高分辨率层序地层学在濮城油田西区沙二上亚段2+3砂组末端扇沉积体系中的应用(英文)

APPLICATION OF HIGH-RESOLUTION SEQUENCE STRATIGRAPHY TO A TERMINAL FAN SYSTEM,LAYERS 2 AND 3 OF THE UPPER SECOND MEMBER OF SHAHEJIE FORMATION,PUCHENG OILFIELD

为提高研究区储层描述和剩余油预测的精度,综合运用高分辨率层序地层学理论方法与技术,以岩芯、测井资料为基础,对濮城油田西区沙二上亚段2+3砂组进行了高分辨率精细层序划分,运用基准面旋回原理,将沙二上亚段2+3砂组划分为一个中期旋回,作为等时地层格架,并且进一步进行了短期旋回的识别,作为等时地层对比单元。最终将沙二上亚段2砂组分为7个小层,3砂组分为9个小层,并在全区建立了高分辨率层序地层格架。通过单井岩芯观察和描述,对研究区内各砂组砂体和沉积微相进行了详细研究,最终建立了濮城油田西区沙二上亚段2+3砂组的沉积模式,认为该地区为具有恒定物源供给的细粒末端扇沉积体系,而非前人所认为的辫状三角洲沉积。研究区亚相类型主要为末端扇中部亚相,中部亚相又分为分流河道、泥滩、近水道漫溢和远水道漫溢4个微相。

To enhance the resolution of reservoir recognition and determine the remaining oil in the Pucheng Oilfield,Puyang city of Henan province,this study was conducted based on comprehensive application of high-resolution sequence stratigraphy in combination with lithologic and electrical logging data.Higher baselevel cycles were recognized as an intermediate baselevel cycle and 12 short baselevel cycles,with which the Layer 2 of the upper second member of Shahejie Formation can be divided into 7 sublayers,and the Layer 3 into 9 sublayers;and the regional isochronous stratigraphic framework was established with precise correlation of sequence.A sedimentary system of marine terminal fan(not of braided delta origin)was recognized composed of mainly middle-fan subfacies which can be further divided into four microfacies,including distributary channel,mudflat,proximal overbank,and distal overbank.