Experimental Study on Fractional Compositions of Residual Oil from Shale and Coal of China Using Grain-Based MSSV Pyrolysis

Abstract

For better understanding compositions and evolutions of residual oil of shale and coal, a grain-based microscale sealed vessel (MSSV) pyrolysis method to whole rock was used to investigate the residual oil contents and its fractional compositions from shale, coal, and coaly shale samples, as well as their variations at different temperatures and maturities. Quantities of extracted oil from residuals and yields of C1 to C5 gases were used to define oil, wet gas, and dry gas windows using equivalent Ro (%) calculated through EasyRo (%) method. Oil windows are defined as 0.6–1.3%Ro for shale and 0.5–1.2%Ro for coal; wet gas windows are 0.9–3.0%Ro for shale and 0.8–2.7%Ro for coal, and dry gas window are 1.3–4.0%Ro for shale and 1.2–4.0%Ro for coal, respectively. Coal shows relatively wider oil window than shale but similar gas window to shale. The maximum residual oil can reach 133.44 mg/g TOC, 69.84 mg/g TOC for marine and lacustrine shale, 10.03 mg/g TOC for coal, and 83.79 mg/g TOC for coaly shale, respec...