永安油田沉积微相及储层特征研究

Study on sedimentary microfacies and reservoir characteristics of Yong'an Oilfield

永安油田地质条件复杂,断层发育,断块破碎,油藏类型受断层影响较大,主要为断层遮挡的层状构造油气藏,目前处于中高含水开发后期,为了改善油田开发效果,开展了沉积相及砂体分布规律研究,进行了储层特征分析与有利地区的预测。通过岩心观察、测井相以及砂体平面和剖面上形态分析,建立了各区、各段和各砂组沉积相图版和单井微相模式。应用纵、横向连井剖面相序列分析,进一步认识了沉积演化、砂层展布和储层物性变化规律。

The geological conditions of Yong＇an Oilfield is very complex,fault development,and fault block broken.Reservoir type in Yong＇an district is affected mainly by faults.And the main reservoir type is focused on layered structural reservoir,which is screened by fault.At present,Yong＇an Oilfield has entered the developing later stage of high water-cut.Sedimentary facies and sandbody distribution rules,especially analysis of reservior characteristics,and prediction of favorable region have been studied to improve development effects.Sedimentary facies charts and single well microfacies patterns for each area,each member,and each sand series were established by mass core observation,electrofacies,and morphological analysis in sand-body plane and section.Facies sequence analysis of longitudinal and horizontal well section was applied to recognize sedimentary evolution,sandbody distribution and changing law of reservoir physical properties.