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《Acta Geologica Sinica》 2006-05
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Estimation of Denudation Thickness of Mesozoic Stata in the Ordos Basin and Its Geological Significance

CHEN Ruiyin, LUO Xiaorong, CHEN Zhankun, WANG Zhaoming, ZHOU Bo Key Laboratory of Petroleum Resources, Institute of Geology and Geophysics, CAS, Beijing, 100029  
Restorations of the evolution events and basin denudation are crucial contents in basin research. Though many methods can be applied to denudation thickness calculation, these methods have many hypotheses and are limited in some detailed area. Based on the recognition of sedimentary background and exploration data, the paper discovered that the acoustic time curve are made up of several subsections in Cretaceous on the west of Ordos Basin, and that the method applying mudstone compaction curve is not adapted to calculation of Triassic denudation thickness. Based on the correlation of strata, the paper calculated the erosion thickness in these four periods with: Triassic, Middle Jurassic, Jurassic and Late Cretaceous. The results are calibrated with the method of section ties and compared with early research results. The results of restoration indicate that the hardest in the four events took place in Late Cretaceous. The results of burial history restored with the basin model program Temis-3D show that basin has experienced tilting evolution from West to South to Southeast to East since Mesozoic. The simulated result of maturity history indicates that the organic matter in Triassic could have matured before Late Jurassic. Restoration of burial history certainly promoted the cognition to hydrocarbon migration and accumulation in Ordos Basin.
【Fund】: 国家重点基础研究发展计划“973”项目(编号2003CB2146000)资助的成果。
【CateGory Index】: P618.13
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