The Origin And Reseroir-Forming Model Of Deep-Seated Natural Gas In The South Of Songliao Basin

The origin and reservoir-forming model of deep-seated natural gas are two important contents in the study of naturl gas prove.The origin of naturl gas has important connection with the principal part aspect of naturl gas prove,the different origin gas has different orderliness in the stratum, for example: usually, the biology-gas distributing in the compare shallow stratum,the oil-type gas distributing in the middling-depth stratum,the coal-derived gas distributing in the compare deep stratum,and the abio-gas distributing in the more deep stratum.And that,different type's gas has different origin,the different hydrocarbon-generation can make different types naturl gas,and the abio-gas has manifold origin,such as the mantle derived gas releasing and Carbonate decomposition. Thus,the right compartmentalization has important function of directing.Recently,how to exactly compartmentalize the type of naturl gas,anyone has yourself opinion,but the Jinxing Dai and Yongchang Xu's Carbon isotope distinguishing plate method make many people ratify.Text choose the Carbon isotope distinguishing plate to classify naturl gas with the geological diathesis,and use the methane regression equation to differentiate the oil-gas and coal-derived gas,and use the gas component of the gas reservoir to compartmentalize the naturl gas'type of Changling and Dehui faulted depression.The result of study show that the deep-seated natural gas'type of Dehui faulted depression mostly is oil-gas,coal-derive gas and the mixed gas both of them,and the deep-seated natural gas'type of Changling faulted depression mostly is coal-derived,the mantle derived CO₂,mixed gas and little N2. Warrant the result of compartmentalizationt make a sheet"The deep-seated natural gas'type distributing chart in the south of songliao basin".and"The deep-seated portrait natural gas'type distributing table in the south of songliao basin",renew and consummate the old result to make the deep-seated naturl gas'type in the south of Songliao basin has a system and all-sided result.Text coalescent the characteristic of the south of Songliao basin gas reservoir'type,chose the Changling faulted depression to study the reservoir-forming model of deep-seated natural gas,because the reservoir-forming model of naturl gas representate the potential naturl gas reservoir's characteristic, exactly making a sheet of the reservoir-forming model is very important.Making three sheet idiographic reservoir-forming model charts and a sheet of the general reservoir-forming model charts. By the study to the naturl gas in the Changling faulted depression,the mostly is CO₂ preserved in the yingchen group, the mixed gas both of CO₂ and CH4 is also preserved in the yingchen group,the secondly CH4 is preserved in the denglouku group,the last is CO₂ or CH₄ preserved in quantou group.This gas reservoir is lithology gas reservoir master of the faultage. Especially have the deep and big faultage by the CO₂ gas reservoir ,the result of study about CO₂ is mantle derived gas releasing,there are two ways that the releasing of CO₂,oen is lava,another is faultage. Organic hydrocarbon gas is preserved aloft the CO₂ gas reservoir,mostly preserved in sandstone of the denglouku group.In a word, the origin and reservoir-forming model of natural gas are two important contents in the study of naturl gas prove. Effectual compartmentalize the type of naturl gas and make the reservoir-forming model of naturl gas.The most purpose of text is to establish basic for another.