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Volume 46 Issue 1
Jan.  2024
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(1): 136-145
SHI Defeng, ZHU Youhua. Eocene sporopollen assemblage from Ramree Island, Myanmar and its palaeoenvironment significance[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 136-145. doi: 10.11781/sysydz202401136
Citation: SHI Defeng, ZHU Youhua. Eocene sporopollen assemblage from Ramree Island, Myanmar and its palaeoenvironment significance[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 136-145. doi: 10.11781/sysydz202401136
shu

Eocene sporopollen assemblage from Ramree Island, Myanmar and its palaeoenvironment significance

doi: 10.11781/sysydz202401136
  • 1.

    Hainan Branch, CNOOC (China) Limited, Haikou, Hainan 570312, China

  • 2.

    Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China

  • Received Date: 2023-04-20
  • Rev Recd Date: 2023-12-01
  • Publish Date: 2024-01-28
    Abstract
  • In order to support the oil and gas exploration in China-Burma cooperation block M and determine the age and sedimentary environment of the oil and gas bearing strata in Ramree Island of this block, a total of 10 source rock samples were collected for sporopollen analysis from the interval 2 562-2 844 m of well R-3 in Ramree Island, Burma. Abundant sporopollen fossils were found in each sample through observation, and 135 species attributable to 85 genera or undetermined species were identified. The sporopollen fossils in this interval are rich in Momipites and Quercoidites, with Sabalpollenites areolatus, a common molecule in Eocene, appearing intermittently, and characterized by Schizaeoisporites eocenicus. Based on the distribution patterns of sporopollen characteristic molecules and dominant genera and species, one sporepollen assemblage was recognized, namely Schizaeoisporites eocenicus-Quercoidites-Momipites-Sabalpollenites areolatus. By comparing the distribution ages of foraminifers and coccolithus nannofossils in the same interval, it was inferred that the age of sporepollen assemblage was the middle to late Eocene. According to the characteristics of the sporepollen assemblage, the statistical results of Paleogene to Neogene sporopollen sequence data in China's oil and gas regions, three models for the classification of sporopollen plant types, temperature zones and dry and humid zones established after systematic research, and distribution characteristics of other palynological fossils, we interpret that the study area was offshore land paleoenvironment with subtropical and warm temperate humid paleoclimate in the middle to late Eocene.

     

    • All authors disclose no relevant conflict of interests.
    SHI Defeng wrote parts 1, 4 and 5 as well as the English abstract, and completed the final proofreading. ZHU Youhua completed the analysis of spore and pollen, observation and identification, data statistics, map drawing, writing parts 2 and 3 and the Chinese abstract. Both authors have read the last version of paper and consented for submission.
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