声波井旁地质体成像技术在复杂断层区的应用

摘要

北部湾盆地乌石凹陷为复杂断块油气藏,油气勘探开发过程中,面临钻井工程风险大、测井取资料作业困难等问题,如何精细描述井旁断层及裂缝等地质体的构造特征显得尤为重要.声波井旁地质体成像技术中偶极横波远探测测井技术,有效地提高了井旁地质体的描述精度.文中对井旁断层的成像特征及偶极横波的方位分辨率进行了正演模拟和分析,利用研究区2口井的声波测井资料验证了声波井旁地质体成像技术能够对井旁发育的小断层进行精确识别和描述.在油气勘探和评价阶段,该技术的应用能够优化钻井方案,避免工程风险,提高钻井效率,进而落实可采储量.%Wushi Sag in Beibuwan Basin is a complex fault-block oil and gas reservoir.The exploration and development face severe challenges:huge risk drilling operation,difficult logging data getting,and so on.So it is particularly important to elaborately describe the tructural characteristics of the faults and fractures around the borehole.Dipole acoustic reflection imaging technology can effectively solve the problems.In this article,the structural image characteristics of faults around the borehole and the azimuth resolution of dipole shear wave were forward modeled and analyzed.Using two wells as examples,detecting and description of small fault features were validated by the interpretation result of remote acoustic reflection imaging tool.During oilfield exploration and evaluation stage,this technology is very useful to optimize drilling design,prevent operation risk,increase the drilling efficiency,and clear the recoverable reserves.