成都洛带气田蓬莱镇组储层特征

RESERVOIR CHARACTERS OF PONGLAIZHEN FORMATION\= IN LUODAI GASFIELD,CHENGDU

洛带气田蓬莱镇组浅层气藏的储层孔隙度、渗透率及压缩规律的实验研究表明，随着围限压力增加，孔隙度及渗透率相应降低，当围限压力增加到１０ＭＰａ时，测得的孔隙度、渗透率与常温、常压下测定的孔隙度、渗透率相比最大可分别下降７３９和８０。储层孔隙度的变化与钙质、硬石膏的含量有密切关系。据岩芯薄片资料建立了相应的数学关系式。结构参数描述说明，该气藏的ⅠⅢ类储层喉道半径主峰分布在０４～４０μｍ喉道半径之间，而９０以上的累积渗透率贡献则分布在喉道半径为１０μｍ以上。

Experiments were made on the porosity,permeability and the compaction regularity of the reservoirs of Ponglaizhen shallow gas pools in Luodai Gasfields.The results indicate that the porosity and permeability decreased with the increasing of confining pressure.When the confining pressure increases to 10 MPa,the porosity and permeability would decrease maximally to 7.390/0 and 800/0 respectively as compared with those measured at normal temperature and pressure.The variation of reservoir porosity is closely related to the contents of calcium and anhydrite.A mathematical relational expression is established according to core data.The description of textural parameters suggest that,the main peak of throat radiuses of type reservoirs of the gas pools are distributed between 0.44.0 m;more than \{900/0\} of the cumulated permeability are distributed in those the throat radiuses greater than 1.0 m.This shows that large throat radius dominats gas mgration.\;