Case Studies

 

OFFSHORE INDONESIA

 

200m of drilled intersection was profiled at an offshore wellsite by the GeoMinTM FTiR analysis of 38 cuttings samples for mineralogy and minimum TOC. The 38 samples were washed, dried, subsampled, ground to a powder and analysed in 6 hours.

 

Method

After washing and drying a representative subsample of approximately 5gm, which was ground with an agate mortar and pestle to a fine powder, a small portion of the sample was analysed using a Bruker Alpha benchtop FTIR spectrometer, producing a spectrum within approximately 30 seconds of analysis.

 

Results

 

  • A distinct break at 2350m in mineralogical composition from quartz and carbonate dominated, to clay dominated, determined the base of the reservoir to within a few metres and correlated to features observed in logs run in offset wells. 

 

  • The alkane content in samples provides a proxy minimum TOC and thermal maturity values indicating the deeper interval to be a rich source rock, mature for oil generation.

 

 

ONSHORE AUSTRALIA

 

700m of drilled intersection was profiled at an onshore unconventional asset well by the GeoMinTM FTIR analysis of 289 core micro samples for mineralogy and minimum TOC. A total of 289 samples were analysed over a 2 day period in the core store.

 

Method

 

A high speed masonry drill was used to take micro samples from slabbed core. A small portion of the sample is then analysed using a Bruker Alpha benchtop FTIR spectrometer, producing mineralogical and geochemical results within approximately 30 seconds of analysis.

 

Results

 

 

  • At 1320m there is a clear transition from mineralogy dominated by quartz and carbonate to one predominantly characterised by carbonate and clay. This transition marked the reservoir base to an accuracy of less than 2 metres. Log comparison confirmed GeoMinͭͫ

 

  • A rich source rock was indicated by the minimum total organic carbon values.

 

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