扇三角洲沉积高分辨率层序对比及其对油藏开发的指导意义:以柳北油田Ⅳ2砂组为例

来源期刊:中南大学学报(自然科学版)2014年第7期

论文作者:刘丽 张廷山 赵晓明 吴胜和 岳文珍 齐立新

文章页码:2278 - 2289

关键词:扇三角洲;柳北油田;层序格架;沉积旋回

Key words:fan delta; Liubei Oilfield; sequence stratigraphic framework; sedimentary cycles

摘    要:以柳北油田Ⅳ2砂组为例,应用高分辨率层序地层学原理,以分级控制、模式指导、相控约束为对比方法,重建研究区扇三角洲高分辨率层序地层格架,并指出其对油田开发的指导意义。研究结果表明:中期旋回是受强烈构造活动产生的异旋回,其基准面的变化使得不同期次的沉积地层中微量元素、放射性等存在明显差异,造成Ⅳ2砂组顶界面上下自然伽马存在具有等时意义的拐点;短期旋回是自旋回或受自旋回干扰的异旋回,其基准面的变化造成不同期次间存在明显前积现象,前积角度为2°~5°,且层序地层自下而上倾角逐渐减小;超短期旋回是自旋回,其基准面的变化造成砂体叠置方式呈独立型、叠加型和切叠型,受水动力条件的控制,扇三角洲砂体往往以叠加型和切叠型2种叠置模式为主;短期旋回(小层)规模的注采关系不完善,导致剩余油分布。

Abstract: The principle of the high resolution sequence stratigraphy was applied to rebuild high resolution sequence stratigraphy frameworks of target zone by the methods of “classification controlling”, “model guiding” and “facies restricted”, and the important references for oil field development were pointed out. The results show that the medium-term cycles are allogenetic cycles by strong structural activities, and the change of datum level makes microelement and radioactivity difference in different periods sedimentary formations so that it exists GR inflection point with age equivalence up and down the top of Ⅳ2 sand group. The short-term cycles are autocycles or allogenetic cycles disturbed by autocycles, and the change of datum level makes forest with 2°-5° dip angle among different periods, and the dip angle of sequence stratigraphic decreases from bottom to top. The ultra short-term cycles are autocycles, and the change of datum level makes three kinds of superimposed sand, i.e. isolated pattern, overlying pattern and inclosed pattern. The short-term cycles with perfect injection-production relationship in appearance are faulty in actuality, which leads to the distribution of the remaining oil.

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