子洲气田山2气藏气井产水成因研究

GENESIS OF PRODUCED WATER IN SHAN_2 RESERVOIR OF ZIZHOU GAS FIELD

在岩性气藏开发过程中,气井产水存在多种类型,气水分布在纵向和横向上都相对复杂.以子洲气田山2气藏为例,根据试气、测井和生产动态资料,将气井产水划分为纯水层、致密水层和气层产水3种类型,每种类型都受成藏环境、构造条件、储层岩性与物性等方面控制.除正常边底水类型的纯水层外,在岩性气藏部分井区中,由于储层条件变差,气体驱替能量不足,造成孔隙中水未受到天然气的大规模排驱而残留了大量地层水,形成致密水层和气层产微量地层水.

The type of underground water is quite confusing.in lithologic gas reservoir ,which has complex distribution of aquifer spatially.To take the Shan 2 gas reservoir in Zi Zhou gas field as an example, based on wire-line logging and trial production information, the origination of produced water is classified as aquifer、tight sand aquifer and remnant water in payzone, and the discrimination between them is also clarified.It is concluded that the distribution of sand channel ,the micro-tectonics of the zone, the migration process of hydrocarbon and the heterogeneity of sand are the controlling factors of aquifer distribution in lithologic gas reservoir.Besides the normal aquifer,due to the deficiency of gas energy, the local tight zones in some parts of sand body permit the preservation of abundant formation water ,the typical tight aquifer and remnant water in payzone is formed.The classification of aquifer can be a key role in the deployment of production well and offers reference for the development of the seminal gas reservoir.