AVO技术在铁匠炉地区油气检测中的应用

摘要

The lithologic-stratigraphic reservoirs of Shahejia Formation in Tiejianglu slope belt have complex oil/water relationship.The prestack seismic data with relative amplitude preservation contain more information about lithology and fluid than the poststack seismic data.Therefore,the prestack seismic data can be used for hydrocarbon detection.The primary application of prestack seismic data of Aki Richards and Shuey approximate expressions based on Zoeppritz equation in hydrocarbon detection is introduced.AVO forward modeling is conducted to define fluid-corresponding AVO abnormity,then to identify AVO abnormity across well point trace gather,and finally to interpret AVO multi-attribute body,thus to find abnormal hydrocarbon distribution zones and guide the exploration deployment in the study area.%勘探开发实践证实,铁匠炉斜坡带沙河街组岩性-地层油气藏油水关系复杂。由于叠前相对振幅保持处理的地震资料比叠后地震资料包含更丰富的岩性和流体信息,因此利用叠前地震资料进行油气检测的敏感性更强。该文主要基于Zoeppritz方程的Aki＆Richards和Shuey近似公式,利用叠前地震资料开展了油气检测方面的研究,即在进行AVO正演模拟确定流体响应的AVO异常类型基础上,提取过井点的角道集并识别AVO异常,最后对AVO反演的属性体进行解释,识别油气异常分布区域。该方法很好地指导了铁匠炉地区的勘探部署工作。