林潼1 ,王孝明2 ,张璐1 ,曾旭1,张帅3 ,程煜宗3
Lin Tong1,Wang Xiao-ming2,Zhang Lu1,Zeng Xu1,Zhang Shuai3,Cheng Yu-zong3
摘要: 盖层的封闭能力是评价油气藏保存条件的关键。然而盖层的厚度对盖层封闭能力的作用一直存在很大的争论。研究选取与塔里木盆地超深层勘探领域油气藏盖层岩性密切相关的膏岩、盐岩和白云岩样品开展岩石长度对气体突破压力影响的实验。通过标准测试法和恒压突破法相互结合、相互印证的手段来判别岩石长度的变化对突破压力值的影响。实验结果显示:气体突破均质岩样的压力值与岩样的长度相关性不明显,但长度影响了气体的突破时间;当恒压注气初始值大于样品自身的毛管压力值时,突破时间与岩样长度呈正相关性。通过对实验数据的解析认为:现行的标准测试法中每个注气点的压力保持时间过短,造成了最终测试突破压力值偏大,影响了封闭能力测试的真实性;突破压力值与均质岩样的长度无关,但受不同测试气体的影响突破压力值有所差异;从宏观上分析厚度对盖层的物性封闭能力影响不大,但是厚度对盖层的稳定性和阻止油气的扩散起到了积极作用。
中图分类号:
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