论文部分内容阅读
碳酸盐岩缝洞型油藏受古地貌、构造及岩溶作用控制,储集体类型多样,主要以不同类型的大尺度溶洞、小尺度孔洞及多尺度裂缝为主,储集体成因机制不同,高度离散,传统连续性储层表征思路难以直接套用。以储集体识别和描述为基础,基于分类表征的思想对不同类型储集体分别进行刻画。以岩溶成因及野外露头为指导,综合地震定性预测与定量反演成果,对于风化壳成因、断控成因的大尺度溶洞分别采用序贯指示方法和基于目标的方法进行模拟。对于小尺度孔洞采用协同序贯指示模拟方法建模,对于多尺度裂缝则以地震信息为基础,采用人工解释、蚂蚁追踪与随机模拟相结合的方法进行表征。在分类表征基础上,根据岩溶成因规律构建分类储集体的融合原则,实现了分类模型的整合。结果表明:该方法能够有效表征S80单元缝洞型油藏的强非均质性特征,基于模型细化评价单元储量级别,设计新钻井位置,筛选有利目标区均取得较好效果,模型应用于油藏数值模拟,为指导剩余油挖潜与开发方案调整奠定地质基础。
The carbonate fractured-cave reservoirs are dominated by paleogeomorphology, tectonics and karstification, with various types of reservoirs. The major types of reservoirs are mainly large-scale karst caves, small-scale pores and multi-scale fractures. The genetic mechanism of the reservoirs is different. The height Discrete, the traditional continuous reservoir characterization ideas difficult to apply directly. Based on the identification and description of the reservoirs, different types of reservoirs are respectively described based on the idea of classification and characterization. Guided by karstification and outcrops, the qualitative prediction and quantitative inversion results of seismic are integrated. Large-scale karst caves with genesis and origin of weathering crust are simulated by sequential indicator method and target-based method respectively. For small-scale holes, a coordinated sequential indicator simulation method is used for modeling. For multi-scale fractures, the seismic information is used as the basis for the analysis, and artificial interpretation, ant tracking and stochastic simulation are used to characterize the multi-scale cracks. On the basis of classification and characterization, the principle of karst causality is used to construct the principle of fusion of classification and accumulation, and the integration of classification model is realized. The results show that this method can effectively characterize the strong heterogeneity of the S80 unit fractured-vuggy reservoirs, evaluate the unit reserves level based on model refinement, design new drilling locations and select favorable target zones. The model is applied to Reservoir numerical simulation, in order to guide the remaining oil tapping potential and development program to lay the geological foundation for adjustment.