基于小波边缘分析与井—震联合建模的波阻抗反演技术在陆梁隆起带储层预测中的应用  

Application of wave impedance inversion technology based on wavelet edge analysis and combined well-seismic modeling in reservoir prediction of Luliang uplift zone

作　　者：史全党[1] 孔令业 吴超[1] 丁艳雪 刘泽民[1] 于雪[1] 王江[2] SHI Quan-Dang;KONG Ling-Ye;WU Chao;DING Yan-Xue;LIU Ze-Min;YU Xue;WANG Jiang(PetroChina Xinjiang Oilfield Company Gas Production Plant No.1,Karamay834000,China;Exploration and Development Research Institute of Daqing Oilfield Co.,Ltd.,Daqing163712,China)

机构地区：[1]中国石油新疆油田公司采气一厂,新疆克拉玛依834000 [2]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《物探与化探》2023年第6期1425-1432,共8页Geophysical and Geochemical Exploration

基　　金：国家重大科技专项“大型油气田及煤层气开发”(2011ZX05001-001-004)。

摘　　要：针对准噶尔盆地陆梁隆起断裂构造复杂、储层横向非均质性强、含气砂体小而薄预测难的问题,应用小波边缘分析与井—震联合建模的波阻抗反演技术,从地震记录中直接提取反映构造和岩性变化的地震属性特征参数,与测井声波阻抗数据一起建立初始模型并参与波阻抗模型的扰动修改。此反演技术弥补了井间插值建模过程中井间高频成分的缺失和井间岩性的局部变化细节,避免了常规波阻抗反演过程中由于初始模型不准确而产生的错误信息,提高了地震资料识别“小而薄”砂体的分辨能力。结果表明:受东部克拉美丽山物源控制,在陆梁隆起带DX14井区梧桐沟组形成扇三角洲—半深湖(深湖)沉积体系;发育一系列扇三角洲前缘砂体。实际钻井结果与钻前预测对比表明,井点处预测砂岩厚度的绝对误差小于0.60 m,相对均方误差小于2.84%,预测精度满足精细储层预测要求。研究成果可为精细油藏描述和井位部署提供依据。The Luliang uplift zone in the Junggar Basin exhibits intricate fault structures,laterally heterogeneous reservoirs,and small-scale and thin gas-bearing sand bodies,presenting challenges in reservoir prediction.Hence,this study applied the wave impedance in-version technology based on wavelet edge analysis and well-seismic joint modeling to directly extract seismic attributes'characteristic parameters that reflect structural and lithological changes from seismic records.These seismic attribute characteristic parameters were used to build the initial model together with acoustic impedance logs and participated in disturbance modification of the wave impedance model.This inversion technology counteracted the lack of inter-well high-frequency components and the inter-well local lithologic chan-ges during the inter-well interpolation modeling and avoided error information caused by the inaccurate initial model in the conventional wave impedance inversion,thus improving the resolution of seismic data in identifying small-scale and thin sand bodies.The results show that under the control of the provenance of the Kelameili Mountain in the east,a fan delta-semideep(deep)lacustrine sedimentary sys-tem formed in the Wutonggou Formation in the DX14 well area of the Luliang uplift zone,hosting many fan delta-front sand bodies.The comparison between the actual drilling results and the pre-drilling prediction results indicates that the absolute error and relative mean error of sandstone thickness prediction at the well site were less than 0.60 m and less than 2.84%,respectively,suggesting that the pre-diction accuracy meets the requirements of fine-scale reservoir prediction.The research results provide a guide for fine-scale reservoir description and well deployment.

关 键 词：小波边缘分析 井—震联合建模 波阻抗反演 储层预测 地震属性特征参数 DX14井区 陆梁隆起带 

分 类 号：P631.4[天文地球—地质矿产勘探]