Geochemical Characteristics of Deep Formation Brine, Leikoupo Formation of Middle Triassic Sichuan Province

Huang Sijing; Zeng Yunfu

A kind of deep formation brine, very rich in potassium, boron and bromine, with reservoir depth of4 300 m approximately, was found in the strata of Leikoupo Formation, Middle Triassic, SichuanProvince. The content of K⁺in this brine is about 50 g /L, Na⁺more than 92 g /L, B ₂ O₃ more than 12 g /L, Br ^- more than 2. 36 g /L, and I⁺about 0. 030 g /L. It has very high value economically and scientifical-ly. The solid phase from evaporating of this brine at 25 ℃ includes KB ₅ O₈ · 4H ₂ O, K ₂ B₄ O₇ · 3H₂ O, MgCl ₂· 6H ₂ O and KMgCl ₃ · 6H ₂ O. Theδ¹⁸O of this brine is from 2. 2 ‰ to 2. 8 ‰ ( SNOW),δ D from - 38 ‰ to- 53 ‰ ( SMOW),δ³⁴S 15. 6 ‰, andδ¹³B from 13. 5 ‰ to 15. 1 ‰. Based on these geochemical characters,specially isotope of boron, it is suggested that composition of the brine consists of marine brines frommiddle Triassic, nonmarine brines from Upper Triassic and the dissolution of marine evaporites in burialstrata of Middle Triassic.

Geochemical Characteristics of Deep Formation Brine, Leikoupo Formation of Middle Triassic Sichuan Province

Chengdu Institute of Technolgy,Chengdu,Sichuan 610059

Received Date: 1996-04-03

Publish Date: 1997-09-10

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Abstract: A kind of deep formation brine, very rich in potassium, boron and bromine, with reservoir depth of4 300 m approximately, was found in the strata of Leikoupo Formation, Middle Triassic, SichuanProvince. The content of K⁺in this brine is about 50 g /L, Na⁺more than 92 g /L, B ₂ O₃ more than 12 g /L, Br ^- more than 2. 36 g /L, and I⁺about 0. 030 g /L. It has very high value economically and scientifical-ly. The solid phase from evaporating of this brine at 25 ℃ includes KB ₅ O₈ · 4H ₂ O, K ₂ B₄ O₇ · 3H₂ O, MgCl ₂· 6H ₂ O and KMgCl ₃ · 6H ₂ O. Theδ¹⁸O of this brine is from 2. 2 ‰ to 2. 8 ‰ ( SNOW),δ D from - 38 ‰ to- 53 ‰ ( SMOW),δ³⁴S 15. 6 ‰, andδ¹³B from 13. 5 ‰ to 15. 1 ‰. Based on these geochemical characters,specially isotope of boron, it is suggested that composition of the brine consists of marine brines frommiddle Triassic, nonmarine brines from Upper Triassic and the dissolution of marine evaporites in burialstrata of Middle Triassic.

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Geochemical Characteristics of Deep Formation Brine, Leikoupo Formation of Middle Triassic Sichuan Province

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