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为明确碳酸盐岩潜山不同级别构造裂缝的分布规律,观察并统计了渤海湾盆地富台油田奥陶系碳酸盐岩储层岩心裂缝特征,以裂缝开度和流体在裂缝中流态为依据将富台潜山裂缝划分为3个级别,并应用数值模拟方法计算出各层位不同级别构造裂缝分布情况。研究结果表明,富台潜山奥陶系储层构造裂缝可以划分为大裂缝(开度大于1.0mm)、中裂缝(开度为0.5~1.0mm)、小裂缝(开度小于0.5mm)。不同级别裂缝分布主要受到构造部位、断层和岩性控制,数值模拟结果显示大裂缝主要在八陡组、上马家沟组和下马家沟组的背斜核部及断层附近发育,中裂缝主要在背斜翼部及冶里组—亮甲山组发育,小裂缝在研究区发育较少,零星分布于八陡组和上马家沟组。
In order to clarify the distribution regularities of different levels of structural fractures in carbonate buried hills, the core fracture characteristics of Ordovician carbonate reservoirs in Futai Oilfield, Bohai Bay Basin were observed and calculated. The fracture opening and fluid flow in fractures were Based on the Fuqiu buried hill fractures are divided into three levels, and numerical simulation method to calculate the distribution of the various levels of structural fractures. The results show that the structural fractures of Ordovician reservoirs in Fuqiu buried hill can be divided into large fractures (opening larger than 1.0mm), middle fractures (opening 0.5 ~ 1.0mm) and small fractures (opening smaller than 0.5mm). The fracture distributions at different levels are mainly controlled by tectonic positions, faults and lithologies. The numerical simulation results show that the major fractures are mainly developed in the rifts in the Upper Member of the Badachu Formation, the Upper Majiagou Formation and the Lower Majiagou Formation, and the faults are mainly located near the core and faults. The anticlinal wing and the Yeli Formation - Liangjishan Formation developed with small fractures developed less in the study area and sporadically distributed in the Badu Formation and Shangjiajiagou Formation.