THE DIFFUSION INFLUENCE ON GAS POOL: DAWANQIOILFIELD AS AN EXAMPLE
Received date: 2003-03-31
Revised date: 2003-05-08
Online published: 2003-10-20
The components and its isotopes are controlled not only by source type, source maturity and formation process of natural gas, but also by other effect such as diffusion after pool formation. The diffusion influence on gas is bigger especially in shallow buried gas pool. Dawanqi oilfield is a secondary reservoir formed through gas diffusion, which is an example in much extreme condition. The buried depth of Dawanqi oilfield is less than 600m, with solution gas much “wetter” in shallow layer, with drycoefficient much lower in shallow layer and much higher in deep layer, and with methane carbon isotope heavier in shallow layer and lighter in deep layer. Based on the calculation on gas diffusive content of two examples of Dawanqi oilfield and Yangtake gas condensate field, gas diffusion has very obvious effect on the gas pool which was buried shallowly and formed early. According to the condensate oil content of the discovered gas condensate reservoirs, it could be get that Dawanqi oilfield was formed with about（308～878）×108m3 gas being diffused.
Key words： Gas components; Gas carbon isotopes; Gas diffusion; Dawanqi oilfield.
ZHAO Meng-jun, SONG Yan, LIU Shao-bo, QIN Sheng-fei . THE DIFFUSION INFLUENCE ON GAS POOL: DAWANQIOILFIELD AS AN EXAMPLE[J]. Natural Gas Geoscience, 2003 , 14(5) : 393 -397 . DOI: 10.11764/j.issn.1672-1926.2003.05.393
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