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AVO是研究地震CRP道集振幅变化规律(随炮检距)的技术,能够从叠前地震数据中获取与地层岩性和含油气性相关的地震属性体,进而进行含气预测,是一门适应勘探开发发展需要的地震技术。传统的“亮点”技术适合检测Ⅲ类AVO含气异常,对于中、深层含气砂岩表现出来的Ⅰ类AVO现象无法识别。某油气田气藏富集,同时含水层也广泛分布,各类AVO现象共存。以某油气田A井为例,通过利用AVO技术,结合流体替换,寻找差异,可以有效识别深层Ⅰ类AVO含气砂岩。
AVO is a technique to study the variation law of amplitude (along with the offset) of CRP gathers. It is able to obtain seismic attributes related to formation lithology and hydrocarbon-bearing property from prestack seismic data and further to carry out gas-bearing prediction Earthquake Technology Adapting to the Exploration and Development Needs. The traditional “bright spot” technology is suitable for the detection of Ⅲ type AVO gas anomalies, which is unrecognizable for Class Ⅰ AVO phenomena in medium and deep gas-bearing sandstones. A gas field is rich in gas reservoirs, while aquifer is also widely distributed, all kinds of AVO phenomenon coexist. Taking Well A in an oil and gas field as an example, by using AVO technology, combined with fluid replacement and searching for differences, it is possible to effectively identify deep-type AVO-bearing gas sands.