| An Improved Method for Calculating Paleoheat Flow from Vitrinite Reflectance Profiles |
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| 作者单位： | Tang Zhonghua(Department of Math & Stats, Curtin University of Technology, Perth, W A 6845, Australia; Engineering Faculty, China University of Geosciences, Wuhan 430074);WU Yonghong,Siew P F(Department of Math & Stats, Curtin University of Technology, Perth, W A 6845, Australia);He Sheng(Department of Math & Stats, Curtin University of Technology, Perth, W A 6845, Australia; Faculty of Earth Resources, China University of Geosciences , Wuhan 430074) |
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| 基金项目： | This paper is supported by China Offshore Petroleum Exploration，Development Corporation. |
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| 摘 要： | lNTRODUCTIONIt is wel1 established that the vitrinite reflectance (R<, ) de-pends on the temperature history that a basin has undergone.In general, Ro is a function of maximum paleotemperature andeffective heating time. Thus, the paleotemperature of sedi-ments and the value of vitrinite ref1ectance are controlled by theflow of heat Q(t) into the basin and by the thermal parametersof the sediments. Therefore, in principle, it is possible to cal-culate the thermal vitrinite reflectance of …
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An Improved Method for Calculating Paleoheat Flow from Vitrinite Reflectance Profiles |
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| Tang Zhonghua,WU Yonghong,He Sheng,Siew P F. An Improved Method for Calculating Paleoheat Flow from Vitrinite Reflectance Profiles[J]. Journal of China University of Geosciences, 2001, 12(4) |
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| Authors: | Tang Zhonghua WU Yonghong He Sheng Siew P F |
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| Abstract: | Based on the models developed by Lerche et al. (1984) and Pang et al. (1993), an improved model for calculating paleoheat flow into basins is investigated. The new model is an optimization problem with the state variables governed by a thermal conduction equation. A genetic algorithm is used to solve the highly nonlinear optimization problem. As an application, the model is applied to the research into the history of heat flow in the Pearl River Mouth basin located in the South China Sea. The numerical analysis shows that the simulation results are in good agreement with the measured data and indicates that the basin may have undergone three rifting and thermal events. It is also demonstrated that a high R0 gradient reflects a response to high paleoheat flow during the early, rapid subsidence stage, while a low R0 gradient is a result of the thermal decay during the thermal subsidence because of thermal contraction of a cooling lithosphere. |
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| Keywords: | genetic algorithms paleoheat flow vitrinite reflectance. |
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