Oil & Gas Geology ›› 1996, Vol. 17 ›› Issue (4): 308-312.doi: 10.11743/ogg19960409

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CHARACTERISTICS AND ORIGIN OF TAR MATS IN YAHA OIL-GAS FIELDS,TARIM BASIN:OCCURRENCE AND MARCROSCOPIC COMPOSITIONAL FEATURES

Zhang Min, Zhang Jun, Mei Bowen   

  1. Jianghan Petroleum Institute, Jingsha, Hubei
  • Received:1996-03-13 Revised:1996-09-03 Online:1996-12-25 Published:2012-01-16

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Abstract:

Two tar mats were firstly discovered and determined accurately in Paleogene nonmarineoil-gas pools in Yaha Oilfields,Tarim Basin, by thin layer chromatography-flame ionizationdetector (TLC-FID) and Rock Eval. The relative content of asphaltene in gross compositionof tar mat extracts is more than 30%,but the content in corresponding oil leg is less than20%. In the profile geochemical description of oil reservoirs, sudden changes in asphaltenecontents between the tar mats and oil layers could be seen. This is an important marker todetermine tar mats.