塔里木盆地麦盖提斜坡石炭系碳酸盐岩和碎屑岩交替沉积的沉积环境分析
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摘要
通过对塔里木盆地麦盖提斜坡石炭系的岩石学特征、沉积特征、测井曲线特征以及地震特征的研究 ,首先将该区石炭系划分为8个岩性段 ,其中有 3个碳酸盐岩岩性段和 5个碎屑岩岩性段 ,即从下至上发育东河砂岩段 (C8)、下泥岩段 (C7)、生屑灰岩段 (C6)、中泥岩段 (C5)、标准灰岩段 (C4)、上泥岩段 (C3 )、砂泥岩段 (C2 )、小海子灰岩段 (C1 )。其后通过现场的岩心观察和室内的薄片鉴定以及同位素和微量元素测试 ,对各岩性段进行沉积环境分析 ,得出了沉积相的垂向分布图。这较以前的以组为单位的研究要精确许多 ,能更准确地指导石油勘探。最后鉴于本区石炭系属碳酸盐岩和碎屑岩的混积成因 ,通过这次研究对其成因进行了探讨。
By study on the petrology,sedimentary,logging curve and seismic characteristics of the Carboniferous in the Maigaiti Slope of the Tarim Basin,the Carboniferous of the area was divided into eight lithologic members including three carbonate rock ones and five detrital rock ones, that is, the Donghe Sandstone Member (C 8),the Lower Mudstone Member (C 7), the Bioclast Limestone Member (C 6),the Middle Mudstone Member (C 5), the Standard Limestone Member (C 4), the Upper Mudstone Member (C 3), the Sand-Mudstone Member (C 2) and the Xiahaizi Limestone Member (C 1) from bottom to top.By in-situ core observation and indoor thin-section identification as well as stable isotope and trace clement testing, the sedimentary environment of each lithologic member was analysed,and the vertical distribution of sedimentary facies was obtained.Compared with study taking formations as units before,it is more precise and can direct petroleum exploration correctly. In view of the mixed sedimentation genesis of the Carboniferous by carbonate and detrital rocks in the area,this paper made a discussion on it.
By study on the petrology,sedimentary,logging curve and seismic characteristics of the Carboniferous in the Maigaiti Slope of the Tarim Basin,the Carboniferous of the area was divided into eight lithologic members including three carbonate rock ones and five detrital rock ones, that is, the Donghe Sandstone Member (C 8),the Lower Mudstone Member (C 7), the Bioclast Limestone Member (C 6),the Middle Mudstone Member (C 5), the Standard Limestone Member (C 4), the Upper Mudstone Member (C 3), the Sand-Mudstone Member (C 2) and the Xiahaizi Limestone Member (C 1) from bottom to top.By in-situ core observation and indoor thin-section identification as well as stable isotope and trace clement testing, the sedimentary environment of each lithologic member was analysed,and the vertical distribution of sedimentary facies was obtained.Compared with study taking formations as units before,it is more precise and can direct petroleum exploration correctly. In view of the mixed sedimentation genesis of the Carboniferous by carbonate and detrital rocks in the area,this paper made a discussion on it.
引文
[1] 顾家裕.塔里木盆地沉积层序特征及其演化[M ].北京:石油工业出版社,1996.
[2] 冯增昭.沉积岩石学[M ].北京:石油工业出版社,1993.
[3] 张秀莲.碳酸盐岩中氧、碳同位素与古盐度、古水温的关系[J].沉积学报,1985,3(4).
[4] 王大锐,白玉雷,贾承造.塔里木盆地中上奥陶统碳同位素组成正向偏移的石油地质意义[J].石油勘探与开发,1998,25(4).
[2] 冯增昭.沉积岩石学[M ].北京:石油工业出版社,1993.
[3] 张秀莲.碳酸盐岩中氧、碳同位素与古盐度、古水温的关系[J].沉积学报,1985,3(4).
[4] 王大锐,白玉雷,贾承造.塔里木盆地中上奥陶统碳同位素组成正向偏移的石油地质意义[J].石油勘探与开发,1998,25(4).