渝东南地区龙马溪组页岩储层孔隙特征分析.doc

文档介绍：
渝东南地区龙马溪组页岩储层孔隙特征分
析
张善进,宫云鹏,汪吉林**
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(中国矿业大学资源与地球科学学院)
摘要:为了研究渝东南地区龙马溪组页岩储层微观孔隙发育特征,运用了环境扫描电镜试验,
直观观察了页岩表面孔隙微观形态,并通过压汞实验对页岩储层的孔径分布和孔隙结构进行
了进一步的研究。研究结果表明:页岩孔隙为纳米级,以粒间孔、粒内孔、晶间孔、层间微
孔最为多见,面孔率高达 %;页岩孔径分布较复杂,以微孔为主,平均占所有孔径孔隙
的 %。其次为大孔,平均占所有孔径孔隙的比例为 %,中孔和小孔发育相对较少;
从压汞的进-退汞曲线可以看出,渝东南地区泥页岩样品都具有滞后环,但退汞效率普遍较
低,表明孔隙与吼道的分布不均一,页岩的连通性相对较差。
关键词:页岩;孔隙;扫描电镜;压汞;渝东南
中图分类号:
Analysis of characterization microscopic pore structures in
shale reservoirs, southeast of Chongqiong
ZHANG Shangjin, GONG Yunpeng, WANG Jilin
(School of Resources and Earth Science,China University of Mining and Technology)
Abstract: Nanostructure morphogy of shale reservoirs was investigated using a field-emission
environment scanning electron croscope bined with pressure mercury injection,further
investigation into characterization of poer structure in shale reservoirs was gained in longmaxi, south of
Chongqing. Results show that pores in shale reservoirs are generally in a nanometer grade, it can be
classified into four types: Intergranular pore, intragranular pore, intercrystalline pore and interlayer
pore, porosity is up to %. Shale pore distribution plex, microporous, accounted for an average
of % of all pore. The big hole accounted for an average of %, the hole and a small hole is
relatively less developed. From capillary pressure curves