博兴洼陷沙三段“相-势”控藏作用及油气充满度预测

Controlling of facies and fluid potential and prediction of hydrocarbon-filling degree in the third member of Shahejie Formation,Boxing Subsag

岩性油气藏是目前博兴洼陷的重要勘探领域。应用"相-势"控藏模式在该区开展了博兴洼陷沙三段不同类型岩性体"相-势"控藏作用研究,从已钻探岩性油气藏的砂体类型、埋藏深度、发育层位及构造部位等方面,分析了深水浊积扇、浊积岩和近岸水下扇的"相"控藏特征,并从地层压力方面分析揭示了"势"控藏特征。在此基础上,利用油气藏充满度综合评价方程,对不同类型的3个实例砂体进行了计算,明确了该区岩性油气藏油气充满度的差异。

The lithologic hydrocarbon reservoirs are the most important exploration targets in Boxing Sag. This paper analyzes the controlling function of facies and fluid potential to oil accumulation for the different types of lithologic reservoir in Boxing Sag. Based on the sandbody types, buried depth, reservoir horizon and tectonic position of drilled lithologic hydrocarbon reservoirs, the features of facies-controlled oil accumulation were analyzed in deep-water turbidite fan, turbidite and nearshore submarine fan. And the controlling features had been revealed in regard to the fluid potential to hydrocarbon accumulation through the study of reservoir pressure. By the use of the comprehensive evaluation equations on the hydrocarbon-filling degree, three different sandbodies were evaluated and the differences of hydrocarbon-filling degree were made sure in lithologic hydrocarbon reservoirs in Boxing Sag.