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加拿大西部盆地中的浅层致密气藏,由于其地层渗透率和地层压力较低,采用常规的递减分析法及物质平衡法估算的储量不准确。本文给出了两种新的储量评价方法,可以解决Medicine Hat浅层致密气藏储量估算不准确的问题。第一种是样板曲线拟合方法,该法把扩散方程(不稳定)的解析压力解与经验递减方法结合起来;第二种是扩展物质平衡法(EMB),该方法引入气体产能理论,无需依赖压力数据就可选出合适的P/Z导数。这两种方法在10个辖区2300口气井上应用,获得了极好的结果。这两种不同的方法得出了相近的产量预测值和储量估算值,由此证明它们是正确的。在解决Medicine Hat浅层致密气田遇到的各种问题及提高储量估算准确度方面,证明这两种方法都是有价值的实用方法。
Shallow Tight Gas Reservoirs in the Western Canada Basin, due to their low permeability and formation pressure, have inaccurate reserves estimated by conventional decay and mass balance methods. In this paper, two new methods of stock evaluation are given, which can solve the inaccurate estimation of the reserves of Medicine Hat shallow gas reservoirs. The first is a model curve fitting method that combines the analytic solution of the diffusion equation (instability) with the empirical subtraction method. The second is the extension of the material balance (EMB) method, which introduces the theory of gas capacity without the need Depending on the pressure data, the appropriate P / Z derivative can be chosen. Both of these methods were applied at 2300 gas wells in 10 jurisdictions and achieved excellent results. These two different approaches yield similar estimates of production and reserves and prove that they are correct. Both of these approaches prove to be valuable and practical solutions to the problems encountered in the Medicine Hat shallow gas fields and the accuracy of reserves estimates.