基准面旋回控制下的复合点坝分布模式

来源期刊:中南大学学报(自然科学版)2015年第12期

论文作者:梁宏伟 何彬 范子菲 赵伦 吴胜和

文章页码:4602 - 4610

关键词:基准面旋回;复合点坝;明化镇组;秦皇岛32-6油田

Key words:base-level cycle; complex composite point bars; Minghuazhen Group; Qinhuangdao32-6 oilfield

摘    要:在建立高分辨率层序地层格架和应用构型正演模拟方法对大井距间复合点坝进行精细识别的基础上,运用基准面旋回沉积动力学原理,对秦皇岛32-6油田明化镇组下段不同旋回阶段复合点坝分布样式的差异特征和演化规律进行分析,探讨复合点坝分布模的影响因素及基准面升降对复合点坝分布模式的控制机理,总结不同基准面旋回内复合点坝的分布特征及其演化规律。研究结果表明:基准面升降引起可容纳空间与物源供给的改变使沉积环境出现差异,导致不同基准面旋回间的复合点坝分布型式出现差异并呈规律性变化,表现为随着可容纳空间与物源供给之比的不断增加,复合点坝规模逐渐变小、砂体间切叠程度降低、内部连通性变差,平面形态由鳞片状向点状演化、剖面样式由多层式向孤立式发展。

Abstract: The differences and evolution characteristics of complex composite point bars distribution pattern of Minghuazhen Group in Qinhuangdao Oilfield were analyzed with base level cycle sedimentary dynamics principle based on the establishment of high resolution sequence stratigraphic framework. The main influencing factors of complex composite point bars distribution patterns and the control mechanisms of complex composite point bars distribution patterns were discussed. The distribution and evolution characteristics of complex composite point bars distribution patterns were summarized. The results show that because of the diversity of sedimentary environment of complex composite point bars in different stages of base level cycle which caused by the variation of accommodate space and sediment supply due to the changes of the base level, the complex composite point bars distribution patterns in different stages of base level cycle are different and evolve regularly. As the ratio of accommodation to sediment increases, the dimension of complex composite point bars become smaller, the inner connectivity of the complex composite point bars becomes weaker, and the plane form of complex composite point bars changes from scale-like to point-like.

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