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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2007, Vol. 8 Issue (7): 1011-1020    DOI: 10.1631/jzus.2007.A1011
Materials Science & Chemical Engineering     
Geochemical characteristics of the fluid inclusions in the Gangxi Fault Belt, Huanghua Depression, Bohai Bay Basin, China
DING Wei-wei, DAI Jin-xing, CHU Feng-you, HAN Xi-qiu
Key Laboratory of Submarine Geoscience, the State Oceanic Administration, Hangzhou 310012, China; Department of Earth Science, Zhejiang University, Hangzhou 310027, China
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Abstract  We studied the geochemical characteristics of the fluid inclusions in the Ordovician carbonates and the Oligocene Shahejie Formation sandstones from 15 wells in the Gangxi Fault Belt, Huanghua Depression. The fluid inclusions are all secondary with gas/liquid ratio of 5%~10%. Base on Raman they are mainly composed of H2O, CO2 and CH4. The homogenization temperatures, combined with burial and geothermal history of the host rock, indicate that the fluid flows in the Shahejie Formation and the Ordovician carbonates were trapped in Neocene. Using a VG5400 mass spectrometer, the helium isotopic compositions were analyzed. Interpretation of results suggested a significant amount of mantle-derived helium mainly accumulating in the intersections of the NWW trending Xuzhuangzi and NE trending Gangxi faults. The maturity of hydrocarbon decreases from the intersection to the outside pointing out that the fluid related to the NWW trending Xuzhuangzi and NE trending Gangxi faults. These factors implied the fluid inclusions have a close relationship to the local tectonic setting. Gangxi Fault Belt experienced intensive Neo-tectonic activities in Cenozoic. Widespread faulted-depressions and strong volcanic eruptions manifested its tectonic status of extensional stress field. Mantle uplift caused the movement of magma that carried mantle-derived gases and deep heat flows, the deep-rooted tension faults provided the passages for the gases and heat flows to shallow crust levels.

Key words： Gangxi Fault Belt      Fluid inclusion      Composition      Mantle-derived      Maturity      Local tectonic setting     
Received: 20 October 2006     
CLC:  P58  
  P59  
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DING Wei-wei
DAI Jin-xing
CHU Feng-you
HAN Xi-qiu
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DING Wei-wei, DAI Jin-xing, CHU Feng-you, HAN Xi-qiu. Geochemical characteristics of the fluid inclusions in the Gangxi Fault Belt, Huanghua Depression, Bohai Bay Basin, China. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(7): 1011-1020.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2007.A1011     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2007/V8/I7/1011

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