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Volume 12 Issue 1
Mar 2001
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Jiaren Ye, Honghan Chen, Xianghua Yang. Fluid Dynamic Field in Bozhong Depression, Bohai Bay Basin. Journal of Earth Science, 2001, 12(1): 84-89.
Citation: Jiaren Ye, Honghan Chen, Xianghua Yang. Fluid Dynamic Field in Bozhong Depression, Bohai Bay Basin. Journal of Earth Science, 2001, 12(1): 84-89.

Fluid Dynamic Field in Bozhong Depression, Bohai Bay Basin

Funds:

the Foundation for University Key Teacher by the Ministry of Education, China GG-170-10491-1460

  • Received Date: 18 Sep 2000
  • Accepted Date: 11 Dec 2000
  • The data from regional geology, boreholes, geophysics and tests are integrated to analyze the fluid dynamic field in the Bozhong depression, Bohai Bay basin. The current geothermal gradient is determined to be about 2.95 ℃/100 m by integrating 266 drill-stem test (DST) measurements and comparing with the global average value. The paleogeothermal gradients are calculated from the homogenization temperatures of saline inclusions, which vary both laterally and vertically. The data from sonic logs, well tests and seismic velocities are used to investigate the pressure variations in the study area. The mudstone compaction is classified as three major types: normal compaction and normal pressure, under-compaction and overpressure, and past-compaction and under- overpressure. The current pressure profile is characterized by normal pressure, slight pressure and intense overpressure from top to bottom. The faults, unconformity surfaces and interconnecting pores constitute a complex network of vertical and horizontal fluid flows within the depression. The fluid potential energy profiles present a"doubledeck"structure. The depocenters are the area of fluids supply, whereas the slopes and uplifts are the main areas of fluids charge.

     

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