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在岩心观察基础上,通过应用全岩主量元素分析、显微镜下常规与铸体薄片观察鉴定和定量统计、图像孔喉分析、物性测试、X-射线衍射分析、包裹体荧光分析、均一温度与激光拉曼探针成分分析等多种手段,研究了松辽盆地营城组火山岩岩性和火山岩储层成因;结合成岩作用与储集空间特征研究,分析了火山岩储层孔隙演化过程。结果表明,火山岩经历了冷却成岩作用、岩浆期后热液作用、风化淋滤剥蚀作用以及埋藏成岩作用等4个成岩作用阶段。火山岩储层的形成、孔隙演化和储集性能的改善主要与火山岩在浅埋A期后期-深埋成岩B期成岩过程中的断裂、不整合面及构造裂缝的发育以及热液流体沿断层、不整合面和构造裂缝流动的过程中对火山岩产生溶蚀作用密切相关,营城组火山岩属于构造-岩性火山岩气藏。
On the basis of the observation of the cores, the main elements of the whole rock were analyzed, the conventional observation and quantitative observation of cast thin films under microscope, pore throat analysis, physical property test, X-ray diffraction analysis, fluorescence analysis of inclusions, Laser Raman probe composition analysis and other means to study the volcanic lithology and volcanic reservoir of Yingcheng Formation in Songliao Basin. Based on the study of diagenesis and reservoir space characteristics, the pore evolution of volcanic reservoir is analyzed. The results show that the volcanic rocks experienced four stages of diagenesis: cooling and diagenesis, hydrothermal fluid after the magmatic period, weathering and leaching and denudation, and burial diagenesis. The formation of volcanic reservoirs, the improvement of pore evolution and reservoir properties are mainly related to the development of faults, unconformities and tectonic fractures of diagenesis of volcanic rocks during the late Shallow burial stage A-B, In the process of unconformity and tectonic fracture flow, the dissolution of volcanic rocks is closely related to each other. The Yingcheng Formation volcanic rocks belong to tectono-lithic volcanic gas reservoirs.