Abstract:

The intrusion of magma in a sedimentary basin can lead to the change of the geothermal history of the basin, and the huge heat energy of the magma can accelerate the maturation of the organic matters and influence the generation and preservation of oil and gas. A thermal modeling of the sheet magma intrusive sutloonlusions: (1) The cooling rate of the intrusive body is very quick, usually within 1Ma; (2) The superheated temperature histories of the host rocks which are equi-distant from the intrusive body are almost the same, whereas the temperature ofthe magma only influences the magnitude of the superheated temperature of the host rocks and does not influence the velocity of heat transfer; (3) The influence on the kerogen maturity of the host rocks are roughly the same over and belowine anefect zone is limited, usually about twice the thickness of the intrusive body. After a study, the thermal evolution patterns of the source rocks which are effected by the magmation are divided into three types, they are near、middle and far thermal source kitchen sub-patterns, and the classification principles and methods of the sub-patterns are also presented.

Key words: suligemiao gas-field, gas zone identification, well logging interpretation