| Geochemical characteristics of the fluid inclusions in the Gangxi Fault Belt, Huanghua Depression, Bohai Bay Basin, China |
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| 引用本文： | 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[J]. 浙江大学学报(A卷英文版), 2007, 8(7): 1011-1020. DOI: 10.1631/jzus.2007.A1011 |
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| 作者姓名： | DING Wei-wei DAI Jin-xing CHU Feng-you HAN Xi-qiu |
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| 作者单位： | DING Wei-wei1，DAI Jin-xing2，CHU Feng-you1，HAN Xi-qiu1 (1Key Laboratory of Submarine Geoscience，the State Oceanic Administration，Hangzhou 310012，China) (2Department of Earth Science，Zhejiang University，Hangzhou 310027，China) |
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| 基金项目： | Project supported by the Key Laboratory of Marginal Sea Geology,South China Sea Institute of Oceanology, Chinese Academy of Sci-ences (No. MSGL0609)，the Chinese Academy of Sciences (No.KZCX2-209) |
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| 摘 要： | 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 sec- ondary 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 tec- tonic 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.
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| 关 键 词： | 流动物质 地球化学 物质构造 岩石 |
| 收稿时间： | 2006-10-20 |
| 修稿时间： | 2006-10-202006-11-21 |
Geochemical characteristics of the fluid inclusions in the Gangxi Fault Belt, Huanghua Depression, Bohai Bay Basin, China |
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| Wei-wei Ding,Jin-xing Dai,Feng-you Chu,Xi-qiu Han. Geochemical characteristics of the fluid inclusions in the Gangxi Fault Belt, Huanghua Depression, Bohai Bay Basin, China[J]. Journal of Zhejiang University Science, 2007, 8(7): 1011-1020. DOI: 10.1631/jzus.2007.A1011 |
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| Authors: | Wei-wei Ding Jin-xing Dai Feng-you Chu Xi-qiu Han |
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| Affiliation: | (1) Key Laboratory of Submarine Geoscience, the State Oceanic Administration, Hangzhou, 310012, China;(2) 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 sec- ondary 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 tec- tonic 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. |
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| Keywords: | Gangxi Fault Belt Fluid inclusion Composition Mantle-derived Maturity Local tectonic setting |
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