双井Walkaway VSP技术在辽河坳陷曙光高陡构造地区的应用研究  

Application research of dual-well Walkaway VSP technology in Shuguang high-steep structure of Liaohe depression

作　　者：赵超峰 田建涛 张伟 邵敏 高雁 冯博 朱红 李金伟 ZHAO Chao-feng;TIAN Jian-tao;ZHANG Wei;SHAO Min;GAO Yan;FENG Bo;ZHU Hong;LI Jin-wei(Liaohe Geophysical Exploration Company Branch of BGP CNPC,Panjin 124010,China)

机构地区：[1]中国石油集团东方地球物理勘探有限责任公司辽河物探分公司,盘锦124010

出　　处：《地球物理学进展》2020年第1期265-271,共7页Progress in Geophysics

基　　金：中国石油天然气股份有限公司重大科技专项“辽河油田千万吨稳产关键技术研究与应用”(2017E-1602)资助.

摘　　要：针对辽河坳陷西部凹陷曙光潜山高陡构造带顶界面断裂成像精度差、内幕地层识别难的问题,开展双井Walkaway VSP应用研究.利用大阵列检波器接收、炸药与震源联合采集方法,获得了高品质采集数据,是高陡构造成像的基础;子波一致性校正、基于射线追踪的矢量波场分离、VSP数据与地面地震数据联合各向异性速度建模、双井Walkaway VSP成像方法对比等针对性处理技术和波阻抗反演、地震属性提取等综合研究方法的应用,精细刻画了潜山顶界面,新识别出井旁小断层,落实了大倾角潜山构造形态,分析了内幕地层的接触关系,对板岩隔夹层及储层分布有进一步认识,展现了Walkaway VSP技术在高陡构造地区的应用前景.研究得到以下认识:(1)逆时偏移成像方法对高陡潜山成像更具适用性;(2)增加检波器进入潜山内幕的深度,避开潜山高速顶界面的能量屏蔽及滑行波、转换波等干扰,对潜山勘探具有重要意义;(3)双井Walkaway VSP联采时,两井距离要控制在一定范围内,防止两井间距离过大对深层偏移成像造成影响.The application research of dual-well Walkaway VSP technology is carried out for increasing the poor imaging accuracy at the top interface of the buried hill and identifying the inner buried hill in Shuguang high-steep structure of West Sag of Liaohe Depression.Large array of detectors and joint acquisition of explosives and vibrators have received high quality acquisition data.By applying wavelet consistency correction,vector wave field separation based on ray tracing,VSP and seismic data joint anisotropic velocity modeling,dual well Walkaway VSP imaging and other targeted processing techniques and comprehensive research methods of wave impedance inversion and seismic attribute extraction,the top interface of buried hill is delicately depicted,minor faults near wellbore are identified,structural morphology of large dip buried hill is implemented,contact relationship of inner strata is analyzed,understanding of slate interbedding and reservoir distribution is enhanced.Walkaway VSP technology has better application prospects in high-steep structural areas.We obtain the following understandings:(1)Reverse time migration imaging method is more suitable for imaging of high-steep buried hill;(2)Increasing the depth of the detector into the inner buried hill and avoiding the energy shielding of the buried hill high-speed top interface and the interference of the sliding waves and the converted waves are of great significance for the exploration of the buried hill;(3)When the dual-well walkaway VSP is acquired,the distance between wells should be controlled within a certain range,and the excessive distance between the wells is prevented from affecting the deep migration imaging.

关 键 词：Walkaway VSP 高陡构造 潜山内幕 逆时偏移成像 构造解释 反演 地震属性提取 

分 类 号：P631[天文地球—地质矿产勘探]