羌塘盆地侏罗系钾盐成矿潜力及勘探方向

doi:10.12108/yxyqc.20260404

Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (4): 38-52.doi: 10.12108/yxyqc.20260404

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Metallogenic potential and exploration direction of Jurassic potash in Qiangtang Basin

ZHANG Jiezhi¹^,²(), ZHU Guangyou¹^,², JI Changjun³, LI Xi¹^,²(), LI Huan¹^,², WEN Chen¹^,², GAO Heting¹^,², ZHENG Kaihang¹^,²

¹ School of Geosciences, Yangtze University, Wuhan 430100, China
² Hubei Key Laboratory of Complex Shale Oil and Gas Geology and Development in Southern China, Wuhan 430100, China
³ Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Received:2026-02-28 Revised:2026-04-21 Online:2026-07-01 Published:2026-07-06
Contact: LI Xi E-mail:geozhangjiezhi@126.com;geolixi@126.com

Abstract

Abstract:

Based on comprehensive literature review, conditions and controlling factors of salt-forming, distribution patterns of potash deposits, and the coupling relationship between salt structures and hydrocarbon accumulation of Jurassic in Qiangtang Basin were systematically examined, and exploration deployment was discussed. The results show that: （1） The formation of Jurassic marine evaporites in Qiangtang Basin was primarily controlled by the coupling of material supply, arid climate, and restricted tectonic settings. Seawater influx and terrigenous input constituted the principal sources of salt-forming materials. Restricted to semi-restricted depositional environments associated with the evolution of the Tethyan tectonic domain, together with arid climate, provided favorable conditions for salt-forming, while tectonic movements related to Tethyan evolution governed the spatiotemporal distribution of salt deposits. (2) The distribution pattern of Jurassic potash in the study area follows the model of “tectono-sedimentary control-material evaporation and concentration-paleoclimate-driving”. Vertically, Jurassic Xiali Formation and Suowa Formation represent the most prospective potash-bearing stratigraphic intervals. Laterally, the most favorable areas for marine potash mineralization are located along the southern margin of North Qiangtang Depression. The large evaporite-platform facies belt in northwestern Anduo county, salt-spring concentration development zones within the basin, and the Bandaohu-Puruogangri basement uplift and its adjacent large sags are exploration targets for marine potash resource. （3） Salt structures and hydrocarbon resources in the study area exhibit multiple levels of interaction, including depositional paragenesis, sealing protection, reservoir modification, and structural control. Salt structures can not only provide migration pathways for oil and gas, but also form effective hydrocarbon traps. Distribution patterns of salt deposits exert a fundamental control on hydrocarbon accumulation within suprasalt, intrasalt, and subsalt petroleum systems. (4) Potash research in the study area can focus on the evolution of evaporite depositional systems and sediment sources, mechanisms controlling salt deposits preservation under late stage tectonic modification, and promote research of “integrated exploration for hydrocarbons and potash resources”.

Key words: potash, salt structure, integrated exploration for hydrocarbon and potash resources, evaporites, depositional paragenesis, mineralization potential, resource investigation, Jurassic, Qiangtang Basin

CLC Number:

TE121.3

ZHANG Jiezhi, ZHU Guangyou, JI Changjun, LI Xi, LI Huan, WEN Chen, GAO Heting, ZHENG Kaihang. Metallogenic potential and exploration direction of Jurassic potash in Qiangtang Basin[J].Lithologic Reservoirs, 2026, 38(4): 38-52.

Figures/Tables 9

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地层			北羌塘			南羌塘
系	统	组	岩性简述	厚度/m	构造-沉积层序	组	岩性简述	厚度/m	构造-沉积层序
侏罗系	上统	索瓦组	泥晶灰岩、泥灰岩、介壳灰岩、泥岩夹石膏	284~1 228	海相沉积层系	索瓦组	深灰色泥晶灰岩、泥灰岩、灰绿色泥岩夹粉—细砂岩	1 677	海相沉积层系
	中统	夏里组	砂泥岩、泥灰岩、泥云岩、夹石膏	214~679	海相沉积层系	夏里组	深灰黑色泥岩、粉砂质泥岩，夹中—细砂岩条带	842	海相沉积层系
	中统	布曲组	泥晶灰岩、泥灰岩、介壳灰岩夹泥岩和石膏层	125~356	海相沉积层系	布曲组	灰黑色泥晶灰岩、泥灰岩、泥岩夹介壳、砂屑鲕粒灰岩	1 085	海相沉积层系
	下统	雀莫错组	砾岩、砂砾岩、砂岩夹灰黑色泥岩、介壳灰岩、膏岩层	499~931	海相沉积层系	色哇组	泥晶灰岩、粉砂质泥岩、粉砂质泥岩夹细砂岩、钙质页岩夹少量粉砂岩	1 158	海相沉积层系
	下统	雀莫错组	砾岩、砂砾岩、砂岩夹灰黑色泥岩、介壳灰岩、膏岩层	499~931	海相沉积层系	曲色组	灰黑色钙质页岩、泥页岩夹粉砂质泥岩、泥灰岩、粉砂岩	1 537	海相沉积层系

Metallogenic potential and exploration direction of Jurassic potash in Qiangtang Basin

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