逆断层对致密岩石构造裂缝发育的约束控制
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摘要
致密岩石(如火山岩和碳酸盐岩)可广泛发育构造裂缝,这类致密岩石的构造裂缝数值建模是构造裂缝地震解释、地震反演和油藏数值模拟的基础.我国西北各盆地普遍发育逆断层,通过在新疆巴楚地区微波塔逆断层和一间房逆断层分别布置实测剖面对野外测量的构造裂缝面密度进行定量分析,发现受逆断层控制的裂缝面密度与逆断层面的曲率呈线性关系;裂缝面密度与地层层面的曲率亦呈线性关系;发现距断裂越远裂缝面密度越低,并存在一个裂缝密度骤减的范围,这个范围内为"断裂控制裂缝带",这个"断裂控制裂缝带"可能与断裂的性质、规模和断距等因素密切相关,这个带的认识为构造裂缝的地震解释、地震反演和油藏数值模拟提供了重要参数.
Structure fracture can widely develop in the compacted rocks (volcanic rocks and carbonate rocks etc.).The numerical modeling of structure fracture in such compacted rocks is the foundation of seismic interpretation,seismic inversion and numerical reservoir simulation. Reverse faults are very common geological structures in the basins of northwest China.Based on the research of two reverse fault profiles in Bachu,Xinjiang,we find that the relationship between the fracture density controlled by reverse fault and the curvature of the fault plane is linear.The results also indicate that the fracture density is linearly related to the curvature of formation.And the fracture density decreases as the distance from the reverse fault increases. There is a damage region where the fracture density decreases sharply,and this region is a fracture zone controlled by reverse fault.This region is closely related to the mechanics,scale and displacement of the reverse fault.The recognition of this region provides an important parameter for seismic interpretation,seismic inversion and numerical reservoir simulation.
引文
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