基于储层地质知识库的井震结合河道刻画方法——以松辽盆地北部F地区葡萄花油层组为例

A Method of Channel Description by Well and Seismic Data Based on Geological Knowledge Database ——By Taking Putaohua Reservoir of F Area in the North Songliao Basin for Example

针对探评区小层级河道微相不能准确刻画的难题,提出了"区块精细解剖建知识库,知识库参数约束井震结合"的河道微相精细刻画方法。以松辽盆地北部F地区葡萄花油层组为例,对区内密井网开发区小层级沉积微相进行解剖,并统计河道微相的宽度、厚度、延伸方向、分叉角等参数,建立储层定量地质知识库。在精细地质研究的基础上,利用地震沉积学的地层切片技术提取地震属性,建立地震属性与井点砂岩厚度的关系,用以预测探评区的砂岩厚度。最后,综合运用地质知识库参数和预测的砂岩厚度对平面沉积微相进行刻画,指导了探评区井位的成功部署,为探评区深入应用井-震资料进行沉积微相精细刻画提供了一种新思路,可在类似区块推广应用。

In order to solve the problem of channel microfacies accurate description in the exploration assessment areas,a new method for small block description was proposed for establishing a reservoir geological knowledge database and accurate description of sedimentary microfacies by using the combination of well and seismic data under the constraint of knowledge database.By taking Putaohua Reservoir of F Area in the northern Songliao Basin for example,the sedimentary microfacies in the area was analyzed and the channel microfacies,thickness,width of the extension direction,bifurcation angle data of dense well pattern were statistically studied to establish a quantitative reservoir geological knowledge database.On the basis of fine geology research,seismic attributes were extracted by using the strata slice technology of the seismic sedimentology,and the statistical relationship between the seismic attributes and sandstone thickness in wells was established to predict the thickness of sandstone in the exploration assessment areas.The parameters in the geological knowledge database and the predicted sandstone thickness are comprehensively used to describe the plane sedimentary microfacies and successfully guide arrangement of well locations in the exploration area,it provides an idea for accurate description of sedimentary microfacies by using the combination of well and seismic data in the area,the technology can be popularized in the similar areas.