浅层气对下伏地层深度预测影响定量研究及在渤海B油田中的应用  

Quantitative research and application of influence of shallow gas on depth prediction for underlying strata in B oilfield in Bohai

作　　者：刘建辉 夏同星 郭军 周学锋 

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452

出　　处：《物探与化探》2016年第4期763-770,共8页Geophysical and Geochemical Exploration

基　　金：中国海洋石油总公司"十二五"重大攻关项目课题"海上开发地震技术集成与应用研究"(CNOOC-KJ125ZDXM06LTD-10-KFSC-1)

摘　　要：浅层气的存在造成下伏地层地震反射出现假象,使得深度预测不准确,增大了油田开发钻井风险。为提高浅层气下伏地层深度预测精度,利用理论模型分析量化描述浅层气对下伏地层的影响范围和影响程度,同时通过正演模拟手段构建时差定量校正量版,指导储层高精度深度预测。根据研究成果和认识,成功解释了渤海B油田两口已钻井深度误差出现的原因,并进一步利用时差校正量版提高了该油田区目标储层深度预测的精度,成功指导了后续多口开发井的准确钻探。The quality of seismic image of underlying strata is negatively affected by shallow gas. Therefore,it is difficult to predict the depth of target zone accurately. Thus the drilling risk of horizontal wells is greatly raised as well. In order to improve the accuracy of depth prediction,we use theoretical model analysis to quantize the gas influence including the range and extent. Furthermore,we build many models to achieve pre-stack forward modeling and acquire a series of correlation templates which can be applied to quantitatively depth correlation. According to our research,we successfully explain why there exits so large depth difference between two drilled wells in B oilfield. Furthermore,we compute correlation templates to achieve a high-precision depth prediction for underlying reservoir of shallow gas. Therefore we efficiently guide the drilling of follow-up development wells. We believe our research production will be well used in other offshore oilfields containing shallow gas as well,especially under the condition of sparse well patterns offshore.

关 键 词：浅层气 理论模型分析 正演模拟 深度预测 定量研究 

分 类 号：P631.4[天文地球—地质矿产勘探]