倾斜界面叠前深度偏移深度空校方法  

SPATIAL CORRECTING METHOD OF THE PRESTACK DEPTH MIGRATION FOR THE INCLINED INTERFACE

作　　者：王江[1] 陈鸿平[1] 党萱 王重阳 李海洋[3] 王杰[1] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]Dalhousie University,Halifax B3JDBS,Canada [3]大庆油田有限责任公司井下作业分公司,黑龙江大庆163458

出　　处：《大庆石油地质与开发》2017年第6期121-126,共6页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金重点项目“四川盆地构造动力学、盆地叠合特征及油气富集规律研究”(41030426)

摘　　要：为了精确刻画地下构造形态,克服由于地震偏移速度与地层实际速度差异造成的叠前深度偏移深度与钻井深度误差,基于几何地震学理论,考虑成像速度和地层速度差异引起的深度误差和位置方向变化,推导出一种实现叠前深度偏移资料深度域空校方法。应用不定度的主方向确定每个面元的移动方向,使处理剖面各地震反射层面与所有钻井深度相符合,有效地提高了叠前深度偏移资料的成像精度。通过23口井构造不定度方法校正证实,该方法所成构造图精度较高,相对误差均小于2.3‰。In order to accurately characterize the underground structural configuration and avoid the depth errors between the depth migration and drilling resulted from the seismic migration and actual formation velocities,based on the geometry seismology,considering the depth errors and the changes of the position and direction caused by the imaging and formation velocities＇ difference,a method was derived to realize the spatial correction of the prestack depth migration data in the depth domain. The main direction of the uncertainty was applied to determine the movement direction of each bin and make each processed seismic reflection plane consistent with all the drilling depth,thus the imaging precision of the prestack depth migration data can be effectively enhanced. Verified by the structural uncertainty method of 23 wells,the developed method is characterized by much higher precision of the structural mapping and furthermore the relative error is less than 2. 3‰.

关 键 词：叠前深度偏移 构造不定度 钻井数据闭合 速度误差 深度误差 

分 类 号：P631[天文地球—地质矿产勘探]