CRITICAL CONDITION FOR GAS ACCUMULATION IN THE DEEP BASIN TRAP AND PHYSICAL MODELING
Online published: 2003-06-20
深盆气藏是特殊机理形成的一种储层致密的天然气藏。勘探实践和物理模拟实验表明 ,深盆气成藏过程中存在一个临界地质门限 ,这一门限可以用储气砂层的临界孔喉半径表达。只有在低于临界孔喉半径的致密砂层中 ,当深盆气分子膨胀力小于致密储层孔喉毛管力与上覆水静压力之和时 ,天然气才能在水封条件下形成深盆气藏。已发现的所有深盆气藏的孔隙度均小于 1 2 %和渗透率均小于 0 .987× 1 0 -3 μm2 。常温常压下的物理模拟实验证明 :单一微细玻璃管直径大于 0 .3cm时 ,水不能封气而形成“深盆气藏”;漏斗状玻璃管的水封气门限为 0 .1 0 2~ 0 .35 9cm,且随夹角增大而减小、随注气速率增加而增加 ;单一填砂粗玻璃管的封气门限取决于所装砂粒粒径的大小 ,粒径小于 0 .0 5~ 0 .1 mm的砂粒能够封气。实验条件下和实际地质条件下的门限值差异大 ,反映了温压条件和介质的润湿性等因素对深盆气成藏门限的影响 ;所以 ,不能将地表条件下的实验结果套用到实际地质条件中去。
庞雄奇;金之钧;姜振学;宫广胜;王洪玉; . 深盆气成藏门限及其物理模拟实验[J]. 天然气地球科学, 2003 , 14(3) : 207 -214 . DOI: 10.11764/j.issn.1672-1926.2003.03.207
Deep basin gas reservoir is a kind of gas reservoir with tight sandstone and formed in a unique mechanism Exploration practice and physical modeling results show that the formation of deep basin gas reservoir is controlled by the critical condition which can be expressed quantitatively in the size of the pore throat of the sandstone reservoir Can only the gas accumulate in the tight sandstone to form deep basin gas reservoir if its expansion pressure in the underground is larger.
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