塔里木盆地塔北隆起寒武系地层水化学特征、成因及矿物溶解-沉淀模拟

doi:10.11743/ogg20220116

Abstract

Abstract:

The chemical compositions and ion ratio coefficient of the Cambrian formation water taken from 14 wells in Yingmai and Yaha areas and Well Luntan 1 in the Tabei Uplift， Tarim Basin， are analyzed and applied to carry out hydrogeochemical simulation， with the geochemical characteristics， origin and evolution of formation water therein clarified. The results show that the Cambrian formation water in the study area is of CaCl₂ type， high in total dissolved solids （TDS）， and dominated by Na⁺+K⁺ and Cl^-. The concentration of Na⁺+K⁺ and Cl^- is well correlated with TDS of the formation water. Concentration of ions like Na⁺+K⁺， Ca²⁺， Mg²⁺， Cl^- and SO₄^2- tends to decrease first and then increase with the increase of burial depth， consistent with the trend of TDS change with burial depth. Vertically， two hydrochemical zones can be identified in the study area： an overflow-discharge concentration zone and a deep percolation concentration zone. Its sodium-chloride coefficient ranges from 0.39 to 0.55， averaging 0.51； de-sulfuric acid coefficient varies from 0.07 to 1.91 with an average value of 0.35. The results of mineral saturation index simulation by Phreeqc software suggest that saturation index of dolomite ranges from -3.43 to 1.95 with an average of -0.10， and 50.91 % of the dolomite is precipitated； the saturation index of gypsum ranges from -1.77 to 0.12 with an average of -0.80， and 94.64 % of the gypsum is dissolved； the saturation index of calcite ranges from -0.88 to 1.62 with an average of 0.55， and 18.18 % of the calcite is dissolved. A combination of calcite dolomitization and gypsum dissolution in the study area leads to enrichment of Ca²⁺ and deficit of Mg²⁺ in the current formation water. The Cambrian formation water low in metamorphic degree in the study area， can be attributed to seawater evaporation and concentration， ion adsorption and water-rock interactions.

Key words: geochemical characteristics, water-rock interaction, Phreeqc software, formation water, Cambrian, Tabei Uplift, Tarim Basin

CLC Number:

TE122.1

Yaqian Gui, Guangyou Zhu, Zhuang Ruan, Yinghui Cao, Zhenhuan Shen, Qiuhong Chang, Guoping Chen, Bingsong Yu. Geochemical features and origin of the Cambrian formation water in Tabei Uplift，Tarim Basin and its mineral dissolution-precipitation simulation[J]. Oil & Gas Geology, 2022, 43(1): 196-206.

Figures/Tables 12

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矿物	白云石	石膏	方解石
饱和指数	-3.43～1.95 -0.10（55）	-1.77～0.12 -0.80（55）	-0.88～1.62 0.55（55）
溶解率/%	43.64	94.64	18.18
平衡率/%	5.45	5.36	14.55
沉淀率/%	50.91	—	67.27

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Geochemical features and origin of the Cambrian formation water in Tabei Uplift，Tarim Basin and its mineral dissolution-precipitation simulation

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