Sedimentary characteristics and main controlling factors of the upper fourth member of Shahejie Formation in Zhanhua depression
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TE112.2

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    Abstract:

    Based on core observation and test and mud logging data analysis,the sedimentary characteristics and distribution of beach-bar in the upper fourth member of Shahejie Formation in Zhanhua depression were researched,and the main controlling factors were analyzed. The results show that there are sandy beach-bar and carbonate beach-bar in the study area. The sandy beach-bars mainly distribute in Luojia nose structure and in neighboring regions. The lithology of the sandy beach-bars is mainly gray fine sandstone and siltstone with good sorting and high maturity. Carbonate beach-bar is classified into organic reefs and limestone. The organic reefs mainly distribute along Yidong fault zone with a strip shape,and the lithology is mainly gray limestone and limy dolomite with poor sorting. They deposited generally in situ or settled down after a short distance migration. The limestone beach-bars mainly distribute in Shaojia sag,and the lithology is mainly gray limestone. The main controlling factors are paleo-climate,paleo-landform and paleo-provenance:the specific paleo-climate resulted in a lack of water in the study area;the ancient landform developed a steep slope zone in the north and a gentle slope zone in the south;and the paleo-provenance was characteristic of lacking western provenance. The distribution area,scale and type of the beach-bars are controlled by the three factors jointly.

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Liu Jiangtao, Deng Dawei, Liao Dongliang, Zhao Wenjie, Wang Wei. Sedimentary characteristics and main controlling factors of the upper fourth member of Shahejie Formation in Zhanhua depression[J]. Petroleum Geology and Recovery Efficiency,2015,22(1):42~46

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  • Received:
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  • Online: April 28,2015
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