Enrichment conditions and metallogenic model of potassium and lithium resources in the Lower–Middle Triassic,northeastern Sichuan Basin,SW China  

作　　者：SU Kelu ZHONG Jiaai WANG Wei SHI Wenbin CHEN Zuqing LI Yuping FAN Zhiwei WANG Jianbo LIU Yong PAN Bei LIU Zhicheng JIANG Yanxia LIANG Zirui ZHANG Yuying WANG Fuming 

机构地区：[1]Sinopec Exploration Company,Chengdu 610041,China [2]The 2nd Geological Brigade of Sichuan,Chengdu 610081,China [3]Sichuan Institute of Land Science and Technology,Chengdu 610045,China

出　　处：《Petroleum Exploration and Development》2025年第1期272-284,共13页石油勘探与开发(英文版)

基　　金：Supported by the National Research and Development Program(2017YFC0602804);Geological Bureau Program of Sichuan Province(SCDZ-KJXM202403).

摘　　要：Wells CXD1 and CX2 have uncovered high-concentration potassium-and lithium-containing brines and substantial layers of halite-type polyhalite potash deposits within the 4th and 5th members of the Triassic Jialingjiang Formation and the 1st Member of Leikoupo Formation(Jia 4 Member,Jia 5 Member,and Lei 1 Member)in the Puguang area,Sichuan Basin.These discoveries mark significant breakthroughs in the exploration of deep marine potassium and lithium resources within the Sichuan Basin.Utilizing the concept of“gas-potassium-lithium integrated exploration”and incorporating drilling,logging,seismic,and geochemical data,we have investigated the geological and enrichment conditions,as well as the metallogenic model of potassium-rich and lithium-rich brines and halite-type polyhalite.First,the sedimentary systems of gypsum-dolomite flats,salt lakes and evaporated flats were developed in Jia 4 Member,Jia 5 Member,and the 1st member of Leikoupo Formation(Lei 1 Member)in northeastern Sichuan Basin,forming three large-scale salt-gathering and potassium formation centers in Puguang,Tongnanba and Yuanba,and developing reservoirs with potassium-rich and lithium-rich brines,which are favorable for the deposition of potassium and lithium resources in both solid or liquid phases.Second,the soluble halite-type polyhalite has a large thickness and wide distribution,and the reservoir brine has a high content of K+and Li+.A solid-liquid superimposed“three-story structure”(with the lower thin-layer of brine reservoir in lower part of Jia 4 Member and Jia 5 Member,middle layer of halite-type polyhalite potash depositS,upper layer of potassium-rich and lithium-rich brine reservoir in Lei 1 Member)is formed.Third,the ternary enrichment and mineralization patterns for potassium and lithium resources were determined.Vertical superposition of polyhalite and green bean rocks is the mineral material basis of potassium-lithium resources featuring“dual-source replenishment and proximal-source release”,with primary seawater and gypsum d

关 键 词：potassium-lithium resources halite-type polyhalite potassium-rich and lithium-rich brine enrichment mechanism Triassic Jialingjiang Formation Leikoupo Formation Puguang area Sichuan Basin 

分 类 号：P61[天文地球—矿床学]