|Table of Contents|

Possible Former Oil-gas Reservoir in the Giant Jinding Pb-Zn Deposit, Lanping,NW-Yunnan:the Role in the Ore Accumulation(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2009年第03期
Page:
221-229
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Possible Former Oil-gas Reservoir in the Giant Jinding Pb-Zn Deposit, Lanping,NW-Yunnan:the Role in the Ore Accumulation
Author(s):
XUE Chun-ji1; 2; GAO Yong-bao3; CHI Guo-xiang4; David L Leach5
(1.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China; 2.School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; 3.Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, Shaanxi, China; 4.Department of Geology, University of Regina,Regina S4S0A2, Saskatchewan, Canada; 5.Denver Federal Center, US Geological Survey, Denver 80225, Colorado, USA)
Keywords:
oil-gas showings;  crude oil inclusions;  paleo-oil-gas reservoir;  giant Zn-Pb deposit;  Lanping basin
PACS:
P611;P593
DOI:
-
Abstract:
Oil-gas reservoir and metal deposits always coexist in the sedimentary basin, and the dynamic relationship between them has long been interested. The biggest zinc-lead deposit in China occurs in the Lanping Meso-Cenozoic sedimentary basin, Northwest Yunnan. Giant zinc-lead ores distribute in the Jinding dome, and cotain rich organic matters with different maturity, such as kerogen, light-and heavy crude oil, hydrocarbon gas, bitumen, and so on. Through research about lithofacies, biomarker compounds, carbon isotope and lead isotope of organic matters in Jinding deposit, some conclusions are drawn. Chloroform bitumen “A” of the organic matters is(72～395 415.42)×10-6. The ratio of saturated hydrocarbon to aromatic hydrocarbon is always over 1. Lots of biomakers such as N-Alkanes, Pr, Ph and iC18 are found in saturated hydrocarbon, and the parent material of biogenesis is mainly I-type. Compared with regional rocks, organic conversion rate of organic matters in the ores is lower, from 0.5% to 7.2%, showing obvious maturity. Many crude oil and hydrocarbon gas inclusions are found with transmission and ultraviolet light microscope. There are good conditions for generation, migration, storingr, covering, and trapping of oil-gas reservoir in Jinding dome, and oil-gas showings and remains of paleo-oil-gas reservoir are found in the ore region. All these indicate that a paleo-oil-gas reservoir had been formed before or during the mineralization, characterized by full of crude oil, hydrocarbon gas and hydrogen sulfide. The key points of large scale mineralization are accumulation of reducing gases, for instance, hydrogen sulfide, in Jinding oil-gas reservoir. The process from forming of oil-gas reservoir to mineralization is a continuous dynamic process, and the forming of oil-gas reservoir is the premise of mineralization.

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Last Update: 2009-09-20