下刚果盆地南部渐新统浊积砂岩储层含油气性检测

摘要

下刚果盆地南部渐新统浊积水道砂岩储层埋深为1 500～2 000 m,研究区水深为1 500～1 800m,深海钻探成本大,但储层埋深适中,因此需在钻探前检测储层含油气性,以降低勘探风险.分析了盆地南部的C油田和P油田渐新统储层的地球物理特征,采用AVO近、远道振幅能量差异分析技术以及叠前地震低频含油气检测技术,利用泊松比与油气藏之间的特殊关系,建立了适用于研究区的烃类检测技术.实际应用表明,该技术具有较好的实用性.%Turbidite channels developed in southern lower Congo Basin in Oligocene Epoch are buried 1 500 ~ 2 000 m. Water depth of our survey is 1 500 ~ 1 800 m. Considering the large cost of deep sea drilling and moderate buried depth of the reservoir, petrophysical a-nalysis aimed at hydrocarbon bearing reservoir of C and P oil fields in Oligocene formation had been carried out. The relationship between Poisson's ratio and hydrocarbon reservoir was built up based on differential analysis between AVO near and far offset trace amplitude energy as well as hydrocarbon detection technique using low-frequency pre-stack seismic data. Actual application results demonstrated the effectiveness and practicability of the technology series.