琼东南盆地深水区频率域油气检测技术研究及应用

Research and Application of Oil and Gas Detection Technology in Frequency Domain in Deep Water Area of Qiongdongnan Basin

随着琼东南盆地勘探扩展到深水区勘探,勘探面临较大的水深差异的影响.不同目标含油气评价受制于埋深、水深差异影响,振幅属性可类比性差;仅用振幅类属性,比如亮点技术、反演技术,识别油气具有较大局限.以双相介质理论为基础,探究双相介质条件下含油气层地震波特征,发现含油气层的强衰减造成地震主频向低频移动的现象.应用匹配追踪和高分辨率Wigner分布时频分析方法,精确分析地震波经过含油气层前后频谱差异,应用频移特征属性进行含油气检测,在琼东南盆地深水区勘探取得较好的应用效果,同时,该技术不依赖于测井数据等因素,具有极大的推广应用前景.

With the extension of exploration in Qiongdongnan(QDN)Basin to deep water area,the seismic data amplitude is poorly preserved due to the large variation of water depth and the influence of spherical diffusion compensation,etc.The evaluation of oil and gas in different targets is affected by the difference of burial depth and water depth,and the analogy of amplitude attribute is poor.There are so many limitations in hydrocarbon detection only by bright spots technique.This paper is based on the theory of dual-phase medium.The seismic wave characteristics of oil and gas bearing reservoirs are explored.The strong attenuation of oil and gas reservoirs causes the seismic main frequency from high frequency to low frequency.Time-frequency analysis is using matching pursuit and high resolution Wigner distribution.Through accurate analysis of seismic wave spectrum difference before and after passing through oil and gas reservoirs,and application of main frequency shift characteristic attributes for oil and gas detection is obtained.Good exploration effect in deep water area of QDN Basin is achieved.At the same time,the technique does not depend on logging data and other factors,so it has great application prospects.