Reservoir-forming features of abiotic origin gas in Songliao Basin |
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| Authors: | Zhanqian Guo Xianbin Wang Wenlong Liu |
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| Institution: | (1) Research Institute of Exploration & Development of Daqing Petroleum Administrative Bureau, 163712 Daqing, China;(2) State Key Laboratory of Natural Gas & Geochemistry of Lanzhou Institute of Geology, Chinese Academy of Sciences, 730000 Lanzhou, China |
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| 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 density. There is an about 3-km-thick low density interval between the upper crust and the middle crust. This
interval may be a magma chamber accumulated in crust by “fluid phase” which is precipitated and separated from upper mantle
meltmass. The abiogenetic natural gas, other gaseous mass and hydrothermal fluids are provided to the Songliao rifted basin
through crustal faults and natural earthquakes. This is a basic condition to form an abiogenetic gas reservoir in the Songliao
Basin. On both flanks of the upper crust (or named basin basement) fault there are structural traps in and above the basement
and unconformity surface or lateral extended sand, which contains communicated pores, as migration pathway and natural gas
reservoir; up to gas reservoirs there is shale as enclosed cap rock, and the suitable arrangement of these conditions is the
basic features of abiogenetic gas reservoir.
Project supported by the National Natural Sc~ence Foundation of China. |
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| Keywords: | magma chamber deep fault unconformity surface trap reservoir cap rock earthquake |
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