Geochemical characteristics and diagenetic systems of dolomite reservoirs of the Changxing Formation in the eastern Sichuan Basin, China
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- 作者：Bing Zhang (1)
Rongcai Zheng (1)
Xuben Wang (1)
Chao Zheng (2)
Huaguo Wen (1)
Yuan Luo (3)
Yuelong Chi (1) - 关键词：Eastern Sichuan Basin ; Changxing Formation ; dolomite reservoir ; diagenesis ; geochemical characteristics ; diagenetic system
- 刊名：Petroleum Science
- 出版年：2012
- 出版时间：June 2012
- 年：2012
- 卷：9
- 期：2
- 页码：141-153
- 全文大小：1157KB
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Rongcai Zheng (1)
Xuben Wang (1)
Chao Zheng (2)
Huaguo Wen (1)
Yuan Luo (3)
Yuelong Chi (1)
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering, Chengdu University of Technology, Sichuan, 610059, China
2. Chongqing Gas Mine, PetroChina Southwest Oil and Gasfield Company, Chongqing, 401120, China
3. Sichuan Science and Technology Worker University, Sichuan, 610059, China - ISSN：1995-8226
文摘
In order to discuss the relationship between dolomite reservoirs and diagenetic systems of the Changxing Formation, we studied carbon, oxygen and strontium stable isotopes, iron, manganese and strontium trace elements and the Mg/Ca (mol%) ratio, dolomite order degree, and determined that burial dolomitization is the key to controlling the distribution of high quality dolomite reservoir in the Changxing Formation in the eastern Sichuan Basin. The dolomite of the Changxing Formation is divided into four diagenetic systems: (1) penecontemporaneous stage syngenetic brine diagenetic system, (2) early diagenetic stage strata seal brine diagenetic system, (3) middle-late diagenetic stage mixed hot brine diagenetic system and (4) tectonic uplift stage mixed hydrothermal fluid diagenetic system. New understanding of the controlling factors and distribution of dolomite reservoir development is discussed. Reef shoal facies belts controlled regional reservoir distribution and the scale of development. Burial dolomitization of a strata seal brine diagenetic system is the foundation of reservoir development, mainly developing pore reservoir. Burial dolomitization of mixed hot brine diagenetic system expanded the reservoir distribution and improved the reservoir quality, mainly developing pore-vug reservoir. Fracturing and dissolution of a mixed hydrothermal fluid diagenetic system is the key to improving the reservoir quality, mainly developing pore-vug-crack complex reservoirs.