松辽盆地基岩储层岩石学特征研究

发布时间：2018-03-12 20:55

本文选题：松辽盆地　切入点：基岩　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：本文通过对松辽盆地周缘露头踏勘、采样、镜下分析的工作,结合盆地内钻井岩心资料及铸体薄片镜下分析的工作,对松辽盆地基岩岩石学特征进行了分析。在这一基础上,结合研究区域的地质背景,对其中有潜力作为优势储集层的部分进行了分析。在实际进行研究的过程中,共观察鉴定薄片150多张,鉴定岩性近二十种,其中不仅有变质和浅变质岩类,还有经受蚀变作用而成的蚀变岩类、岩浆活动形成的火成岩以及沉积而成的碎屑岩类。结合区域的平面地图,可以看出,本区域的变质作用并不均衡,在盆地的东南缘变质程度较高,而在盆地的西北方向变质程度较低。而在岩心薄片观察到的溶蚀孔隙,还揭示了区域风化淋滤作用的存在。松辽盆地基岩岩性多样,既有陆相环境下沉积而成的碎屑岩层,也有浅海相环境下沉积而成的灰岩等,还有岩浆运动形成的大量火成岩。在这一基础上,经受不同程度的变质作用,造成松辽盆地石炭-二叠基岩岩性多样,特征繁杂。基于本次研究所做的工作,按照变质程度排序,可以分为四个大类即变质及浅变质岩类、蚀变岩类、正常火山岩以及沉积岩类。松辽盆地基岩潜力储集层的控制因素分为两个方面,其一是岩石本身的岩性和所含矿物组分,如云母矿物易裂,长石矿物易溶,这些因素会影响岩石的储集能力;二是岩石所经历的各种区域地质作用的影响,如挤压、热变质、风化淋滤等等作用。
[Abstract]:In this paper, the petrology characteristics of the Songliao Basin are analyzed through the exploration, sampling and analysis of the outcrop around the Songliao Basin, combined with the core data of the drilling and the analysis of the casting thin slice under the mirror, on the basis of which, the petrological characteristics of the Songliao Basin are analyzed. Combined with the geological background of the study area, the potential as the dominant reservoir is analyzed. In the course of actual study, more than 150 sheets and nearly 20 kinds of lithology were observed and identified. There are not only metamorphic and shallow metamorphic rocks, but also altered rocks formed by alteration, igneous rocks formed by magmatic activity and depositional clastic rocks. The metamorphism in this region is not balanced, and the metamorphism degree is higher in the southeastern margin of the basin and lower in the northwest direction of the basin. It also reveals the existence of regional weathering and leaching. The bedrock in Songliao Basin has various lithology, including depositional clastic rock strata in continental environment and limestone deposited in shallow marine environment, etc. There are also a large number of igneous rocks formed by the magmatic movement. On this basis, they have undergone varying degrees of metamorphism, resulting in a variety of lithology and complicated characteristics of Carboniferous-Permian bedrock in the Songliao Basin. Based on the work done by this study, According to the degree of metamorphism, it can be divided into four major categories: metamorphic and shallow metamorphic rocks, altered rocks, normal volcanic rocks and sedimentary rocks. One is the lithology of the rock itself and its mineral components, such as the cleavage of mica minerals and the easy dissolution of feldspar minerals, which will affect the reservoir capacity of the rocks; the second is the influence of various regional geological processes experienced by the rocks, such as compression and thermal metamorphism, Weathering leaching and so on.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE311

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