ORDOVICIAN UNDER-SALT RESERVOIRS AND FORMING CONDITIONS OF GAS POOLS IN EASTERN ORDOS BASIN
Received date: 2006-11-28
Revised date: 2007-01-30
Online published: 2008-06-20
O1m75,O1m95,the upper O1m4 member, O1m12 and O1m22 are the five reservoirs located below the salt of the Ordovician Majiagou formation in eastern Ordos basin. The porosity o2f these reservoirsis generally low, but they have a relatively high permeability. Observation from the under-salt exploration wells demonstrates that the under-salt dolomite take on an obvious phenomenon of hydrocarbon generation and accumulation. Carbonaceous asphalt fills the dissolved reservoirs, and there are excellent source-reservoir-seal association and various types of traps. Having these geologic conditions of forming under-salt gas pools, the under-salt dolomite is a new favorable gas exploration area.
Key words： Eastern Ordos basin; Under-salt; Reservoir; Hydrocarbon generation; Trap
XIA Ming-jun;ZHENG Cong-bin;DAI Jin-xing;ZOU Cai-neng;WANG Zecheng;WANG Lan-ping . ORDOVICIAN UNDER-SALT RESERVOIRS AND FORMING CONDITIONS OF GAS POOLS IN EASTERN ORDOS BASIN[J]. Natural Gas Geoscience, 2007 , 18(2) : 204 -208 . DOI: 10.11764/j.issn.1672-1926.2007.02.204
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