大牛地盒三气藏剩余气分布影响因素研究
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摘要
本文对大牛地气田盒三气藏的开发地质特征和生产规律进行研究,首先以气藏构造特征和沉积微相研究为基础,对气藏的储层非均质性和储层特征进行分析,然后结合气藏的生产动态特征,最终总结出剩余气分布的影响因素。
大牛地气田先天不足的低压、低渗储层条件,因而单井产量低,稳产难度大,目前大牛地气田对于剩余气分布研究不是很系统,针对目前存在的问题,本次开展的研究工作主要包括:构造特征研究,沉积微相分析,储层特征研究,储层非均质性研究,表征剩余气分布研究,剩余气分布的影响因素研究。
通过系统的研究分析得出:大牛地气田盒三气藏的河流相沉积进一步细分为四种主要微相类型:心滩、河床滞留、决口扇、河漫沉积微相。心滩和河床滞留沉积微相上的气井,是剩余气分布的主要地方。在储层物性相对较好的砂体上布井,天然气容易流出,单井具有相对比较高的产能,当这部分气井的单井地质储量大的时候,井间天然气的剩余储量很大。层内夹层的组合会在一定程度上改变天然气的运移方式,同时夹层的分布频率和密度的大小直接影响气水的运动规律,因此对于气井的开发有一定的影响,进而影响剩余气分布。由于气藏纵向上发育多套气层,当气井同时开发多个气层时,因气层间的非均质性以及压力差异,造成非主力层采出程度低而富集剩余气。气田井网密度越大、生产时间越长、剩余气越少。所以井网密度低的井间为剩余气富集区;生产时间短的井间聚集相对丰富的剩余气。
Based on the study of structural features and microfacies of Daniudi HE III gas reservoir, through the research on reservoir heterogeneity and reservoir features then combine with the study of production features. We summarize finally the effect factors of distribution of remaining gas.
Low porosity and permeability reservoir developed in Daniudi gas field. Single gas well has low production capacity. So it has great difficulty in stabling production. At present we have non- system study on distribution of remaining gas in Daniudi gas field. Taking into account current issues .Our study include: study of structural features, microfacies analysis, reservoir heterogeneity and reservoir features, distribution of remaining gas, effect factors of distribution of remaining gas.
Through systematic research has analyzed: Daniudi HE III gas reservoir stream facies have been further broken down into four main microfacies types: beach heart, bed residence, splay, diffuse deposition of river. Between of the gas wells on beach heart and bed residence is the main local of distribution of remaining gas. The gas wells on the sand have well reservoir properties. Natural gas outflows easily. Single well has relatively high production capacity, when the wells have big control reserves; the local between the wells has much remaining gas. Layer Mezzanine changes the way of gas migration, meanwhile their frequency distribution and density distribution impact the law of gas and water flow. So it has great effect on developing wells and affects the distribution of remaining gas further. Because of gas reservoir has much gas layers in vertical, when we develop many gas layers in one well, because of layer heterogeneity and different pressure between the layers, make the non-main production layer has remaining gas. More well density and production time, less distribution of remaining gas. So there has much remaining gas in low well density local. Short production time wells have mucht remaining gas.
大牛地气田先天不足的低压、低渗储层条件,因而单井产量低,稳产难度大,目前大牛地气田对于剩余气分布研究不是很系统,针对目前存在的问题,本次开展的研究工作主要包括:构造特征研究,沉积微相分析,储层特征研究,储层非均质性研究,表征剩余气分布研究,剩余气分布的影响因素研究。
通过系统的研究分析得出:大牛地气田盒三气藏的河流相沉积进一步细分为四种主要微相类型:心滩、河床滞留、决口扇、河漫沉积微相。心滩和河床滞留沉积微相上的气井,是剩余气分布的主要地方。在储层物性相对较好的砂体上布井,天然气容易流出,单井具有相对比较高的产能,当这部分气井的单井地质储量大的时候,井间天然气的剩余储量很大。层内夹层的组合会在一定程度上改变天然气的运移方式,同时夹层的分布频率和密度的大小直接影响气水的运动规律,因此对于气井的开发有一定的影响,进而影响剩余气分布。由于气藏纵向上发育多套气层,当气井同时开发多个气层时,因气层间的非均质性以及压力差异,造成非主力层采出程度低而富集剩余气。气田井网密度越大、生产时间越长、剩余气越少。所以井网密度低的井间为剩余气富集区;生产时间短的井间聚集相对丰富的剩余气。
Based on the study of structural features and microfacies of Daniudi HE III gas reservoir, through the research on reservoir heterogeneity and reservoir features then combine with the study of production features. We summarize finally the effect factors of distribution of remaining gas.
Low porosity and permeability reservoir developed in Daniudi gas field. Single gas well has low production capacity. So it has great difficulty in stabling production. At present we have non- system study on distribution of remaining gas in Daniudi gas field. Taking into account current issues .Our study include: study of structural features, microfacies analysis, reservoir heterogeneity and reservoir features, distribution of remaining gas, effect factors of distribution of remaining gas.
Through systematic research has analyzed: Daniudi HE III gas reservoir stream facies have been further broken down into four main microfacies types: beach heart, bed residence, splay, diffuse deposition of river. Between of the gas wells on beach heart and bed residence is the main local of distribution of remaining gas. The gas wells on the sand have well reservoir properties. Natural gas outflows easily. Single well has relatively high production capacity, when the wells have big control reserves; the local between the wells has much remaining gas. Layer Mezzanine changes the way of gas migration, meanwhile their frequency distribution and density distribution impact the law of gas and water flow. So it has great effect on developing wells and affects the distribution of remaining gas further. Because of gas reservoir has much gas layers in vertical, when we develop many gas layers in one well, because of layer heterogeneity and different pressure between the layers, make the non-main production layer has remaining gas. More well density and production time, less distribution of remaining gas. So there has much remaining gas in low well density local. Short production time wells have mucht remaining gas.
引文
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