地球物理技术在下刚果盆地碳酸盐岩储层预测中的应用

Application of geophysical technique in prediction of carbonate rock reservoir in Lower Congo Basin

下刚果盆地油气资源丰富,油气成藏条件优越,但主力勘探层系白垩系孔隙型碳酸盐岩储层的分布复杂、纵横向变化快,储层预测和烃类检测难度大。针对此难题,通过精细的岩石物理分析,形成了以井震结合地震相识别和匹配追踪谱分解分析等技术为手段的碳酸盐有利相带预测技术,建立了融相控建模、叠前联合弹性参数预测及物性直接预测于一体的物性预测技术。在此基础上,对远景目标以吸收衰减和拉梅弹性参数分析为主进行含油气性风险评估。形成了一套适合研究区及类似区域的碳酸盐岩储层预测技术系列,并在此基础上对研究区的碳酸盐岩有利储层空间展布进行了预测。该技术系列、方法和研究思路对类似区域的储层预测和烃类检测有一定的借鉴意义。

Hydrocarbon resources are abundant in Lower Congo Basin.But the distribution of carbonate rock reservoir is quite complex,which varies greatly in vertical and horizontal.The difficulty arises in reservoir prediction and hydrocarbon detection.First,the prediction technique of favorable facies is provided by combining waveform analysis technique and frequency division technique.Based on this,the direct and indirect physical property prediction technique is formed by combining the poststack phase control inversion technique,prestack inversion technique,seismic multi-attribute analysis technique and frequency division physical property prediction technique.At last,the hydrocarbon detection technique is provided by combining lame elastic parameter technique and absorption coefficient analysis technique.A series of techniques are formed which seem to fit the bill.The favorable carbonate distribution is predicted on the basis of these techniques.These kinds of research techniques,methods and thinking would provide certain reference for reservoir prediction in this area or other similar areas.