碳酸盐岩缝洞型油藏描述与储量计算

Description and reserves calculation of fractured- vuggy carbonate reservoirs

碳酸盐岩缝洞型油藏的描述难度极大。以塔里木盆地塔河油田为例,应用系统层次化的研究方法,将多种缝洞组合、多种油水关系、多套压力系统的复杂油藏,分解成缝洞成因相似、压力系统相同的若干缝洞单元,形成了动、静相结合的缝洞单元综合评价方法以及"平面分单元、分储集类型、纵向分段"的体积法储量计算和储量分类评价方法。目前该方法在塔河油田开发实践中应用效果较好,已推广应用到整个塔里木盆地的碳酸盐岩油气开发和缝洞型油藏描述中。该方法对非常规油藏也具有一定的指导意义,主要是依托高精度三维地震、钻井和动态资料,进一步提高非常规油藏的描述精度。

It is extremely difficult to describe fractured-vuggy carbonate reservoirs. Taking the Tahe Oil Field as an example and using hierarchy system research, the complicated petroleum reservoirs, which have multi-fracture-vug complex, multi-water-oil relationship and multi-pressure system, have been divided into many fracture-vug units that have similar causes of formation and mutual pressure system. The comprehensive evaluation method using dynamic and quiescent data and the reserve volume classification and evaluation methods have been formed. And the typical reserves calculation method, named cubic capacity method, subdivides planar fracture-vug units, reservoir types and vertical sections. These methods have acquired good effects in development practices in the Tahe Oil Field, and have been introduced and applied to the whole carbonate development of the Tarim Basin. They also have fine guidance to other non-conventional reservoirs. Nevertheless it is necessary to enhance the fineness of reservoir description depending on fine 3D seismic data, well drilling and dynamic data.