空间域CMP参考基准面实现方法及其效果  

Realization Method and Effect of the Spatial Domain CMP Reference Datum

作　　者：郑鸿明[1] 康月萍[1] 姜元刚[1] 谭磊[2,3] 秦瑞[2,3] 郑超[2,3] 

机构地区：[1]中国石油新疆油田分公司勘探开发研究院地球物理研究所,乌鲁木齐830013 [2]长江大学油气资源与勘探技术教育部重点实验室,武汉430100 [3]长江大学地球物理与石油资源学院,武汉430100

出　　处：《新疆石油地质》2015年第2期214-217,共4页Xinjiang Petroleum Geology

摘　　要：地震资料处理和解释均会涉及到基准面问题,而且不同的基准面对处理结果的影响程度也不同。常规静校正方法定义的基准面可以满足地震资料处理的要求,但也存在一些不足,如基准面的时深转换问题、地表平滑面与CMP参考面的误差问题等。通过已知表层结构参数反算基准面的方法,实现了既能使静校正量符合最小原则,又能使每个CMP道集拥有各自的水平基准面,并赋予其精确的海拔含义,在满足地震资料处理要求的同时,也能够为综合研究提供一个剖面解释和构造转深的海拔基准面,从而避免了时间域CMP参考面的换算误差。理论模型试验证明,该方法比常规基准面方法得到深度域剖面的构造精度明显提高,为低幅度构造勘探提供了有力的技术手段。Seismic data processing and interpretation will involve the datum level problem, and the influence of different datum levels on the results is different. The datum defined by conventional static correction method can meet the requirements of seismic data processing, but there are some deficiencies, such as time-depth conversion of the datum, error between smooth surface and CMP datum, etc. In this pa- per, back-calculation of the datum is based on the known surface structure parameter, by which not only make the static correction in line with the principle of minimum, but also allow each CMP gather to have individual horizontal datum, give the datum more accurate above-sea -level meaning, and be able to get a elevation datum from profile interpretation and structure-depth conversion for comprehensive research, while having satisfied the requirements of seismic data processing, thus avoiding the errors of CMP datum conversion in time domain. The theoretical model tests show that the structure accuracy of the depth-domain profile in this approach is obviously improved compared to the conventional datum method. It provides a powerful means for petroleum exploration in low-amplitude structures.

关 键 词：最小静校正量 空间域 时深转换 基准面误差 

分 类 号：P631.443.91[天文地球—地质矿产勘探]