缝洞型火成岩油藏注水提高采收率研究

火成岩油藏受裂缝发育影响，注水提高采收率效果不佳，针对该问题，通过建立火成岩岩相模型，基于岩心、测井及地震多尺度裂缝描述的裂缝模型，采用“岩相展布+裂缝模型”双重约束，建立高精度缝洞双重介质地质模型，准确描述储层与裂缝分布。以此为基础结合渗流规律，利用机理模型流线模拟指导注采井网设计，再利用三维数值仿真模拟进一步优化注水开发方案，形成一套缝洞型火成岩油藏注水开发方案优化设计方法。研究成果应用于大港枣园油田枣1508区块，现场初步实施后，稳产期超过1.5a、综合含水维持在5%，采收率预计提高10个百分点以上。研究成果对类似火成岩油藏效益开发具有重要借鉴意义。

Enhancing Oil Recovery by Waterflooding in Fracture-Cave Igneous Reservoir

A igneous lithofacies model was established to improve the low efficiency of waterflooding in the igneous reservoir results from fracture.Based on the fracture model with multi-scale characterizations from core,logging and seismic data,the“lithofacies distribution+fracture model”dual constraints was used to establish a high-precision fracture-cave dual-medium geological model to characterize the reservoir fracture distribution.The conceptual streamline simulation model was carried out to design the well pattern by combining with flow mechanism.The 3D numerical simulation was used to further optimize the waterflooding pr ogram,which presents a set of waterflooding development optimization methods for the fracture-cave igneous reservoir.This research was applied to the Block Zao1508 of Zaoyuan Oilfield in Dagang Oilfield.The stable production period exceeds 1.5 a after implementation,the comprehensive water-cut is maintained at 5%,and the recovery factor is expected to be increased by more than 10 percentage points.It could provide certain references for the efficient development of similar igneous reservoirs.