J4 ›› 2010, Vol. 40 ›› Issue (1): 9-14.

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The Organic Geochemical Characteristics of Source Rock in Volcanic Rocks During Yiliekede Formation of Early Cretaceous in Mohe Basin

GAO Fu-hong1, GAO Hong-mei2, FAN Fu3   

  1. 1.College of Earth Sciences, Jilin University, Changchun 130061|China;2.Faculty of Natural Resource and Information Technology, China University of Petroleum, Beijing 102249, China;3.School of Ocean and Earth Science, Tongji University, Shanghai 200092, China
  • Received:2009-09-14 Online:2010-01-26 Published:2010-01-26

Abstract:

The source rocks discovered first in Yiliekede Formation during the Early Cretaceous in Mohe basin are analysed by rock pyrolysis, chloroform bitumen extration, gas chromatography and gas chromatography-mass spectrogram analyse. The results indicate that source rocks are composed of coal, oil shale and shale, TOC content is more than 10%, organic materials take type Ⅱ2 kerogen mainly, the distribution of Ro ranges from 0.56% to 0.59% which belongs to low mature stage. The source rock has been of high grade. The organic materials of source rock are mainly from terrigenous plants combined with abundant aquatic organisms input, which reflects the mixed-source of organics input  of  terrigenous  plants and hydrophilous alga. During Yiliekede Formation, the salinity and reduction of water change a lot so that salt water lake alternates with fresh water lake and it presents obvious chemistry stratify, which contributes to the retention and invert of organic.

Key words: Yiliekede Formation, source rock, organic geochemical characteristics, Mohe basin, volcanic rocks

CLC Number: 

  • P59
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