赵迪斐;郭英海;解徳录;苏驰;杨玉娟;于一帆;

• 1:中国矿业大学资源与地球科学学院

• 2:中国矿业大学煤层气资源与成藏过程教育部重点实验室

摘要(Abstract)：

为研究页岩储层孔隙结构特征,以重庆南川三泉剖面泉浅1井、綦江观音桥剖面、涪陵B井和石柱打风坳剖面等龙马溪组页岩储层样品为例,通过低温氮吸附实验数据建立FHH分形模型,讨论分形维数与孔隙结构参数、TOC质量分数的相互关系.结果表明:样品孔隙以微孔为主,孔径分布集中在40nm以下,具有明显的分形特征,分形维数介于2.760~2.850之间,相关因数大多超过0.99,反映复杂的孔隙结构与较强的非均质性;部分样品显示明显的双重分形特征,以甲烷分子自由程为界可将纳米孔分为渗透孔隙和吸附孔隙,吸附孔隙阶段分形维数变化范围在2.881~2.917之间,渗透孔隙阶段分形维数变化范围在2.791~2.823之间;孔隙体积和平均孔径与分形维数具有负相关性,BET比表面积与分形维数呈明显的正相关关系,即平均孔径越小、孔隙体积越小、BET比表面积越大,分形维数越接近于3;TOC质量分数也与分形维数呈明显的正相关关系,是分形维数的重要影响因素.通过分形维数可以定量评价储层孔隙的复杂程度和非均质程度,为储层评价和页岩气在纳米孔隙中的赋存和运移机理研究提供思路.

关键词(KeyWords)：页岩储层;孔隙;分形维数;氮气吸附法;FHH分形模型

Abstract:

Keywords:

基金项目(Foundation):国家重点基础研究发展计划(973计划)资助项目(2012CB214702);; 中国矿业大学大学生创新创业基金资助项目(201415)

作者(Author):赵迪斐;郭英海;解徳录;苏驰;杨玉娟;于一帆;

Email:

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