基于构造导向的高清似然属性在白云凹陷深层断裂预测中的应用

Application of high-definition likelihood attributes based on structure orientation in the prediction of deep faults in Baiyun Sag

中海油研究总院有限责任公司,北京100028

CNOOC Research Institute Co.,Ltd.,Beijing 100028,China

白云凹陷深层断裂发育复杂。研究区位于断裂转换带,深层地震资料品质差,常规的相干及其改进技术难以准确刻画研究区内断裂的展布规律,不能有效指导裂缝性储层发育区的预测。针对研究区断裂发育特征,采用增强断裂构造滤波和构造导向滤波降低背景噪声。综合利用似然属性和地震剖面确定背景噪声值,计算最大似然属性,在大断裂或者小、微断裂不同倾角、走向控制下,采用边缘增强迭代技术计算得到适用于主干断裂和微、小断裂预测的两个不同高清似然属性数据,与相干、方差及基于方差的蚂蚁体相比,其背景噪声明显降低,主干断裂分布规律清晰明确,微、小断裂发育区更加聚焦,预测结果与已钻井和地震剖面特征相一致,符合构造转换带、断裂交汇位置为裂缝密集发育区的地质认识,有效指导了研究区断裂精细解释和圈闭落实,指导构造裂缝发育优势区优选及井位优化设计。

The study area is located in the back-to-superimposed fault transition zone of the Baiyun Sag,where the development of deep faults is complex,and the quality of deep seismic data is poor.Conventional coherence and improved techniques cannot accurately describe the distribution of faults in the study area and effectively guide the prediction of fractured reservoirs.Enhanced filtering and structure-oriented filtering were used to reduce background noise according to the development characteristics of faults in the study area.The fault likelihood attribute and seismic profile were combined to determine the background noise value.The tracking data volume was used to automatically analyze the difference in the dip and direction of the main and micro faults,and the clip attribute of the maximum likelihood attribute under the constraints of the background noise threshold was then calculated.Under the control of different inclination angles and strikes of large or micro faults,two different high-definition likelihood attribute data suitable for the prediction of main faults and fractures were obtained through edge enhancement iteration technology.Compared with coherence,variance,and ant tracking data-based variance,the background noise was significantly reduced,the distribution of the main faults was clear,and the fracture development area was more focused.This is consistent with the characteristics of well-drilled and seismic profiles and in line with the geological understanding that the back-superimposed transition zone and intersection of faults are areas with densely developed fractures.The result of this study can be used to effectively guide the fine interpretation of faults and the implementation of traps in the study area.In addition,it can be used to indicate the optimization of a dominant area of structural fracture development and optimal design of well locations.

国家科技重大专项项目(2016ZX05026-007)和中海石油(中国)有限公司综合科研项目(YXKY-ZX012021)共同资助。

10.3969/j.issn.1000-1441.2023.01.014