SHI XiaoBin,
WANG LiFang,
REN ZiQiang et al
.2020.Cenozoic tectono-thermal evolution features and influence factors of the Liyue basin, South China Sea Chinese Journal of Geophysics(in Chinese),63(7): 2682-2696,doi: 10.6038/cjg2020N0409
Cenozoic tectono-thermal evolution features and influence factors of the Liyue basin, South China Sea
SHI XiaoBin1,2,3, WANG LiFang4,5, REN ZiQiang1,6, PEI JianXiang4,5, SHEN YongQiang1,6, SHI DeFeng4,5, LIU Kui1,6, ZHAO Peng1,6, YAN AnJü4,5
1. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; 2. Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China; 3. Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou), Guangzhou 510301, China; 4. Hainan Energy Ltd. of CNOOC, Haikou Hainan 570100, China; 5. Zhanjiang Branch of CNOOC Ltd., Zhanjiang Guangdong 524057, China; 6. University of Chinese Academy of Science, Beijing 100049, China
Abstract：To further understand the Cenozoic thermal regime of the Liyue Basin, based on crustal stretching factor analyses, we used a numerical model of coupled geothermal processes, lithosphere thinning and depositional processes to reconstruct the tectono-thermal evolutional histories of eight backbone profiles in the Liyue basin, and analyzed the thermal evolution features in the main structural units and their influence factors. The results show that, Liyue basin was greatly extended and thinned during the synrift phase, and the crustal stretching factors are generally larger than 1.8 in most regions of its sags; During the synrift phase, heat flow increased generally with time, and at the end of the synrift phase, seafloor heat flow were as high as about 70~80 mW·m-2, and heat flow in basement high regions was generally higher than heat flow in sag regions. During the postrift phase, due to deposition and thermal relaxation, heat flow decreased gradually to 65~70 mW·m-2 at present in the regions where reef bodies were not developed continuously, while in the SW and NW regions of the basin, heat flow becomes higher due to recent magmatic intrusion. Seafloor heat flow and thermal gradient in reef body developing areas are quite low, and even negative due to heat exchange between the upper part of reef bodies and the surrounding low temperature seawater. Further analyses suggest that, the thermal regime of the Liyue basin results mainly from intense lithospheric thinning, and other local influence factors such as recent magmatic intrusion, basement topography, sedimentation and seafloor topography. In addition, the thermal regime in the reef body developing area has been influenced greatly by the heat exchange between the upper part of reef bodies and the surrounding low temperature seawater. The oil and gas threshold depth and temperature are 2000~2500 mbsf and 90~110 ℃ in the central regions of the sags, respectively, which are slightly larger than the threshold depth and temperature in the surrounding basement rise area. In the reef body developing area, due to the heat exchange between overlying reef bodies and surrounding seawater, the thermal maturity of the underlying source rocks is much lower, and the oil and gas threshold depth are obviously larger than the threshold depth in the central regions of the sags.
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