多波AVO技术及其在川西地区实际应用中的误区陷阱分析

Multi-wave AVO Technology and It's Trap Analysis in the Application in Western Sichuan Province

AVO(振幅随偏移距的变化)技术在解决复杂储层的岩性识别和流体预测方面的技术优势已经被诸多应用实例和文献所证实。然而,随着多分量地震勘探逐步迈入工业化应用阶段及地震资料采集上发生的一些变化(宽方位、大炮检距),使得多波AVO技术中的一些陷阱逐步凸显。结合实际工作中碰到的问题,对多波AVO技术中的近似公式精度及适应性、多波AVO参数敏感性分析及叠前反演、多波联合对比解释等方面可能存在的误区及如何避免进行了初步讨论。尽管讨论的对象以川西为例,但却不失普遍意义,对其他工区同样具有一定的指导意义。

The technical advantages of application of AVO in lithologic recognition and fluid prediction in complex reservoirs have been proven by examples and documents.However,as the multi-component seismic exploration gradually entering into the stage of industrial application,some changes(wide azimuth and large offsets) were taken place,and some of the traps were appeared in the multi-wave AVO technique.In practical production,AVO technique often encountered some potential errors,which were overlooked in the past production processes.Combined with the problems occurred in practice,the potential misunderstanding to the precision and adaptability of the approximation equations,multi-wave AVO parameter sensitivity analysis,prestack inversion,multi-wave comparison of combined interpretation and how to avoid it is preliminarily discussed.Although the discussion is based on the example from Western Sichuan Province,it is instructive to the other working areas.