纯纵波提取技术在大民屯凹陷砂砾岩体储层预测中的应用

Application of Pure Compression Wave Extraction Technology in Reservoir Prediction of Sandy Conglomerate Body in Damingtun Sag

大民屯凹陷古近系沙河街组四段为扇三角洲沉积,具有近源混杂堆积,纵向厚度大,相带及岩性变化快,含油气井段长、差异大等特点;且研究区地震资料分辨率低,声波测井曲线不能直接反映储层特征,难以识别砂砾岩体的有利储层。纯纵波提取技术能够克服水平叠加的缺点,有效去除AVO(振幅随偏移距的变化)效应,获取高分辨率的地震资料。为此,应用纯纵波提取技术对原始地震资料进行处理,提高地震资料的分辨率,满足后续地震反演的需求;再利用拟声波重构技术进行地震反演,准确刻画出砂砾岩体的有利储层相带,可以有效指导勘探开发。

Es4 in Damintun Sag is a fan delta deposit with characteristics of near-source mixed sedimentary,large vertical thickness,rapid variation of facies,belt and lithology,long oil-bearing section and large difference.The resolution of seismic data is very low,and the well logging curves can not directly reflect the reservoir characteristics in the study area.With the conventional pure-wave seismic data,seismic inversion is very difficult to identify the favorable reservoir of sandy conglomerate body in this area.The method of pure compression wave extraction is applied to solve the above-mentioned problems,effectively remove the effect of AVO for obtaining the seismic data with high resolution.In quasi-acoustic wave reconstruction technology,the low frequency information of formation background velocity is considered,by which the formation information can be more truly reflected.Therefore by using the pure compression wave extraction technology for processing the original seismic data,the resolution of seismic data is improved,it can satisfy the needs of subsequent seismic inversion,the quasi-acoustic wave reconstruction technology is used again for seismic inversion for accurately depicting the favorable reservoir belts for effectively guiding exploration and production in oilfields.