砂质辫状河储层隔夹层分布模式及其对边底水运移的影响——以南苏丹P油田Fal块为例

发布时间：2018-04-13 22:11

本文选题：辫状河 + 隔夹层　；参考：《油气地质与采收率》2017年02期

【摘要】：基于野外露头与南苏丹P油田Fal块砂质辫状河储层的地质特征对比,选取山西省大同市吴官屯砂质辫状河露头剖面为原始模型,通过实测地质剖面记录的方法对其进行详细解剖,明确砂质辫状河储层中隔夹层的成因类型,建立隔夹层分布模式,并以此为指导分别从隔层和夹层的角度,对Fal块边底水油藏中水体的运移规律进行研究。结果表明,砂质辫状河储层中发育河底滞留泥砾沉积、废弃河道细粒沉积、泛滥平原细粒沉积、落淤披覆泥沉积和侧积泥沉积共5种成因类型的隔夹层。以单期砂质辫状河河道为基本单元,建立隔夹层分布模式,即废弃河道细粒沉积与河道砂体互相叠置;泛滥平原细粒沉积向河道外侧不断延伸;落淤披覆泥、侧积泥和河底滞留泥砾沉积受后期冲刷改造充填于河道砂体内部。基于建立的砂质辫状河储层隔夹层分布模式,指出Fal块砂质辫状河储层中以泛滥平原细粒沉积为主的隔层分布是影响底水突进程度的主要因素,夹层发育频率越高对边水的遮挡作用越强。
[Abstract]:Based on the comparison between outcrop in the field and sand braided river reservoir in Fal block in South Sudan P oilfield, the protruding profile of the sandy braided river in Wuguantun, Datong City, Shanxi Province is selected as the original model.It is anatomized in detail by the method of measured geological section record, the genetic type of intercalation in sandy braided river reservoir is determined, and the distribution pattern of separated interlayer is established, which is used as a guide from the angle of barrier layer and intercalation layer, respectively.The migration law of water body in Fal block edge and bottom water reservoir is studied.The results show that there are five genetic types of intercalation in sandy braided river reservoir, such as sediment retention in river bottom, fine grain deposition in abandoned channel, fine grain deposition in flood plain, drape mud deposition and lateral mud deposit.Taking the single-stage sandy braided river channel as the basic unit, the intercalation distribution model is established, that is, the fine grain deposition of the abandoned channel and the sand body of the channel superposition each other; the fine grain deposition of the flood plain extends to the outer side of the channel; the silt falls and draps over the mud,The lateral mud deposit and the sediment retention in the river bottom are filled in the channel sand body by the later scour modification.Based on the intercalation distribution model of sandy braided river reservoir, it is pointed out that the distribution of sand braided river reservoir in Fal block is mainly composed of fine grain deposition in flood plain.The higher the development frequency of intercalation, the stronger the blocking effect of edge water.
【作者单位】：中国石油勘探开发研究院;中国地质大学(北京);中国石油大港油田分公司勘探开发研究院;
【基金】：中国石油科技重大专项“南苏丹3/7区大型层状砂岩油藏控水稳油综合调整研究”(2016D-4401)
【分类号】：P618.13

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