北羌塘盆地雀莫错组三段混合沉积层系发育特征及控制因素  

Development features and controlling factors of mixed siliciclastic-carbonate sediments in the Member 3 of the Quemocuo Formation,Northern Qiangtang Basin

作　　者：高远 付修根[4] 万友利 王忠伟 宋春彦[3,5] 李学仁 GAO Yuan;FU Xiugen;WAN Youli;WANG Zhongwei;SONG Chunyan;LI Xueren(Chinese Academy of Geological Sciences,Beijing 100037,China;China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Sedimentary Basin and Oil and Gas Resources,Ministry of Natural Resources,Chengdu,Sichuan 610081,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Chengdu Geological Survey,China Geological Survey,Chengdu,Sichuan 610081,China)

机构地区：[1]中国地质科学院,北京100037 [2]中国地质大学(北京),北京100083 [3]自然资源部沉积盆地与油气资源重点实验室,四川成都610081 [4]西南石油大学地球科学与技术学院,四川成都610500 [5]中国地质调查局成都地质调查中心,四川成都610081

出　　处：《东北石油大学学报》2020年第3期36-45,106,I0003,共12页Journal of Northeast Petroleum University

基　　金：国家自然科学基金项目(41902138);中国博士后基金项目(2019M663558);中国地质调查局项目(DD20190116);中国地质调查局项目(DD20160159)。

摘　　要：利用羌科1井元素录井数据,采用频谱分析方法,综合沉积环境分析及海平面变化,研究北羌塘盆地雀莫错组三段混合沉积层系的发育特征和控制因素。结果表明:长周期海平面较低的位置,容易形成碳酸盐岩和碎屑岩的高频混合沉积层系;长周期海平面较高的位置,不容易出现高频混合沉积现象,岩性较稳定。混合沉积发育规律是沉积环境对海平面变化的响应。长周期海平面变化引起沉积环境的变化,产生陆源碎屑输入与碳酸盐岩生产力的变化,控制大尺度的混合沉积发育特征;短周期海平面变化受天文旋回的控制,引起高频海平面波动,产生高频混合沉积层系。同时,不同尺度海平面变化的叠加,控制雀莫错组三段长周期和短周期混合沉积层系发育的相互关系。该研究对认识羌塘盆地侏罗系的地层特征和沉积演化具有指导意义。We investigated features and controlling factors of mixed siliciclastic-carbonate sediments in the Quemocuo Formation of the Northern Qiangtang Basin,by combining geochemical data,carrying out spectral analysis,and analyzing sealevel changes.The result shows that high-frequency mixed siliciclastic-carbonate sediments occurred in long-term sea-level lowstand,and invariant lithology sediments occurred in long-term sea-level highstand.The feature suggests that there is a linear response of sedimentary environment to sea-level changes.The long-term sea-level change caused changes in sedimentary environments,and then controlled mixed siliciclastic-carbonate sediments in the large scales.The short-term sea-level change which was controlled by the earth's orbital parameters,caused high-frequency sea-level changes,and then controlled high-frequency mixed siliciclastic-carbonate sediments.The sum of sea-level changes in different scales controlled features of the mixed siliciclastic-carbonate sediments in different scales in the Quemocuo Formation.Studying mixed siliciclastic-carbonate sediments is important for understanding the stratigraphic characteristics and sedimentary evolution in the Jurassic Qiangtang Basin.

关 键 词：频谱分析 混合沉积 海平面变化 发育特征 控制因素 雀莫错组 羌塘盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]