Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1332-1341.doi: 10.13278/j.cnki.jjuese.201505107

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Hydrocarbon Evaluation of Carboniferous-Permian Source Rocks in Northeast Jizhong Depression

Qian Zheng1, Zhang Songhang2, Liang Hongbin1, Tang Shuheng2, Yang Ning2   

  1. 1. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    2. School of Energy and Resources, China University of Geosciences, Beijing 100083, China
  • Received:2014-10-12 Published:2015-09-26

Abstract:

Carboniferous-Permian coal measures strata possess the conditions of a good source-reservoir-seal assemblage and thus a huge exploration potential of the self-generation and self-storage coal gas in the Upper Paleozoic strata in the northeast of Jizhong depression. However, the reality demonstrates only a few successful wells but a lot of empty ones in the historic exploration. We evaluated the hydrocarbon potential of source rock based on the pyrolysis data analysis and thermal simulation experiment to reduce the exploration risk in this strata. The results show that the contents of TOC (10% and 40%) is the effective demarcation of dark mudstone, carbon mudstone and coal. The source rock of Carboniferous-Permian coal measures strata are of mainly type III kerogen, and belong to poor-medium oil source rock and good gas source rock. Affected by magmatic thermal metamorphism and plutonic metamorphism respectively, the maturity of the three areas i.e. Wuqing depression, Su4-Su8-Su23-Wengu4, and Ge8-Dacan1 are relatively high. As hydrocarbon generation centers, their hydrocarbon generation amount is calculated for 4 trillion cubic square meters of gas.

Key words: Jizhong depression, source rock, coal gas, thermal simulation, hydrocarbon generation potential

CLC Number: 

  • P618.13

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