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根据岩石学特征及层序特征,分析了牛东地区石炭系火山岩相类型及其测井响应特征。牛东地区石炭系火山岩可以分为溢流相、爆发相、空落堆积相、火山沉积相,测井曲线中能较好地区分这4种岩相的是自然伽马(GR)、密度(DEN)测井曲线,火山沉积相对电阻率测井(Rt)也有较好的反应。火山岩储集空间分为两大类:一类为孔洞类,主要有纳沸石未完全充填的气孔、杏仁体溶蚀孔、粘土矿物及葡萄石杏仁收缩孔、基质溶孔;另一类为裂缝类,主要为未被钠沸石及绿泥石完全充填的火山岩自碎缝、收缩缝、构造缝以及各类缝充填物溶蚀形成溶蚀缝。通过研究,岩浆的物质成分、喷溢相带以及后期改造作用是火山岩优质储层形成的主要控制因素。粘度大、流动性差、气体逸散较慢的中性岩浆形成的安山岩是最佳储层,而喷溢旋回末期是形成杏仁体、气孔及自碎缝的有利时期,喷溢旋回间歇期的风化淋滤为各类溶蚀孔形成提供了条件。火山岩储集空间的成因机理对寻找火山岩储层具有重要意义。
Based on the petrologic characteristics and sequence characteristics, the types of Carboniferous volcanic rocks in the Cathay and the logging response characteristics are analyzed. Carboniferous volcanic rocks in Catouy region can be divided into overflow phase, eruption phase, empty falling sedimentary facies and volcanic sedimentary facies. The well logging curves which can distinguish these four facies well are natural gamma (GR), density DEN) well logs and volcanic sedimentary relative resistivity logs (Rt). The volcanic reservoirs are divided into two major types: the first one is pores, the pores are mainly filled with nano-zeolite, almond dissolution pores, clay minerals and grape stone almond shrinkage pores and matrix dissolved pores; the other is cracks , Mainly because volcanic rocks that have not been fully filled with sodium zeolite and chlorite have been dissolved from broken fractures, shrinkage cracks, structural cracks and various types of seam fillings to form dissolution cracks. Through research, the magma’s material composition, spouting facies belt and the later remoulding are the main controlling factors for the formation of volcanic high-quality reservoirs. Andesite formed by neutral magma with high viscosity, poor fluidity and slower gas evolution is the best reservoir, while the last period of jet-lapping is the favorable period of forming almonds, stomata and self-fracturing, Leaching provided the conditions for the formation of various types of dissolution pores. The genesis mechanism of volcanic reservoirs is of great significance for finding volcanic reservoirs.