Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1635-1644.doi: 10.13278/j.cnki.jjuese.20170140

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Organic Matter Evaluation of Source Rocks in Middle Jurassic Northern Mohe Basin

Yang Xiaoping1, Zhang Wenlong2, Wang Yan1, Tan Hongyan1   

  1. 1. Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China;
    2. Qiqihar Branch, Heilongjiang Research Institute of Geological Survey, Harbin 150036, China
  • Received:2017-05-16 Online:2018-11-26 Published:2018-11-26
  • Supported by:
    Supported by Geological Survey Project of China Geological Survey(GZHL20120302, DD20160345-17,DD20160048-01)

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Abstract: Based on the investigation of petroleum geology in the northern Mohe basin, we determined the distribution range of hydrocarbon source rocks (including carbonaceous mudstone) closely related to the formation of oil and gas, which provide a target area for the next step to find oil and gas resources. The results show that the source rocks in Mohe basin are black mudstones with total organic carbon w(TOC) of 0.20%-30.30%. We delineated 26 source rock areas of 134.69 km2. The pyrolysis Tmax (℃) average value of hydrocarbon source rocks is 442℃, indicating that the evolution of source rock is in the mature-over mature stage. Through the analysis of the hydrocarbon geological conditions in the northwest of Mohe basin, the Middle Jurassic sedimentary rocks provide a good space for oil and gas storage; the Mesozoic magmatic activities and ductile shearing provide a suitable temperature for oil and gas formation; the extensional faults, fissures and cataclastic structures provide migration channels and storage space for oil and gas migration and storage.

Key words: Mohe basin, Middle Jurassic, source rock evaluation, organic matter

CLC Number: 

  • P618.13
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