The Study On Reservoir Character Of Budate Group In Beier Sag, Hailar Basin

Hailar basin lied in suture zone of China plate and Siberian plate, it formed a fault-depressionbasin of Mesozoic-Cenozoic era in Hercynian.Beier sag is one of the second-structural unit of Hailar basin and with 3010 square kilometrers.The basin fills within Beier sag consit ofBudate Group,Xing'anling Group,Tongbomiao Formation, NantunFormation, Damoguaihe Formation,and Yimin Formation. Tak-ing Beier sag for example, the author researched thoroughly the study on reservoir characteristics of Budate group, The aim of the paper is to clarify the typt of volcaniclastic rock,the characteristics of hot fliud, and to discuss on the modification to diagenesis alteration of the volcaniclastic, These will offer advantage condition for the study on reservoir characteristics of Budate group. In this paper, many methods and techniques are utilized, such carbon and oxygen isotope measuring,lithogeochemical method testing. In addition, normal slice identification, scanning electron microscopic observation (SEM) and energy spectrum analysis, transmission polarization observation,fluorescence micros-cope analysis and Gas-Flow Heating/Freezing System, Laser-Raman ,Cathodolumines Cence Laser Scanning Confocal Microscope(LSCM) etc.are involved in this research. According to normal slice identification of abservation on the rock of Budate group, and select nud-class rock as a way to macroelement trace element rare-earth element of geochemical analysis. It is indicated that there are four type of rock in Budate group,such as clastic lava,volcaniclastic rock,volcanical-sedimentary rock,Terrigenousclastic rock. In these rock type, volcaniclastic rock and volcanical-sedimentary are mainly rock type in Budate group. nud-class rock belongs to tufaceous nudstone of volcaniclastic rock.it is affected by not only volcaniclastic substance but also Terrigenousclastic rock.in this paper scanning electron microscopic observation (SEM) and energy spectrum analysis are applied to study diagenesis alteration of the volcaniclastic rock in Budate group.the result is that compaction,corro sion and dissolutionin in the clastic mineral. sericitization is the mainly feature in the plagioclase and quartz is not corrosion. During the course of clay mineral's conversion, the content of K+ in formation water control I/S transform,the wide distribution of chlorite and the disappear of smectite are indicate to the diagenesis alteration in the mineral. The hot fluid flow frequently, there are all sort of vein in the core.the earliest formation of vein is quartz vein, then pyrites vein,cholite vein, ankerite vein,and Kaolinite vein. The curved drawing of Vitrinite reflectance (Ro)-depth is always guadual change ,but it is clear warping "Z"shape in the Suderte erea,This is a typical feature of the hot fluid flow. The homogeneous temperature of fluid inclusions is also indicate to the hot fluid flow. It is studied that the homogeneous temperature of the saltwater inclusions in the ankerite vein distributes from 122 to 190℃,and homogeneous temperature of the saltwater inclusions in the quartz vein is chaged from 99 to 211 ℃,the inclusion temperature is higher than palaeogeothermal nowadays and react to temperature field in the hot fluid interaction process. By means of transmission polarization observation, fluorescence microscope Laser-Raman ,CathodoluminesCence Laser Scanning Confocal Microscope(LSCM) analysis,the author studied fluorescence characteristic of the hydrocarbonaceous hot fluid in the micro-fracture of quartz vein and ankerite vein.there are three types of the hydrocarbonaceous hot fluid in Budate group: the primary hydrocarbon...