密井网条件下钙质胶结条带空间展布研究

发布时间：2018-03-19 13:27

本文选题：钙质胶结条带　切入点：控制因素　出处：《西南石油大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：综合应用铸体薄片、物性分析等资料,以鄂尔多斯盆地华庆地区长8油组为例,对密井网条件下低渗致密砂岩内部的钙质胶结条带进行了研究,明确了其基本特征,阐明了不同位置胶结条带的发育控制因素,建立了密井网条件下钙质胶结条带的空间展布模式。研究表明,华庆地区长8油组砂岩中,钙质胶结条带广泛发育,主要成分为晚期铁方解石。不同发育位置的钙质胶结条带发育主控因素不一,整体胶结式发育主要受控于粒度,中部式主要受侧向临近泥页岩和长石溶蚀影响,顶底式则主要受到粒度和泥页岩发育程度配置关系影响。不同沉积微相组合和构型界面控制了钙质胶结条带的垂向分布,平面上钙质胶结条带主要呈团块状、条带状分布于研究区中部远离物源的分流河道末端及其附近河口坝中部。总体上,密井网条件下钙质胶结条带在空间上呈厚层粗粒砂体内部"顶底胶结厚延伸远—中部胶结薄延伸近"和薄层砂体"整体胶结薄延伸近"的展布模式。
[Abstract]:Taking Chang8 oil formation in Huaqing area, Ordos Basin as an example, the calcareous cementation zone inside the low permeability tight sandstone under dense well pattern is studied, and its basic characteristics are clarified by synthetically using the data of thin cast sheet and physical property analysis, and taking Chang8 oil formation in Huaqing area, Ordos Basin as an example. The factors controlling the development of cemented bands in different positions are expounded, and the spatial distribution model of calcareous cementation bands under dense well pattern is established. The results show that the calcareous cementation bands are widely developed in the sandstone of Chang 8 oil formation in Huaqing area. The main component is late iron calcite. The main factors controlling the development of calcareous cementation belt are different, the overall cementation development is mainly controlled by granularity, and the central type is mainly affected by lateral adjacent shale and feldspar dissolution. The vertical distribution of calcareous cementation zone is controlled by different sedimentary microfacies combination and configuration interface, and the calcareous cementation zone is mainly mass like on the plane, and the vertical distribution of the calcareous cementation belt is mainly affected by the granularity and shale development degree of the top-to-bottom type. The strip is distributed at the end of the distributary channel far from the source in the middle of the study area and in the middle of the nearby estuary dam. Under the condition of dense well pattern, the distribution pattern of calcareous cementation strip in space is "the extension of thick cementitious thickness from the top to the bottom" and that of the thin sand body "the whole cementation thin extension is near" in the body of thick layer coarse grain sand.
【作者单位】：中国石油大学(北京);中海石油(中国)有限公司天津分公司;中国石油勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05009-003) 国家自然科学基金(41372116)
【分类号】：P618.13

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