Abstract
Formation water can evaluate the petroleum preservation conditions and thus can be used to identify hydrocarbon reservoirs. This paper analysed the formation water geochemistry and its relationship with the petroleum distribution in Yanchang Formation of Wuqi Oilfield, Ordos Basin. The formation water shows property of weak acid and high salinity. The ion concentrations are dominated by C1-, Na+, K+ and Ca2+. The CaCl2-type water is predominant. The chemical properties here indicate good sealing conditions for petroleum preservation. The high TDS value and the low (Na+ /C1-), (100 × SO42-/Cl- and ((CO32- + HCO3-/CA2+) ratios indicate better sealing condition for petroleum preservation. The formation water chemical geochemistry can provide predictions of oil-rich reservoirs. [Received: January 24, 2022, Accepted: June 04, 2022]
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