摘要
东濮凹陷纵向上在沙三1开始出现超压现象,平面上呈"两洼一隆一带"的分布格局,其分布无论在层段上,还是平面上均较局限;超压的形成和保存,与盆地膏盐发育和分布、厚层膏盐的重力作用、稳定的构造演化条件,以及封闭的断层等有重要的关系;膏盐层的成岩脱水、流体热增压作用、烃类生成作用、粘土矿物转化产生的增压作用等,是产生极高的地层压力必不可少的因素。分析认为,异常高压在油藏封盖作用、储层的孔渗性能、流体运移以及幕式成藏等诸多方面,对东濮凹陷油气富集有重要的影响,是油藏形成的基本要素之一。
Distribution of overpressure in Dongpu depression is limited both in layer and plane section, the first overpressure is presented in SHA-3 layer vertically,a pattern of two concaves with one convex and one band is formed on the plane. The development and distribution of gypsum salt,the gravity load of the thick gypsum salt layer, the closed fault and the steady constructional and evolutionary conditions are favorable for the formation and conservation of overpressure,the diagenesis and dehydration of gypsum salt layer, the hydrothermal effect, the generation of hydrocarbon, supercharging effect from clay minerals conversion are the essential factors to form the extremelyhigh reservoir pressure. Through analysis, the following recognition can be drawn, overpressure plays a very important role in the aspect of reservoir sealing, reservoir porosity-permeability performance, fluid migration and episodic petroleum accumulation in oil and gas enrichment of Dongpu depression,overpressure is one of the basic element for the formation of reservoir.
出处
《中国矿业》
北大核心
2012年第11期70-74,共5页
China Mining Magazine
关键词
东濮凹陷
超压
膏盐岩
封盖作用
幕式成藏
Dongpu depression
overpressure
gypsum rock
reservoir sealing
reservoir sealing
