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Prelim inary Study on the Concentrations of Gold and Other Ore Elements in Crude Oil and Oil-Field Water of the Jiyang Depression

HUA Ren-min1, YANG Shen-biao2, LI Bao-li2, DONG Dong2, ZHANG Shou-peng2 CHEN Jian-hua2, LI Zai-duo2, QIU Li-wen1, CAO Hu-1an1   

  1. 1. Department of Earth Sciences, Nanjing University, Nanjing 210093; 2. Institute of Geologic Science, Shengli Petroleum Bureau, Dongying 257000
  • Received:2001-09-20 Revised:2001-09-20 Online:2001-09-20 Published:2001-09-20

Abstract: 49 crude oil samples from different oil fields of the Jiyang Depression were collected and analyzed for their gold and silver concentrations. Result shows that they contain relatively high Au concentrations than those from most other oi1 basins in China Except the highest value of 220.3×10^-9 the average Au concentration of 48 oil samples is 3.60×10^-9. Heavy oil contains higher Au concentrations than light oil. Most gold-rich samples are from the reservoirs in upper Tertiary sandstone and Archean gneiss, of which the latter is the most important source rock for well-known gold mining district of East Shandong peninsula, and the former is the direct erosive product of the latter. Further study reveals that gold mostly occurs in the bituminite and colloidal components of the crude oil. These components contain more S, N , O , Cl and other atoms, which may cause stable gold-bearing complexes in crude oil. Concentrations of gold and some other ore dements in oil, field water samples from the Jiyang Depression aye also determined. Relatively high gold concentration and certain correlation between gold and other ore elements, i.e. As, Hg and Pb, are revealed. The partitioning relationship of gold in rock, oil and water is unknown, whereas this preliminary study shows that oil-field water might bring out some gold from oil in the water-oil separation process.