基于匹配追踪的瞬时能量异常属性在Albertine地堑油气预测中的应用

东非裂谷Albertine地堑是当今世界油气勘探的热点地区之一,具有埋藏浅、演化快、地层新的地质特点。作为主力含油气层段的新生代地层中疏松砂岩异常发育,物性参数差异较大,受控于孔隙度以及孔隙流体的综合影响,含油气储层的地震响应无明显规律,油气预测难度较大。基于能量吸收分析思想的指导,在利用匹配追踪时频分解方法有效提高时频分辨率的前提下,进一步提出瞬时能量异常属性的计算方法。以Albertine地堑的W油田为例,针对含油气储层表现的低频能量增加、高频能量衰减的异常特征,借助瞬时能量异常属性实现了油气预测,预测结果获得了钻井的验证。 

Instantaneous Energy Anomaly Attribute Based on Match Pursuit and its Application in Hydrocarbon Detection of Albertine Graben

Albertine Graben is one of the hot regain of oil and gas exploration in the world, with the geological features of shallow layer, rapid evolution, and new formation. Cenozoic layer is the primary target, where un-consolidated sandstone is the reservoir type with quite different reservoir parameters. On the effect of porosity and pore-filled fluid, the seismic reflection response of hydrocarbon bearing reservoir has no rules. It is difficult to make hydrocarbon detection in Albertine Graben. The match pursuit algorithm is used to raise the time-frequency resolution in the seismic instantaneous spectral decomposition. With the help of energy absorption analysis method, the instantaneous energy anomaly attribute is proposed based on match pursuit. W oilfield is taken for example in Albertine Graben; we found the rule of hydrocarbon bearing reservoir with low-frequency energy raised and high-frequency energy attenuated. We made hydrocarbon prediction using the instantaneous energy anomaly attribute, which was verified by the drilled well.