期刊
FUEL
卷 237, 期 -, 页码 860-873出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2018.10.048
关键词
Pore structure; Surface area; Transitional; Mudstone; Shale gas
资金
- National Natural Science Foundation of China [41530315, 41372213]
- National Science and Technology Major Project of China [2016ZX05066003, 2016ZX05066006]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA05030100]
- China Scholarship Council
- British Council [201703780094]
Nanopore networks in organic-rich mudstone play a key role in providing pore space, surface area and channels for gas storage and migration. Controls of nanopore development are still poorly understood, especially for transitional mudstone. Differing from marine and lacustrine mudstone, transitional mudstone is characterized by high kaolinite and low illite contents, and complex organic input. Six transitional mudstones in Linxing Area, eastern Ordos Basin were selected to figure out the influence of kaolinite and organic matter (OM) on pore structures. Sample preparation (OM-removal and kerogen isolation), mineralogical, organic petrographic and geochemical analyses and textural analysis (low-pressure Ar and CO2 adsorption) were performed. Data in other publications were used to test and perfect our conclusion of specific surface area changing with S-2 (second peak in Rock-Eval pyrolysis). Our study demonstrates the pores within 5-50 nm are mainly controlled by quartz contents and are negatively correlated with kaolinite or clay mineral contents. Kaolinite content has little influence on specific surface area, but organic pores, most of which are within 0.3 to similar to 5 nm, contribute much to specific surface area. Higher proportion of marine OM has larger organic pores. Quasi-parabolic + was used to describe the firstly increasing, secondly decreasing and then uncertain relationship between specific surface area and S-2 values. The relationship was found in both transitional and marine mudstones. Surface area changing with S-2 is because TOC, thermal maturity and organic input affect organic pore development and also control S2 values. Micropore specific area of kerogen has a firstly increasing and secondly decreasing trend with hydrogen index (HI) values while S-2 affects micropore surface area of mudstones. Our findings can be used to estimate pore parameters of organic-rich mudstone.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据