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首页> 外文期刊>Marine and Petroleum Geology >Mesozoic-Cenozoic denudation and thermal history in the Central Uplift of the South Yellow Sea basin and the implications for hydrocarbon systems: Constraints from the CSDP-2 borehole
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Mesozoic-Cenozoic denudation and thermal history in the Central Uplift of the South Yellow Sea basin and the implications for hydrocarbon systems: Constraints from the CSDP-2 borehole

机译：南黄海盆地中央隆起的中生代 - 新生代剥夺和热历史及对烃系统的影响：CSDP-2钻孔的约束

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摘要

This study focuses on the Mesozoic-Cenozoic tectono-thermal events in the Central Uplift of the South Yellow Sea Basin (SYSB) based on the CSDP-2 borehole. CSDP-2 is the first borehole to penetrate the integrated Paleozoic-Mesozoic sedimentary strata and recovered approximately 2736 m of core. The drilling results confirm a significant stratigraphic hiatus, i.e., Indosinian unconformity, between the Neogene-Quaternary and the underlying Lower Triassic. The eroded thickness estimated from sonic log and vitrinite reflectance data range from similar to 1200 to 1400 m. Multiple paleo-thermometer data from the CSDP-2 cores, including vitrinite reflectance, apatite/zircon fission-track (AFT/ZFT) and fluid inclusions, were used to reconstruct the Mesozoic-Cenozoic thermal history in the study area. There was a continuous heating process during the early Mesozoic. The peak paleo-temperature may have reached up to 160 degrees C (base Permian) during the Late Jurassic, with the highest paleo-geothermal gradient of approximately 58.8 degrees C.km(-1). The tectono-thermal evolution was dominated by the Mesozoic intracontinental collision between the Yangtze Craton and the Sino-Korean platform. The heating process was mainly caused by rapid burial on the passive continental margin and igneous activities. The paleo-temperature significantly decreased following the Late Jurassic. Two rapid cooling processes ca. 100-65 Ma and ca. 35 Ma are suggested by the AFT modeling results. Cooling history indicates that the tectonic uplift and denudation likely occurred from the Early Cretaceous to the Miocene. The reconstruction results of thermal evolution confirm that the Mesozoic-Paleozoic source rocks are mature or even highly mature, and hydrocarbon generation, migration and charge undoubtedly occurred in the Central Uplift, showing substantial hydrocarbon potential. Moreover, the reconstruction of the tectono-thermal history provides important constraints for regional tectonic studies.
机译：本研究重点是基于CSDP-2钻孔的南黄海盆地（SYSB）中央隆起的中生代 - 新生代构造 - 热事件。 CSDP-2是第一个穿透整合古生代 - 中生代沉积地层的钻孔，并回收约2736米的核心。钻井结果证实了Neogene-armateNary和潜在的下三叠系之间的重要地层中断，即Indosinian无关。从Sonic Log和Vitriinite反射率数据估计的腐蚀厚度从类似于1200到1400米。来自CSDP-2核心的多个古温度计数据，包括Vitriinite反射率，磷灰石/锆石裂变轨道（AFT / ZFT）和流体夹杂物，用于重建研究区域中的中生代新生代热历史。早期中生代期间存在连续加热过程。在晚期侏罗纪期间，峰古温度可能已达到160摄氏度（基础二叠岩），最高古地热梯度约为58.8摄氏度C.km（-1）。 Tectono-armative演进是由长江克拉顿和中韩平台之间的中生代内部碰撞的主导。加热过程主要是由无源大陆边缘和火火活动的快速埋葬引起的。侏罗纪晚期古温度显着下降。两个快速冷却过程CA。 100-65 ma和ca. AFT建模结果建议35 mA。冷却历史表明构造隆起和剥落可能发生从中茂的早期白垩纪。热演化的重建结果证实，中生代 - 古生代源岩是成熟的甚至高度成熟，并且碳氢化合物产生，迁移和电荷无疑发生在中央隆起中，显示出大量的烃潜力。此外，构造 - 热历史的重建为区域构造研究提供了重要的限制。

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