NANOPORE STRUCTURE CHARACTERISTICS OF THE LOWER CAMBRIAN ORGANIC-RICH SHALE IN SOUTHERN CHINA USING N_2 ADSORPTION AND GEOCHEMICAL EXPERIMENTS

摘要

In this paper, the pore structure of the Lower Cambrian organic-rich shale in southern China was systematically studied. The results show that the TOC content of the shale is between 0.45% and 8.50%, with an average of 3.97%. The main pore types include intergranular pores, organic matter pores, clay pores and micro-cracks. The effective pore space of the shale is mainly composed of nanopores with a pore diameter below 6.5 nm, and the organic matter pores are the main contributors to the specific surface and pore volume. The slit-shaped pore is the most predominant type of pore in the shale. Organic matter and epigenetic quartz generally co-exist closely. When the TOC content of shale exceeds 4%, the main pore type inside is organic matter pores.