富有机质致密岩心气体渗透率和扩散系数的联测方法

Combined measurement method for organic matter-rich compact rock core gas permeability and diffusion coefficient

Abstract

本发明公开了富有机质致密岩心气体渗透率和扩散系数的联测方法,该方法利用气体压力衰减装置完成,该装置由岩心夹持器、储气腔室、真空泵、围压泵、计算机组成,岩心夹持器分别连接真空泵和围压泵,岩心的入口端连接储气腔室和气源,岩心出口端处于封闭状态,该装置位于水浴加热系统中,本发明通过监测储气腔室内的气体向岩心中流动直至平衡的过程,得到气体压力衰减曲线,再根据真实气体状态方程、物质平衡和气体在岩石中的赋存与流动机理,将该衰减曲线划分为渗流阶段和扩散阶段,从而求得气体渗透率和扩散系数。本发明简化了测试程序,提高了实验分析效率,可为页岩和煤岩等非常规储层岩石中气体传质能力的实验评价和气井产能预测等提供数据支撑。
The invention discloses a combined measurement method for organic matter-rich compact rock core gas permeability and diffusion coefficient. The method utilizes a gas pressure attenuation device to accomplish. The device is composed of a rock core holder, a gas storage chamber, a vacuum pump, a confining pressure pump, and a computer. The rock core holder is connected to the vacuum pump and the confining pressure pump respectively, the inlet end of the rock core is connected to the gas storage chamber and a gas source, the outlet end of the rock core is in a closed state, and the device is located in a water-bath heating system. By monitoring the process of the gas in the gas storage chamber flowing to the rock core till balance, a gas pressure attenuation curve can be obtained, then according to a real gas state equation, material balance and the occurrence and flow mechanism of gas in rock, the attenuation curve is divided into a seepage stage and a diffusion stage, thus acquiring the gas permeability and diffusion coefficient. The method provided by the invention simplifies the testing procedure, improves the experimental analysis efficiency, and can provide data support for experimental evaluation of gas mass-transfer ability in shale, coal rock and other unconventional reservoir rocks, gas well productivity prediction and the like.

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