论文详情
受郯庐断裂的影响,新生代以来,辽河盆地东部凹陷间断发生了6次构造运动,且均伴随有强度不等的火山喷发活动,火成岩广泛发育。以6口不同的井为例,揭示了东部凹陷内中基性火成岩、致密玄武岩、气孔玄武岩、玄武质火山碎屑岩、粗面岩、粗面质火山碎屑岩和辉绿岩的测井曲线组合特征。选取典型的岩性数据段总结出了该地区火成岩性测井响应特征,并制作了一套适合该地区的岩性识别图版。其中，自然伽马和深侧向电阻率交会图能很好地识别辉绿岩,中子和密度交会图可以很好地区分玄武岩类;利用最小二乘支持向量机建立了火成岩岩性识别模型,识别结果与岩心、岩屑薄片定名对比,符合率较高。交会图版和最小二乘支持向量机结合运用,很好地解决了研究区岩性识别的问题,为进一步开展油气藏的解释奠定了基础。
Since the Cenozoic,because of the influence of the Tanlu Fault,six tectonic movements have occurred in the Eastern Depression of Liaohe Basin,which were accompanied by volcanic activity with different intensity; so igneous rock is widely developed.Based on six wells,the characteristics of log combination of the intermediate and basic igneous rock are analyzed,including tight basalt,stomatal basalt,basaltic volcanic clastic rock,trachyte,trachytic volcanic clastic rock and diabase.Selecting typical lithology data,the characteristics of igneous lithology logging response in this area are summarized; and a set of suitable lithology identification chart is established for the area.The crossplot of natural gamma versus deep lateral resistivity can well identify diabase,and the crossplot of neutron and density can well distinguish basalts.Using least squares support vector machine (LS-SVM),the igneous rock lithology identification model is constructed.Compared with core analysis and cutting description,the accuracy rate of the identification result reaches up to 79.5%.The combination of crossplot and LS-SVM well solves the problem of lithology identification and provides assistance for further interpretation of oil and gas reservoirs.