滨里海盆地Kumisbek油田南缘盐上油气成藏模式

Patterns of Hydrocarbon Accumulation in the Upper-salt Sediments in the South of Kumisbek Oilfield of Pre-caspian Basin

滨里海盆地Kumisbek油田南缘盐上勘探近几年来一直没有取得大的突破。通过分析研究区油气地质条件,结合区内探井钻探结果,认为盐岩的发育阻隔了盐下烃源岩生成的油气向盐上层系运移,盐上油源主要来自于盐上烃源岩,且油源不充足;盐上油气运移的通道主要是不整合面和断层。在对该区油气成藏条件分析基础上,建立了研究区盐上层系垂向运移-断层封堵型成藏模式,形成断层遮挡型及断层与背斜组合型两种油藏类型,并指出距离盐上深洼陷较近的、盐丘非刺穿构造上的圈闭是首选的勘探目标区。

In recent years,there hasn't been a major breakthrough in the south of Kumisbek Oilfield in Pre-caspian Basin.By analyzing oil and gas geological conditions and using drilling results,it was considered that oil and gas of sub-salt were difficult to migrate to up-salt sediments owing to the development,the main oil source was from the source rocks of up-salt.And oil source was not sufficient,the main migration channel was the unconformity and faults.On the basis of analyzing the forming conditions,establishing reservoir forming pattern of vertical migration-fault sealing,developing petroleum reservoir types of fault sealing and fault together with anticline,it is pointed out that the traps near the deep depression and non-piercement salt dome should be the first choice of exploration target area.