地震反演和分频技术在深水油气勘探中的应用

Application of seismic inversion and spectrum decomposition technology in deepwater exploration

对于深水沉积盆地,由于高投入、高风险、高技术因素,有些区域内勘探程度低或无钻井,在此条件下如何更好地寻找有利区带,提高勘探成功率是最迫切的问题。为此,运用无井反演和地震分频技术对西非某深水盆地进行了研究。地震分频技术实现了在频率域内通过调谐振幅属性的对应关系来研究储层横向变化规律,经分频处理后的地震数据其解释分辨率高于常规地震主频所能达到的分辨能力,有利于确定含油气储集层边界、估算地层厚度。在无井地区开展波阻抗反演,和地震分频技术结果进行相互印证,预测了西非某深水盆地有利相带和储层的发育区带。

Due to high investment, high risk and high technology in deepwater exploration, it is crucial to boost exploration success rate and search for prospects in frontiers or some areas with low degree of exploration or even no wells. In this article, no-well wave impedance inversion and spectrum decomposition were applied to a deepwater basin in West Africa. Spectrum decomposition was em- ployed to research on reservoir lateral distribution through tuning the corresponding relationship of amplitude properties in frequency do- main. The seismic resolution after decomposition is higher than conventional seismic. This aids the researchers to delineate reservoir and estimate layer thickness. Moreover, no-well wave impedance inversion in combination with seismic decomposition can be used to predict the beneficial facies tracts and reservoirs.