干旱区生态环境知识资源中心(Arid): 昂达尔错地区布曲组碳酸盐岩碳氧同位素特征及意义

Arid

	昂达尔错地区布曲组碳酸盐岩碳氧同位素特征及意义
其他题名	The Characteristic and Meaning of Carbon and Oxyen Isotope of the Buqu Formation Carbonate at the Angdaercuo Area, South Qiangtang Basin
	卫红伟 1; 万友利 2; 李忠雄 1; 马龙 1
来源期刊	新疆地质
ISSN	1000-8845
出版年	2017
卷号	35 期号:3 页码:313-319
中文摘要	碳酸盐岩碳、氧同位素对古气候、古环境及成岩流体示踪具重要的指示意义。通过对羌塘盆地南部昂达尔错地区QZ-11井、QZ-12井布曲组岩心观察、薄片鉴定及碳氧同位素分析,结果表明:研究区布曲组是在炎热、半干旱-半潮湿古气候条件下,在台地边缘礁滩环境发育的一套碳酸盐岩沉积;岩性包括灰岩,白云岩及过渡性岩类,白云岩主要发育在高位体系域晚期台缘浅滩微相中,白云岩包括保留先驱灰岩原始组构的颗粒白云岩、泥微晶白云岩及先驱灰岩原始组构不可见的晶粒白云岩;研究区内的碳酸盐岩delta~(13)C_(PDB)分布范围为1.5~4,delta~(18)O_(PDB)分布范围为-7.6~-12.1,其中灰岩的delta~(13)C_(PDB)分布范围为1.5~2.9,普遍高于同期全球海水碳同位素值,推测可能与高位体系域晚期强蒸发及生物繁盛有关,白云岩和过渡性岩类中delta~(13)C_(PDB)分布范围为1.4~4,说明为继承先驱灰岩中碳同位素组成,局部可能受到白云石化流体的改造;氧同位素组成虽然普遍低于同期海水值,但白云岩中保留先驱灰岩原始组构的颗粒白云岩氧同位素值仍高于灰岩,表明其形成与蒸发环境有关,而细晶白云岩、中粗晶白云岩氧同位素组成呈逐步降低趋势,表明可能受埋藏阶段温度升高的影响。
英文摘要	The carbon and oxygen isotopes of carbonate are important to the paleoclimate, paleoenvironmental and diagenetic fluid tracers.This paper studies the carbon and oxygen isotopic characteristics of the reservoir and its significance to the oil and gas reservoir, by analysing the results of core observation, core identification and carbon-oxygen isotope of QZ-11 well and QZ-12 well. The results show that the depositional environment of Buqu Formation in study area is a set of carbonate deposits in the hot and semi-arid and semi-humid paleoclimate conditions.The lithology of this formation is divided into limestone, dolomite and transitional rock type, and it develops three dolomite types, the granite dolomite,the microcrystalline dolomite,and the precursor of the precursor which are the original structure of the pioneer limestone,and all of them are developed in shallow faces of platform edge in late high system tract.The distribution of delta~(13)C_(PDB) in the study area is 1.5 to 4 and delta~(18)O_(PDB) is in the range of -7.6 to -12.1 ,and the delta~(13)C_(PDB) in limestone is between 1.5 and 2.9 ,which is much higher than the average global ocean carbon isotope values in the same period, so the results are maybe related to the strong evaporation and biological prosperity in the late high system tract.While the distribution of delta~(13)C_(PDB) in dolomite and transitional rocks is 1.4 to 4 ,so it is suggested that it is inherited the precursor limestone, partially of them are modified by the dolomitized fluid.However,the oxygen isotopic composition of the dolomite is lower than that of the same period, but The oxygen isotope values of the granite dolomite in the original structure of the placard limestone in the dolomite remain higher than that of the limestone, it is suggested that this dolomite’s development is related to the evaporation,but the the oxygen isotopic composition of the fine - grained dolomite and the coarse - grained dolomite showed a decreasing trend, it indicates that it may be affected by the temperature rise in the burial stage.
中文关键词	昂达尔错 ; 白云石化流体 ; 古海洋环境 ; 碳-氧同位素 ; 布曲组
英文关键词	Angdaercuo area Dolomitization fluid Paleoceanic environment C-O isotopes Buqu formation
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:6105799
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236845
作者单位	1.中国地质调查局成都地质调查中心沉积与能源地质研究室, 成都, 四川 610081, 中国; 2.中国地质调查局成都地质调查中心沉积与能源地质研究室, 国土资源部沉积盆地与油气资源重点实验室, 成都, 四川 610081, 中国
推荐引用方式 GB/T 7714	卫红伟,万友利,李忠雄,等. 昂达尔错地区布曲组碳酸盐岩碳氧同位素特征及意义[J],2017,35(3):313-319.
APA	卫红伟,万友利,李忠雄,&马龙.(2017).昂达尔错地区布曲组碳酸盐岩碳氧同位素特征及意义.新疆地质,35(3),313-319.
MLA	卫红伟,et al."昂达尔错地区布曲组碳酸盐岩碳氧同位素特征及意义".新疆地质 35.3(2017):313-319.