Distinguishing Indicators and Prospect Significance of Cambrian Dissolved Gypseous Breccias in the Southern Sichuan Basin
详细信息
- 责任者：Peng Yongmin (Exploration and Production Research Institute ; SINOPEC ; Beijing 100083 ; China) ; Gao Bo
- 刊名：Petroleum Geology & Experiment
- 出版年：2011
- 卷期：33(1)
- 关键词：油田水 ; oil field water ; 油气藏形成 ; reservoir formation ; 扬子地区 ; Yangtze Region
- 页码：p.22-27
- 图表：5 illus., 32 refs.
- 分类号：1003
- issnNo：ISSN1001-6112
- isbnNo：CN32-1151/TE
摘要
According to profile analyses of the Cambrian, several dissolved gypseous breccias were found in Zhuazhuayan (13 layers, over 30 m thick), Changping (4 layers, 17.5 m thick), Fandian (4 layers, over 20 m thick) and Sanhuichang (4 layers, 35 m thick). The dissolved gypseous breccias were divided into 2 types, including amaranth gypsum-bearing breccia mudstones and lark gypsum-dissolved breccia dolostones, with locally well preserved lamellar and flaser deposit structures. The breccias were generally 3 cm long and 2 cm wide. The compositions were micrite dolostones and the cements included clays and calcites. Initial rocks of the dissolved gypseous breccias were rhythmically banding dolomitic gypseous rocks, which could be compared with the Middle and Lower Cambrian gypseous rocks (10 layers, 26.9 m) from Well Dingshan 1. It is predicted that, from the southeast to the center of the basin, there exist thick gypseous rocks of lagoon facies.
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