频散AVO分析技术及其在南海深水区的应用  

A method of frequency dispersion AVO analysis and its application in deep water area of South China Sea

作　　者：张益明 牛聪 韩利 叶云飞 

机构地区：[1]中海油研究总院,北京100028

出　　处：《中国海上油气》2016年第6期21-27,共7页China Offshore Oil and Gas

基　　金："十二五"国家科技重大专项"少井或无井条件下小波域储层流体识别方法研究(编号:2011ZX05025-001-07)"部分研究成果

摘　　要：深水区勘探钻井稀少,由于缺乏测井约束,地震反演等常规技术油气检测的多解性很强。基于地震波衰减的频散现象,在地震谱分解基础上,提出应用频率依赖的AVO方程计算地震波的频散属性的方法,并设计理论模型验证了这种频散属性对含气性识别的高敏感度,进而将AVO属性与频散属性相结合构建了一种烃类指示因子(DvP×DG)。应用频散AVO分析技术对南海深水区Y21-1构造区目的层系含气性进行了钻前预测,结果与实钻结果吻合较好,证实了频散AVO分析技术可以增强气层识别的敏感度,降低水层等背景带来的影响,可以作为烃类检测指标进行含气性识别。Conventional technologies such as seismic inversion can generate multiple solutions for hydrocar-bon detection because of few drilled wells in deep water area and lack of logging constrained. According to the seismic wave attenuation and velocity dispersion, the frequency-dependent AVO equation is used to cal-culate the dispersive properties of seismic wave based on seismic spectrum decomposition. By designing theoretical model, the high sensitivity of dispersion properties to gas detection is verified, and hydrocarbon indicator factor （DvP×DG） is constructed by combining frequency dispersion analysis with AVO attrib-utes. The method is applied to forecast the target formation gas-bearing possibility of Y 21-1 structure area in deep water area of China South Sea before drilling, and the predicted results are in good correspondence with actual drilling results, which imply that the frequency-dispersion AVO can increase the sensitivity of the gas reservoir, reduce the effects of water background, and can be used to detect gas as a hydrocarbon detection indicator.

关 键 词：地震波衰减 谱分解 AVO方程 频散属性 含气性识别 南海深水区 

分 类 号：P631[天文地球—地质矿产勘探]