Research on the Reef Characteristic of Changxing Formation in
Yuanba Area of Northeast Sichuan Province

doi:10.11885/j.issn.1674-5086.2013.03.11.06

Abstract

Abstract:

The discovery of Puguang Gas Field inspired explorers to turn to Yuanba Area，which is also a part of Kaijiang– Liangping shelf edge. The new exploration indicates the great exploration potential with Changxing Formation in Yuanba Area. Based on the comprehensive analysis of seismic，drilling and core data，we made detailed researches on the reef depositional characteristics of Changxing Formations in northeastern Sichuan. The results show that the reefs are mainly developed in the 2nd member of Changxing Formation，and the different sedimentary environments control characteristics of reefs′ growth and development. The reefs closed to the edge of the western wide sea are better developed than the reefs closed to the edge of the eastern wide sea and the tidal channel edge，and they have a larger scale，and theirs buildups characteristics are very prominent. In the area of wide sea edge，because of the stronger hydrodynamic and the richer nutrient，the skeleton reefs are usually developed and they usually have anti-wave structures. But in the area of tidal channel edge，because of the relatively weaker hydrodynamic and the lack of nutrients，the bafflereefs are usually developed. At the late Changxing stage，in the western Yuanba Area，the depositional environment is fit for the development of the reefs because of the terrain uplift. So the favorable growing area of reef is characteristic of migration from east to west.

Key words: northeastern Sichuan, Yuanba Area, Changxing Formation, reef, depositional characteristics

Deng Jian1, Duan Jinbao1, Wang Zhenghe2, Wang Mingfa1. Research on the Reef Characteristic of Changxing Formation in Yuanba Area of Northeast Sichuan Province[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.03.11.06.

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Research on the Reef Characteristic of Changxing Formation in Yuanba Area of Northeast Sichuan Province

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