Present temperature field and Cenozoic thermal history in the Dongpu depression,Bohai Bay Basin,North China |
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| Institution: | 1. State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China;3. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao 266590, China;4. Research Institute of Exploration and Development, Zhongyuan Oilfield, SINOPEC, Henan 457001, China;5. Geological Exploration & Development Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610059, China;1. State Key Laboratory of Petroleum Resources and Engineering, Beijing 102249, China;2. Wuxi Research Institute of Petroleum Geology, Sinopec Petroleum Exploration & Production Research Institute, Wuxi 214151, China;3. Unconventional Natural Gas Institute, China University of Petroleum, Beijing 102249, China;4. Geology Scientific Research Institute of Shengli Oilfield Company, Sinopec, Dongying 257015, China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China;2. College of Geosciences, China University of Petroleum (Beijing), Beijing, 102249, China;3. Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, T2N 1N4, Canada;4. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Sichuan Chengdu, 610041, China;1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;2. China University of Geosciences, Beijing 100083, China;3. PetroChina Xinjiang Oilfield Company, Kelamay 834000, China;1. PetroChina Exploration and Development Research Institute, Beijing 100083, PR China;2. College of Earth Sciences, Jilin University, Changchun 130061, PR China;3. School of Geosciences, China University of Petroleum, Qingdao 266580, PR China |
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| Abstract: | The Dongpu depression is located in the southern Bohai Bay Basin, North China, and it has abundant oil and gas reserves. There has been no systematic documentation of this depression's temperature field and thermal history. In this article, the present geothermal gradient and heat flow were calculated for 68 wells on the basis of 892 formation-testing data from 523 wells. Moreover, the Cenozoic thermal history was reconstructed using 466 vitrinite reflectance data from 105 wells. The results show that the Dongpu depression is characterized by a medium-temperature field between stable and active tectonic areas, with an average geothermal gradient of 34.8 °C/km and an average heat flow of 66.8 mW/m2. The temperature field in the Dongpu depression is significantly controlled by the Changyuan, Huanghe, and Lanliao basement faults and thin lithosphere thickness. The geothermal gradient twice experienced high peaks. One peak was during the Shahejie 3 Formation depositional period, ranging from 45 °C/km to 48 °C/km, and the second peak was in the middle and late of the Dongying Formation depositional period, ranging from 39 °C/km to 40 °C/km, revealing that the Dongpu depression experienced two strong tectonic rifts during the geothermal gradient high peak periods. The geothermal gradient began to decrease from the Neogene, and the geothermal gradient is 31–34 °C/km at the present day. In addition, these results reveal that source rock thermal evolution is controlled by the paleo temperature field of the Dongying Formation depositional period in the Dongpu depression. This study may provide a geothermal basis for deep oil and gas resource evaluation in the Dongpu depression. |
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| Keywords: | Dongpu depression Bohai Bay Basin Present temperature field Heat flow Thermal history Source rock thermal evolution |
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