| 柴达木西部南翼山构造富钾深层卤水矿的控制因素及水化学特征 |
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| 关键词:Nanyishan anticlinal structure in western Qaidam Basin potassium-rich deep brine control factors hydrochemical characteristics |
| 基金项目:中国地质调查局地质调查项目(编号: 1212010011806; 1212011085521; 1212011220789) |
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| Control Factors and Water Chemical Characteristics of Potassium-rich Deep Brine in Nanyishan Structure of Western Qaidam Basin |
| The deep brine in Nanyishan area in the western part of the Qaidam Basin is a liquid deposit with extremely high economic value, characterized by enrichment of potassium, boron, lithium and bromine. Previous workers considered that the lithologic character of the strata in Nanyishan anticlinal structural area controls the distribution of deep potassium-rich brine. The study conducted by the authors reveal that the brine in this area is controlled by fault fissures developed in the anticlinal structure, with the depth range from Pliocene Shangyoushashan Formation to Oligocene Lower Ganchaigou Formation. With the formation mechanism and hydrochemical characteristics of the potassium-rich deep brine in E3g–N1y strata of Nanyishan anticlinal structure as the emphatic study objects and on the basis of field observation and sampling as well as indoor analysis, the authors made an integrated analysis of geological, hydrological and physical data provided by related geological and petroleum departments as well as the newest brine bed perforation data of old drill holes provided by Qinghai Oilfield Company in combination with sedimentary environment and geological structure of the brine-storage reservoir as well as hydrogeological and geochemical characteristics of potassium-rich deep brine. The results show that Nanyishan anticlinal structure in the western part of the Qaidam Basin experienced the evolution of deep lacustrine facies-semi-deep lacustrine facies-shallow lacustrine facies-tidal flat facies from Oligocene to Pliocene. The sedimentary environment decided the water character and water quality of the primary deep brine. Simultaneously with the formation of Nanyishan anticlinal structure, a series of longitudinal, transverse and bedding faults as well as corresponding structural cracks (fissures) were formed to serve as water-storage space for potassium-rich deep brine. Large quantities of chemical analytical data demonstrate that the deep brine in Annyishan anticlinal structure resulted from sedimentary metamorphism in a highly-closed reduction environment. |
| LI Hong-pu,ZHENG Mian-ping,HOU Xian-hua,YAN Li-juan.2015.Control Factors and Water Chemical Characteristics of Potassium-rich Deep Brine in Nanyishan Structure of Western Qaidam Basin[J].Acta Geoscientica Sinica,36(1):41-50. |
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