鄂尔多斯盆地陇东地区延长组长6 — 8低渗透储层微裂缝研究
网络出版日期: 2007-12-15
Micro-fractures in extra-low permeability reservoir of Yanchang Formation in Ordos Basin
Online published: 2007-12-15
微裂缝是低渗、特低渗透储层最主要的渗流通道之一。陇东地区延长组储层属于特低渗透储层, 宏观裂缝与微观裂缝非常发育。用偏光显微镜、扫描电镜等分析测试手段, 对微裂缝的产状、特征、面密度、平面分布规律及其对渗透率的贡献率进行了探索性的研究, 指出微裂缝受到沉积、成岩、构造侧向挤压、矿物成分、结构构造、下伏地层隐伏断裂等多重因素的控制, 展布方向呈北东向分布, 其面密度越高, 对渗透率贡献越大。微裂缝的存在对基质和宏观裂缝的连通具有重要的作用,是原油高产的因素之一, 也是油田开发部署时应重点考虑的因素之一。
关键词: 核磁共振测井; 双回波间隔DTE; 固有弛豫时间T2int; 含烃饱和度中图
何宗斌 , 倪 静 , 伍 东 , 李 勇 , 刘丽琼 , 台怀忠 . 鄂尔多斯盆地陇东地区延长组长6 — 8低渗透储层微裂缝研究[J]. 岩性油气藏, 2007 , 19(4) : 40 -44 . DOI: 10.3969/j.issn.1673-8926.2007.04.007
Micro- fracture is one of the main flow passages for low permeability reservoir. The reservoir of Yanchang Formation in Longdong area is extra- low permeability reservoir. By using the frequency analysis methods such as polarizing microscope and SEM, the occurrence, features, surface density, planar distribution rules and the contribution to permeability of the micro- fractures are analyzed. It points out that the microfractures are widely developed in this area and controlled by factors of sedimentation, diagenesis, tectonic lateral compression, mineral component, structural tectonics, hidden fracture of underlying strata and so on. The surface density of the micro- fracture is closely related to the permeability. Micro- fracture is the key factor which should be considered in oilfield development and deployment.
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