浅层河道砂精细描述技术在埕岛地区中的应用
Application of Fine Description Technology for Shallow Channel Sand in Chengdao Area

由于河道迁移频繁，河道砂具有厚度薄、横向变化快、多期河道叠置等特点，单砂体识别困难，常规方法难以满足勘探程度较高的油田进一步精细挖潜的需求。针对埕岛油田馆上段河道砂储层的特点，本文提出基于多方法融合的薄储层精细描述技术：应用时频分析方法对地震数据进行高分辨处理，提取多种地震属性拟合分析河道整体分布走向及规模，并采用曲线校正及地质统计学进行井震联合反演，以提高薄储层预测精度。研究结果表明：① 地震多属性融合分析可有效刻画河道平面展布，明确河道发育演变历程，半定量计算河道砂体厚度；② 对测井资料进行高质量预处理后采用地质统计学反演可提高储层横纵向识别精度，纵向上可有效识别厚度大于5米薄储层，横向上砂体连断叠置关系识别准确度提高；③ 由此形成一套浅层河道砂储层精细描述技术体系，已应用于埕岛油田西北部A208块馆上段的新区产能建设，并取得显著成效，可为类似区块的勘探开发提供有力技术支撑。
Due to frequent river migration, river sand has the characteristics of thin thickness, rapid lateral changes, and multiple overlapping river channels. It is difficult to identify single sand bodies, and conventional methods are unable to meet the needs of further refined exploration of oil fields with high exploration levels. This paper proposes a fine description technique for thin reservoirs based on multi method fusion, targeting the characteristics of sand reservoirs in the Guanshang section of Chengdao Oilfield. The technique involves high-resolution processing of seismic data using time-frequency analysis methods, extracting multiple seismic attributes to fit and analyze the overall distribution direction and scale of the river channel. Curve correction and geostatistics are used for well seismic joint inversion to improve the accuracy of thin reservoir prediction. The research results indicate that: (1) seismic multi-attribute fusion analysis can effectively characterize the planar distribution of river channels, clarify the development and evolution process of river channels, and semi quantitatively calculate the thickness of river sand bodies; (2) After high-quality preprocessing of logging data, the use of geostatistical inversion can improve the accuracy of reservoir identification in both horizontal and vertical directions. Thin reservoirs with a thickness greater than 5 meters can be effectively identified in the vertical direction, and the accuracy of identifying the stacking relationship of sand bodies in the horizontal direction can be improved; (3) This has formed a fine description technology system for shallow channel sand reservoirs, which has been applied to the production capacity construction of the Guanshang section of A208 block in the northwest of Chengdao Oilfield, and has achieved significant results, providing strong technical support for the exploration and development of similar blocks.