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本文综合利用测井、地震、岩心描述与分析化验等多种资料,研究了牛心坨潜山太古界变质岩储层岩性特征与空间展布规律、岩性对储层的控制作用,研究结果有助于丰富和完善新型的基岩内幕油气成藏理论。工区变质岩岩性复杂、共分为三大类十五种,主要为花岗片麻岩、斜长片麻岩、斜长角闪岩、混合花岗岩、混合片麻岩、混合岩、碎裂岩与碎斑岩;对比显示本区变质岩古潜山带地层在垂向上从下至上大致可分为混合花岗岩带、混合花岗岩与混合岩带、片麻岩与角闪岩带、风化壳破碎带4个岩性组合带;变质岩在垂向上分为多个岩性段,由下向上为混合花岗岩—混合花岗岩与混合片麻岩—花岗(钾长)片麻岩—片麻岩与角闪岩—碎裂岩、片麻岩与风化壳,平面上呈现分区性。变质岩内幕层序为非均匀、非块状的,变质岩体为非块状体。构造作用、岩石类型和矿物种类对变质岩裂缝型储层起决定作用。
In this paper, lithology and spatial distribution regularity of Archean metamorphic reservoirs in Niuxintuo Buried Hill and the controlling effect of lithology on reservoirs are studied by comprehensively using various data such as logging, seismic, core description and analytical test, etc. The results contribute to the enrichment and improvement of new bedrock oil and gas accumulation theory. The metamorphic rocks in the work area are of complex lithology and are divided into 15 major types and 15 types, mainly including granitic gneiss, plagiogneiss, amphibolite, mixed granite, mixed gneiss, mixed rock, The comparison shows that the strata of the metamorphic rock buried hill in this area can be divided into mixed granite belt, mixed granite and mixed rock belt, gneiss and amphibolite belt in the vertical direction and crushed weathering crust With four lithologic assemblages. The metamorphic rocks are vertically divided into lithologic sections and are composed of mixed granite-mixed granite and mixed gneiss - granite (potash) gneiss-gneiss Amphibolite - rift, gneiss and weathering crust, showing zoning on the plane. The sequence of the metamorphic rock is non-uniform and non-massive, and the metamorphic rock is non-massive. Tectonics, rock types and mineral types play a decisive role in the metamorphic rock fractured reservoirs.