综合预测大港油田C区中生代潜山油藏裂缝发育特征

Comprehensive prediction of the characteristics of the Mesozoic buried hill oil reservoir fracture development in block C of Dagang Oilfield

裂缝的准确描述和预测是裂缝型储集层有效评价的关键。大港油田C区中生代潜山油藏受构造应力场影响,同时由于后期新生代的构造断裂运动对中生代地层的改造作用,电阻率较高的硬地层中裂缝普遍发育。利用FMI成像测井及岩心裂缝观察等多项技术资料,分析裂缝类型、产状及发育密度等特征,并在此基础上开展蚂蚁追踪裂缝识别,通过多项技术数据综合应用识别出了各级裂缝数据,范围从厘米级到百米级,并总结出裂缝分布规律。研究认为C区主要以高导缝发育为主,且在距离主断层较近的区域裂缝更加发育,其走向与主断层一致。落实研究区的裂缝分布特征对后期油藏产能评价、储量评价和储集层压裂及酸化等都具有重要的指导意义。

Accurate description and prediction of cracks is the key to effective evaluation of fractured reservoirs.The Mesozoic buried hill oil reservoir in block C of Dagang Oilfield is affected by tectonic stress field.At the same time,the Mesozoic strata are reformed due to the tectonic faulting movement of the late Cenozoic.Cracks are widely developed in hard strata with high resistivity.The characteristics of fracture type,occurrence and development density were analyzed by using a number of technical data,such as FMI imaging logging and core fracture observation.On the basis of this,the identification of ant tracking cracks is carried out.Through the comprehensive application of a number of technical data,the fracture data at all levels have been identified.The range is from centimeter to 100-meter,the regularities of fracture distribution are summarized.It is considered that the main development of block C is high conductivity fracture.And in the region of the main fault,the fracture is more developed,and its strike is consistent with the main fault.It is of great guiding significance to carry out the characteristics of the fracture distribution in the study area for the later reservoir productivity evaluation,reserve evaluation and reservoir fracturing and acidizing.