大庆长垣某区块沉积岩石微相识别方法

Identification Method of Sedimentary Rock Micro-facies of Block in Daqing Oilfield

基于常规测井资料地质信息丰富、分辨率高、纵向连续性强等特点,分析某区块所包含的3种沉积微相曲线特征,提取了光滑度、迂曲度、微电极幅度差、变差方差根、曲线重心、斜率等反映各测井曲线形态和幅度的特征参数,利用逐步判别法建立了沉积微相判别模型;在充分考虑储层"四性"关系影响下,建立基于沉积微相的岩相识别三角形图版。沉积岩石微相识别符合率达到85%以上,为储层参数精确求取及水淹等级精准判别创造了有利条件。

Conventional logging data are characterized by rich geological information,high resolution,and vertical continuity.Based on that,the logging characteristics of the three sedimentary microfacies in a block were analyzed and some parameters such as smoothness,tortuosity,microelectrode amplitude difference,variance variance root,curve center of gravity and slope were obtained,these parameters can reflect the shape and amplitude of each curve.With the help of them,a discriminant model of sedimentary microfacies was established by stepwise discriminant method.Moreover,a lithofacies identification triangular plate based on sedimentary microfacies was established with considering the＂four characteristics＂of reservoirs.The result show that the coincidence rate of logging interpretation in sedimentary rock microfacies reaches more than 85%,which has created favorable conditions for accurate determination of reservoir parameters and accurate identification of flooding grade.