Application of Vitrinite Reflectance in Reconstruction of Pal eotemperature:Evolution of Paleotemperature in the Eastern and Western Mesozoic-Cenozoic Sedimentary Basins，China

Zou Huayao; Wu Zhiyong

Comparison and discussion were carried out with various methods,using vitrinite reflectance(VR) to re-construct paleotemperature of sedimentary basins. It was perceived that the Easy Ro algorithm is the most ac-curate method for prediction of VR and then for paleotemperature throughout the range of organic maturitynormally encountered. The Easy Ro model was cased to restore paleotemperature gradients(PG) of four sedi-mentary basins in the eastern and western China,respectively. It was indicated that the eastern basins charac-teristic of continental rift basin had higher paleotemperature gradients in the Mesozoic-Cenozoic Era thanthose characteristic of foreland basin in the western China. The eastern basins had more than 4. 0℃/ 100m ofPG from the Late Mesozoic to Early Cenozoic Era，but lower than 3. 0-2. 5℃/100m in the western basinsof China during the same period. Three of the four basins concerned,Liaohe Basin,subei Basin in the east andsantanghu Basin in the west, had a decreasing evolution in PG in Late Mesozoic, whileQaidarn Basin under-went an increasing evolution in PG,from 2. 5℃/100m to nowadays 3. 0℃/100m. The success of PG recon-structions for four basins suggested that the Easy Ra algorithm is suitable to PG reconstruction of various tec-tonically different basins.

Jianghan Petroleum Institute Hubei Jinzhou 434102

Received Date: 1997-05-24

Rev Recd Date: 1997-11-10

Publish Date: 1998-03-10

Key words:

Abstract: Comparison and discussion were carried out with various methods,using vitrinite reflectance(VR) to re-construct paleotemperature of sedimentary basins. It was perceived that the Easy Ro algorithm is the most ac-curate method for prediction of VR and then for paleotemperature throughout the range of organic maturitynormally encountered. The Easy Ro model was cased to restore paleotemperature gradients(PG) of four sedi-mentary basins in the eastern and western China,respectively. It was indicated that the eastern basins charac-teristic of continental rift basin had higher paleotemperature gradients in the Mesozoic-Cenozoic Era thanthose characteristic of foreland basin in the western China. The eastern basins had more than 4. 0℃/ 100m ofPG from the Late Mesozoic to Early Cenozoic Era，but lower than 3. 0-2. 5℃/100m in the western basinsof China during the same period. Three of the four basins concerned,Liaohe Basin,subei Basin in the east andsantanghu Basin in the west, had a decreasing evolution in PG in Late Mesozoic, whileQaidarn Basin under-went an increasing evolution in PG,from 2. 5℃/100m to nowadays 3. 0℃/100m. The success of PG recon-structions for four basins suggested that the Easy Ra algorithm is suitable to PG reconstruction of various tec-tonically different basins.

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Application of Vitrinite Reflectance in Reconstruction of Pal eotemperature:Evolution of Paleotemperature in the Eastern and Western Mesozoic-Cenozoic Sedimentary Basins，China

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