昌德致密砂岩气藏天然气运聚动平衡特征研究

方法 在估算昌德致密砂岩气藏各地质时期供气量和扩散量的基础上，建立了昌德天然气三种运聚动平衡模式，进而对其各地质时期的剩余气量、赋存气量和累积赋存气量进行研究。目的 对于准确估算昌德地区天然气储量及研究其形成历史具有重要意义。结果 建立了天然气运聚动平衡模式。其中第一种模式，气藏储量增加，有利于气藏中天然气的聚集与保存；第二种模式，气藏储量既不增加也不减少；第三种模式，气藏储量减小，不利于天然气的

Study on features of dynamic balance of gas migration and accumulation in tight sandstone gas rcservoir of Changde

Method Three types of dynamic balance modes of gas migration and accumulation are set up for Changde tight sandstone gas reservoir on the basis of estimating thc amount of gas supplying and diffusing during cach geological period, and then the remaining,depositing and accumulative depositing gas amount of cach geological period are also studied. Purpose This research is very important for estimating the exact gas reserves of Changde and studying its forming history. Result Dynamic balance modes of gas migration and accumulation are set up. The first mode is that increased gas reserves is advantageous to accumulating and preserving of natural gas in gas reservoir; the second mode is gas reserves neither inereases nor decreases; the third mode is decreased gas reserves is disadvantageous to accumulating and preserving of natural gas. Conclusion Qingshankou period, Yao jia period and NenJiang period are the main periods of forming of Changde gas reservoir; the important condition of forming and preserving of Changde gas reservoir is that its gas supplying amount is much more than its diffusing amount during each geological period.