Physical and chemical environments of abnormal vitrinite reflectance evolution in the sedimentary basins |
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| Authors: | Qiu Nansheng Wang Weixiao and Xie Mingju |
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| Institution: | (1) State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, 102249, China;(2) Basin and Reservoir Research Center, China University of Petroleum, Beijing, 102249, China;(3) The First Prospecting Team, Anhui Coalfield Geological Bureau, Huainan, 232052, China |
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| Abstract: | Based on the tested data of pressure and vitrinite reflectance of some wells in sedimentary basins, abnormal high pressure
is regarded as not the only factor to retard the increase of vitrinite reflectance (R
o). Apart from the types of the organic matter, the physical environment (temperature and pressure) and chemical environment
(fluid composition and inorganic elements) will result in the abnormal vitrinite reflectance values in the sedimentary basins.
This paper tested trace elements and vitrinite reflectance data from the the abnormal high pressure and normal pressure strata
profiles, respectively, and found that the acidic and lower salinity starta are favorable for the increase of R
o. By discussing the corresponding relationship between the contents of some trace elements in the mudstone and the vitrinite
reflectance values, the typical trace elements were found to suppress and/or catalyze the vitrinite reflectance of organic
matter, while the elements of Ca, Mn, Sr, B, Ba and P may result in the retardation of R
o. However, elements of Fe, Co, Zn, Ni and Rb may catalyze the organic matter maturation. This study is conductive to the organic
maturation correction, oil and gas assessment and thermal history reconstruction by the paleothermometry.
Translated from Acta Geologica Sinica, 2006, 80(11): 1760–1769 译自: 地质学报] |
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| Keywords: | vitrinite reflectance trace elecment retardation/catalysis abnormal pressure |
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