摘要
崖１３─１气田是近年来在我国南海琼东南盆地发现的大气田，剖析其成藏地质条件对今后找气具借鉴意义。研究表明，该气田的形成主要具以下地质条件：①具优越的盆地背景，气田所处的琼东南盆地和紧邻的莺歌海盆地第三系沉积巨厚，有多套烃源岩，为大气田提供了雄厚的物质基础；②莺─琼盆地新生界具高温、高压和快速沉降特征，地史中经历了断陷─断拗─拗陷三个发展阶段，这类“三段式”、晚期高温、快速沉降的热盆，极有利于天然气的生成与富集；③气田紧邻生气凹陷，储盖组合良好，处于构造带的高部位，有利于大量捕气；④具良好的封闭条件，气藏之上有压力封闭，侧翼有毛管封闭，从而使天然气得以大量保存；⑤该气田的圈闭实际是个构造与岩性、构造与地层组成的复合圈闭，在此构造背景上又有好的储集相带与之叠合，从而形成了储量大、产量高的大气田。
Ya 13─1 gas field, a big one found out in Qiongdongnan Basin of China south sea in recent years ,is of the following geological conditions:①The Tertiary deposition in Qiongdongnan Basin and Yinggehai Basin being close to the gas field has a great thickness and several sets of source rocks. which provides a rich matterial foundation for forming the gas field; ②The Cenozoic group in Yins-Qiong Basins has the characteristics of high-temperature .high-pressure and high-speed subsidence. the three development stages of fault-fall-fault-sag-depression are through geologic history and this kind of thermal basin is favourable for the growth and enrichment of natural gas; ③The gas field is close to source sag, has a favourable reservoir-caprock combination and is in structural belt's high position,which is good for heavy catching gas;④The gas field has favourable confining condition; ⑤The trap of this gas field is a composite one combining structures with lithology and strata.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1994年第2期1-7,共7页
Natural Gas Industry
关键词
气田
地质特征
油气田
China south sea, Qiongdongnan Basin,Ya 13─1 gas field, geologic characteristics,forming condition.
