东濮凹陷北部浅水成盐与油气分布初探

The Halites Formed in Shallow Water and Hydrocarbon Distribution in Dongpu Depression

张孝义¹,王运所¹,段红梅¹,张爱武²

Zhang Xiaoyi , Wang Yunsuo, Duan Hongmei

1. 中原油田分公司勘探开发科学研究院,2. 中原油田分公司技术监测中心

Research Institute of Petroleum Exploration and Development , Zhongyuan Oilfield Company, SINOPEC, Henan 457001 , P. R. China

东濮凹陷是典型的盐湖沉积盆地,油气的分布与盐膏岩的沉积有密切的关系。沙三3 亚段出现的红色地层(浅水标志) 和该凹陷的蒸发岩的沉积序列特征表明,东濮凹陷的盐岩为海侵的浅水蒸发盐。在湖盆的沉积过程中存在3 种体系域,即低水位体系域,湖盆收缩体系域和高水位体系域。不同的体系域形成不同的沉积体系,从而形成不同的生、储、盖组合。对盐的成因及其对油气分布规律的研究将有助于指导岩性油气藏的勘探。

Dongpu depression is a typical salt deposited sag. In which exists close relationship between the distribution of oil and gas and the deposition of the salt and gypsum. The red layers in member Es33( shallow water remarks ) and the depositional sequence of evaporating rocks in this depression show that the salt and gypsum in this depression were formed from the evaporating marine invasion shallow water. There are three system tracts in the depositional process of the depression ,namely the low level , the receding and the high level. The different system tract forme the different depositional system , in turn to form the different sourcereservoir-cap assemblage. The researches on the origin of the salt and its controlling effect for the distribution of the oil and gas in this depression will be the guide for the future exploration.