【摘要】 综合分析录井、测井、地震、岩心与分析化验等资料,对大民屯凹陷中央构造带太古宇变质岩储层岩性类型、空间分布、岩性对储层的控制作用进行了研究。研究认为:本区太古宇变质岩岩性分为三大类18种,主要有混合花岗岩、混合片麻岩、混合岩、角闪斜长片麻岩、浅粒岩、角闪岩、变粒岩,夹丰富不均一的基性脉岩和碎裂岩。有效储层岩性为碎裂化混合花岗岩与碎裂化变粒岩、浅粒岩、片麻岩;变质岩在垂向上(由下至上)分为多个岩性段,从混合花岗岩至浅粒岩与风化壳,垂向上可进行类似于沉积岩层序的地层对比,岩性在平面上也呈现分区性。变质岩体在岩性上是不均一的、非均质的块体。矿物种类和岩石类型对研究区变质岩裂缝型储层起重要作用,碎裂化变粒岩、浅粒岩、混合花岗岩与片麻岩可作为优质储层。更多还原

【Abstract】 A comprehensive research on the Archean metamorphic buried-hill in the central area of Damintun depression was conducted on well log,seismic,core description and rock-mineral analysis.Based on the study,the metamorphic rocks are very complicated,including 3 kinds and 18 rock species,such as migmatitic granite, migmatitic gneiss, migmatite, amphibole plagiogneiss, leptite,amphibolite,granulite and rich inhomogeneous basic dike rock and cataclasite and so on;and the metamorphic sequence is composed of several belts of lithological combination,and the metamorphic rocks are composed by several petrological sections vertically(from down to top),including migmatitic granite section,migmatitic granite and migmatitic gneiss interbedded with amphibolite and dolerite section,migmatite and granulite section,leptite and gneiss section and crust of weathering.The petrology is also plane dividable.The metamorphic rock is a non-uniform massive body.The low porosity and low permeability reservoir of Archean metamorphic fractured reservoir is mainly controlled by petrology and mineralogy.The cataclastic granulite,leptite,migmatitic granite and gneiss could be the perfect reservoir.The study results help to detect the petrological,spatial distribution and influence of lithology on reservoir that will be beneficial for further petroleum production and exploration;also,the study will complete and enrich the theory of inner basement hydrocarbon accumulation.更多还原