基于自然伽马测井曲线的旋回识别及古气候判断  

Study on Paleoclimate and Dentification of High Frequency Cycle Based on Natural Gamma Ray Logging Data

作　　者：陈云 唐闻强 张承志 伍新和 杨芸 邢浩婷 CHEN Yun;TANG Wenqiang;ZHANG Chengzhi;WU Xinhe;YANG Yun;XING Haoting(College of Earth Sciences,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu,Sichuan 610059,China;PetroChina Qinghai oilfield Company,Dunhuang,Gansu 736202,China;Oil and Gas Survey,China Geological Survey,Beijing 100083,China)

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]成都理工大学沉积地质研究院,四川成都610059 [3]中国石油青海油田公司,甘肃敦煌736202 [4]中国地质调查局油气资源调查中心,北京100083

出　　处：《测井技术》2021年第4期416-423,共8页Well Logging Technology

基　　金：中国地质调查局油气资源调查中心项目“色林错地区沉积构造特征调查”(DD20160160-04)。

摘　　要：尼玛盆地地处青藏高原腹地,由于环境恶劣交通不便等问题,导致尼玛盆地沉积旋回和层序地层研究程度极低。收集盆地内第1口探井(尼1井)的地球物理数据,利用自然伽马测井曲线对尼1井牛堡组一段进行频谱分析,共识别出405 kyr周期旋回37个、100 kyr周期旋回148个、54 kyr周期旋回274个、41 kyr周期旋回362个和23 kyr周期旋回646个,各周期对应旋回沉积厚度分别为17.7305、4.4623、2.3680、1.7873、1.0886 m,平均沉积速率44.03 m/Ma,沉积时限14.8 Ma。在此基础上,结合带通滤波变化趋势分析,认为该地区的气候反常现象由印度板块与亚欧板块的碰撞隆升引起,风化作用与焚风作用共同控制了高原内部的气候变化。The Nyima Basin is located in the central part of the Tibetan Plateau.Due to the harsh environment and inconvenient transportation,the research degree of sedimentary cycle and stratigraphic stratigraphy of the Nyima basin has been low.In this paper,the natural gamma logging curve is used to analyze the spectrum of the lower Niubao formation in the Ni-1 well.A total of five types of high-frequency sedimentary cycles are identified,in which 37 are preserved in 405 kyr periodic cycle,148 in 100 kyr periodic cycle,and 274 in 54 kyr periodic cycle,362 in 41 kyr periodic cycle and 646 in 23 kyr periodic cycle.It is considered that the sedimentary thickness of periodic cycle in the lower Niubao formation is 17.7305,4.4623,2.3680,1.7873 m and 1.0886 m respectively,average sedimentary rate is 44.03 m/Ma and the sedimentary time is 14.8 Ma.On this basis,combined with the trend of band-pass filter date change,we opine that the climate anomaly in this area is caused by the collision and uplift of Indian plate and Eurasian plate,and weathering and foehn control the climate change within the plateau.

关 键 词：自然伽马测井曲线 米兰科维奇旋回 频谱分析 沉积速率 古气候特征 尼玛盆地 牛堡组 

分 类 号：P539.2[天文地球—古生物学与地层学]