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喇嘛甸油田PⅠ23沉积单元为辫状河沉积,主要发育辫状河道、心滩、河漫滩三种沉积微相,其中心滩砂体内部构型相对复杂,控制的剩余油较多。以4-4#站高浓度试验区储层为例,运用Mail提出的储层建筑结构界面分析方法,通过小井距井之间的连井剖面和测井曲线对比定义了6级界面。在沉积模式指导下得出了平面相组合模式,即平面以河道充填和心滩沉积为主。在明确心滩砂体沉积环境及形成机理基础上得出了沉积特征及识别方法,并对心滩内部构型进行了解剖,实现了垂积体追踪与预测。利用试验区内新钻井的测井解释结果,一方面完善了心滩砂体内部构型,另一方面新井解释的含油饱和度,水淹特征等信息直接揭示了高浓度聚合物对辫状河心滩的动用规律,位于心滩内部的新井解释结果表明,心滩中部水淹以高、中为主,而心滩两翼岩性夹层多、渗透性差,低、未水淹比例大,剩余油多。
PⅠ23 sedimentary unit of Lamadian oilfield is a braided river sedimentary. There are mainly three sedimentary microfacies of braided channel, heart beach and river floodplain. The internal structure of the center beach sand body is relatively complicated, and the residual oil controlled is more. Taking the high concentration test zone of 4-4 # station as an example, the method of interface analysis of reservoir building structure proposed by Mail is used to define a 6-level interface by comparing well-connecting well and well logging curve between well and well. Under the guidance of the sedimentary model, the plane-phase combination model is obtained, that is, the plane is dominated by channel filling and heart-beach deposition. On the basis of clarifying sedimentary environment and formation mechanism of heart-sand body, the sedimentary characteristics and identification methods are obtained. The anatomy of the heart-beach internal structure is anatomized, and the sediment tracking and prediction are realized. Using well log interpretation results of new drilling in the test area, the internal configuration of heart-sand sand body is improved. On the other hand, the information of oil saturation and water flooding explained by new well directly reveals the effect of high concentration polymer on braided river The interpretation of the new wells located inside the heart and beach shows that the flooding in the central part of the heart and the beach is dominated by high and medium flooding, and there are many lithologic intercalations, poor permeability, low flooding and large proportion of remaining flooding many.