大庆石油地质与开发

2015, v.34;No.167(01) 36-41

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延长油田三叠系长8、长6油层组沉积特征及储集性能
SEDIMENTARY CHARACTERISTICS AND RESERVOIR PROPERTIES OF TRIASSIC OIL GROUPS CHANG 8 AND CHANG 6 IN YANGCHANG OILFIELD

师清高,龚建涛,秦志成,刘高红,苏占德
SHI Qinggao,GONG Jiantao,QIN Zhicheng,LIU Gaohong,SU Zhande

摘要(Abstract):

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,electrofacies 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 subfacies:underwater inter-distributary channel,subsea natural barrier,subaqueous crevasse splay,inter-distributary depositional microfacieses.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 shrank,the water became shallow and sandbodies of underwater inter-distributary channel obviously prograded to the lake basin center with the maximum distribution area.There are differences in the reservoir properties for the sedimentary microfacieses:the physical properties 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 explorationary targets.

关键词(KeyWords): 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;sedimentary microfacies;reservoir property;favorable explorationary target

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作者(Author): 师清高,龚建涛,秦志成,刘高红,苏占德
SHI Qinggao,GONG Jiantao,QIN Zhicheng,LIU Gaohong,SU Zhande

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