Productions of Closed System Experiments for Middle Permian Source Rock in Southern Junggar Basin
After two source rocks samples in the Yaomoshan and Dalongkou sections in Junggar basin are subjected to closed system experiment,we get the amounts of hydrocarbon generation and the geochemical parameters and set up a mode of hydrocarbon generation for the kerogenⅠand Ⅱ1 source rocks at different temperature conditions.The intensity of the different gas constitutes generated from the middle Permian source rock in southern Junggar basin is computed by choosing the related geochemical parameters and the thickness of the mudstone.The results indicate that the amount of oil and gas generation from the typeⅠkerogen is more than that of type Ⅱ1 kerogen.The duration of oil generation of the typeⅠkerogen is from 0.6% to 2.0% RO,in contrast that the thermal maturity for the type Ⅱ1 kerogen is in range of 0.7%-1.3%.The type kerogen begins to generate the gas at RO of 1.3%,and the amounts of gas production go up with thermal maturity increase;the type Ⅱ1 kerogen onset the gas generation at RO of 1.0%.Although the time of gas generation is earlier than that of the type Ⅰ kerogen,the gas production in volume is less than that of the type Ⅰ kerogen.In three geological sections,the gas generation intensity in the Dalongkou section is largest,about 167.52×108m3/km2,with the largest intensity of methane and ethane,the Yaomoshan section is second,about 118.88×108m3/km2,and the last is the Hongyanchi section,about 11.46×108m3/km2.So,the gas generation potential in the Southern Junggar basin is great with extensive exploration
QIN Li-Ming, ZHANG Zhi-Huan, ZHU Lei, LIU Hong-Jun, XI Wei-Jun . Productions of Closed System Experiments for Middle Permian Source Rock in Southern Junggar Basin[J]. Natural Gas Geoscience, 2011 , 22(5) : 860 -865 . DOI: 10.11764/j.issn.1672-1926.2011.05.860
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