基于地震的碳酸盐岩双重介质建模技术及应用

Research and application of dual media modeling of carbonate rock based on seismic data

碳酸盐岩气藏裂缝孔隙型储层非均质性强,裂缝复杂,仅依靠井资料和随机模拟的三维地质建模无法准确描述储层以及裂缝特征,数值模拟历史拟合误差大,无法进行有效的流体动态分布预测。以土库曼斯坦阿姆河右岸S气田群为例,提出基于地震的复杂碳酸盐岩双重介质建模技术,利用多级相控反演礁滩体内幕储层技术对基质模型进行约束,利用地震多属性融合裂缝预测技术对裂缝模型进行约束,精细表征了碳酸盐岩储层非均质性特征及裂缝分布特征,提高了复杂碳酸盐岩建模精度,提升了数值模拟预测的准确性。同时,利用双重介质模型和数值模拟对储层连通性开展了有效评价,准确判断了水源方向,为后期开发方案的制定提供了有效信息。

Fracture-pore type carbonate reservoir has strong heterogeneity and complicated fracture development.The 3D geological modeling relying only on well data and random simulation can not accurately describe reservoir and fracture characteristics,and the historical fitting error of numerical simulation is large,which can not effectively predict the fluid dynamic distribution.In this study,gas fields S on the right bank of the Amu Darya River in Turk-menistan are taken as an example,and a dual media modeling of complex carbonate rock based on seismic data is pro-posed.The matrix model is constrained by multistage facies control inversion of the inner reservoir of reef shoals,and the multi-attribute fusion fracture prediction technique is used to constrain the fracture model.The reservoir heterogeneity and fracture distribution of the carbonate reservoir are characterized in detail,and the modeling accuracy of complex carbonate rocks is improved.The accuracy of numerical simulation prediction is improved.At the same time,the dual media model and numerical simulation are used to effectively evaluate the reservoir connectivity,accurately judge the direction of the water source,and provide effective information for the formulation of the subsequent development plan.