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Volume 14 Issue 2
Jun 2003
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Journal of Earth Science  > 2003  >  14(2): 144-150.
Sheng He, Kaiko Alex, Middleton Mike, Chunqing Jiang. Assessment of Rock-Eval Tmax Data in Bambra-2 Well of Barrow Sub-basin, North West Shelf of Australia: A Case Study of Contaminated Rock-Eval Data. Journal of Earth Science, 2003, 14(2): 144-150.
Citation: Sheng He, Kaiko Alex, Middleton Mike, Chunqing Jiang. Assessment of Rock-Eval Tmax Data in Bambra-2 Well of Barrow Sub-basin, North West Shelf of Australia: A Case Study of Contaminated Rock-Eval Data. Journal of Earth Science, 2003, 14(2): 144-150.
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Assessment of Rock-Eval Tmax Data in Bambra-2 Well of Barrow Sub-basin, North West Shelf of Australia: A Case Study of Contaminated Rock-Eval Data

  • 1.

    Faculty of Earth Resources, China University of Geosciences, Wuhan 430074

  • 2.

    Department of Applied Geology, Curtin University of Technology, Perth, WA 6845, Australia

  • 3.

    Geological Survey of Canada, N W Calgary, Alberta, T2L 2A7, Canada

Funds:  This is supported by Geological Survey of Canada, Calgary
  • Received Date: 10 Feb 2003
  • Accepted Date: 28 Mar 2003
    Abstract

  • The contamination of cuttings and side wall core (SWC) samples in the Bambra 2 well by drilling mud additives and natural hydrocarbons may cause Rock Eval Tmax (℃) data to be suspect, and affect its utility in the assessment of thermal maturity. The Rock Eval results of 284 cuttings samples, 31 side wall core samples and conventional core samples from the Jurassic Cretaceous sedimentary sequences in the Bambra 2 well are presented in this paper. Significantly lower Tmax values from cuttings samples compared with Tmax values from conventional core samples and solvent extracted SWC samples, from the deeper and higher maturity interval, are thought to have been caused by contamination by diesel and other drilling mud additives. The cuttings samples in the Barrow Group of Cretaceous may be contaminated by natural hydrocarbons, resulting their Tmax values to be 2-10 ℃ lower than a regularly increased Tmax trend from core samples. This study indicates that more reliable Rock Eval Tmax data are obtained from the conventional core samples and solvent extracted SWC samples. This study also indicates that the Tmax values from some SWC samples were also affected by free hydrocarbons, due to the use of diesel as a mud additive as well.

     

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    • References(17)
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