早始新世温室气候与海侵作用对库车坳陷库姆格列木群含盐层系沉积的协同控制作用  

Collaborative controls of the Early-Eocene greenhouse climates and transgression on deposition of salt-bearing sequence of Kumugeliemu Group in Kuqa Depression

作　　者：张锡婷 范坤宇 郭佩 李鹏真 苗如霖 邓宾[2,4] ZHANG Xiting;FAN Kunyu;GUO Pei;LI Pengzhen;MIAO Rulin;DENG Bin(Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources,Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Research Institute of Exploration&Development PetroChina Tarim Oilfield Company,Xinjiang Korla 652801,China;School of Energy,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]自然资源部深时地理环境重建与应用重点实验室,成都理工大学沉积地质研究院,四川成都610059 [2]油气藏地质及开发工程国家重点实验室,成都理工大学,四川成都610059 [3]中国石油塔里木油田公司勘探开发研究院,新疆库尔勒652801 [4]成都理工大学能源学院,四川成都610059

出　　处：《古地理学报》2024年第4期926-940,共15页Journal of Palaeogeography：Chinese Edition

基　　金：国家自然科学基金项目(编号:42272117,42002116)资助。

摘　　要：塔里木盆地北部库车坳陷库姆格列木群(54-46 Ma)厚层含盐层系为油气成藏的优质区域盖层,但该套含盐层系的原始时空展布、古地理环境和沉积控制因素尚不明确,给盐下油气藏钻井施工造成了较大困难。通过盆缘野外露头剖面实测与盆内录井元素分析相结合,开展盐湖中心与边缘沉积旋回对比研究,探讨库姆格列木群含盐层系发育的主控因素。库姆格列木群发育3个Ⅲ级旋回:第1个Ⅲ级旋回Ⅰ_(1)以盆缘砂砾岩—泥岩—石膏岩组合、湖盆中心泥岩—石膏岩—盐岩—碳酸盐岩组合为特征,指示陆内盆地向陆缘盆地的古地理环境转变。第2个Ⅲ级旋回Ⅰ_(2)以盆缘砂砾岩—泥岩—石膏岩组合、湖盆中心厚层盐岩加泥岩组合为特征,为陆缘盆地盐湖沉积模式。第3个Ⅲ级旋回Ⅰ_(3)盆缘—盆内沉积具有相似的膏质泥岩和泥岩组合特征,为陆内干盐湖沉积模式。结合早始新世全球气候和海平面升降变化历史,认为Ⅰ_(1)旋回(约54-51 Ma)由陆内向陆缘环境的转变及厚层石膏岩的沉积受早始新世气候适宜期(53-51 Ma)和全球海平面升高的影响,Ⅰ_(2)旋回(约51-48 Ma)厚层盐岩的沉积受全球持续干旱气候和海平面再次升高的影响,而Ⅰ_(3)旋回(约48-46 Ma)厚层含盐层系沉积的缺失与全球气候持续干旱和海平面下降有关。The thick salt-bearing sequence in Paleogene Kumugeliemu Group(54-46 Ma)of the Kuqa Depression acts as the high-quality regional caps for oil and gas accumulation.However,the original temporal-spatial distribution,palaeogeographic environment,and sedimentary controlling factors of the salt-bearing sequence remain unclear,which causes great difficulties for the drilling of the subsalt hydrocarbon reservoirs.Through the outcrop measurement at the basin margin and the logging element analysis within the basin,the correlation of sedimentary cycles between the lake-basin center and the margin was carried out to explore the main controlling factors of the salt-bearing sequence deposition of Kumugeliemu Group.The Kumugeliemu Group consists of three third-order cycles.The first third-order cycleⅠ_(1) is characterized by the lithofacies assemblage of conglomerates,sandstones,mudstones and gypsums at basin margins,and of mudstones,gypsums,halites,carbonates at basin center,indicating an palaeogeographic-environment transformation from a terrigenous basin to a continental-margin basin.The second third-order cycleⅠ_(2) is characterized by the lithofacies assemblage of conglomerates,sandstones,mudstones,and gypsums at basin margins and the assemblage of thick halites and minor mudstones at basin center,corresponding to a depositional model of a terrigenous epeiric basin.The third third-order cycleⅠ_(3) has similar lithofacies assemblage at the lake-basin margin and center,characterized by thin layer gypseous mudstones and mudstones,typical depositional model of terrigenous playa lakes.Combined with the Early-Eocene global climates and sea-level changes,it is believed that the deposition of thick gypsum rocks ofⅠ_(1)(ca.54-51 Ma)were related to the Early Eocene Climatic Optimum(53-51 Ma)and global sea-level rise.The deposition of thick halite rocks inⅠ_(2)(ca.51-48 Ma)was controlled by the global dry climate and sea-level rise.The absence of thick salt-bearing sequence deposits inⅠ_(3)(ca.48-46 Ma)is related to the

关 键 词：含盐层系 物质来源 陆缘盆地 沉积旋回 库姆格列木群 库车坳陷 塔里木盆地 

分 类 号：P588.247[天文地球—岩石学]