Oil & Gas Geology ›› 2011, Vol. 32 ›› Issue (3): 430-439.doi: 10.11743/ogg20110316
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Abstract: Vitrinite reflectance of the PermoCarboniferous in the north of Songliao Basin is generally high,usually more than 30%,and varies greatly in different tectonic units.The curve of vitrinite reflectance(Ro)depth(H)of the PermoCarboniferous basement in Songliao Basin has two types,which means that they have different thermal history.One is a twosection type.Vitrinite reflectance values change abruptly across the unconformity on top of the PermoCarboniferous.The Ro values and paleotemperature of the PermoCarboniferous strata under the unconformity are obviously higher than that of the overlying strata,indicating that the maximum paleotemperature of PermoCarboniferous strata had been reached before the deposition of the Early Cretaceous Denglouku Formation.The sedimentary strata deposited since the Cretaceous have no influences on the improvement of the PermoCarboniferous paleotemperature and thermal maturity.The other is a pseudolinear type.The Ro values and paleotemperature vary successively across the unconformity on top of the PermoCarboniferous strata,which shows that maximum paleotemperature of the PermoCarboniferous strata had been reached betwen the Late Cretaceous and Oligocene.The sedimentary strata since the Cretaceous contribute to the improvement of PermoCarboniferous paleotemperature and thermal maturity.Based on comprehensive analysis on vitrinite reflectance,fluid inclusion,fissiontrack age and so on,paleotemperature and thermal history of Songliao Basin is restored,and the relation between basin thermal history and hydrocarbon generation is analyzed.
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URL: http://ogg.pepris.com/EN/10.11743/ogg20110316
http://ogg.pepris.com/EN/Y2011/V32/I3/430