Hydrothermal activities of Paleogene Shahejie Formation in Qikou Sag and its effects on lacustrine carbonate reservoirs

被引：5
|
作者：
Yang Y. [1 ,2 ]
Gao F. [3 ]
Pu X. [4 ]
机构：
[1] School of Prespecting & Surveying Engineering, Changchun Institute of Technology, Changchun
[2] Jilin Laboratory for Oil Shale Drilling and Environmental Protection Engineering, Changchun
[3] College of Earth Sciences, Jilin University, Changchun
[4] Research Institute of Exploration and Development, Dagang Oilfield Company, CNPC, Tianjin
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2020年 / 44卷 / 02期
关键词：
Hydrothermal activities; Lacustrine carbonate; Paleogene; Qikou Sag; Reservoir property; Structural control;
D O I：
10.3969/j.issn.1673-5005.2020.02.003
中图分类号：
学科分类号：
摘要：
Based on observations of cores and thin sections, combined with the analysis of fluid inclusions and geochemical data, the control of hydrothermal activities on lacustrine carbonate reservoir porosity distributions of Paleogene Shahejie Formation in Qikou Sag was studied. The microscope analyses of carbonates show widely distributed saddle dolomites, which are associated with pyrites and quartzs. The geochemical data reveal light REE enrichment and positive Eu anomalies in most samples, coupled with low87Sr/86Sr ratios and high homogenization temperatures of fluid inclusions, indicating that Shahejie carbonates were deposited in hydrothermal environments. Numerous dissolution pores, corrosion fissures, and intergranular pores formed with CO2-enriched hydrothermal fluids, and the quality of reservoir property has been significantly improved. The subsequent dolomitization plays an important role, as they make the porosity slightly reduced. All available evidences show a strong structural control by extensional strike-slip faults. Negative flower structures on wrench faults are favored drilling sites for hydrothermal reservoir facies, probably resulting from Neogene thermal events. © 2020, Editorial Office of Journal of China University of Petroleum(Edition of Natural Science). All right reserved.
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页码：20 / 30
页数：10
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