反向正断层在松辽盆地南部油气聚集中的作用

油气勘探的实践成果表明,我国绝大多数含油气盆地中油气藏的形成和分布受断层分布的控制。通过对两井东—木头南区扶余油层石油地质特征、已提交探明储量区及有利区块预测结果表明,研究区通过以西南为主要物源方向的三角洲前缘砂体与北北西断层垂直或者高角度斜交的大型反向正断层的有效匹配,形成了邻凹侧具有有利富油的条件。分别通过对反向正断层形成的机制及背景、研究区发育分布特征、以及反向正断层聚油机理–模式进行研究表明,反向正断层对油气的聚集与分布有以下控制作用:控制油气聚集的类型、控制油气富集的程度、控制油气聚集的层位、控制油气聚集的部位,为今后油气勘探开发工作指明了方向。

Function of Oil and Gas Accumulation and Formation Mechanism of Antithetic Normal Faults in the South of Songliao Basin

The practice of oil and gas exploration indicates that the formation and distribution of hydrocarbon reservoir in most petroliferous basins are controlled by the distribution of the fault.The study of petroleum geological characteristics,submitted reserves in the oil region and the prediction of favorable area of the Fuyu oil bearing layer in the LiangjingEast–Mutousouth Area shows that the delta front sandstones with the provenance direction of southwest matches with large Antithetic Normal Fault with high angle fracture skew or vertical to NNW fault,which form adjacent the concave side of the favorable oil–rich conditions.In this paper,studies are made about the formation mechanism on the Antithetic normal faults and the background of the study area,development and distribution characteristics,as well as the Antithetic normal faults to oil accumulation mechanism – model and we find out that the Antithetic normal faults effects on hydrocarbon accumulation and distribution in the following respect type of oil and gas accumulation,degree of enrichment of oil and gas hydrocarbon accumulation layer,and site of hydrocarbon accumulation.Such findings are of great help in petroleum exploration and development in the future.