二连盆地蒙古林砾岩油藏阿三段储层宏观非均质性及剩余油分布研究

A STUDY ON CONGLOMERATE RESERVOIR HETEROGENEITY AND RESIDUAL OIL DISTRIBUTION OF MEMBER A3 IN MENGGULIN AREA OF THE ERLIAN BASIN

李继红 曲志浩 岳乐平 肖伟 杨亚娟

LI Ji-hong QU Zhi-hao YUE Le-ping XIAO Wei YANG Ya-juan

西北大学, 陕西 西安 710069

Northwest University, Xi'an, Shaanxi 710069, China

该文应用二连盆地蒙古林砾岩油藏的动、静态资料,对砾岩储层的宏观非均质性作了精细描述。蒙古林砾岩储层属于辫状河三角洲沉积,沉积条件和成岩作用不仅控制了储层的宏观展布、层内韵律、隔夹层分布和孔、渗的变化,而且使得砾岩储层具有明显的分区性,西北区表现为块状结构,向东南区逐渐变为层状结构。同时结合砾岩油藏的地质特征和注采方式等方面的研究,指出剩余油分布受沉积微相、构造条件、注采方式和增产措施等因素的控制。特高含水期的剩余油分布主要集中于局部构造相对高部位,块状结构区的锥间带,以及层状结构区两口注水井间油层的上部;水下河道微相的储层以中到低渗为主,水驱效率不高,仍为剩余油相对富集区。

Based on dynamic and static information of conglomerate reservoirs in Menggulin area of the Erlian basin,a fine description of heterogeneity of the conglo merate reservoirs has been given.The conglomerate belonged to sediments of a braided river delta.The sedimentation and diagenesis controlled macro distribution of the reservoir,intra bed rhythm,the distribution of inter beds and change of porosity and permeability.The conglomerate was massive structured in the northwest and showed bedded structure in southwest area.It is showed that distribution of residual oil is controlled by sedimentary micro facies,structural condition,relationship of injection and production.Residual oil is concentrated in the high part of local structure,the oil zone of masive reservoirs and the upper part of bedded reservoirs between injection wells in higher water cut stage.The reservoirs of subaqueous channel micro facies with middle to low permeability showed low water driving efficiency,are the rich area of residual oil distribution.

https://doi.org/10.11781/sysydz200302153