利用鄂尔多斯盆地镇泾油田沉积微相展布与演化规律分析油田开发调整方向  

Adopting the distribution and evolution laws of depositional microfacies in analyzing the directions of oilfield development in the Zhenjing oilfield,Ordos basin

作　　者：李胜利[1] 赵舒[2] 付菊[1] 秦秉操[2] 柳林旺[2] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石化华北分公司勘探开发研究院,河南郑州450006

出　　处：《地学前缘》2008年第1期85-93,共9页Earth Science Frontiers

基　　金：高等学校博士学科点专项科研基金项目(20050491001)

摘　　要：油田沉积微相的展布与演化规律控制着主要有利储层的分布,因而油田开发调整方向可根据这些规律来综合考虑。镇泾油田位于鄂尔多斯盆地西南部,该油田长6油层组属于浅湖背景下的辫状河三角洲前缘沉积,其主要沉积微相包括水下分流河道、河口坝、远砂坝、席状砂、水下分流间及前三角洲泥。该区三角洲分布主要受控于两个大致平行分布的南西-北东向主河道,受基准面升降与沉积物供应的共同作用,三角洲演化呈阶段性变化,大致经历了初始发育期、繁盛发育期、间歇发育期、活化发育期等4个演化阶段,其中繁盛发育期与活化发育期的三角洲水下分流河道与河口坝砂体是主力含油储层。研究区辫状三角洲展布与演化的特点决定了今后油田开发的重点在西南部河道带两侧及东北部三角洲前缘的前端;而垂向上应以优先考虑三角洲繁盛发育期与活化发育期的叠加砂体厚度较大为原则。The distribution and evolution laws of depositional microfacies in oilfields dominate the distribution of main favorable reservoirs, therefore, the direction of oilfield development could be considered according to these laws. The Zhenjing oilfield is located at the southwestern part of the Drdos basin. The sixth interval of the Yanchang formation belongs to braided delta front deposition under the condition of lacustrine shore, and the major depositional microfacies include subaqueous distributary channel, mouth bar, distal bar, sand sheet, subaqueous interdistributary bay and prodelta mud. The distribution of delta was dominated by two main river belts which are nearly paralleled each other from southwest to northeast as a whole. Meanwhile, controlled by the base level rising and falling, and the sediment supply, the evolution of delta had experienced four periods including initial forming stage, highly developing stage, intermittent stage and reviving stage. Therefore, those sandbodies, such as subaqueous distributary channels, mouth bars in the periods of highly developing stage and reviving stage, were the main reservoirs bearing oil and gas. The braided delta distribution and evo- lution features suggest that the two sides of the southwest main river belts and the outside part of the northeast delta front would be the main areas for oilfield development in the future; meanwhile, in the vertical direction, one fundamental factor should be considered first, i. e. , the thickness of sandbodies in the highly developing and reviving stages should be relatively greater.

关 键 词：镇泾油田 沉积微相 三角洲前缘 三角洲演化 油田开发调整方向 

分 类 号：P631.1[天文地球—地质矿产勘探]