松南气田火山岩气藏产能评价及影响因素分析

Evaluation and influence factors analysis of the Gas Production of Volcanic Reservoir in Songnan Gas Field

松南气田火山岩气藏产能评价主要以修正等时试井或回压试井为主,通过"二项式"或"一点法"计算无阻流量,但是由于火山岩成藏及储层分布的特殊性,无阻流量不能完全真实反映各井产能,因此结合压降储量、单位平方压差下产气量对比及试采情况对产能进行综合评价,发现各井产能存在较大差异,通过地质分析认为产能的主控因素:火山机构、储层物性、井型及边底水影响;依此认识,松南气田下一步井位优化部署主要以S1火山机构为主,选取构造位置相对较高和古地形相对较高位置布井,井型以水平井为主,井轨迹尽可能选择高孔渗体和裂缝相对发育部位,以获得较高单井产能,同时也利于规避底水锥进的风险。

Songnan volcanic gas field production evaluate mainly in the main of modified isochronal test or back pressure test,through the ＂binomial＂ or ＂single point methods＂ calculate AOF,but due to volcanic reservoir and reservoir distribution of particularity,But AOF can＇t fully reflect the well productivity,the combination of drawdown reserves,the unit square differential pressure gas production comparison and production conditions,a comprehensive assessment found that the well productivity are quite different,through geological analysis that the capacity of the master factors： the volcanic edifice,reservoir properties,well type and the edge of bottom water;so understanding the next step in the gas well location optimization Songnan deployment,mainly in the S1 main volcanic edifice,select the structure and location of the ancient terrain is relatively higher position,well-type horizontal wells,the main track as well select the high porosity and permeability relative development of body parts and cracks in order to obtain a higher well productivity,but also help avoid the risk of bottom water coning.