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对泌阳凹陷南部陡坡带核三上段岩石颜色、岩石类型、沉积构造、古生物标志、测井相等相标志的综合分析,从而对其沉积相类型及特征进行研究。研究认为,泌阳凹陷南部陡坡带核三上段沉积期发育扇三角洲、辫状河三角洲和湖泊3种沉积体系。扇三角洲及辫状河三角洲主要发育三角洲前缘和前三角洲2个亚相,缺失三角洲平原亚相。三角洲前缘亚相可进一步划分为水下分流河道、水下分流河道间、河口砂坝、远砂坝、席状砂等沉积微相。湖泊相沉积则以半深湖—深湖泥沉积为主。
A comprehensive analysis of rock color, rock type, sedimentary structure, palaeontological log and phase marker of well logging in the upper third of the steep slope belt in the southern Biyang depression was carried out to study the types and characteristics of sedimentary facies. The study suggests that there are three depositional systems of fan delta, braided delta and lake in the sedimentary period of the upper third of the core of the steep slope belt in southern Biyang depression. The fan delta and braided river delta mainly develop two subfacies of the delta front and the former delta, lacking the delta plain delta. The delta front subfacies can be further subdivided into sedimentary microfacies such as underwater distributary channel, underwater distributary channel, estuary sand bar, distal sand bar and sheet sand. The lacustrine sediments are mainly semi-deep lacustrine-lacustrine mud deposits.