陕北富县黄土塬地区二维直测线地震资料处理实例

陕北富县地区以前的地震勘探沿沟布设弯曲测 线,平面展布呈不规则树枝状,难以形成闭合回 路,很难对二维地震资料在平面上进行储层反 演。2001年在陕北富县探区进行野外采集方法和 地震处理技术攻关,通过采用极其灵活的可变线 元观测系统实现直测线过塬,使测线成网连片; 资料处理中采用基于模型反演的折射波静校正、 地表一致性振幅补偿和反褶积、叠前噪音衰减等 技术,为后续的储层预测、低幅度构造解释和综 合地质研究提供了高保真的地震资料;由于测线 的连片成网,通过伪测井的方法对无井测线进行 控制,最终实现储层反演的连片解释。

2D seismic data processing for straight lines in the loess plateaus in Fuxian of Shanbei

The crooked seismic lines along valleys were irregular previously in Fuxian of Shanbei, showing an irregular branch in plane, and hard to complete close grids. Therefore, it's difficult to conduct reservoir inversion of 2D seismic data. In 2001, Zhongyuan Oilfield Company carried out the study on field acquisition methods and seismic processing technology in Fuxian. Straight lines were passing through plateaus and formed seismic grids by using flexible geometry with variable linear bins. Data processing involved model-inversion based refraction static correction, surface consistent amplitude compensation, deconvolution, and pre-stack noise attenuation. As the result, seismic data with a high fidelity was provided for the subsequent reservoir predictions, small-amplitude structure interpretation and integrative geologic study. Because all lines were jointed to form grids, comprehensive interpretation of reservoir inversion could be finally implemented by using the pseudo logging method to control lines without wells.