Abstract
The pore structure plays an important role to understand methane adsorption, storage and flow behavior of geological materials. In this paper, the multi-tests including N2 adsorption, mercury intrusion porosimetry (MIP) and CT reconstruction have been proposed on Tashan lamprophyre samples. The main findings are listed: (1) The pore size distribution has a broad range ranging from 2-100000nm, among which the adsorption pores (<100nm) occupies the mainly specific surface areas and pore volume while the seepage pores (>100nm) only account for 34% of total pore volume. (2) The lamprophyre open pores are mainly slit-like/plate-like and ink-bottle-shaped pores on a two-dimensional level. The lamprophyre 3D pore structure shows more stochastic and anisotropic extension on the z axis to form a complex pore system on a three-dimensional level. (3) The closed pores (>647nm) occupy averaged 74.86% and 72.75% of total pores (>647nm) volume and specific surface area indicating a poor connectivity pore system. The revealed results provide basic information for understanding the abnormal methane emission reasons in similar geological conditions with lamprophyre invasions.
Highlights
Pore structure is characterized by pore size, volume, surface area, pore shape, connectivity, and spatial distribution
Pore diameter below 100nm is calculated by N2 adsorption whereas pore diameter greater than 100nm was calculated by mercury intrusion porosimetry (MIP) and this calculation method is widely used in pore structure characterization.[13,15]
The N2 adsorption, MIP and CT reconstruction analysis were combined on a set of Tashan lamprophyre samples to characterize the complex pore structure
Summary
Pore structure is characterized by pore size, volume, surface area, pore shape, connectivity, and spatial distribution These parameters greatly affect the adsorption and permeability characteristics of geological reservoirs such as coal and shale.[1,2] In China, large area of lamprophyre were found as igneous intrusion strata associated with coal seam in large quantity of coal beds such as Huainan, Datong coalfields, Zhangji coal mine in Xuzhou, Shanjialin coal mine in Zaozhuang.[3,4] Among which the invasions in Tashan mine of Datong coalfields is typical. In the present study, typical invaded lamprophyre samples from Tashan coal mine were selected as testing subjects Considering their strongly heterogeneous, the N2 adsorption, MIP and CT reconstruction methods were combined for the investigation of the pore structure. The Hodot classification for coal pore size is used in this work as micro-pores (
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