高含水油田井震联合重构地下认识体系

Reconstruction of underground recognition system based on both seismic data and well data in a mature oilfield with high water cut

从高含水油田二次开发需求的角度,将高含水油田重构地下认识体系划分为重构地下构造认识体系、重构地下储层认识体系和重构地下流体认识体系,并提出了相对应的井震联合研究方法———以井上断点数据指示和引导的地震资料小断层识别和解释方法;以地震标准层解释数据为约束的微幅度构造成图方法;以地质小层约束和随机地震反演为特色的高精度薄互层地震储层预测方法;以地震解释的断层、构造和储层预测成果为约束的地震约束储层地质建模方法;以地震约束建立的高精度储层地质模型为基础的油藏数值模拟分层历史拟合小层剩余油预测方法。以在我国东部Z油田的应用为例,综合发挥井震资料分别在纵横向具有密集采样的优势,在开展井震联合攻关对断层、微幅度构造、单砂体横向边界和剩余油分布等方面取得新认识的基础上,重构了研究区地下新的认识体系。

Based on the redevelopment requirement of oilfield with high water cut,the reconstruction of underground recognition system which can be divided into three sub-systems:the reconstruction of underground structure recognition sub-system,the reconstruction of underground reservoir recognition sub-system and the reconstruction of underground fluid recognition sub-system.In this paper,a series of methods are proposed including small-scale fault seismic identification and interpretation method based on breakpoint data of wells,micro structure mapping method confined by reference lamina,alternate thin beds reservoir prediction method based on geological layers constrain and stochastic inversion,geological modeling method constrained by fault,structure and reservoir prediction,remaining oil prediction method based on high quality layer history matching.These methods are applied in a mature oilfield.New recognition on fault,micro structure,single sand body boundary and remaining oil distribution is achieved.