XIAO Guolin, WANG Mingjian, YANG Changqing, PANG Yumao. Numerical simulation of Mesozoic hydrocarbon generation, migration and accumulation in the southern East China Sea[J]. Marine Geology & Quaternary Geology, 2019, 39(6): 138-149. DOI: 10.16562/j.cnki.0256-1492.2019070304
Citation: XIAO Guolin, WANG Mingjian, YANG Changqing, PANG Yumao. Numerical simulation of Mesozoic hydrocarbon generation, migration and accumulation in the southern East China Sea[J]. Marine Geology & Quaternary Geology, 2019, 39(6): 138-149. DOI: 10.16562/j.cnki.0256-1492.2019070304
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Numerical simulation of Mesozoic hydrocarbon generation, migration and accumulation in the southern East China Sea

  • 1.

    Qingdao Institute of Marine Geology, CGS, Qingdao 266071,China

  • 2.

    Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237,China

  • 3.

    College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590,China

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  • Received Date: July 02, 2019
  • Revised Date: August 03, 2019
  • Available Online: October 23, 2019
    Graphical Abstract
    • Abstract
  • Comprehensive analysis and numerical simulation are conducted for hydrocarbon generation, expulsion, migration and accumulation in the southern East China Sea. Results show that the dark mudstones in the T3-J2 and K12-K2 have similar hydrocarbon generation potential roughly in an amount of 1.2×1011 t. The dark mudstone developed in J1-2 has been proved a mature and effective source rock by oil and source rock correlation, whereas the dark mudstone deposited in the K12-K2 is also a potential source rock of the study area. The hydrocarbons generated by T3-J2 source rocks started migration and accumulation in Early Cretaceous and peaked in Late Cretaceous, while the hydrocarbons generated by K12-K2 source rocks started moving in Late Cretaceous and reached its peak in Late Paleocene. Traps formed by the Yandang movement, the Oujiang movement and the movements before them were favorable for capturing the hydrocarbons coming from the Jurassic and Cretaceous source rocks. Faults and unconformities formed by the Mesozoic-Cenozoic multi-stage tectonic movements provided prevailed paths for hydrocarbon to move and accumulate in the structural traps in the fault-zone in preferential position. The hydrocarbon accumulation in the Cretaceous is estimated three times more than that in the Jurassic. The structural type and the joint structural-unconformity type of accumulations near the unconformity surface between J2 and K1 is two important types of hydrocarbon accumulation in the Mesozoic. Two accumulation models i.e. the "near-source accumulation" and the "far-source accumulation", are discovered. There are three types of hydrocarbon accumulations: the accumulation synchronously generated, stored and sealed; the accumulation early generated, later stored and sealed, and the accumulations formed by later generated hydrocarbon which stored in old deposits and covered by younger sediments.
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