应力场模拟约束下的碳酸盐岩裂缝综合预测——以塔中地区ZG8井区为例

针对叠前各向异性裂缝检测方法对单组裂缝预测有效、对多组裂缝发育区表现为弱各向异性的特点,提出应力场模拟约束下的裂缝综合预测思路。首先通过有限元分析模拟的构造应力场识别出单组及多组裂缝发育区,将其作为地震预测手段的宏观约束,然后在单组裂缝发育区域优选叠前各向异性裂缝检测结果,在多组裂缝发育区域优选曲率等叠后地震属性预测结果。将该方法应用于塔中地区ZG8井区鹰山组碳酸盐岩裂缝型储层综合预测，结果与该区测井解释结果以及构造环境具有很好的一致性,说明应力场模拟约束下的裂缝综合预测思路可行,为复杂碳酸盐岩裂缝预测提供了一条新的途径。

Accurate fracture prediction plays a significant role in the exploration of carbonate reservoirs.However,it is difficult to identify fractures due to extremely complex anisotropic characteristics in fractured carbonate reservoirs.The paper integrates seismic technique with geology means to comprehensively quantitatively predict fracture.On the one hand,pre-stack P-wave anisotropic inversion is adopted to obtain fracture density and orientation.On the other hand,3D post-stack seismic attributes analysis is employed to detect relatively large-scale fracture.In addition,stress field simulation based on finite element analysis is used to discriminate single and multiple sets of fractures.Subsequently,the stress simulation result is used to constrain the results from seismic prediction to optimally characterize fractures.Finally,the method of combining the results from pre-stack and post-stack results with outcomes from stress analysis is applied for fracture prediction in ZG8 area of Tarim Basin,where fractures are comprehensively developed.The results are in good agreement with FMI information and geologic settings,which suggests that the combination of seismic detection method and stress field prediction is a feasible way to delineate fracture property in complex carbonate reservoirs.

国家科技重大专项(2011ZX05004003)、国家重点基础研究发展计划(973计划)(2011CB201103)项目联合资助。