华庆地区长6致密油储层微观孔喉结构特征

发布时间：2018-04-09 21:07

本文选题：致密油储层　切入点：微观孔喉结构　出处：《西南石油大学学报(自然科学版)》2017年04期

【摘要】：针对鄂尔多斯盆地华庆地区三叠系延长组长6段致密油储层,应用恒速压汞和微、纳米CT扫描分析等技术手段和方法,开展了微观孔喉结构特征研究。研究结果表明,长6致密油储层孔隙以微米级孔隙为主,纳米级孔隙分布频率较低,主流喉道半径为1.07μm,平均喉道半径为0.84μm;平均孔隙半径为140.12μm,平均孔喉比为281.03,微-纳米孔喉特征明显。喉道半径、孔喉比与孔渗关系表明,孔喉特征是影响和制约储层物性的关键因素,孔喉特征参数对渗透率的影响和制约要明显高于其对孔隙度的影响,致密油储层微-纳米CT实验表明,致密油储层发育孔喉网络复杂的纳米-微米级孔喉系统,且具连通性;微-纳米孔隙结构三维重构显示,纳米孔隙一般呈椭圆形、长条形和不规则形,微米级孔隙呈现圆形、椭圆形、三角形和不规则形,石油赋存在较大孔隙的团块状、球形斑点状孔隙结构和微裂缝中。
[Abstract]:In view of the tight oil reservoir of the 6th member of the Triassic Yanchang formation in Hua-qing area of Ordos Basin, the micropore and throat structure characteristics were studied by means of constant velocity mercury injection, micro and nano-CT scanning analysis and other technical means and methods.The results show that the porosity of Chang 6 tight oil reservoir is mainly micrometer pore, and the distribution frequency of nanometer pore is low.The main throat radius is 1.07 渭 m, the average throat radius is 0.84 渭 m, the average pore radius is 140.12 渭 m and the average pore throat ratio is 281.03.The relationship between throat radius, pore throat ratio and porosity and permeability shows that pore throat characteristics are the key factors influencing and restricting reservoir physical properties, and the influence and restriction of pore throat characteristic parameters on permeability are obviously higher than those on porosity.The micro- nano CT experiment of dense oil reservoir shows that the tight oil reservoir has developed a complex network of pore throat system and has connectivity, and the three-dimensional reconstruction of micro- nano pore structure shows that the nano pore is generally elliptical.The micrometer pore is round, elliptical, triangular and irregular. The oil is found in the massive, spherical, speckled pore structure and microfracture of the larger pore.
【作者单位】：中国石油长庆油田分公司勘探开发研究院;北京金谷干线石油科技有限公司;
【基金】：国家自然科学基金(41390451) 国家"973"项目(2014CB239003) 国家科技重大专项(2016ZX05046)
【分类号】：P618.13

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