一种页岩气水平井气层产气性的录测井评价方法

A Kind of Logging Evaluation Method for Shale Gas Production of Horizontal Well

由于国内页岩气开发起步相对较晚,包括页岩气水平井地质导向后水平段气层产气性定量评价在内的许多关键技术研发仍处于空白状态。为了进一步丰富现有的页岩气储层录测井定量评价方法,在分析传统的产气性评价方法的基础上,采用Delphi法优选建模参数,建立一种利用工区均方根产能指数预测页岩气井水平段气层无阻流量的方法,进而实现页岩气水平井气层产气性的录测井定量评价。四川盆地某页岩气田65口井的应用显示,无阻流量计算误差平均不超过±20%,产气性评价符合率达到93.8%,能够满足页岩气水平井随钻地质导向后的水平段页岩气层产气性评价需求。

Shale gas development is relatively slow in China. There are many technology gaps to fill, inclu- ding quantitative evaluation of gas production of horizontal part after geo--steering. In order to further en- rich the logging quantitative evaluation methods of shale gas reservoir, on the basis of traditional production evaluation method, using the Delphi method to optimize modeling parameters, a new prediction method of open flow gas of horizontal part is invented with RMS of work area capacity index, then the horizontal well production gas logging quantitative evaluation of shale gas is realized. Application of this method in 65 wells of Sichuan basin, open--flow capacity calculation error is not more than ＋ / - 20% on average, the coinci- dence rate of production capability evaluation reach 93.8 %, which can meet the need of the shale gas produc- tion capability assessment requirements for horizontal well drilling after geo--steering.