Origin and Evolution of Clay Mineral and Its Impact on Shale Oil Enrichment: Insight from Qingshankou Formation, Songliao Basin, NE China.

ABSTRACT: Shale oil exploration in China's clay-rich shale formations has gained attention, but the origin and impact of clay minerals on reservoirs remain unclear. This study examines the Qingshankou Formation in the Songliao Basin using Nanomin analysis, X-ray diffraction, X-ray fluorescence analysis, TOC analysis, rock pyrolysis, and FE-SEM to investigate the origin, the evolution, and the pore structures of clay mineral. Illite and I/S mixed layers dominate the matrix, while compaction disrupts their authigenic structures. Illite and I/S mixed layers primarily originate from detrital deposition and transformation of smectite. Chlorite is mostly authigenic and increases with thermal maturity. Illite and I/S mixed layers form elongated intergranular pores and microfractures, which significantly co

SUBMITTER: Kang Y 

PROVIDER: S-EPMC12713455 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature