低幅度薄储层区块的目标处理及应用效果

Study and application of target-oriented processing techniques for low relief area with thin reservoir in P Block

P区块位于哈萨克斯坦的南图尔盖盆地,有利勘探目标侏罗纪地层属于陆相碎屑沉积。由于湖水进退频繁,造成砂体储层薄、横向变化快,且该区的构造圈闭幅度较小。针对该地区的地质和地球物理资料特点,通过开展目标处理技术的研究和应用以提高地震资料的品质。利用微测井约束的层析静校正提高低幅度构造的成像精度;通过井控子波处理提高地震数据的纵向分辨率,利用OVT域规则化改善观测系统的空间采样属性,提高资料的信噪比和横向分辨率;应用VSP速度、声波测井速度约束地震速度以改进地震速度分析的可靠性,满足低幅度薄储层成像对速度精度的要求。结果表明,目标处理技术的应用提高了研究区地震资料的成像精度和纵横向分辨率,满足低幅度薄储层的勘探要求,为落实该区块低幅度构造高产油藏提供了可靠的基础。

P Block is located in the South Turgay Basin of Kazakhstan in which the favorable target Jurassic strata geologically belong to continental clastic sedimentation.Due to the frequent lake water intrusion and retreat,the reservoirs in this area are normally thin,with rapid lateral changes,and the structural trap is relatively small.Based on the geology and data characteristics of this area,the study and application of target-oriented processing techniques are carried out to improve the quality of seismic data processing.Tomographic static correction constrained by LVL information is executed to improve the imaging accuracy of relief structure;well-constrained wavelet processing is used to improve the vertical resolution of seismic data,and the OVT domain regularization is utilized to improve the spatial sampling attribute of the observation system,the S/N ratio,and the lateral resolution;seismic velocity analysis constrained by the VSP and acoustic velocity is implemented to improve the velocity reliability to meet the requirement of the relief structure imaging.After the application of such target-oriented processing techniques,the imaging accuracy and both the vertical and horizontal resolution achieve improvements,which can meet the requirement of exploration in this area and provide a reliable foundation for the fulfillment of increasing production in the P block.