐岩缝洞储层地质模型

Geological modeling of carbonate karst fracture-cavity reservoir by the multilevel facies conditioning & multi-point geostatistics method

塔河油田碳酸盐岩缝洞型油藏储层的空间展布规律性差,非均值性极强,储层发育主要受控于断裂、构造、岩溶水系。塔河油田T739条带,井区岩溶主要受控于断裂,纵向上多套储层发育,油气主要富集在表层两套储层。首先,利用地震、地质、测井、完井测试等资料,进行纵向上储层分段,建立构造模型。其次,借鉴多级相控的思路,将不同地震属性融合预测岩溶发育有利区域,建立岩溶发育区域模型;在岩溶优势发育区域模型的严格约束下,分析溶洞、裂缝类岩溶相的形成的叠置规律,通过训练图形确定岩溶相模式,采用多点统计法建立储层相模型。最后,在储层相模型的基础上,利用序贯高斯方法建立物性模型。

Carbonate fracture cavity reservoir of Tahe oilfield possesses extremely strong heterogeneity and randomness. The res ervoir is mainly controlled by the Karstifieation of fault, structure and river systems. Taking the T739 region as an example, it is domi nant in fault. The multiple sets reservoir develop on longitudinal, and the hydrocarbon is mainly enriched in two sets of reservoir in sur face level. Firstly,The vertical karst zoning is created by seismic, geology, logging testing ere, and establish the construction model. Secondly, based on the multilevel facies conditioning method, the karst favorable area of development is predicted by different seismic at tributes, and the karst development regional model is created. Under the strict restriction of the karst development regional model, a nalysis of the formation of cave and fracture karst phase, the training image model confirm geometry characteristic, and the 3D karst phase modes are established by multi -point geostatistical. Finally, the petrophysical model is created by sequential Gaussian method.