Greigite in relict sediments, East China Sea continental shelf:implication for hydrocarbon seepage

WANG Zhang-hua; CHEN Zhong-yuan

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WANG Zhang-hua, CHEN Zhong-yuan. Greigite in relict sediments, East China Sea continental shelf:implication for hydrocarbon seepage[J]. Haiyang Xuebao, 2001, 23(5): 70-77.

Citation:

WANG Zhang-hua, CHEN Zhong-yuan. Greigite in relict sediments, East China Sea continental shelf:implication for hydrocarbon seepage[J]. Haiyang Xuebao, 2001, 23(5): 70-77.

WANG Zhang-hua, CHEN Zhong-yuan. Greigite in relict sediments, East China Sea continental shelf:implication for hydrocarbon seepage[J]. Haiyang Xuebao, 2001, 23(5): 70-77.

Citation:

WANG Zhang-hua, CHEN Zhong-yuan. Greigite in relict sediments, East China Sea continental shelf:implication for hydrocarbon seepage[J]. Haiyang Xuebao, 2001, 23(5): 70-77.

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Greigite in relict sediments, East China Sea continental shelf:implication for hydrocarbon seepage

Urban & Environmental Open Laboratory, Ministry of Education, East China Normal University, Shanghai 200062, China

Received Date: 2000-10-20
Rev Recd Date: 2001-02-26

Abstract

Abstract

Three hundred and seventy vibrocores were obtained from the East China Sea continental shelf during 1994~1995,aiming at surface geochemical exploration for oil and gas.Samples from the bottom o f each vibrocore were tested for magnetic properties.The result demonstrates there exist SIRM anomalies in the study area.It is suggested that greigite is the mineral causing the SIRM highs according to the magnetic properties.Magnetic minerals were separated from the high SIRM sediments to further identify them.Analyses conducted by scanning electron microscopy attached with energy dispersive X-ray analysis,X-ray diffracto grams,and Mssbauer spectrum prove that the magnetic separations are predominantly greigite and pyrrhotite.Distribution of SIRM highs in the study area coincides with that of the tectonic contr olled hydrocarbon traps and surface geochemical anomalies.This suggests that the greigite generating the SIRM anomalies of the study area is products of hydrocarbon seepage.It is thus proposed that SIRM can be selected as a proper parameter for magnetic detection of oil fields in the study area.
- SIR Manomaly,
- greigite,
- hydrocarbon seepage,
- relict sediments,
- East China Sea continental shelf

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References(16)

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