Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (1): 37-51.doi: 10.13278/j.cnki.jjuese.201501104

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Overpressure System Classification and Structure Characteristic in Bonan Sag

Luo Shengyuan1, He Sheng2, Jin Qiuyue3, Yang Ruizhi2, Zhang Junli2   

  1. 1. Wuhan Center, China Geological Survey, Wuhan 430205, China;
    2. Key Laboratory of Tectonics and Petroleum Resource of Ministry of Education, China University of Geosciences, Wuhan 430074, China;
    3. Zhanjiang Branch, CNOOC, Zhanjiang 524057, Guangdong, China
  • Received:2014-05-10 Published:2015-01-26

Abstract:

Bonan sag is a typical overpressured sag with abundant hydrocarbon resources, and present-day overpressures commonly occur in the Eocene third and fourth members of Shahejie Formation (Es3 and Es4) at depths between 2 300 m and 4 200 m. By assessing present-day pressure distribution and response from drilling stem test (DST), wire logging and geological date, the characteristics of overpressure and geological factors affecting abnormal pressure are discussed in detail. Sonic transit times of mudstones deviate from the normal compaction trend line to the overpressured area revealed by drilling, but density has no obvious response. On the whole, three overpressure systems have been identified, including an upper system distribution in Es1, a middle reservoir overpressure with main part in lower Es3, and a lower reservoir overpressure in the upper part of Es4. The second member in which sand contents are more than 20% generally shows normal pressure. This study indicates that sourced rocks, low permeability sealing rocks, and fault structure are the three major factors controlled the range of overpressure and its structure. Multiphase fluid from mud-rich sources rock composes material basis of an overpressured system. Compacted mudstone within Es1, and cemented sandstone interbeded with mudstone in Es3, as well as mudstone and gypsum beds distribution in the upper part of Es4, formed respectively barrier of each system, can also control the distribution and construction change of overpressures system. Fault structures, which has great influence on formation pressure and distribution of oil, show a complex and duality fault-fluid flow behavior. The optimized and calibrated seismic intervai-velocity data, in conjunction with measured pressure, have been used with considerable success in overall recognition of large-scale overpressured system in Bonan sag.

Key words: Bonan sag, well-log response, overpressure system, overpressure structure, Jiyang depression

CLC Number: 

  • P618.13

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