Exploring the diversity of methods in the study of minerals: a case study on organic-rich shale in the Shahejie Formation, Bohai Bay Basin

This study delves into the continental organic-rich shale of the Shahejie Formation in the Lijin Sag, Dongying Sag, Bohai Bay Basin, with a focus on exploring the diverse array of methods and approaches utilized to study minerals. By employing an assortment of analytical techniques, including XRD diffraction, scanning electron microscope observation, QEMSCAN scanning, organic matter type detection, TOC testing, and thermal maturity tests, we elucidate the material composition, lithofacies type, and lithofacies combination of the organic-rich shale. Moreover, our investigation incorporates comprehensive imaging logging, core scanning, thin section observation, SEM, CT scanning, FIB-SEM, porosity analysis, nuclear magnetic resonance, high-pressure mercury injection, and gas adsorption to characterize the pores and fractures of shale reservoirs at different scales. The controlling factors influencing the spatial development and evolution of shale reservoirs are thoroughly discussed. In addition, we conducted conventional pyrolysis and multi-temperature pyrolysis experiments to study the shale oil content in different occurrence states. This allowed us to clarify the oil-bearing properties and occurrence characteristics of the shale. Lastly, based on our research findings and the comprehensive evaluation of the oil-bearing capacity and production performance of wells with different productivity in the study area, we not only discuss the law of shale oil enrichment but also establish a model for shale oil enrichment. This study serves as an important contribution to understanding the diversity of methods employed in the study of minerals, particularly in the context of continental organic-rich shale reservoirs. It offers valuable insights for guiding regional shale oil exploration endeavors.