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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。
Reservoir physical properties and pore structure not only control the gas saturation of gas reservoirs, but also control the gas and water transition zone thickness. But is there a quantitative relationship between them? Is it possible to make effective prediction? It is of great practical significance to evaluate the effectiveness of traps and the exploration and deployment of natural gas. Based on the research of reservoir semi-permeable separator, physical properties and interlayer of reservoir samples and the analysis of the actual geologic data in Yinggehai Basin, this paper presents a prediction method of the thickness of gas-water transitional zone and the prediction of closure of reservoir trap The concept of the lower limit. The results show that there is a good relationship between the gas-water transition zone and the porosity, especially the permeability, indicating that the reservoir pore structure is the main factor to control the gas-water transitional zone thickness. The interlayer of the reservoir also affects the gas-water transition Belt distribution. The lower limit of trap closure of middle-deep natural gas reservoirs in Yinggehai Basin is 7m, and the lower limit of closure of economic reservoirs is 12m.