分汊与游荡型辫状河隔夹层层次结构特征

发布时间：2019-07-04 13:05

【摘要】：前人对辫状河储层的研究往往笼统地将其作为一种储层类型,对不同类型辫状河储层研究较少。在文献调研和露头观察的基础上,以苏丹FN油田为例,按"层次约束"思路,参考Miall等关于河流相的构型界面分级体系,对分汊与游荡型两种辫状河储层内发育的隔夹层层次结构及特征进行了分析。研究发现,分汊型辫状河隔夹层主要包括泛滥平原沉积、泥质充填或半充填河道、落淤层及沟道细粒沉积。而游荡型辫状河隔夹层仅包括泛滥平原沉积和少量泥质半充填河道。不同层次、不同规模的隔夹层在岩石类型、发育程度、厚度及展布特征等方面均存在较大差异,对底水油藏水进方式及剩余油分布的控制各不相同。最后总结了隔夹层在垂向上影响剩余油分布的5种模式及其相对应的剩余油富集区。
文内图片：

图片说明：图２邋ＦＮ－邋１２井不同层次隔夹层测井响应特征逡逑Ｆｉｇ．邋２邋Ｗｅｌｌ邋ｌｏｇ邋ｒｅｓｐｏｎｓｅｓ邋ｏｆ邋ｄｉｆｆｅｒｅｎｔ邋ｈｉｅｒａｒｃｈｙ邋ｉｎｔｅｒｃａｌａｔｉｏｎｓ邋ｉｎ邋ＦＮ－１２逡逑
[Abstract]:The previous studies on braided river reservoirs often regard braided river reservoirs as a reservoir type in general, but less on different types of braided river reservoirs. On the basis of literature investigation and outcrop observation, taking FN Oilfield in Sudan as an example, according to the idea of "hierarchical constraint" and referring to Miall's configuration interface classification system of fluvial phase, the layered structure and characteristics of interlayer developed in braided river reservoirs of bifurcation and wandering types are analyzed. It is found that the braided interlayer mainly includes flood plain deposition, muddy filling or semi-filling channel, silting layer and channel fine grain deposition. The wandering braided interlayer only includes flood plain deposition and a small amount of muddy semi-filling channel. There are great differences in rock type, development degree, thickness and distribution characteristics among different levels and different sizes of interlayer, and the control of water advance mode and remaining oil distribution in bottom water reservoir is different. Finally, five modes of interlayer affecting the distribution of remaining oil vertically and their corresponding remaining oil enrichment areas are summarized.
【作者单位】：中国石油勘探开发研究院;
【分类号】：P618.13

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