a State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China; b School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan, China; c PetroChina Key Laboratory of Carbonate Reservoir, Southwest Petroleum University, Chengdu 610500, Sichuan, China; d State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing210023, Jiangsu, China
Abstract Lower Cretaceous black shales in coastal southeastern China are of significance to the geological study of the Tethys and Pacific realms and to hydrocarbon exploration of southeastern China and East China Sea. However, the stratigraphic correlation, distribution patterns and hydrocarbon potential of the black shales have not been well constrained so far. In this study, the zircon U-Pb ages, organic petrologic and geochemical analyses were performed for representative outcrop sections in the region. Zircon U-Pb ages demonstrate that the Lower Cretaceous black shales in coastal southeastern China can be divided into two regional-scale sets. The first set was deposited during the early stage of the Early Cretaceous (K11, Berriasian-Hauterivian). The second set was deposited during the late stage of the Early Cretaceous (K12), and might extend to the Taiwan Strait. Detailed organic geochemical analyses including organic matter abundance, type and maturity of the Lower Cretaceous black shales demonstrate that the organic matter abundance of the sources reached medium to good quality by the hydrocarbon source rock standards, and the average TOC values and the chloroform bitumen “A” of the K11 black shales are higher. The type of organic matter is mainly type III, type II can also be found of the K12 black shales. The thermal maturity of most samples is high to overmature. A relatively comprehensive hydrocarbon resource evaluation indicates that favorable regions are in the northern Guangdong Province for the K11 and in the coastal region of Zhejiang Province and the western Fujian Province for the K12. Sedimentology studies on the Shipu section for the K11 black shales illuminated that the K12 black shales in coastal southeastern China were mainly deposited during transgressive periods. The relative sea level changes controlled the sequential development pattern of the K12 black shales.
Fund:This study was funded by the National Natural Science Foundation of China (Grant No. 41472099).
Corresponding Authors:* Corresponding author.
E-mail: Lower Cretaceous|Black shales, Hydrocarbon potential, development pattern, Southeastern China
Cite this article:
Guang Hu,Wenxuan Hu,Jian Cao et al. The distribution, hydrocarbon potential, and development of the Lower Cretaceous black shales in coastal southeastern China[J]. , 2017, 6(4): 333-351.
Guang Hu,Wenxuan Hu,Jian Cao et al. The distribution, hydrocarbon potential, and development of the Lower Cretaceous black shales in coastal southeastern China[J]. Journal of Palaeogeography, 2017, 6(4): 333-351.
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