气水过渡带和天然气成藏圈闭闭合度下限问题讨论——以莺歌海盆地高温高压带气藏为例  

Discussion on Gas-water Transition Zone and Accumulation Closure Limit:A Case of Gas Reservoir in High Temperature and High Pressure Belts of Yinggehai Basin

作　　者：吴红烛[1,2] 黄志龙[1] 童传新 黄保家 刘平 魏国 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]浙江省地球物理地球化学勘查院,浙江杭州310005 [3]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《天然气地球科学》2015年第12期2304-2314,共11页Natural Gas Geoscience

基　　金：国家科技重大专项项目(编号:2011ZX05023-004-008)资助

摘　　要：储层的物性和孔隙结构不仅控制气藏的含气饱和度,也控制气水过渡带的厚度。但它们之间有无定量关系呢?是否可以进行有效的预测?这对于评价圈闭的有效性和天然气勘探部署具有重要的现实意义。本文通过储层样品半渗透隔板实验、储层物性和隔层等方面的研究,结合莺歌海盆地实际地质资料的分析,提出了气水过渡带厚度的预测方法和成藏圈闭闭合度下限的概念。研究表明,气藏气水过渡带与孔隙度,特别是渗透率具有良好关系,说明储层孔隙结构是控制气藏气水过渡带厚度的主要因素,储层的隔层也会影响气水过渡带的分布。莺歌海盆地中深层天然气成藏的圈闭闭合度下限为7m,经济成藏闭合度下限为12m。The reservoir physical property and pore structures not only control the gas saturation of a gas reservoir,but also influence the scale of the gas-water transition zone. However,whether there is a quanti tative relationship between them and whether we can predict it effectively are unknown. But it is of significance to the trap evaluation and gas exploration. In this paper,based on the research of semipermeable partition experiment, reservoir physical properties and interlayers, combined with the analysis of the actual geological data in Yinggehai Basin, the method to predict the thickness of the gas-water transition zone and the concept of the accumulation closure limit are proposed. The research results show that there are good correlations between the thickness of gas-water transition zone and reservoir physical properties （especially permeability）. It suggests that the reservoir pore structure is the main factor to control the thickness of gas-water transition zone,and the interlayers also affect the distribution of gas-water transition zones. Furthermore,the trap closure limit is 7m,and economic accumulation closure limit is 12m in mid-deep strata of Yinggehai Basin.

关 键 词：莺歌海盆地 高温高压带 储层非均质性 气水过渡带 成藏闭合度下限 

分 类 号：TE122.1[石油与天然气工程—油气勘探]