东营凹陷现今大规模超压系统整体分布特征及主控因素

何生; 宋国奇; 王永诗; 郝雪峰; 王冰洁; 黎娜; 罗胜元

doi:10.3799/dqkx.2012.110

Volume 37 Issue 5

Sep. 2012

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Article Navigation > Earth Science > 2012 > 37(5): 1029-1042

HE Sheng, SONG Guo-qi, WANG Yong-shi, HAO Xue-feng, WANG Bing-jie, LI Na, LUO Sheng-yuan, 2012. Distribution and Major Control Factors of the Present-Day Large-Scale Overpressured System in Dongying Depression. Earth Science, 37(5): 1029-1042. doi: 10.3799/dqkx.2012.110

Citation:

HE Sheng, SONG Guo-qi, WANG Yong-shi, HAO Xue-feng, WANG Bing-jie, LI Na, LUO Sheng-yuan, 2012. Distribution and Major Control Factors of the Present-Day Large-Scale Overpressured System in Dongying Depression. Earth Science, 37(5): 1029-1042. doi: 10.3799/dqkx.2012.110

Citation:

HE Sheng, SONG Guo-qi, WANG Yong-shi, HAO Xue-feng, WANG Bing-jie, LI Na, LUO Sheng-yuan, 2012. Distribution and Major Control Factors of the Present-Day Large-Scale Overpressured System in Dongying Depression. Earth Science, 37(5): 1029-1042. doi: 10.3799/dqkx.2012.110

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Distribution and Major Control Factors of the Present-Day Large-Scale Overpressured System in Dongying Depression

doi: 10.3799/dqkx.2012.110

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Sinopec Shengli Oilfield Company, Dongying 257015, China

Received Date: 2012-05-12
Available Online: 2021-11-10
Publish Date: 2012-09-15

Abstract

Abstract

Dongying depression is a typical overpressured depression with abundant petroleum resources, and the present-day large-scale overpressured system occurs in the Eocene third and fourth members of the Shahejie Formation (Es₃-Es₄) in the depression as evidenced by drill stem test (DST) data, and the source rocks also exist within the overpressured system. Based on a large number of drill stem test (DST) data, the burial depths of overpressured sandstone reservoirs range from 2 200 to 4 400 m with excess pressures of about 4 to 40 MPa and pressure coefficients of 1.2 to 1.99. According to the integrated interpretation of drilling, well logging and seismic velocity data, the large-scale overpressured system is associated with significant increase in drilling mud density, as well as abnormal high sonic transit times with deviation from the normal trend and low seismic interval velocity responding. On the whole, the burial depths of the top overpressured surface range from 2 200 to 2 900 m with corresponding formation temperatures ranging from 90 to 120 ℃, and the depths of top overpressure surface increase as the burial depths of source rocks deepen. Many evidences suggest that the oil generation from the source rocks is the major cause of the present-day large-scale overpressured system in the Es₃-Es₄ of Dongying depression. This study indicates that the large-scale overpressured system is well developed where the cumulative thickness of mature source rocks is thick and source rocks remain in oil-generating stage of thermal evolution with vitrinite reflectance values varying from 0.5% to 1.2% of overpressured source rocks, and the fault system and sandstone transporting layers have great influence on the distribution and construction change of the large-scale overpressured system in the Es₃-Es₄ of Dongying depression.

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Distribution and Major Control Factors of the Present-Day Large-Scale Overpressured System in Dongying Depression

doi: 10.3799/dqkx.2012.110

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