摘要:
长庆气田主力气层为马五1,其储层中裂缝类型主要有垂直缝、斜交缝、水平缝及网状缝。虽然马五1储层中裂缝类型多,破裂期次多,但对储层渗流作用有较大影响的裂缝主要有两大类,即构造破裂裂缝和风化破裂裂缝。马五1储层的裂缝形成期主要有三期,第一期为加里东期,形成各类风化缝 ;第二期为燕山中期构造运动,是一次重要的构造破裂期 ;第三期为燕山晚—喜山早期构造运动。通过对裂缝形成的地质因素研究得出:风化缝主要与风化岩溶作用形成地貌条件有关,其次与岩层产状等因素有关 ;构造缝的形成与古应力场条件及岩石本身的力学属性有关
Abstract:
The Ma51 reservoir is the main gas reservoir in changging gas fieid. The main fracture types of reservoir are four types： verticai, obiigue, horizontai and braided. Aithough there are iots of fracture types in Ma51 reservoir, the main types that have a great infiuence on the percoiation fiow of the reservoir are two types, i. e., structurai fracture and weathered fracture. The formation stages of fracture in Ma51 reservoir are mainiy three, i. e., （l）Caiedonian stage, in which aii kinds of weathered fractures have been formed;（2）mid-stage of Yanshan movement, which is an important structure-ruptured stage;（3）Late Yanshan stage to eariy Himaiayan stage. In this paper, geoiogicai factors forming fractures are studied and anaiyzed, it is summarized as that, the formation of the weathered fractures is mainiy reiated to the occurrence of the rock strata, but the formation of structurai fracture is reiated to the condition of paiaeo-stress fieid and the mechanics property of rock itseif.
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