地址:四川省成都市高新区天府大道北段12号中国石油科技大厦

电话:028-86015441;028-86015319

邮箱:gaskk@petrochina.com.cn

QQ群:489323588

您所在位置:首页->过刊浏览->天勘2018.2


海相页岩与陆相页岩微观孔隙结构差异——以川南龙马溪组、鄂尔多斯延长组为例
Differences of micropore structure between marine shale and continental shale: Examples from Longmaxi Formation in southern Sichuan Basin and Yanchang Formation in Ordos Basin
庞 铭1 陈华兴1 唐洪明2 冯于恬1 方 涛1 刘义刚1 赵顺超1 王宇飞1
点击:1114次 下载:32次
DOI:
作者单位:1. 中海石油(中国)有限公司天津分公司 2. 西南石油大学油气藏地质及开发工程国家重点实验室
中文关键字:孔隙结构 海相页岩 陆相页岩 氮气吸附 高压压汞 孔径分布
英文关键字:Pore structure; Marine shale; Continental shale; Nitrogen adsorption; High-pressure mercury injection; Pore size distribution
中文摘要:目前工业化开采的页岩气资源主要来自海相沉积地层,但是陆相页岩气的勘探开发也已取得了重要突破。而海相页
岩与陆相页岩的沉积环境不同,其对应的岩石孔隙结构也会存在一定的差异。因此以川南下志留统龙马溪组海相页岩和鄂尔多斯
盆地上三叠统延长组长7 段陆相页岩为研究对象,采用聚焦离子束扫描电镜定性观察页岩微观孔隙结构,结合低压氮气吸附法和
高压压汞法定量表征页岩微观孔隙结构,对比海相页岩与陆相页岩微观孔隙结构及其影响因素。结果表明:①龙马溪组海相页岩
基质中粒间孔隙主要以颗粒边缘孔的形式存在,可见少量粒内溶孔和晶间孔,发育大量气泡状和线状纳米级有机孔;②长7 段陆
相页岩内部含较多的片状黏土和云母片间的狭缝型孔隙,有机孔发育较少,且多为干酪根演化生烃后残留的数百纳米到数微米的
宏孔;③ 3 ~ 30 nm 的孔隙对总孔隙体积贡献最大;④龙马溪组页岩微孔、细中孔和微米级宏孔占比远高于长7 段页岩。分析认为:
龙马溪组海相页岩由于脆性矿物含量、热成熟度和有机质丰度都较长7 段陆相页岩高,整体上龙马溪组页岩的孔隙度和氮气吸附
孔体积均远远大于长7 段页岩。

DOI: 10.12055/gaskk.issn.1673-3177.2018.02.005



英文摘要: Currently, shale-gas resources under industrialized exploitation come from marine formations; however, a significant breakthrough
has been made in the exploration and development of continental shale gas. Since marine and continental shale are different
in sedimentary environment, their pore structures are different. In this study, the microscopic pore structures of both Lower Silurian
Longmaxi Formation marine shale in southern Sichuan Basin and Upper Triassic Chang 7 Member continental shale in Ordos Basin
were observed qualitatively by using the focused ion beam scanning electron microscope (FIB-SEM), and characterized quantitatively
by means of low-pressure nitrogen adsorption (LPA) and high-pressure mercury injection porosimeter (MIP). Moreover, their influence
factors were identified. Results show that, (1) in the matrix of Longmaxi marine shale, intergranular pores primarily appear as particle
edge ones, a small quantity of both intragranular dissolved and intercrystalline pores are observed, and a large number of nano-scale
bubble and linear organic pores are developed; (2) in Chang 7 continental shale, there are more slit pores of the laminar clays and
mica, only a few organic pores are developed and most of them are residual macropores of hundreds of nanometers to several micrometers
formed after kerogen’s evolving to hydrocarbon; (3) the pores with diameter of 3–30 nm contribute the most to the total pore volume;
and (4) the proportion of micropores, thin mesopores, and micrometer-scale macropores in Longmaxi shale is much higher than
that in Chang 7 shale. In conclusion, the brittle-mineral content, thermal maturity, and organic-matter abundance of Longmaxi marine
shale are higher than those of Chang 7 continental shale, so the porosity and nitrogen adsorption pore volume of the former are much
higher.
读者评论

      读者ID: 密码:   
我要评论:
国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
主管单位:中国石油西南油气田公司  主办单位:中国石油西南油气田公司勘探开发研究院
版权所有©2020天然气勘探与开发》编辑部 蜀ICP备10004100号
本系统由北京菲斯特诺科技有限公司设计开发
您是本站第2720657名访问者