对于断层发育的低渗断块型油气田,断层的封闭性是影响开发效果的重要因素之一.断层封闭性的好坏,对油气田制定开发和调整对策具有重要的意义.本文以我国东部整装断块型砂岩气田——WZ气田为例,开展了低渗断块砂岩气藏的断层封闭性研究.针对该气藏静、动态资料丰富的特点,采用岩性配置关系法、动态分析法等方法,分级别评价了WZ气田断层的封闭性.研究认为,气田的分块断层为典型的封闭断层,以块状特征为主的主块内部小断层表现为整体封闭性差的特征,且小断层封闭程度具有相对性和局部性的特点,小断层封闭性的好坏主要取决于断层两侧岩性及流体配置关系.并根据研究结果,提出了气田开发调整技术对策,为进入开发中后期的气田调整提供了依据.%For low permeability fault block oil and gas field, the fault sealing is one of the important factors which influence the development effect. The seal ability of gas field has a special significance in rnmaking development & adjustment countermeasures. Aimed at the fault block sandstone gas field――WZ rngas field in eastern our country,this paper carried out the fault sealing research of this low permeability gas field. By using the method of the lithology configuration relations arid dynamic analysis,this paper discussed the fault sealing of the different level faults in WZ gas field. Studies suggested that the block faults are typical closed faults,and the small faults in main block perform poorly sealing. The degree of small faults seal ability depends on both lithology configuration and fluid relation of the two sides of the faults. According to the results,this paper puts forward the development adjustment countermeasures for WZ gas field,and provides the basis for the development and adjustment in WZ gas field.
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