Tectono–Thermal Evolution, Hydrocarbon Filling and Accumulation Phases of the Hari Sag, in the Yingen–Ejinaqi Basin, Inner Mongolia, Northern China |
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作者姓名: | YANG Peng REN Zhanli XIA Bin TIAN Tao ZHANG Yong QI Kai REN Wenbo |
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作者单位: | 1 State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069,
China
2 Guangdong Key Laboratory of Offshore Oil Exploration and Development, School of Marine Science,
Sun Yat–sen University, Guangzhou 510006, China
3 Radiogenic Isotope Facility, School of Earth and Environmental Sciences, The University of Queensland,
Brisbane Qld 4072, Australia,1 State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069,
China,2 Guangdong Key Laboratory of Offshore Oil Exploration and Development, School of Marine Science,
Sun Yat–sen University, Guangzhou 510006, China;4 State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences, Guiyang 550002,
China,5 Key Laboratory Coal Resource Exploration and comprehensive Utilization, Ministry of Land and Resources,
Xi’an 710026, China,2 Guangdong Key Laboratory of Offshore Oil Exploration and Development, School of Marine Science,
Sun Yat–sen University, Guangzhou 510006, China,1 State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069,
China and 1 State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069,
China |
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基金项目: | This study was supported by the project of “Constraints on Lithospheric Dynamic Evolution and Hydrocarbon Accumulation from Late Mesozoic Paleo-geothermal Field in Ordos and Qinshui Basins" (grant No. 41630312), the National Nature Science Foundation of China (grants No. 41372208 and 40534019), and the Open Found of the State Key Laboratory of Ore Deposit Geochemistry, CAS (grant No. 201304). In addition, this study supported by international program for Ph.D. candidates, Sun Yat-Sen University. |
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摘 要: | This work restored the erosion thickness of the top surface of each Cretaceous formations penetrated by the typical well in the Hari sag, and simulated the subsidence burial history of this well with software BasinMod. It is firstly pointed out that the tectonic subsidence evolution of the Hari sag since the Cretaceous can be divided into four phases: initial subsidence phase, rapid subsidence phase,uplift and erosion phase, and stable slow subsidence phase. A detailed reconstruction of the tectonothermal evolution and hydrocarbon generation histories of typical well was undertaken using the EASY R_0% model, which is constrained by vitrinite reflectance(R_0) and homogenization temperatures of fluid inclusions. In the rapid subsidence phase, the peak period of hydrocarbon generation was reached at c.a.105.59 Ma with the increasing thermal evolution degree. A concomitant rapid increase in paleotemperatures occurred and reached a maximum geothermal gradient of about 43-45℃/km. The main hydrocarbon generation period ensued around 105.59-80.00 Ma and the greatest buried depth of the Hari sag was reached at c.a. 80.00 Ma, when the maximum paleo-temperature was over 180℃.Subsequently, the sag entered an uplift and erosion phase followed by a stable slow subsidence phase during which the temperature gradient, thermal evolution, and hydrocarbon generation decreased gradually. The hydrocarbon accumulation period was discussed based on homogenization temperatures of inclusions and it is believed that two periods of rapid hydrocarbon accumulation events occurred during the Cretaceous rapid subsidence phase. The first accumulation period observed in the Bayingebi Formation(K_1 b) occurred primarily around 105.59-103.50 Ma with temperatures of 125-150℃. The second accumulation period observed in the Suhongtu Formation(K_1 s) occurred primarily around84.00-80.00 Ma with temperatures of 120-130℃. The second is the major accumulation period, and the accumulation mainly occurred in the Late Cretaceous. The hydrocarbon accumulation process was comprehensively controlled by tectono-thermal evolution and hydrocarbon generation history. During the rapid subsidence phase, the paleo temperature and geothermal gradient increased rapidly and resulted in increasing thermal evolution extending into the peak period of hydrocarbon generation,which is the key reason for hydrocarbon filling and accumulation.
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关 键 词: | fluid inclusion erosion thickness subsidence burial history tectono–thermal evolution hydrocarbon generation history hydrocarbon accumulation phase Inner Mongolia China |
收稿时间: | 2016/7/17 0:00:00 |
修稿时间: | 2017/12/8 0:00:00 |
Tectono–Thermal Evolution,Hydrocarbon Filling and Accumulation Phases of the Hari Sag,in the Yingen–Ejinaqi Basin,Inner Mongolia,Northern China |
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Authors: | YANG Peng REN Zhanli XIA Bin TIAN Tao ZHANG Yong QI Kai and REN Wenbo |
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Institution: | 1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, China;2. Guangdong Key Laboratory of Offshore Oil Exploration and Development, School of Marine Science, Sun Yat–sen University, China;3. Radiogenic Isotope Facility, School of Earth and Environmental Sciences, The University of Queensland, Australia;4. State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences, China;5. Key Laboratory Coal Resource Exploration and comprehensive Utilization, Ministry of Land and Resources, China |
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Abstract: | This work restored the erosion thickness of the top surface of each Cretaceous formations penetrated by the typical well in the Hari sag, and simulated the subsidence burial history of this well with software BasinMod. It is firstly pointed out that the tectonic subsidence evolution of the Hari sag since the Cretaceous can be divided into four phases: initial subsidence phase, rapid subsidence phase, uplift and erosion phase, and stable slow subsidence phase. A detailed reconstruction of the tectono–thermal evolution and hydrocarbon generation histories of typical well was undertaken using the EASY Ro% model, which is constrained by vitrinite reflectance (Ro) and homogenization temperatures of fluid inclusions. In the rapid subsidence phase, the peak period of hydrocarbon generation was reached at c.a. 105.59 Ma with the increasing thermal evolution degree. A concomitant rapid increase in paleotemperatures occurred and reached a maximum geothermal gradient of about 43–45°C/km. The main hydrocarbon generation period ensued around 105.59–80.00 Ma and the greatest buried depth of the Hari sag was reached at c.a. 80.00 Ma, when the maximum paleo–temperature was over 180°C. Subsequently, the sag entered an uplift and erosion phase followed by a stable slow subsidence phase during which the temperature gradient, thermal evolution, and hydrocarbon generation decreased gradually. The hydrocarbon accumulation period was discussed based on homogenization temperatures of inclusions and it is believed that two periods of rapid hydrocarbon accumulation events occurred during the Cretaceous rapid subsidence phase. The first accumulation period observed in the Bayingebi Formation (K1b) occurred primarily around 105.59–103.50 Ma with temperatures of 125–150°C. The second accumulation period observed in the Suhongtu Formation (K1s) occurred primarily around 84.00–80.00 Ma with temperatures of 120–130°C. The second is the major accumulation period, and the accumulation mainly occurred in the Late Cretaceous. The hydrocarbon accumulation process was comprehensively controlled by tectono–thermal evolution and hydrocarbon generation history. During the rapid subsidence phase, the paleo temperature and geothermal gradient increased rapidly and resulted in increasing thermal evolution extending into the peak period of hydrocarbon generation, which is the key reason for hydrocarbon filling and accumulation. |
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Keywords: | fluid inclusion erosion thickness subsidence burial history tectono– thermal evolution hydrocarbon generation history hydrocarbon accumulation phase Inner Mongolia China |
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