古地理学报2012，Vol.14Issue(6)：777-785,9.
滨里海盆地东缘石炭系KT-Ⅰ油层组白云岩地球化学特征
Geochemical characteristics of the Carboniferours KT-Ⅰ interval dolostone in eastern margin of coastal Caspian Sea Basin
石新 1程绪彬 2汪娟 1李兆影 1金树堂 1郭洪明 3朱萌3
作者信息
- 1. 川庆钻探公司地质勘探开发研究院,四川成都610051
- 2. 西南石油大学,四川成都610500
- 3. 中油阿克纠宾油气股份公司,哈萨克斯坦阿克纠宾000030
- 折叠
摘要
Abstract
The KT- I interval carbonate unit of the Upper Carboniferours is composed of a shallow marine carbonate rock with some evaporate strata, which is dolomitized in the Coastal Caspian Sea Basin, Aktyubinsk, Kazakstan. The fine-crystalline dolostone (mud-dominated) with vug porosity is the most important oil reservoir in the KT-1 interval carbonate unit. Study shows that the KT- I interval dolomite is characterized by micrite, silt or fine crystals with subhedral or anhedral form, ordering index of 0. 336 ~ 0. 504, and slight enrichment of calcium. The dolomite contains stable isotopic oxygen composition of -1. 06‰ ~ +2. 45‰PDB ( average, +0. 4‰) , which is positive to sea water ( Carboniferous) , and carbon composition of +3. 36‰ ~ +5. 94‰PDB which is approximate to sea water. Its stable isotopic strontium composition is 0. 708 265 ~ 0. 708 750, which is approximate to that of sea water or evaporative sea water. The trace element content of 92. 57 μg/g (average) for Mn, and 447. 52 μg/g (average) for Fe of the KT- I interval dolostone, are lower than Mn and Fe content in the burial dolostone, while the trace element content of Na, K and Sr are more than those in the replaceable limestone. The above data about the KT- I interval dolostone show that the dolomitization was formed in the near surface evaporative condition, which is characterized by seepage-reflux.关键词
滨里海盆地/碳酸盐岩台地/石炭系/渗透—回流白云石化/地球化学特征Key words
coastal Caspian Sea Basin/carbonate platform/Carboniferous/seepage-reflux dolomitization /geochemical characteristic分类
天文与地球科学引用本文复制引用
石新,程绪彬,汪娟,李兆影,金树堂,郭洪明,朱萌..滨里海盆地东缘石炭系KT-Ⅰ油层组白云岩地球化学特征[J].古地理学报,2012,14(6):777-785,9.
