分汊与游荡型辫状河储层构型研究:以苏丹FN油田为例

发布时间：2018-04-14 22:09

本文选题：储层构型 + 辫状河　；参考：《地学前缘》2017年02期

【摘要】：辫状河储层构型研究对预测剩余油分布有重要作用,但目前国内外学者对辫状河储层构型的研究多停留在笼统的辫状河模式上,对不同类型辫状河的构型研究较少。本文在文献调研和露头观察的基础上,对分汊和游荡两种类型的辫状河分别进行研究。以苏丹FN油田为例,依据"层次约束,模式拟合和多维互动"的构型解剖思路,综合岩心和测井资料分别对分汊与游荡型两种辫状河进行构型单元解剖,从单一辫流带砂体厚度、隔夹层发育规模、心滩坝与辫状河道发育规模及关系、落淤层与沟道发育规模及模式等方面入手,分层次定量计算不同河型构型单元的发育规模,探讨不同规模构型要素对剩余油形成与分布的控制作用。研究发现分汊型辫状河单一辫流带砂体厚度小于游荡型辫状河,连片分布的隔层稳定性强于游荡型辫状河;分汊型及游荡型辫状河都广泛发育心滩坝、辫状河道等砂体,规模和形态类似;分汊型辫状河心滩坝被河道下切完全,内部发育落淤层与沟道沉积,两者分期孤立分布或同期切割分布;游荡型辫状河心滩坝内镶嵌着规模较小的辫状河道(沟道),落淤层较不发育。最终总结了构型界面渗流屏障在垂向上影响剩余油分布的5种模式,以及构型单元渗透性较差处如心滩坝边部、泥质(半)充填河道等易形成剩余油富集。
[Abstract]:The study on the configuration of braided river reservoir plays an important role in predicting the distribution of remaining oil. However, most of the researches on the configuration of braided river reservoir at home and abroad are focused on the general braided river model, but few on the configuration of different types of braided river.On the basis of literature investigation and outcrop observation, two types of braided rivers, branching and wandering, are studied in this paper.Taking the FN oilfield in Sudan as an example, according to the anatomical thinking of "hierarchical constraint, pattern fitting and multi-dimensional interaction", combined with core and logging data, two braided rivers of branching type and wandering type were dissected separately.Starting with the single braided belt sand body thickness, the scale of intercalation development, the development scale and relationship between Xintan dam and braided channel, and the development scale and model of silt fall and channel, the development scale of different river type configuration units is calculated quantitatively and hierarchically.The controlling effect of different scale configuration elements on the formation and distribution of residual oil is discussed.It is found that the thickness of single braided flow zone of branched braided river is smaller than that of wandering braided river, and the stability of the interlayer is stronger than that of wandering braided river, and both branched and wandering braided rivers have widely developed sand bodies such as Xintan dam and braided channel.The scale and shape of the braided braided river core bar are similar: the braided river core bar is completely cut down by the river and the silt layer and channel deposit are developed in the interior which are distributed in stages and isolated or cut simultaneously.The wandering braided river core dam is inlaid with a small braided channel (channel and silt layer).Finally, five models of the vertical influence of the structure interface seepage barrier on the distribution of remaining oil are summarized, and the residual oil enrichment is easy to be formed where the permeability of the configuration unit is poor, such as the edge of the core beach dam, the muddy (semi-filled) channel, and so on.
【作者单位】：中国石油勘探开发研究院;中国石油尼罗河公司;
【基金】：中国石油天然气集团公司重大专项“苏丹主力砂岩油田稳油控水及提高采收率技术研究与应用”(2011E-2507) 国家自然科学基金项目“湖盆滩坝砂体地质定量预测研究”(41572092)
【分类号】：P618.13

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