辽河油田东部凹陷玄武岩测井特征分析

摘要

针对辽河油田东部凹陷地区复杂火成岩岩性中玄武岩的测井特征，根据东部凹陷的测井数据及取芯段的薄片识别，共找到4种不同类型的玄武岩地层，分两组进行对比分析。第一组：气孔玄武岩、角砾化玄武岩；第二组：玄武岩、含油水层的玄武岩。利用玄武岩地层对应数据制作测井响应统计表，对比不同类型测井参数的差别制作交会图，得到角砾化玄武岩相对气孔玄武岩有较高的自然电位值，含油水层的玄武岩相对玄武岩有较高自然伽马值及中子值等特征。分析原因为气孔玄武岩及角砾化玄武岩孔隙裂缝发育，密度较低，黏土矿物充填角砾化玄武岩孔隙使自然电位值相对较高；含油水层的玄武岩中大量氢元素使中子值及自然伽马值相对玄武岩有所增加。%Aiming at the logging characteristics of basalt in complex lithology of igneous rocks in the eastern depression of Liaohe Oilfield,the authors found four different types of basalt strata according to the logging data of the eastern depression and identification of the slides of the coring section .The basalts have been divided into two groups to contrast.The first group:stomatal basalt and breccia basathe second group:basalt and oil-water bear-ing basalt.Using basalt stratigraphic data to make logging responsive statistics,and compare the difference of the various kinds of logging parameters and make cross plot,it is concluded that the breccia basalt has higher SP value contrast with stomatal basalt,and oil-water bearing basalt has higher GR and CNL values contrast with basalt.The reasons are that the fractures developed well in stomatal basalt and breccia basalt with low density,and the clay minerals filled into the fractures in breccia basalt leading to high SP value;and the H element in oil-water bearing basalt leading to high GR and CNL values.