频谱恢复和波形反演在大宁—吉县区块薄储层预测中的应用  

Application of Spectral Recovery and Waveform Inversion in ThinReservoir Prediction in Daning Jixian Block

作　　者：张科 窦松江[1] 高欢欢 石石 李涛[1] 汤戈[1] 杨冰[1] Zhang Ke;Dou Songjiang;Gao Huanhuan;Shi Shi;Li Tao;Tang Ge;Yang Bing(Exploration and Development Research Institute of Dagang Oilfield,Tianjin 300450,China;National Engineering Research of Coalbed Methane Development&Utilization,Beijing 100020,China)

机构地区：[1]大港油田勘探开发研究院,天津300450 [2]中联煤层气国家工程研究中心有限责任公司,北京100020

出　　处：《吉林大学学报（地球科学版）》2024年第6期2142-2153,共12页Journal of Jilin University：Earth Science Edition

基　　金：中国石油集团“十四五”重大专项(2021DJ2002(JT))。

摘　　要：鄂尔多斯盆地东部大宁—吉县B区块山西组二段三亚段(山23)的薄储层常与太原组顶部的碳酸盐岩伴生,储层致密,岩性复杂,砂、泥岩阻抗差异小,非均质性强,储层预测难度大。为有效提高地震资料定量解释的精度,落实B区块薄储层的分布特征,笔者提出了一种地震相拓频反演相结合的薄致密砂岩储层预测方法。该方法首先根据地质、测录井等资料建立储层岩心相、测井相、地震相特征,然后利用频谱恢复拓频技术提高地震资料的分辨率,最后重构岩性特征曲线,利用拓频后的高分辨率地震资料进行波形指示反演,雕刻薄储层平面分布,实现研究区山23致密薄储层定量预测。结果表明:目的层有4种地震响应特征,分别为①水下分流河道相,表现为强—中弱强振幅组合,②水下分流河道相侧翼区,表现为强—弱—强振幅组合,③席状砂、远砂坝相,表现为中弱—中强—强振幅组合,④分流间湾相,表现为弱—强振幅组合;地震资料的主频由30 Hz提升至40 Hz,频宽由10~60 Hz拓宽至8~80 Hz,使得薄储集层在提高频率后的资料中表现得更清晰;重构特征曲线,利用拓频后的地震数据反演的砂岩厚度与井点厚度具有很好的线性关系,判定系数达到0.911,吻合度为84%,依据反演成果指导水平井钻进,储层钻遇率达95%。In the eastern Ordos basin,thin reservoirs in the Third Submember of the Second Member of Shanxi Formation(Shan 23 Submember)of Daning Jixian Block B are frequently closely associated with carbonate rocks atop Taiyuan Formation.These reservoirs are tight,with complex lithology,small impedance difference between sandstone and mudstones strong heterogeneity,and great difficulty in reservoir prediction.In order to effectively improve the accuracy of quantitative interpretation of seismic data and implement the distribution characteristics of thin reservoirs in Block B,a novel prediction method for thin tight sandstone reservoirs amalgamating seismic phase,frequency extension and inversion phase has been proposed.This method firstly makes clear the characteristics of core facies,electrical logging facies and seismic facies of the reservoir based on geological and logging data.Subsequently,spectral recovery and frequency extension technologies are used to improve the resolution of seismic data.Lastly,the lithology curves are regenerated,and waveform indicative inversion is performed using the high-resolution seismic data after frequency extension and the planar distribution of thin reservoirs is depicted to realize the quantitative prediction of tight and thin reservoirs in the Shan 23 Submember of the study area.The results show that there are four types of seismic response characteristics for the target layer:①Subaqueous distributary channel facies,characterized by a combination of strong,medium-weak and strong amplitude;②Lateral area of subaqueous distributary channel facies,characterized by a combination of strong,weak and strong amplitude;③Sheet sand and distal sand bar facies,characterized by a combination of medium-weak,medium-strong and strong amplitude;④Distributary bay facies,characterized by a combination of weak and strong amplitude.The dominant frequency of the seismic data is increased from 30 Hz to 40 Hz,and the frequency bandwidth is expanded from 1060 Hz to 880 Hz,making more clear images for

关 键 词：储层预测 复杂岩性 薄储层 曲线重构 波形指示反演 

分 类 号：TE132[石油与天然气工程—油气勘探]