Abstract：Our targets are tight gas reservoirs of Upper Paleozoic located in the Jinxi flexural fold,eastern Ordos Basin. These reservoirs close to Zijinshan plutons were formed in sandstone and conglomerate deposited in braided river and meandering river delta plains. Based on previous research of Zijinshan plutons,we discuss in this paper seismic reflection characteristics of intrusive mass,Zijinshan pluton and pluton roles in structure and source rock formation,fracture,and migration, hydrocarbon accumulation for tight gas reservoirs. The following observations are obtained:①Zijinshan pluton activities control tectonic characteristics of the area. As the main bodies,Zijinshan pluton can be divided into three tectonic belts,Zijinshan tectonic zone,around-Zijinshan syncline zone, and gentle structure zone.A few favorable traps were formed in the gentle tectonic zone under regional stress,which provides favorable space for oil and gas reservoirs. ②The Zijinshan pluton intrusion accelerated the maturity of the source rocks and increased the total amount of hydrocarbon generation,which played an active role in the reservoir formation. ③A large number of faults and fissures were generated in the igneous rock periphery,constituted important channels for oil and gas upward migration,and created favorable conditions for secondary conventional natural gas formation in shallow Mesozoic.
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