Xinjiang Petroleum Geology ›› 2004, Vol. 25 ›› Issue (1): 90-94.

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Discussion on the Mid-Crust and Its Geological Implication

ZHANG Jing-lian, YU Jun-min   

  1. 1. Northwest Sub-Institute, Research Institute of Petroleum Exploration and Development, Lanzhou, Gansu 730020, China
  • Received:2003-07-14 Online:2004-02-01 Published:2020-08-06

Abstract: The deep structure of the earth crust is a topic focus. The relation among petroleum, metal deposit, earthquake and mid-crust is con-cerned. Low seismic velocity, high conductivity (low resistance), low density are the important geophysical features of the mid-crust. The investi-gation shows that when the seismic velocity of the mid-crust Pp<6.0 km/s, p<2.75 g/ cm', there exist hydrocarbon generation and oil-gas reser-voirs; when Vvp>6.0 km/s, p>2.75 g/cm', there exist Fe, Cu, Ni, Au and other metal deposits. To study the geological features of the mid-crust isof significance for exploration of oil-gas and metal deposits, particularly, for big and giant oil-gas fields and metal deposits, and for prediction ofthe earthquakes as well.

Key words: midcrust, low velocity belt, high conductive layer, crude oil, natural gas, metal, deposit, earthquake

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