摘要
崖１３─１气田在有众多断层及不整合面存在的条件下保存了丰富的天然气，其封闭闭条件主要有压力封闭和毛细管封闭，构成良好的复合型封闭。在构造顶部及其西翼断上盘主要由梅山组异常高压形成压力封闭，其东翼由三亚组显陵水组二段泥岩形成毛细管封闭，而下伏的崖城组含煤地层则由略高于胶水组气层的过剩压力和较差的岩石物性形成了良好的“封托”。正是由于这种压力、毛细管力的共同作用，因而尽管崖１３—１气田地质条件复杂，仍然在气层四周形成了一个极好的“封存箱”，并在箱内保存了丰富的天然气。在研究油气富集条件时，“封闭”是较之“圈闭”更能反映油气生、聚、散动平衡的重要条件，对天然气尤为重要，因此，今后对新生代富气盆地的研究中应加强这方面的研究。据研究，在莺歌海─琼东南盆地超压顶面之下，可能有丰富的天然气保存，是今后值得重视的勘探目标。
Abundant gas in Nanhai Ya 13- 1 gas field is reserved in the conditions with numerous fsulis and unconformity surfaces. The main confining conditions are pressure seal, and capillary seal which form favourable compound seals. The pressure seal formed by obnormal high pressure of Meishan formation is on the top of the structure and the hanging wall of its west flank. The capillary seal formed by Sanya formation and the mudstone of the member 2 of Lingshui formation is on its east flank. A good 'Sealing-bracket' formed by the excess pressure being a little higher than Lingshui gas bearing formation and worse petrophysical property is in Yacheng coal bearing formation on the footwall. Althrough Yal 3-1 gas field has complex seological conditions, a very good' mothbdlled box' is formed all around the gas bearing formation as the common actions of the pressure and capillary force. Abundant gas is reserved in the box. 'Seal' is an important condition being more able to reflect the dynamic balance of oil-gas source,accumulahon and disgregation thah 'trap' while studying oil-gas enrichment. So it should be enhanced to study Cenozoic rich sac bAsins. It is possible that there is abundant gss under the superpressure top surf flee of Yinggehai-Qiongdongnan basin.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1995年第3期3-7,共5页
Natural Gas Industry
关键词
崖13-1气田
封闭压力
毛细管压力
油气聚集
Ya13-1 gas field,Confining pressure,Capillary pressure,Oil-gas accumulating.
