辽河油田Walkaway VSP资料采集及效果分析  

Data Acquisition and Effect Analysis with Walkaway VSP in Liaohe Oilfield

作　　者：董文波[1] 

机构地区：[1]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124010

出　　处：《非常规油气》2016年第6期36-40,共5页Unconventional Oil & Gas

摘　　要：为解决地面三维地震资料分辨率低、常规VSP资料成像品质差且存在盲区,难以识别小断层、微幅构造及薄储层预测的问题,开展了Walkaway VSP技术攻关,对该技术选井原则、观测参数设计、观测系统优化等进行了分析,并对采集资料进行了对比。结果表明,观测井要控制全区,需要满足＂直井、大井深、井况好、地表好＂4个原则。接收井段为320~1900m时既可避免第四系吸收衰减,且资料成像范围最大。井源距为2500m、炮点距为25m时,覆盖次数最高且分布均匀,对多次波的压制效果较好。在此关键参数优化基础上设计了Walkaway VSP观测系统。资料对比显示,Walkaway VSP资料视分辨率明显提高、整体资料品质改善较大,且主频和带宽均有较大幅度拓宽。采用可控震源激发,大阵列检波器接收,有助于降低施工成本,缩短生产周期。In order to solve those problems that existed in 3D seismic as low resolution,poor image quality and the blind areas in conventional VSP data,difficult to identify small faults,micro structures and thin reservoir,etc,the research on Walkaway VSP has been conducted,and analyzed the principle of well selection,the design of observation parameter,optimization of observation system,etc.,finally all the data were compared. Results showed that the observation well should be used to control the whole region,and it should meet the need of such conditions as straight,deep well,with good downhole and surface conditions. When the receiving section is between 320 m and 1900 m,it can avoid the adsorption attenuation in Quaternary,and obtain the maximum range of data imaging. When seismic source distance and shot point distance are2500 m and 25 m respectively,it has the highest frequency of coverage,with the even distribution,which has good effect to suppress the multiple waves. The Walkaway VSP observation system was designed on the basis of key parameters optimization. Comparison of data showed that the apparent resolution and overall data quality of Walkaway VSP were improved obviously,with the main frequency and bandwidth widened greatly. By using the vibrator excitation and large-array detector receiving signal,the operation cost can be lowered and production cycle shortened respectively.

关 键 词：辽河油田 Walkaway VSP 高分辨率勘探 可控震源 观测系统 

分 类 号：P631.4[天文地球—地质矿产勘探]