GAS FORMING MECHANISMS AND ACCUMULATION MODELS OF THE XUJIAHE FORMATION IN HEBAOCHANG REGION, THE SOUTH OF SICHUAN BASIN
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摘要: 蜀南河包场地区上三叠统须家河组气藏为自生自储的含油气系统。须二、须四、须六段砂岩厚度较大、分布广,以低孔、低渗储层为主。根据储层毛细管压力曲线估算,天然气长距离的二次运移需要克服的毛细管阻力为2.5~3.5 MPa,相应的临界气柱高度为150~300 m。须家河组的区域构造平缓,储层天然气聚集成藏的驱动方式主要受储层砂体分布范围和储层物性控制。优质储层的毛细管阻力虽然相对较低,但是分布范围较小,多为透镜状或条带状。天然气二次运移以气体膨胀驱动为主,近距离运聚成藏。Abstract: The Upper Triassic Xujiahe Formation is a reservoir forming system with self-generation and self-storage.In Hebaochang region of the Sichuan Basin,the thickness and range of sand rocks is relatetively larger in the Second Member,Fourth Member and Sixth Member of the Xujiahe Formation.However,the reservoir rock mainly has low porosity and low permeability.According to the capillary pressure curve,the capi-llary resistance of the secondary migration of gas is about 2.5 MPa to 3.5 MPa.Heights of gas column are between 150 m and 300 m.Because of the gentle regional structure,gas accumations are mainly controlled by the sand body distribution and reservoir properties.Although the excellent reservoir rock has less capillary resistance,the distribution area is relatively small,and usually belongs to lenticular or strips sand body.The secondary migration of gas depends mainly on the gas expansion and the gas accumulates in nearby regions.
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Key words:
- gas migration /
- accumulation model /
- Xujiahe Formation /
- Hebaochang region /
- Sichuan Basin
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