论文详情
针对方位角度域地震资料对砂岩储层地球物理响应存在一定差异这一现象,以鄂尔多斯盆地杭锦旗盒3段为例,依托杭锦旗构造平缓地区宽方位采集与分方位偏移地震资料,优选反射界面相对独立且特征清晰的辫状河道发育区,分别对导眼井和水平井开展六级河道构型单元划分,进而与各方位地震资料反射特征及沿层层序地层切片进行分析对比。在此基础上,结合研究区某水平井实钻心滩岩性物性条件突变的特征,证实了平行河道走向的方位地震资料在辫状河道连续性及心滩长度刻画准确度方面,相比其它方位资料具有明显优势。研究结果对于五维地震技术在储层精细描述领域的应用具有重要意义,为提高以储层识别精度为目的的道集数据扇区划分方案优化提供了依据。
Based on wide-azimuth 3D seismic acquisition and azimuthal migration data from the flat structure of the Hangjinqi area,Ordos Basin,the braided channel of P1x3 that features a relatively independent and clear reflection interface was selected.Six class channel configuration units were used for pilot and horizontal wells.Then,the reflection characteristics of seismic data in all directions and sequence stratigraphic slices along the stratum were analyzed and compared.Combined with the sudden change in the sedimentary microfacies of the channel bar in the horizontal well in the study area,seismic data parallel to the river channel direction can more accurately depict the continuity of the braided channel and the length of the channel bar than other azimuth data.The prediction accuracy of the thin sandstone reservoir was significantly improved using the proposed method.This is of great significance for the application of 5D seismic technology in the field of reservoir description,and provides a strong basis for data gathering and optimization of azimuth sector division for reservoir identification.
中国石化科技部项目“中国石化复杂储层岩石物理应用基础研究”(P20056-1)资助。