干旱区生态环境知识资源中心(Arid): 柴北缘平台地区下干柴沟组下段元素地球化学特征及意义

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	柴北缘平台地区下干柴沟组下段元素地球化学特征及意义
其他题名	Geochemical Characteristic and Significance of Elements in Lower Member of Lower Ganchaigou Formation in the Platform Area on North Margin of Qaidam Basin
	陈波 1; 薛雨见君 2; 赵云南 2; 钟萍 2; 陈汾君 2
来源期刊	特种油气藏
ISSN	1006-6535
出版年	2019
卷号	26 期号:1 页码:12-17
中文摘要	为查明柴北缘平台地区下干柴沟组下段古沉积环境演化及其对油气勘探的指示意义,综合运用对沉积环境反应敏感的主微量元素和碳氧同位素数据,对研究区的古气候、古盐度、氧化还原环境等古环境参数进行了综合研究。结果表明:气候指数表明研究区沉积时期干热和温湿气候共存,但整体上气候偏温暖湿润;锶、钡含量及delta~(13)C_(VPDB)与delta~(18)O_(VPDB)数据分析表明,沉积水体为盐度较高的淡水沉积;利用钒、镍、铬、钴等氧化还原判定指标的分析,反映研究区可能存在贫氧亚还原环境和富氧环境,但X衍射数据中仅出现反映氧化环境的赤铁矿,且利用钴元素估算的古水体深度大部分低于26 m;结合岩心数据分析,表明研究区主要发育以氧化环境为主的辫状河浅水沉积体系;基于元素地球化学分析的古环境演化结果可知,干湿气候交替出现,造成湖平面升降频繁,粗粒心滩相与细粒河漫滩相可呈互层状分布,为有利的储盖组合发育创造了条件。该研究结果对指导研究区油气勘探具有重要意义。
英文摘要	In order to find out the evolution of palaeosedimentary environment in the lower member of lower Ganchaigou Formation in the platform area on the north margin of Qaidam Basin and its indicative significance for oil and gas exploration,the main trace element and carbon-oxygen isotopic data sensitive to the sedimentary environment were used to study the paleoenvironment parameters like paleoclimate,paleosalinity and redox environment of the study area.The climate index showed that the arid and warm humid climates coexisted in the sedimentary period of the study area,but the climate was warm and humid on the whole.The analysis of strontium and barium contents as well as delta~(13)C_(VPDB) and delta~(18)O_(VPDB) data showed that the sedimentary water was freshwater deposit with high salinity.The analysis of redox indexes such as vanadium,nickel,chromium and cobalt showed that there might be oxygenpoor subreduction environment and oxygen-rich environment in the study area,but only hematite reflecting oxidation environment was found in X-ray diffraction data,moreover,the depth of fossil water depth estimated by cobalt element was less than 26 m;combined with the analysis of core data,it was judged that the shallow water sedimentary system of braided river dominated by oxidation environment was mainly developed in the study area.The paleoenvironmental evolution results obtained from element geochemistry analysis showed that the dry and wet climates occurred alternately,resulting in frequent fluctuation of lake level,and the coarse-grained channel bar facies and fine-grained alluvial flat facies exhibited interbedded distribution,which created conditions for the development of favorable reservoir-caprock assemblage.The study results are of great significance for guiding oil and gas exploration in the study area.
中文关键词	柴北缘平台地区 ; 下干柴沟组 ; 元素地球化学 ; 碳氧同位素 ; 沉积环境
英文关键词	platform area on north margin of Qaidam Basin Lower Ganchaigou Formation element geochemistry carbon and oxygen isotopes sedimentary environment
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENERGY FUELS
WOS研究方向	Energy & Fuels
CSCD记录号	CSCD:6450918
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/239570
作者单位	1.广西高校北部湾石油天然气资源有效利用重点实验室, 广西高校北部湾石油天然气资源有效利用重点实验室, 钦州, 广西 535000, 中国; 2.中国石油青海油田分公司, 敦煌, 甘肃 736202, 中国
推荐引用方式 GB/T 7714	陈波,薛雨见君,赵云南,等. 柴北缘平台地区下干柴沟组下段元素地球化学特征及意义[J],2019,26(1):12-17.
APA	陈波,薛雨见君,赵云南,钟萍,&陈汾君.(2019).柴北缘平台地区下干柴沟组下段元素地球化学特征及意义.特种油气藏,26(1),12-17.
MLA	陈波,et al."柴北缘平台地区下干柴沟组下段元素地球化学特征及意义".特种油气藏 26.1(2019):12-17.