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Geochemical Characteristics of the Oils in the Kongdian Formation in the Southern Slope of the Dongying Sag and Their Source Rocks

WANG Jian-wei1, SONG Guo-qi2, SONG Shu-jun1,ZHAO Mi-fu3, GAO Xia4   

  1. 1.Xianhe Production Factory, Shengli Oilfield Branch Company, SINOPEC, Dongying, Shandong 257068, China;2.Shengli Oilfield Branch Company, SINOPEC, Dongying, Shandong 257068, China;3.Dongxin Production Factory, Shengli Oilfield Branch Company, SINOPEC, Dongying, Shandong 257068, China;4.Geophysical Research Institute, Shengli Oilfield Branch Company, SINOPEC, Dongying, Shandong 257068 China
  • Received:2007-04-19 Revised:1900-01-01 Online:2008-01-26 Published:2008-01-26
  • Contact: WANG Jian-wei

Abstract: Based on comprehensive analysis of the biomarkers such as isoprenoid paraffin, steranes, terpenoid and carbon isotope composition of oil samples from the Kongdian Formation in the southern slope of the Dongying sag, the typical geochemical characteristics of oils of the Kongdian Formation are recognized. The oils from the Kongdian Formation are featured by steranes composed mainly of regular steranes with low isomerasation, by C29 regular steranes enrichment and high content of tricyclic terpenoid, by ∑tricyclic terpenoid /∑terpenoid ratios ranging from 0.15 to 0.53 and by δ13Ｃ of less than -29‰. Because no genetic links to the three known types of source rocks have been found for the oils from the Kongdian Formation, there must be a set of undiscovered source rocks in the studying area. Judged from the typical biomarkers of the oils, it is concluded that the undiscovered source rocks should be in the deep zone of the Eogene rocks and contain high content of humus and low content of clay.

Key words: oils from the Kongdian Formation, geochemical characteristics, Dongying sag, ramp

CLC Number: 

  • P618.13
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