济阳坳陷凝析气藏形成条件及成藏模式

The Formation Conditions and Patterns of Condensate Gas Reservoirs in Jiyang Depression

凝析气藏为近年来胜利油田油气勘探发现的新类型,表现为既不同于油藏又不同于气藏的一种特殊类型。济阳坳陷凝析气藏主要分布于盐湖相深层和古生界地层,凝析气藏埋藏深,具有地层温度和地层压力高、单井产能高的特点。高成熟演化是凝析气成藏的内在因素,高温高压是形成凝析气藏的外在因素,优质储层是凝析气藏富集高产的重要条件,优质盖层是维持动平衡状态的重要保障。建立了济阳坳陷凝析气藏新生新储型和新生古储型成藏模式,新生新储型主要分布于深洼陷的断裂陡坡构造带,新生古储型主要分布于靠近深洼陷的潜山构造带,并预测了两种类型凝气藏的有利分布区。

In recent years,the condensate gas reservoir was a new type of reservoirs for oil and gas exploration in Shengli Oilfield,it was presented that it was a special reservoir,which was different with oil reservoirs and gas reservoirs.The condensate gas reservoir belonged to high condensate oil and low oil in Jiyang Depression,it was mainly distributed in deep salt-lake layers and the Paleozoic strata,the condensate gas reservoir was deeply buried with the characteristics of high temperature and pressure and high productivity of single-well.High maturity evolution was one of the internal factors of condensate gas reservoirs,high temperature and high pressure was the external factors,high-quality reservoir was the important condition of the condensate gas accumulation,high-quality cover was an important guarantee of dynamic balance state.Two condensate gas reservoir models of the Cenozoic generation and Cenozoic hydrocarbon accumulation are established in Jiyang depression,the type of Cenozoic generation and accumulation reservoirs are mainly distributed in fault tectonic belt of the deep sag,the type of Cenozoic generation and Palaeozoic accumulation reservoirs are mainly distributed in the buried hill tectonic belt near the sag,and the advantageous distribution of two types of condensate gas reservoirs are forecasted.