靖边碳酸盐岩气藏储集层渗透率模型建立方法

储集层渗透率是影响气田动态预测指标最重要的参数之一，但根据测井、岩心分析、试井等方法获得的渗透率值都不能直接用于长庆碳酸盐岩气藏的储集层建模。气田生产实践证明，试井确定的地层系数Kh值比较真实，根据各产层的产气比例（依据分层测试和建立的分层产气比例的预测模型确定），确定分层地层系数Kh值，该值与各层有效厚度的比值可得到分层渗透率值。在编制等值线图时，需要研究渗透率在不同分布区间的概率分布特征，以便使不同渗透率等值线间隔的大小及其控制的面积与渗透率出现的概率一致，从而对井间的渗透率分布进行了有效的控制。以上方法建立的渗透率模型，强调了主力产层的相对高渗，并体现出了某一区域渗透率分布的规律性，具有较强的可操作性，气井生产历史拟合证实，该方法确定的渗透率及建立的渗透率模型比较客观地反映了地层的实际渗透性，对评价气田动态指标产生了积极的影响。

The technique of permeability modeling in Jingbian carbonate gas reservoir

As one of the most important parameters that affect gas field performance forecasting index, the reservoir permeability has direct influence upon evaluation of producing reserves, single well off take potential, recovery efficiency and economy effect. The gas production has proved that flow capacity ( kh ) value obtained from well test is relatively reliable. Individual layer flow capacity ( kh ) value can be calculated from producing proportion of each effective pay zone, divided individual layer flow capacity ( kh ) value by net pay thickness can get individual layer permeability. When protracting permeability contour map, the features of permeability distributing probability should be studied for present the rules of permeability distribution, so the contour interval and control area will consistent with permeability distribution probability, and the interwell permeability can be controlled effectively. The permeability model established based on the technique discussed above is maneuverable, it put emphasis on the relative high permeability of main reservoir, and presents the permeability distributing rule of certain area. Approved by gas producing history matching, the permeability model created and permeability value calculated can reflect the real permeability value of the gas reservoir impersonally.