基于粒间孔贡献量的致密砂岩储层分类——以徐家围子断陷为例

发布时间：2018-05-06 16:55

  本文选题：粒间孔 + 渗流理论　； 参考：《石油学报》2017年10期

【摘要】：粒间孔是颗粒支撑碎屑岩储层最重要的一类孔隙,其相对含量及连通关系共同决定储层品质,尤其对于孔喉结构多样的致密砂岩。粒间孔具有"大孔被细喉沟通"的连通关系,明显不同于"类树形孔隙网络"的粒内孔,利用恒速压汞孔隙体进汞可有效区分粒间孔主导空间分布范围,在此基础上,通过核磁共振定量评价粒间孔对孔隙度的贡献,联合渗流理论及恒速压汞的喉道分布定量评价其对渗透率的贡献。致密砂岩粒间孔主导空间对孔隙度贡献范围为9%~64%,其对渗透率的贡献变化范围为0~87%,两者呈明显正相关;粒间孔对渗透率的贡献量越大,其内流体可动性越好;粒间孔对孔渗的贡献量明显受机械压实和以黏土为主的胶结作用共同影响。选取粒间孔主导空间对渗透率的贡献量(K_(in))为关键参数,将致密砂岩储层划分为粒间孔主导型(K_(in)≥50%)、混合型(10%K_(in)50%)和粒内孔主导型(K_(in)≤10%)3类,该分类综合考虑了对成岩作用敏感的粒间孔主导空间在整个岩石储集和渗流能力及流体可动性等方面的贡献,有效弥补了单纯使用喉道或孔隙大小参数划分具有多样孔喉结构致密储层的不足。
[Abstract]:Intergranular pore is the most important pore in clastic rock reservoir supported by grain. Its relative content and connectivity determine reservoir quality together, especially for tight sandstone with various pore throat structure. The intergranular pore has the connection relation of "big pore with fine throat communication", which is obviously different from the "tree-like pore network" in the intergranular pore. The distribution range of dominant space of intergranular pore can be effectively distinguished by mercury-entering of constant velocity mercury pore body, on the basis of which, The contribution of intergranular pores to porosity was evaluated quantitatively by nuclear magnetic resonance (NMR), combined with percolation theory and the throat distribution of constant pressure mercury. The dominant space of intergranular pore in tight sandstone contributes to porosity in the range of 9J ~ 64, and its contribution to permeability varies from 0 to 87, which is positively correlated with each other, and the greater the contribution of intergranular pore to permeability, the better its fluid mobility. The contribution of intergranular pores to porosity and permeability is obviously influenced by mechanical compaction and cementation of clay. Selecting the contribution of intergranular pore dominant space to permeability as the key parameter, the tight sandstone reservoir is divided into three categories: intergranular pore leading type (K + T) 鈮，

本文编号：1853108