基于主控因素的潜山裂缝储层多尺度地震预测

Seismic multi⁃scale fracture prediction for buried⁃hill reservoirs based on main controlling factors

现有潜山裂缝性储层预测方法多用于描述单一尺度的裂缝带发育特征。为综合反映渤海湾盆地M气田太古界潜山裂缝储层多尺度特征,提出基于主控因素的潜山裂缝储层多尺度预测技术:(1)针对沟—脊微地貌控风化有利区,利用曲率属性刻画潜山顶面沟—脊形态,预测宏观尺度风化成因裂缝富集条带;(2)针对燕山—喜山期发育的近东西向高陡断缝体控潜山构造缝,基于Radon变换技术预测大尺度高陡断缝体的分布;(3)以区域断裂发育方向和倾角为约束,利用蚂蚁体属性预测中、小尺度微断裂带;(4)基于Contourlet变换依次分解得到曲率属性、Radon变换属性、蚂蚁体属性的低频端和高频端信息,分别设计低频端、高频端融合规则,实现三种尺度裂缝带预测结果的有效融合。融合属性预测结果与FMI成像测井裂缝密度以及生产测试认识吻合,综合反映了潜山多尺度裂缝带发育特征,指导了M气田开发井设计与优化,同时证明所提方法具有实用性。

The existing fracture prediction methods for buried-hill reservoirs mostly describe the development char-acteristics of single-scale fracture zones.In order to comprehensively reflect the multi-scale fracture characteristics of Archaeozoic buried-hill reservoirs in M gas field of the Bohai Basin,a multi-scale fracture prediction technique for buried-hill reservoirs based on main controlling factors is proposed.①In view of the favorable area of micro-geomor-phology and weathering control of grooves and ridges,the curvature attribute is used to characterize the groove and ridge morphology on the top surface of the buried hill and predict the macro-scale fracture accumulation bands caused by weathering.②In view of the structural fractures of buried-hill controlled by high and steep faults along the near east–west direction in Yanshanian—Himalayan stages,the distribution of large-scale steep faults is predicted based on Radon transform technique.③Constrained by the direction and angle of regional fault development,the me-dium and small scale micro-fault zones are predicted by using ant tracking attributes.④The low-frequency and high-frequency information of curvature attribute,Radon transform attribute,and ant tracking attribute are obtained based on the Contourlet transform.The fusion rules of low-frequency and high-frequency information are designed respectively,and the prediction results of fracture zones with three different scales are effectively fused based on the Contourlet transform.The fusion attribute is well matched with FMI imaging logging fracture density and pro-duction test knowledge,which comprehensively reflects the development characteristics of multi-scale fracture zones in the buried hill and guides the design and optimization of development wells in M gas field.It is proved that the seismic multi-scale fracture reservoir prediction technique has practicality.