异常高压气藏天然气偏差系数的确定

摘要

Gas deviation factors in formation conditions are the critical data to calculate gas reserves. As to abnormal overpressure gas reservoirs, several methods such as experimental determination, chart and analytic model can be used to determine gas deviation factors. A case study has been carried out in abnormal overpressure gas reservoir in the lower section of the fourth member of the Xujiahe Formation, the Xinchang Gas Field. It has been concluded that in abnormal overpressure reservoirs, gas deviation factors can be determined by means of experimental determination (PVT) , chart under high pressure and LXF analytic model.%地层条件下的天然气偏差系数是用来计算气藏储量的关键数据.据文献调研,针对异常高压气藏天然气偏差系数求取问题.目前可通过实验测定法、图版法、解析模型法来确定.对现有的各种方法的适用范围进行研究,通过多种方法的对比,结合新场气田须四下亚段异常高压气藏偏差系数求取的实例分析,得出可以采用实验测定法(PVT法)、高压条件下的图版法、LXF解析模型法求取异常高压气藏的天然气偏差系数.