摘要
高角度裂缝是影响致密油气藏中开发井产能和开发效果的关键因素,基于地震射线原理,结合常规野外地面采集观测系统特征及其有限长度,对不同埋藏深度、不同倾角裂缝推导出其地震反射信号的地面分布偏离大小,并指出受地震采集0~6s有效记录窗口、常规地震处理时低地层倾角偏移归位技术的共同制约,无法获得高角度裂缝的地震反射有效信号,进而难以利用射线原理对其进行有效检测。结合现有裂缝检测技术,指出基于地震波动理论的断点绕射归位处理下的相干体和蚂蚁体进行高角度裂缝检测,远近偏和方位差属性下的地层各向异性实现低角度裂缝检测,利用多属性融合来综合检测高角度裂缝。
High Angle fractures are the key factors affecting the productivity and development effect of development wells in tight oil and gas reservoirs.Based on the principle of seismic ray,combined with the characteristics of conventional field ground acquisition and observation system and its limited length,the deviation size of ground distribution of seismic reflection signal is deduced for different buried depths and different dip angles of cracks.It is pointed out that due to the constraints of 0-6 s effective recording window of seismic acquisition and low dip angle migration homing technology in conventional seismic processing,effective seismic reflection signals of high-angle fractures cannot be obtained,and thus it is difficult to effectively detect them by ray principle.Combined with the existing crack detection techniques,it is pointed out that the coherent body and ant body under the breakpoint diffraction homing processing based on seismic wave theory can detect high-angle cracks,the formation anisotropy under the far-near deviation and azimuth difference attributes can realize low angle fracture detection,and the multi-attribute fusion can detect high-angle cracks comprehensively.
作者
许胜利
张雨
孙玉红
许靖康
滑彩虹
李灿灿
XU Shengli;ZHANG Yu;SUN Yuhong;XU Jingkang;HUA Caihong;LI Cancan(Engineering Technology Branch,CNOOC Energy Development Co.,Ltd.,Tianjin 300459,China;Oilfield Chemical Division,China Oilfield Services Co.,Ltd.,Tianjin 300459,China)
出处
《石油工业技术监督》
2024年第11期1-5,共5页
Technology Supervision in Petroleum Industry
基金
中海石油(中国)有限公司“七年行动计划”重大科技专项(编号:CNOOC-KJ135ZDXM36TJ08TJ)。
