Sedimentary characteristics and paleo-environment restoration of the first member of Qingshankou Formation in Qian'an area, Changling sag, Songliao Basin: A case study of Jiyeyou 1 Well
Author:
Affiliation:

Clc Number:

P618.13

Fund Project:

  • Article
  • |
  • Figures
  • |
  • Metrics
  • |
  • Reference
  • |
  • Related
  • |
  • Cited by
  • |
  • Materials
  • |
  • Comments
    Abstract:

    The first member of Upper Cretaceous Qingshankou Formation (K2qn1) in Songliao Basin has considerable shale oil resource potential because of the wide development of dark mudstone and high residual hydrocarbons. The paleo-sedimentary environment directly controls the dark mudstone distribution, organic matter development, and residual hydrocarbon content. Therefore, analyzing the sedimentary features and restoring the paleo-environment of K2qn1 are of great significance for revealing the regularity of shale oil enrichment. Based on the core observation and logging data of well Jishanyou 1 in Qian'an area of Changling Sag, the authors analyzed the sedimentary characteristics of K2qn1. According to the element data obtained by natural gamma ray spectrometry logging and lithologic scanning logging, the evolution of the paleo-environment of K2qn1 was restored by using suitable parameters. Furthermore, the correlation of paleo-environment parameters and residual hydrocarbon content in mudstone shale was also studied. The results show that the dark mudstone of K2qn1 in the study area was developed in the outer Delta front to shallow lake-semi-deep lake sedimentary system. The palaeo-environment of K2qn1 underwent a change of water depth from shallow to deep, climate from semi-humid to humid, salinity from fresh to brackish, reduction conditions from weak to strong, and sedimentary hydrodynamics from moderate to weak. There is an obvious interface of sedimentary environment within K2qn1. The content of residual hydrocarbon in the mudstone is mainly controlled by paleo-climate and paleo-reduction conditions. The oil-bearing organic matter was formed in a wet and reducing environment, with strong oil-generating capability and high content of residual hydrocarbon.

    Reference
    Related
    Cited by
Get Citation

BAI Jing, XU Xingyou, CHEN Shan, LIU Weibin, LIU Chang, ZHANG Changsheng. Sedimentary characteristics and paleo-environment restoration of the first member of Qingshankou Formation in Qian'an area, Changling sag, Songliao Basin: A case study of Jiyeyou 1 Well[J]. Geology in China, 2020, 47(1): 220-235(in Chinese with English abstract).

Copy
Share
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
History
  • Received:August 17,2018
  • Revised:January 09,2019
  • Adopted:
  • Online: March 06,2020
  • Published: