论文部分内容阅读
针对沾化凹陷罗家地区泥页岩进行岩石物理建模,在Backus平均理论中引入粘土矿物压实指数,考虑粘土定向排列引起的各向异性,由Chapman多尺度理论考虑裂缝系统引起的各向异性。根据储层物性特征,以水平缝为主控因素开发基于模型的反演算法,计算裂缝密度和各向异性参数。结果表明,反演的水平裂缝密度与岩心实测的水平渗透率有很好的正相关性,说明裂缝密度可作为渗透率的有效指示参数,同时也表明研究层段泥页岩的裂缝密度与粘土和石英等陆源碎屑含量呈负相关,而与碳酸盐岩含量呈正相关。同时,裂缝的存在使得纵波各向异性大于横波各向异性,裂缝密度与纵波各向异性参数呈明显正相关,而粘土含量与横波各向异性具有明显正相关性。这充分证明了岩石物理建模方法与裂缝反演技术的有效性。
According to the petrophysical modeling of shale in Luojia area of Zhanhua sag, the compaction index of clay minerals is introduced into the average theory of Backus. Considering the anisotropy caused by the directional arrangement of clay, the fractal dimension opposite sex. According to the physical property of the reservoir, a model-based inversion algorithm was developed based on the horizontal seam as the main control factor, and the crack density and anisotropy parameters were calculated. The results show that there is a good positive correlation between the horizontal fracture density and the horizontal permeability measured by the core, which shows that the fracture density can be used as an effective indicator of permeability. It also shows that the fracture density of clay shale And quartz and other terrestrial debris negative correlation, but with the carbonate content was positively correlated. At the same time, the existence of cracks makes the longitudinal anisotropy greater than the transverse anisotropy, and the fracture density has a positive correlation with the longitudinal anisotropy parameters. However, the clay content has obvious positive correlation with the shear wave anisotropy. This fully proves the effectiveness of rock physics modeling methods and fracture inversion techniques.