Wang Furong, He Sheng, Zheng Youheng, Hou Yuguang, Wu Shiqiang. Mineral composition and brittleness characteristics of the inter-salt shale oil reservoirs in the Qianjiang Formation, Qianjiang Sag[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(2): 211-218. doi: 10.11781/sysydz201602211
Citation: Wang Furong, He Sheng, Zheng Youheng, Hou Yuguang, Wu Shiqiang. Mineral composition and brittleness characteristics of the inter-salt shale oil reservoirs in the Qianjiang Formation, Qianjiang Sag[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(2): 211-218. doi: 10.11781/sysydz201602211

Mineral composition and brittleness characteristics of the inter-salt shale oil reservoirs in the Qianjiang Formation, Qianjiang Sag

doi: 10.11781/sysydz201602211
  • Received Date: 2015-06-12
  • Rev Recd Date: 2016-01-26
  • Publish Date: 2016-03-28
  • Core samples of shales from the second (Eq2), third (Eq3) and fourth (Eq4) members of the Qianjiang Formation in the Qianjiang Sag were analyzed using X-ray diffraction (XRD) analyses to determin their mineral composition, brittleness and geochemical characteristics. The results showed that the shales from different formations have different mineral compositions and geochemical characteristics. The shales in Eq2 have sapropelic organic matter. The TOC content averages 1.38%. The Ro value ranges from 0.26%-0.5%, indicating an immature to low-maturity thermal evolution stage. Evaporite rocks are in high content. The shales in Eq3 have sapropelic and humic-sapropelic organic matter. The TOC content averages 2.53%. The Ro value ranges 0.5%-0.88%, indicating a low to medium-maturity thermal evolution stage. Quartz and clay minerals are in high content. The shales in Eq4 have sapropelic and humic-sapropelic organic matter. The TOC content averages 0.69%. The Ro value ranges 0.55%-1.3%, indicating a medium-maturity to mature thermal evolution stage. Carbonate minerals are in high content. The inter-salt shales in the Qianjiang Formation are characterized by "low clay content, low quartz content, high carbonate content, and low brittle mineral content" compared to those in the USA and other regions in China. The shales in Eq3 have higher brittle mineral content (average 56%) and higher brittleness index (average 75.3%), which show excellent exploration potential.

     

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