摘要
通过对旬邑地区15口井钻井资料的岩石类型、岩心特征、测井相特征等分析研究,明确长8、长6油层组的沉积相特征及储集性能。研究区的沉积相类型主要为三角洲前缘亚相,发育水下分流河道、水下天然堤、水下决口扇、分流间湾等沉积微相。长8组成藏期,湖盆整体处于缓慢沉降期,河道砂体规模中等;长6组成藏期,湖盆面积收缩,水体变浅,水下分流河道砂体向湖盆中心推进范围明显,分布面积最大。不同沉积微相的储集性能存在差异:水下分流河道砂体的储层物性最好,是主力储集砂体;水下天然堤、水下决口扇储层物性中等;分流间湾储层物性较差。研究成果为有利勘探目标优选奠定了基础。
Through the analyses and studies on the rock types, core features, eleetrofacies characteristics etc. for the drilled fifteen wells in Xunyi area, the sedimentary features and reservoir properties are made clear for Oil Groups Chang 8 and Chang 6. The chief type of sedimentary facies can be subdivided into front-delta subfaeies： underwater inter-distributary channel, subsea natural barrier, subaqueous crevasse splay, inter-distributary deposi- tional mierofaeieses. The whole lake basin was slowly setting and channel sandbody scale was medium in Oil Group Chang 8 accumulation period; for Group Chang 6, the lake area was shrunk, the water became shallow and sand- bodies of underwater inter-distributary channel obviously prograded to the lake basin center with the maximum dis- tribution area. There are differences in the reservoir properties for the sedimentary microfacieses ： the physical prop- erties of the underwater inter-distributary channel sandbodies are the best, which are the primary sandbodies ; those of the subsea natural barrier and subaqueous crevasse splay are medium ; ones of the inter-distributary deposits are rather poorer. All the achievements have laid the basement for the optimization and choice of the favorable explora-tionary targets.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2015年第1期36-41,共6页
Petroleum Geology & Oilfield Development in Daqing
关键词
鄂尔多斯盆地
延长油田
旬邑地区
延长组
沉积相
沉积微相
储集性能
有利勘探目标
Ordos Basin
Yanchang Oilfield
Xunyi area
Yanchang Formation
sedimentary facies
sedimen-tary microfacies
reservoir property
favorable explorationary target
