Volcanic Gas Reservoirs In Xujiaweizi Fault-depression Study

Northern Xujiaweizi fault depression in songliao basin is a higher level of deep natural gas exploration areas, volcanic rocks in xujiaweizi fault depression are important reservoirs of natural gas. Paper in combines predecessors research results and research district hydrocarbon source rock Earth chemical features, and carbon isotope features, and fluid package body uniform temperature, and buried history and hot history of based Shang,integrated using gas heavy hydrocarbon carbon isotope and variety simulation experiment for gas source compared, calculation has Xujiaweizi broken stuck each gas hid gas type proportions, clear break stuck Central gas hid in the crude cracking gas of contribution volume. Established with inclusions of pressure recovery method of the thermal history of the basin, through the inclusion of deep natural gas reservoir pressure measurement, and burial history reconstruction of a single well, carried out a study on paleo-geothermal gradient of xujiaweizi fault depression. Xujiaweizi fault-depression study on geochemical characteristics of hydrocarbon source rock analysis showed that the yingcheng formation in xujiaweizi fault depression and the shahezi formation has plenty of source rock, whose average distributions of organic carbon contents of hydrocarbon source rocks in the 0.8%-3.3%, organic style high hydrocarbon source rocks in the study area in general are good source rocks. Yingcheng formation in xujiaweizi fault depression and the shahezi formation present oxygen-rich organic matter type characteristics of lean hydrogen, vitrinite maceral analysis advantage analysis for type III kerogen, mainly gas. Yingcheng formation in xujiaweizi fault depression and shahezi has deep, between vitrinite reflectance in the 1.8%-3.8%. Central rift have about10% oil-cracked gases contributed resource potential cannot be ignored. Yingcheng formation in xujiaweizi fault depression and the shahezi dominated of methane in natural gas with a small amount of carbon dioxide, the main type of gas predominantly coal-type gas,carbon dioxide, inorganic and organic origin are present. Through the application of laser Raman, pressure homogenization temperatures and characteristics of the fluid inclusions study showed that in xujiaweizi fault depression in 93Ma~100Ma with a geothermal gradient of 5.8 degrees. Petro Mod basin modeling software results show deep gas in xujiaweizi fault depression through vertical migration, horizontal transport distance is shorter. With the exploration of gas, volcanic gas reservoir in xujiaweizi fault depression of hydrocarbon source and proportion, gas type, reservoir filling time and restricts the formation of gas reservoirs with different types of deep gas in determination of the spatial distribution of resources. Using laser Raman and methods of fluid inclusions and basin.