沉积学报2024，Vol.42Issue(2)：619-631,13.DOI:10.14027/j.issn.1000-0550.2022.076
柴西咸水泉地区下油砂山组湖相沉积特征
Lacustrine Sedimentary Characteristics of the Pliocene Xiayoushashan Formation in Xianshuiquan Area,Western Qaidam Basin:A case study from cored interval of well Xiandong 1
摘要
Abstract
[Objective]Exploration practice of the Qaidam Basin show that the remaining petroleum in the Qaidam Basin is mainly concentrated in the western area,where relatively little exploration has been carried out due to the complex landform and the presence of typically low-permeability unconventional reservoirs.Accordingly,to increase petroleum exploration in the western Qaidam Basin.[Methods]A comprehensive study of the data from sedimentary structure observation,rock slices,X-ray diffraction whole-rock analyses and seismic data,among other techniques,was carried out on an interval of core from the Pliocene Xiayoushashan Formation in well Xiandong 1.[Results and Conclusions]The rock was found to comprise gray-black mudstone and shale interbedded with thin-to-medium mas-sive fine-grained greywacke.The top and bottom of the sand bodies are in abrupt contact with the mudstone.The lower boundary of the sand bodies is obviously an uneven erosional surface,and the mudstone and shale beneath the ero-sion surface exhibits deformed bedding.The sand bodies are sandy debris flow deposits formed by re-transport.The dark-gray to gray black calcareous mudstone and shale contains interbeds of calcirudite bearing shell-terrigenous de-bris and siltstone,and a silty mass with obviously deformed bedding.These laminae are clearly seen and have an ob-vious deformation direction caused by clastic slump.The Pliocene Xiayoushashan Formation in well Xiandong 1 is mainly the dark gray-gray black mudstone and shale interbedded with siltstone bearing dolomite,calcite and clay.The mudstone and shale contains horizontal rhythmic bedding.The siltstone has developed slightly dipping cross-beds with more clay laminae,climbing-ripple lamination and coarsely interlayered bedding,which are mainly from semi-deep lake deposits interbedded with weaker bottom flow deposits derived from sediment gravity flows.In addition,the deeper-water areas of the Altun Mountain front appears to have developed slump-sediment gravity flow sedimentary reservoirs similar to well Xiandong 1 at a different period of basin development,but further research into this aspect is needed.关键词
柴达木盆地/咸水泉地区/上新统/下油砂山组/岩心/沉积相Key words
Qaidam Basin/Xianshuiquan area/Pliocene/Xiayoushashan Formation/core/sedimentary facies分类
天文与地球科学引用本文复制引用
陈琰,谭莉,杜宗飞,王远飞,夏晓敏,李雅楠,赵健,崔俊,乔柏瀚,赵东升,高红灿,王义..柴西咸水泉地区下油砂山组湖相沉积特征[J].沉积学报,2024,42(2):619-631,13.基金项目
重庆市科委前沿与应用基础研究(一般)项目(cstc2014jcyjA90022) （一般）
重庆科技大学研究生科技创新计划项目(YKJCX2020103) Front and Applied Fundamental Research Plan of Chongqing Science&Technology Commission,No.cstc2014jcyjA90022 （YKJCX2020103）
Chongqing University of Science and Technology Graduate Science and Technology Innovation Project,No.YKJCX2020103 （）
