Resercoir space characteristics and pore structure of Jurassic Lianggaoshan Formation lacustrine shale reservoir in Sichuan Basin, China: Insights into controlling factors

The Jurassic Lianggaoshan Formation lacustrine shale oil is the most potential exploration target of unconventional hydrocarbon resource in Southwest China. In this study, nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), low-temperature N 2 adsorption (LTNA), and high pressure mercury intrusion injection capillary are intergrated to reveal pore structure its controlling factors reservoir. Results indicate that three types lithology combination classified Liangggaoshan Type A comprises pure shale. B characterized by frequent shell limestone interbedding. C siltstone relatively proportion organic pores, development good connectivity nanopores, highest volume Surface area. nanopores shales mainly dominated mesopores part macropores. Among them, PV SA both micropores. enrichment matter has little effect on micropores, does not affect mesopore macropore development. Quartz particles do clearly facilitate micropore mesopore-macropore. Intraparticle feldspar clast an important component macropore. Clay minerals no positive formation