面向断裂破碎带储层的“双等时”格架约束地震预测方法

面向超深层(8000~9500m)断裂破碎带非均质储层的勘探, 有效揭示断裂破碎带内部非均质储层特征有着重要意义。当前的储层反演技术方法通常采用等时沉积格架约束, 无法体现断裂破碎体系空间展布的特征。为此, 提出面向断裂破碎带储层的“双等时”格架约束地震预测方法。首先, 基于地震资料分析并提取断裂破碎非均质信息, 再构建地层等时沉积和断裂活动等时破碎的“双等时”格架, 利用此格架约束反演过程, 实现地质研究成果与地震反演迭代计算的有机融合, 最终获取断控储层预测结果, 实现超深层复杂断控储层的定量预测。模型正演结果表明, 断裂破碎带内部储层的识别率达到98.1%, 与常规稀疏脉冲反演结果相比增加了87.05%。实际应用表明, 所提的“双等时”格架约束地震预测方法在塔里木盆地富满油田某区块取得明显应用效果, 支持钻井成功率在95%以上, 高效井比例达到75%。该方法在相似地质条件区块可有效推广。

Facing the heterogeneous fault control reservoir of an ultra-deep (8000~9500m) fault fracture zone, it is of great significance for oil and gas exploration and high-efficiency production to effectively reveal the heterogeneous characteristics in the structure of fault fracture zones.Currently, the commonly used reservoir inversion technical scheme adopts an isochronous sedimentary framework to perform constrained inversion, which does not reflect the characteristics of the fault system that controls reservoir development.The implementation of reservoir spatial distribution characteristics is limited and efficient development faces significant challenges.Therefore, a new targeted seismic identification technology for heterogeneous reservoirs in fault fracture zones was developed.First, dip angle scanning of seismic data was carried out to extract the heterogeneous information of the fault fracture, and then the "Dual-isochronous" framework of isochronous deposition and isochronous fracture of fault activity was constructed.The framework was constrained in the inversion process, and multiple iterations were completed to realize the organic integration of geological research results and iterative calculation of seismic inversion.Finally, the reservoir prediction results were obtained.The comprehensive effect of an underground heterogeneous reservoir was restored to the greatest extent possible, and a quantitative prediction of an ultra-deep complex carbonate fault-controlled reservoir was realized.The forward modeling results showed that the recognition rate of reservoirs in the fracture zone was 98.1%, which was 87.05% higher than that of the conventional sparse pulse inversion results.The application shows that this method has achieved clear results in the FuMan oilfield in the Tarim Basin, with the success rate of supporting drilling reaching more than 95% and the proportion of efficient wells reaching 75%.This method is effectively popularized in blocks with similar geological conditions and has a certain reference value for identifying abnormal geological bodies in gravity, electric, and magnetic exploration.