Research On Volcanic Reservoir Space Evolution, Diagenesis And Diagenetic Facies

In recent years,countries in the world made great breakthroughs in volcanic reservoir,as a special oil and gas reservoir, it received extensive attention of the petroleum industry. In present, domestic and international research on the volcanic reservoir facies studies mainly from petrographic, the lack of volcanic burial-diagenesis-tectonic evolution of the corresponding processes and diagenesis on the reservoir properties of volcanic reservoir space in the study; in addition, the research on reason of the volcanic reservoir space evolution and mechanism is relatively weak; the corresponding study of volcanic reservoir space evolution,burial history, history of hydrocarbon charge and sequence of diagenesis evolution, diagenetic facies is also part of the blank. To solve above problem, this article had done some related research.In the study area, first of all, research volcanic rocks start from the petrology, petrographic. In this study, based on the combination of casting thin sections were observed under the microscope, image analysis and petrophysical pore throat test, study volcanic reservoir space, find out different rocks,rocks facies of the reservoir space and the combination of it, and find out its characteristics on the vertical, profile, plane. Use microscope,X-ray diffraction analysis, scanning electron microscopy (SEM), inclusions cathodoluminescence (CL), laser Raman analysis of inclusions, homogenization temperature and composition measurement and other analytical testing methods to identify statistical secondary diagenetic mineral which forms first,which forms second. Use criteria for the classification to divide diagenetic stages, establish diagenetic sequence of volcanic rocks. Buried with basin-thermal history, hydrocarbon charge history, tectonic evolution of volcanic rocks to divide diagenetic facies, research diagenetic facies and composition of pores, volcanic phase in the space of communication and distribution law to determine favorable diagenetic facies types, and predict volcanic advantage of the plane distribution of diagenetic facies.Results:The area includes 4 major categories of 19 species of rock types:volcanic lava, pyroclastic lava, normal volcanic rocks, volcanic-sedimentary rocks. the mainly facies is overflow facies, the second is volcanic eruption facies,.The third is volcanic conduit facies. Reservoir space including primary, secondary two categories, the best combination of storage space are the expansion of pore corrosion-corrosion holes-cracks, expansion of pore corrosion-cracks, holes-grains (gravel) between the holes-corrosion holes--cracks. Diagenetic stage is divided into 4 diagenesis diagenetic stages:the cooling stage, the magmatic hydrothermal stage, weathering leaching stage, burial stage. Diagenetic facies is divided into 6 types,â‘ ,â‘¡types are the best diagenetic facies in the study area.