松辽盆地营城组火山岩储层成因及储集性能演化过程

Origin and quality evolution of volcanic reservoir in the Yingcheng Formation,Songliao Basin

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。

Lithology of volcanic rocks and origin of volcanic reservoir from the Yingcheng Formation, Songliao Basin is studied,pore diagenetic evolution and forming mechanism is discussed in this paper, based upon the observation and description of drilled cores, the identification and quantitative statistics under microscope, analysis of major and trace element of whole rocks, the measurement of porosity and permeability, image pore throat of volcanic reservoir rocks, X-ray diffraction analysis for clay minerals, the determination of homogeneous temperature and chemical compositions and fluorescence of diagenetic liquid inclusions in volcanic rocks. This research is of great important theoretically and practically in understanding volcanic reservoir formation and origin, mechanism of volcanic reservoir pore evolution, impact parameters on volcanic reservoir quality, as well as in guiding hydrocarbon exploration and development and predicting prospect hydrocarbon reservoir areas. Research result shows that the four of cooling, post-magmatic hydrothermal,weathering leaching erosion and burial diagenetic phases occurred in the volcanic rocks. Formation, pore evolution and improvement of volcanic reservoir quality was closely related to faults and unconformity zones, developed structural fractures along which thermal liquids dissolved the easily dissolved materials thus resulted in developed secondary dissolution pores in the volcanic rocks during the late A stage of shallow burial （1500 2500 m） diagenetic phase to B stage of deep burial（ 〉2 500- 3 700 m）diagenetic phase. The volcanic gas-bearing pool is belong to structure-lithology controlled gas pool.