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通过对研究区现有岩心的观察描述,利用钻井、试油等资料,详细探讨了十屋油田营城组储层裂缝特征,并从构造运动和现今地应力2个方面对裂缝的有效性进行了分析。结果表明,研究区裂缝以高角度斜交缝和直劈缝为主,力学性质表现为剪性缝和扭张缝;裂缝充填程度主要为半充填,主要充填方解石和泥质;虽然存在多组裂缝方向,但以北东向、近南北向裂缝占优势,其次为北西和北北东向裂缝;主要在营城组末期和登娄库组末期北西向构造应力作用下形成裂缝。在现今地应力作用下,东西向裂缝有效程度高,成为影响十屋地区开发布井的重要裂缝组系。
Based on the observation and description of the existing cores in the study area and using the data of drilling and oil testing, the characteristics of the fractures of the Yingcheng Formation reservoirs in the Shiwu Oilfield are discussed in detail. The validity of the fractures is analyzed from two aspects of the tectonic movement and the present geostress Analysis. The results show that the fractures in the study area are mainly diagonal intersections and straight splits, and the mechanical properties are shear and twisting joints. The fracture filling degree is mainly semi-filled and mainly filled with calcite and shale. Although there are many groups But the northeastward and nearly north-southward fractures are dominant, followed by the northwest and north-north-eastward fractures. Cracks mainly form at the end of the Yingcheng Formation and northwesterly tectonic stress in the late Denglouku Formation. Under the current stress, the east-west fracture has a high degree of effectiveness and becomes an important fracture facies system that affects the well-development of the Shiwu area.