徐家围子断陷气藏封盖保存条件及与储量丰度关系

对徐家同子断陷气藏的解剖研究发现：盖层厚度、排替压力和气藏压力是影响徐家围子断陷气藏封盖保存能力的3个主要因素.根据3个主控因素利用加权平均法对徐家围子断陷1个气藏封盖保存能力进行了综合评价，认为徐家围子断陷1个气藏以好封盖保存能力为最多，其次是中等封盖保存能力的气藏.基于徐家围子断陷1个气藏封盖保存能力综合评价结果与其天然气可采储量丰度之间关系的研究，提出徐家围子断陷具有好封盖保存能力的气藏可采储量丰度最高，这表明要形成高可采储量丰度的气藏需要好的封盖保存能力.

Seal-preservation conditions of gas reservoirs and its relation to reserve abundances in the Xujiaweizi Fault-Depression

By anatomy of gas reservoirs in the Xujiaweizi Fault-Depression,it was considered that the seal-preservation ability of gas reservoirs might be mainly influenced by the thickness,displacement pressure of cap rocks and the pressure of gas reservoir.According to the 3 main controlling factors, by use of weighted average method, the seal-preservation ability of 19 gas reservoirs in the depression was quantitatively evaluated.It was concluded that the seal-preservation ability was good for majority of 19 gas reservoirs in the depression,and the subordinate was middle.There were not gas reservoirs with bad seal-preservation ability.Based on a study of the relation between comprehensive evaluation results for seal-preservation ability and gas recoverable reserve's abundance of gas reservoirs,it was considered that the recoverable reserve's abundance of gas reservoirs with good seal-preservation ability was the highest.It indicated that the good seal-preservation ability should be required in forming gas reservoirs with high recoverable.