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Overpressure Evolution Recorded in Fluid Inclusions in the Dongpu Depression, Bohai Bay Basin, North China

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Abstract

The Dongpu depression, like other depressions in the Bohai Bay Basin, is characterized by overpressure, however, the published studies have not clearly given the overpressure formation mechanism and paleo-pressure evolution history in the Dongpu depression. In addition, the current researches are mainly focused on the northern Dongpu depression, while rare investigation has been conducted in the southern part. In this context, it is urgent to explore the comprehensive overpressure evolution and formation mechanism in the Dongpu depression in academic and industrial fields. This paper provided a systematic analysis of fluid inclusions, including fluid inclusion petrography, microthermometry, vapor phase filling degree measurement and PVT-x modeling. By using homogenization temperature-burial history projection, the trapping time of the oil inclusions are determined. Four pressure evolution stages are identified in both the northern and the southern Dongpu depression. The results indicate that the pressure accumulation stage is derived by disequilibrium compaction and hydrocarbon generation in the northern part because of the salt rock distribution, while the stage is only derived by hydrocarbon generation in the southern part because of no salt rock distribution. The pressure release stages are mainly caused by the tectonic uplifting movements at the end of Dongying and Minghuazhen Formation. The overpressure in most areas in the northern part has been preserved till now, which is considered as a result of the good plasticity and sealing ability of salt rock that prevent the pressure leakage by smearing on the fault. Areas without salt rock distribution show normal pressure, which means the salt rock is an important factor that contributes to the overpressure preservation. However, there are exceptions that in Baimiao and Qiaokou, the overpressure still exists even without salt rock distribution, which is due to fault closure.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (No. 41730421). Major Science and Technology Project of SINOPEC during the 13th Five-Year Plan Period (No. ZDP1705). We appreciate the permmision of Zhongyuan Oilfield Company of SINOPEC to release the data. We thank associate editor Detian Yan and the anonymous reviewers for their thorough and critical reviews and suggestions. The final publication is available at Springer via https://doi.org/10.1007/s12583-020-1375-x.

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Authors and Affiliations

  1. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, 430074, China

    Xiuyan Liu, Honghan Chen & Xuewei Xiao

  2. Zhongyuan Oilfield Company, SINOPEC, Puyang, 457001, China

    Hongan Zhang & Tianwu Xu

  3. Xianhe Production Factory, Shengli Oilfield Company, SINOPEC, Dongying, 257086, China

    Yuwei Wang

  4. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, China

    Pei Shang & Lingtao Kong

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  1. Xiuyan Liu
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Correspondence to Honghan Chen.

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Liu, X., Chen, H., Xiao, X. et al. Overpressure Evolution Recorded in Fluid Inclusions in the Dongpu Depression, Bohai Bay Basin, North China. J. Earth Sci. 33, 916–932 (2022). https://doi.org/10.1007/s12583-020-1375-x

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