塔里木盆地玉北地区蓬莱坝组鞍形白云石地球化学特征

焦健; 李映涛; 张哨楠; 黄擎宇; 叶宁; 袁晓宇

doi:10.11781/sysydz201601099

塔里木盆地玉北地区蓬莱坝组鞍形白云石地球化学特征

doi: 10.11781/sysydz201601099

焦健^1,2,3,
李映涛^4,5,
张哨楠^1,2,
黄擎宇⁶,
叶宁^4,5,
袁晓宇⁷

1.
西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610501
2. 西南石油大学地球科学与技术学院, 成都 610501
3. 中国石化集团国际勘探开发有限公司, 北京 100083
4. 成都理工大学油气藏地质及开发工程国家重点实验室, 成都 610059
5. 成都理工大学能源学院, 成都 610059
6. 中国石油勘探开发研究院, 北京 100083
7. 中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

基金项目: 中国石化西北油田分公司项目"顺南-古隆地区奥陶系碳酸盐岩储层成因及模式研究"(3440008-14-ZC0607-0023)资助。

详细信息

作者简介:
焦健(1987-),男,硕士,工程师,从事储层地质与储层地球化学研究。E-mail:jjiao.sipc@sinopec.com。

中图分类号: TE122.2⁺3
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出版历程
- 收稿日期: 2015-08-13
- 修回日期: 2015-12-23
- 刊出日期: 2016-01-28

Geochemical features of saddle dolomites in the Penglaiba Formation, Yubei area, Tarim Basin

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610501, China
2. College of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610501, China
3. SINOPEC International Exploration and Production Corporation, Beijing 100083, China
4. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, CDUT, Chengdu, Sichuan 610059, China
5. Energy College, CDUT, Chengdu, Sichuan 610059, China
6. Research Institution of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
7. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

摘要: 根据岩相特征将玉北地区蓬莱坝组白云岩分为粉细晶基质白云岩、粗晶基质白云岩和鞍形白云石充填物。鞍形白云石充填物各类地化特征都与粗晶基质白云岩相似,是粗晶基质白云岩自身溶解后又在缝洞内形成的一种再沉淀,应该属于白云石胶结物,而与交代灰岩作用无关。高温、高盐度的地层卤水应该是鞍形白云石充填物形成的主要成岩流体。微量元素方面,粉细晶基质白云岩的Sr含量明显高于粗晶基质白云岩和鞍形白云石充填物,而鞍形白云石充填物的Ba含量远远高于基质白云岩和粗晶基质白云岩;Mg/Ca比方面,三者差别极小;鞍形白云石充填物与基质白云岩稀土含量都很低且配分曲线特征相似,稀土分异程度相近;包裹体测温、测盐显示鞍形白云石充填物与基质粗晶白云岩在流体性质上存在重叠,表明其在流体性质上存在对基岩的继承性。
- 鞍形白云石 /
- 成岩流体 /
- 地球化学 /
- 蓬莱坝组 /
- 玉北地区 /
- 塔里木盆地
Abstract: Dolomites of the Penglaiba Formation in Yubei area were divided into fine-crystalline matrix dolomites, coarse-crystalline matrix dolomites and saddle dolomite fillings according to the petrographic features. The saddle dolomite fillings have geochemical features similar to the coarse-crystalline matrix dolomites. They appear to be dolomite cements, and are not associated with limestone replacement. Diagenetic fluids for saddle dolomite fillings are inferred to be high-temperature and high-salinity formation brines. The average Sr content of fine-crystalline matrix dolomites is higher than that of coarse-crystalline matrix dolomites and saddle dolomite fillings, while the average Ba content of saddle dolomite fillings is much higher than that of matrix dolomites and coarse-crystalline matrix dolomites. The Mg/Ca ratios of fine-crystalline matrix dolomites, coarse-crystalline matrix dolomites and saddle dolomite fillings are similar. The REE distribution curves of saddle dolomite fillings and matrix dolomites are similar. The inclusion analyses of coarse-crystalline matrix dolomites and saddle dolomite fillings show overlapping fluid properties, which indicates that saddle dolomite fillings are inherited from matrix dolomites.
- saddle dolomite /
- diagenetic fluid /
- geochemistry /
- Penglaiba Formation /
- Yubei area /
- Tarim Basin

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