干旱区生态环境知识资源中心(Arid): 柴达木盆地英西地区渐新统硫酸盐硫同位素组成及其地质意义

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	柴达木盆地英西地区渐新统硫酸盐硫同位素组成及其地质意义
其他题名	Sulfur isotopic composition of sulphate in Oligocene Series in Yingxi area, Qaidam Basin,and its geological significance
	陈启林; 张小军; 黄成刚; 李翔
来源期刊	地质论评
ISSN	0371-5736
出版年	2019
卷号	65 期号:3 页码:558-572
中文摘要	对柴达木盆地英西地区渐新统沉积环境和硫酸盐硫同位素组成进行了研究,刻画了硫化氢气体的形成机理及其对储层的改造作用,提出英西地区渐新统发生的TSR为其硫酸盐硫同位素组成的主控因素之一,并对储集层物性具有一定的改善作用.主要取得3项进展:①研究区为干旱气候、缺氧还原环境的咸化半深深湖沉积.Sr/Ba平均值为6.71,Fe/Mn平均值为44.35,(Fe+Al)/(Ca+Mg)平均值为0.45,以咸化半深-深湖沉积为主;Sr/Cu平均值为148.24,为干旱气候;U/Th平均值为0.55, w(V+Ni+Mn)平均值为495.77 g/g, V/(V+Ni)平均值为0.63,Ni/Co平均值为2.28,Cu/Zn平均值为1.00,为缺氧还原环境;②研究区硫酸盐硫同位素delta~(34)S偏重,主要受控于沉积环境和TSR硫同位素的分馏作用.硫酸盐种类主要包括硬石膏、芒硝、钙芒硝、天青石和重晶石等,以硬石膏分布最为广泛,其硫同位素delta~(34)S平均值为32.23,较同期海水明显偏重;③TSR对储集层物性、孔隙的连通具有一定的改善作用.TSR的产物H2S具有较强的溶蚀能力,可进入酸性流体难以进入的极小空间进行溶蚀改造,虽然其伴生的方解石沉淀可占据一定量的储集空间,但硫酸盐的消耗可产生一定量的次生孔隙,对储集层物性起到改善作用.
英文摘要	Objectives : Study the sedimentary environment and sulfate sulfur isotope composition of the Oligocene Series in the Yingxi area, Qaidam Basin, and its geological significance. Methods : The characteristics of main and trace elements,sulfate type,sulfate isotope composition and main controlling factors, the formation mechanism of H2S gas and its transformation effect on reservoirs were carried out. Resultst :① The average value of Sr/Ba in the study area is 6.71, the average Fe/Mn is 44.35,and the average value of (Fe+Al)/(Ca+Mg) is 0.45, which is the sedimentation of semi-deep lake in salinization; the average value of Sr/Cu is 148.24, which is arid climate; the average value of U/Th is 0.55,the average value of V+Ni+Mn is 495.77 g/g, the average value of V/(V+Ni) is 0.63, and the average value of Ni/Co is 2.28. The Cu/Zn average value is 1.00, which is an anoxic reduction environment.② There are many kinds of sulfates in the study area, including CaSO_4,Na_2SO_4 and CaNa2(SO_4)_2, SrSO_4 and BaSO_4. Among them, CaSO_4 is the most widely distributed, and the average value of sulfur isotope delta~(34) S is 32.23%o, which is obviously heavier than seawater in the same period. It is mainly controlled by a relatively closed sedimentary environment and fractionation of TSR sulfur isotope;③ TSR generally has a certain improvement effect on reservoir physical properties,although its associated calcite precipitation can occupy a certain amount of storage space. However, the consumption of sulfate can produce a certain amount of secondary pores. More importantly, the product of hydrogen sulfide in the TSR has a strong ability to dissolve,and can enter a very small space where the acidic fluid is difficult to enter. Conclusions : It is proposed that the TSR of the Oligocene in the Yingxi area,Qaidam Basin,is the main controlling factor of the sulfate sulfur isotope composition,and it has a certain improvement effect on the reservoir physical properties.
中文关键词	硬石膏 ; 硫同位素 ; 硫化氢 ; 硫酸盐热化学还原作用(TSR) ; 柴达木盆地英西地区
英文关键词	anhydrite sulfur isotope hydrogen sulfide (H2S) thermochemical sulfate reduction (TSR) Yingxi area, Qaidam Basin
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MULTIDISCIPLINARY SCIENCES
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:6494769
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/239037
作者单位	中国石油勘探开发研究院西北分院, 兰州, 甘肃 730020, 中国
推荐引用方式 GB/T 7714	陈启林,张小军,黄成刚,等. 柴达木盆地英西地区渐新统硫酸盐硫同位素组成及其地质意义[J],2019,65(3):558-572.
APA	陈启林,张小军,黄成刚,&李翔.(2019).柴达木盆地英西地区渐新统硫酸盐硫同位素组成及其地质意义.地质论评,65(3),558-572.
MLA	陈启林,et al."柴达木盆地英西地区渐新统硫酸盐硫同位素组成及其地质意义".地质论评 65.3(2019):558-572.