频散AVO技术在南海南部盆地深水区流体检测中的应用  

Application of dispersion AVO technique in fluid detection in deep water area of southern South China Sea basin

作　　者：张莉 雷振宇[1,2] 苌亮 骆帅兵[2] 钱星 ZHANG Li;LEI Zhenyu;CHANG Liang;LUO Shuaibing;QIAN Xing(Key Laboratory of Marine Mi?ieral Resources?Ministry of Natural Resources,Guangzhou,Guangdong 511458,China;Guangzhou Marine Geological Survey,Guangzhou,Guangdong 511458,China;Beijing Ultrado Resources Technology Inc.,BeijIng 100083,China)

机构地区：[1]自然资源部海底矿产资源重点实验室,广东广州511458 [2]广州海洋地质调查局,广东广州511458 [3]北京奥能恒业能源技术有限公司,北京100083

出　　处：《中国海上油气》2022年第5期56-63,共8页China Offshore Oil and Gas

基　　金：中国地质调查局地质调查项目“南海重点XX油气资源调查评价(编号:DD20221708)”部分研究成果。

摘　　要：地震波经过油气储层后具有较强的速度频散现象,体现在振幅随频率而变化的特性上。频散AVO技术基于地震振幅随炮检距和频率共同变化的特性,能够检测与油气饱和度有关的速度频散异常,提高流体检测精度。使用基于Smith-Gidlow的两项AVO近似公式,拓展成与频率相关的方程,在频谱分解的基础上,反演求解频散的大小。在频散AVO计算过程中,对比测试了几种频谱分解方法,确定了高分辨率的频谱分解方法。最后将频散AVO技术应用于南海南部盆地深水区的真实地震数据上,结果表明,基于流体引起的地震频散现象,使用频散AVO技术在流体检测方面具有潜力。When seismic waves pass through oil and gas reservoirs, there will be strong velocity dispersion, which is reflected by the characteristic that amplitude changes with frequency. Dispersion AVO technique, based on the characteristics that seismic amplitude changes with offset and frequency, can detect velocity dispersion anomalies related to oil and gas saturation and improve fluid detection accuracy. The two terms of AVO approximation based on Smith-Gidlow are expanded into equations related to frequency. Based on spectrum decomposition, the magnitude of dispersion is inversely solved. In the process of dispersion AVO calculation, several spectrum decomposition methods are compared and tested, and a high-resolution spectrum decomposition method is determined. Finally, the dispersion AVO technique is applied to the real seismic data of the deep water area in the southern South China Sea basin. The results show that based on the seismic dispersion phenomenon caused by fluid, the dispersion AVO technique has potential in fluid detection.

关 键 词：频散AVO 流体检测 南海南部盆地 深水区 

分 类 号：TE132.14[石油与天然气工程—油气勘探]