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

Jiao Jian; Li Yingtao; Zhang Shaonan; Huang Qingyu; Ye Ning; Yuan Xiaoyu

doi:10.11781/sysydz201601099

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Jiao Jian, Li Yingtao, Zhang Shaonan, Huang Qingyu, Ye Ning, Yuan Xiaoyu. Geochemical features of saddle dolomites in the Penglaiba Formation, Yubei area, Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(1): 99-107. doi: 10.11781/sysydz201601099

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Jiao Jian, Li Yingtao, Zhang Shaonan, Huang Qingyu, Ye Ning, Yuan Xiaoyu. Geochemical features of saddle dolomites in the Penglaiba Formation, Yubei area, Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(1): 99-107. doi: 10.11781/sysydz201601099

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

doi: 10.11781/sysydz201601099

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

Received Date: 2015-08-13
Rev Recd Date: 2015-12-23
Publish Date: 2016-01-28

Abstract

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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References(36)

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

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

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