延长东区上古生界本溪组天然气分布规律研究

发布时间：2018-04-19 12:57

本文选题：本溪地层 + 潮坪沉积　；参考：《西安石油大学》2015年硕士论文

【摘要】：本溪组是延长东南部天然气重要产层之一,对其储层特征及其与天然气富集关系的研究对本区以及盆地天然气下一步勘探具有重要意义。本文在前人研究的基础上,以沉积学、储层地质学、天然气地质学、油气成藏地质学、测井地质学等理论为指导,收集利用了本区150余口井的地质录井、测井资料以及物性分析、岩石薄片鉴定、扫描电镜、压汞、试气等资料,在对本溪组沉积特征、成岩作用、储层物性、微观孔隙结构、非均质性等方面研究的基础上,进行了储层综合分类,分析了储层的控制因素,对储层特征与天然气富集关系进行了探讨。本区本溪组地层属潮坪沉积,储层主要为潮坪石英砂岩,本溪组气藏主要发育在障壁砂坝和砂坪沉积砂体内,明显受相带的控制,与相带分布具有很好的一致性。压实作用、压溶作用、胶结作用对孔隙发育起着破坏性作用,溶蚀作用则起着使孔隙增大的作用。主要属于低一特低孔,低一特低渗储层,孔隙类型有粒间孔、粒内溶蚀孔和胶结物溶蚀孔等。储层孔隙度、渗透率存在正相关关系,渗透率的变化在一定程度上受孔隙发育的影响控制。储层物性无论是在垂向上还是平面上变化差异性都较大,储层非均质性强。研究结果表明:砂岩储层物性越好,含气饱和度越高;本溪组气藏属于典型的岩性气藏,沉积相、成岩作用是气藏富集的主控因素,其在很大程度上决定了物性好坏和气藏产能大小;鼻状构造等因素对其油气的分布富集有一定的控制作用。
[Abstract]:Benxi formation is one of the important natural gas producers in the southeastern part of Yanchang. The study of its reservoir characteristics and its relationship with natural gas enrichment is of great significance for the further exploration of natural gas in this area and the basin.On the basis of previous studies, based on the theories of sedimentology, reservoir geology, natural gas geology, oil and gas reservoir forming geology and logging geology, the geological logging of more than 150 wells in this area has been collected and utilized.Well logging data and physical property analysis, rock slice identification, scanning electron microscope, mercury injection, gas test, etc., based on the study of the sedimentary characteristics of Benxi formation, diagenesis, reservoir physical properties, microscopic pore structure, heterogeneity and so on.The comprehensive classification of reservoir is carried out, the controlling factors of reservoir are analyzed, and the relationship between reservoir characteristics and natural gas enrichment is discussed.The strata of Benxi formation in this area belong to tidal flat deposit, the reservoir is mainly tidal flat quartz sandstone, Benxi formation gas reservoir is mainly developed in barrier bar and sand flat sedimentary sand body, which is obviously controlled by facies belt, and is in good agreement with the distribution of facies belt.Compaction, pressure-solubilization and cementation play a destructive role in pore development, while dissolution plays an important role in pore enlargement.It mainly belongs to low low porosity and low low permeability reservoir. The pore types include intergranular pore, intragranular dissolution pore and cemented dissolution pore.There is a positive correlation between porosity and permeability, and the change of permeability is controlled to some extent by the development of porosity.Reservoir physical properties vary greatly both vertically and horizontally, and the reservoir heterogeneity is strong.The results show that the better physical property of sandstone reservoir, the higher gas saturation, Benxi formation gas reservoir is a typical lithologic gas reservoir, sedimentary facies and diagenesis are the main controlling factors of gas accumulation.To a great extent, it determines the physical properties and the productivity of gas reservoirs, and the nasal structure has a certain controlling effect on the distribution and enrichment of oil and gas.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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