论文部分内容阅读
塔中Ⅰ号断裂带O2 + 3 灰岩储层裂缝可分为构造裂缝和非构造裂缝两大类。根据裂缝交切关系、方解石包裹体均一温度和岩石Kaiser实验结果 ,认为O2 + 3 灰岩遭受 3次构造运动 ,形成了相应的 3期构造裂缝。晚加里东 -早海西期 ,在静压力作用下 ,沿O2 + 3 灰岩层面形成平行层面的成岩裂缝 ,之后 ,在NE -SW向构造力作用下 ,产生一系列垂直层面的共轭剪切缝、高角度缝合线以及随应力积聚而形成的纵张、横张缝等 ,此期裂缝均为方解石充填 ;晚海西期 ,构造运动将前期裂缝扩大 ,并产生新的剪切裂缝 ,后期相对宁静 ,裂缝被半透明状方解石充填 ;喜山期再次受到构造运动影响 ,形成了规模不大、方向性好、基本未被充填的直立构造剪切缝 ,对油气的运聚有重要作用。
The fractures of O2 + 3 limestone reservoirs in Tazhong Ⅰ fracture zone can be divided into two categories: structural fractures and non-structural fractures. According to the relationship of fracture intercept, the homogenization temperature of calcite inclusions and the rock Kaiser experimental results, it is considered that the O2 + 3 limestone suffered three tectonic movements and formed the corresponding third-stage structural fractures. In the late Caledonian-Early Hercynian period, a parallel-diagenetic diagenetic fracture was formed along the O2 + 3 limestone under hydrostatic pressure. Afterwards, a series of vertical-plane conjugate shear Kerf and high-angle suture, as well as the longitudinal and transverse slits formed by the stress accumulation. During this period, the calculi were filled with calcite. In the late Hercynian, the tectonic movement expanded the early cracks and created new shear cracks, The later period is relatively quiet, and the fractures are filled with translucent calcite. Once again, the Himalayan period was affected by the tectonic movement, forming an upright tectonic shear gap of small size, good orientation and almost no filling, which plays an important role in the migration and accumulation of oil and gas .