Erdos Basin In South Central Upper Paleozoic Tight Gas Reservoir Forming Mechanism And Distribution Law

Based on the data obtained, together with the previous corresponding investigations, underthe guidance of principles and methods of Sedimentology, Petrelcum Geology, Well logging,Hydrocarbon accumulation, it came to the conclusion that upper paleozoic group has thefavorable condition of petroleum formed, have vast potentials for hydrocarbon accumulation.stratigraphic features, hydrocarbon generating characteristics, migration of gas，gasreservoir preservation conditions, types of gas reservoir, control factors and mechanism ofgas water distribution of the target formation were studied by different degrees.The hydrocarbon generation simulated results show that hydrocarbon-generation intensity2of the source rock between30X10~8m~3/km~3and50X10~8m/km~2, the hydrocarbon-geneartioni3ntensity above25X10~8m~3/k~2m cover the whole study area, has the characteirstics of largeareas hydrocarbon generating. According to the reservoir characteristics, hydrocarbongenerating characteristics, gas water distribution, the study area has close vertical migration,mostly near accumulation, no massive long distance horizontal migration.Contact relationship of target layer sand body diversity, the gas bearing properties degreebetween the sandstone difference, so the characteristics of gas reservoir spatial distributionbetween the reservoir is very complex, a quasi continuous contact between hydrocarbon,combined with the characteristics of target layer density reservoir, it is concluded that thetarget layer of reservoir type is quasi continuous fine gas sands reservoir. Based on the studyresults, this study has predicted the favorable area.