RESERVOIR-FORMING FEATURES OF ABIOTIC ORIGIN GAS IN SONGLIAO BASIN

Citation
Zq. Guo et al., RESERVOIR-FORMING FEATURES OF ABIOTIC ORIGIN GAS IN SONGLIAO BASIN, SCIENCE IN CHINA SERIES D-EARTH SCIENCES, 40(6), 1997, pp. 621-626
Citations number
6
Language
INGLESE
art.tipo
Article
ISSN journal
1006-9313
Volume
40
Issue
6
Year of publication
1997
Pages
621 - 626
Database
ISI
SICI code
1006-9313(1997)40:6<621:RFOAOG>2.0.ZU;2-J
Abstract
The vertical structure of the crustal block of the Songliao Basin can be divided into upper, middle and low Earth's crust according to densi ty. There is an about 3-km-thick low density interval between the uppe r crust and the middle crust. This interval may be a magma chamber acc umulated in crust by ''fluid phase'' which is precipitated and separat ed from upper mantle meltmass. The abiogenetic natural gas, other gase ous mass and hydrothermal fluids are provided to the Songliao rifted b asin through crustal faults and natural earthquakes. This is a basic c ondition to form an abiogenetic gas reservoir in the Songliao Basin. O n both flanks of the upper crust (or named basin basement) fault there are structural traps in and above the basement and unconformity surfa ce or lateral extended sand, which contains communicated pores, as mig ration pathway and natural gas reservoir; up to gas reservoirs there i s shale as enclosed cap rock, and the suitable arrangement of these co nditions is the basic features of abiogenetic gas reservoir.