一种波阻抗去压实校正反演方法在储层预测中的应用  

Application of wave impedance inversion with decompaction correction on reservoir prediction

作　　者：陈永芮[1,2] 张曼丽 李振春 张立昌[2] CHEN Yong-rui;ZHANG Man-li;LI Zhen-chun;ZHANG Li-chang(China University of Petroleum,Shandong Qingdao 266580,China;Dongying Star Petroleum Technology,Shandong Dongying 257000,China;China United Academy of Petroleum Sciences,Shandong Dongying 257000,China)

机构地区：[1]中国石油大学(华东),山东青岛266580 [2]东营石大潜力,山东东营257000 [3]北京中科联华石油科学研究院,山东东营257000

出　　处：《地球物理学进展》2018年第4期1469-1474,共6页Progress in Geophysics

摘　　要：研究区目的层埋深差异大,受差异压实影响,同一时期沉积的地层,深层砂岩波阻抗大于浅层波阻抗,导致反演结果难以识别砂泥岩,储层预测结果不可靠.针对这一问题,统计分析原始测井波阻抗数据,对波阻抗进行去压实校正,去除数据中代表地层压实趋势的低频能量,然后将去压实校正后的波阻抗数据应用于稀疏脉冲约束反演.通过处理前后波阻抗数据对比分析,去压实校正方法不仅去除了地层压实趋势,而且保留了波阻抗数据相对变化幅度的真实性.处理后波阻抗数据得到的反演结果更易于区分砂泥岩,与实钻井结果吻合度高,预测储层展布特征与研究区地质沉积认识相一致.实际数据处理结果表明:这种去压实校正方法简捷有效,提高了反演预测储层的精度,在埋深差异大地区具有很好的实用价值.The buried depth of strata is greatly different in this study area. Under the influence of differential compaction,deep sandstone has bigger wave impedance than shallow sandstone deposited at same period. If the impedance data are used for sparse spike inversion,the inversion result is unreliable. It is difficult to distinguish sandstone from mudstone by the inversion result. To solve this problem,this paper presents the method of decompaction correction by analyzing the impedance data. The low frequency of original impedance mainly represents the formation compactiontrend,so we use the designed filtering to suppress the low frequency in 3 Hz and apply the processed data to the sparse spike inversion. Through comparing the impedance data of before and after decompaction correction,it is proved that this method can effectively remove formation compaction trend. This method can reserve the high frequency of original impedance data and protect the relative variation of wave impedance from damage. The inversion result with processed data is easier to divide sandstone from mudstone in target zone and highly coincides with the actual drilling data. The reservoir spatial distribution predicted by the processed inversion is consistent with the geological understanding as well. The result of practical application indicates that the method can be implemented quickly and effectively and significantly improve the inversion accuracy in the area with different buried depth.

关 键 词：波阻抗 去压实校正 稀疏脉冲反演 储层预测 

分 类 号：P631[天文地球—地质矿产勘探]