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Characteristics of Abnormal High Pressure in Linnan Sag and Its Formation Mechanism

Dong Liu

Abstract


The Linnan Sag is located in the west of Jiyang Depression in the Bohai Bay Basin, and its Shahejie Formation
has developed significant abnormal high pressure. Based on logging data and measured pressure data, this paper
discusses the development characteristics of abnormal high pressure; clarifies the cause mechanism of abnormal high
pressure; the study found that abnormal high pressures are generally developed in the the Es3z and Es3x and the Es4s in
the depression area, and the pressure coefficient is 1.1~1.4, and the development of abnormal high pressure in the center
of the depression is particularly remarkable, and the remaining pressure is above 20MPa. The central uplift belt and
southern slope in the northeastern part of the study area showed a normal pressure state as a whole, and isolated small
abnormal high pressure systems developed locally. The most important cause of the abnormal high pressure in the Shahejie
Formation may be the transmission of overpressure caused by the undercompaction of mudstone, and on this basis,
the pressurization caused by hydrocarbon generation and dehydration of clay minerals is superimposed.

Keywords


Abnormal high pressure; controlling factors; development characteristics; Shahejie Formation; Linnan Sag

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References


Jin Zhijun, Xie Fangke. Characteristics of formation pressure distribution in typical petroliferous basins in China[J]. Journal of the University of Petroleum (Natural Science Edition), 2002(06): 1-6+16-9.

Li Wei, Zhao Wenzhi, Liu Zongcheng. Research on the relationship between overpressured mud and hydrocarbon migration and accumulation in the squeeze basins of Northwest China[J]. Petroleum Exploration and Development, 1997(05): 15-19+119.

Dai Lichang, Liu Zhen, Zhao Yang, Zhang Shanwen, Cai Jingong. Characteristics and causes analysis of abnormal high pressure and abnormal low pressure in Jiyang Depression[J]. Earth Science Frontier, 2003(03):158.

Fertl, W.H., Abnormal Formation Pressures. Elsevier, 1976:382.

Louden, L.R.,Origin and maintenance of abnormal pressures. SPE3843,3rd Symp, 1972.

Shao Xinjun, Xu Yun, Lu Zhongfeng, Mao Tinghui. Discussion on the prediction method of formation fluid pressure[J]. Petroleum Exploration and Development, 2000(03): 100-102+116-126

Liu Chunying. Research on formation pressure prediction technology of logging while drilling [D]. China University of Petroleum (East China), 2014.

Liu Yi. Characteristics of Shahejie Formation Shale Oil Reservoir in Jiyang Depression, Bohai Bay Basin[D]. Chengdu University of Technology, 2018.

Lin Zhongkai, Jiang Lei. Seismic characteristics and fine description of turbidite sand bodies in the third member of Shahejie Formation in Linnan Sag[J]. Journal of Oil and Gas Technology, 2012, 34(04): 73-77+167.

Shengli Petroleum Geology Compilation Group. Petroleum Geology (Volume 6) Beijing: Petroleum Industry Press, 1993, 168

Wang Bing,Zhang Likuan,Li Chao,Chen Kaiyuan,Song Guoqi,Luo Hongmei.Genetic mechanism and distribution prediction of overpressure in the Paleogene Shahejie Formation in Linnan Sag, Huimin Depression[J].Oil and Gas Geology,2018,39(04): 641-652.




DOI: http://dx.doi.org/10.18686/ag.v5i1.3296

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