Abstract: The macro-and micro-feature of tectonite of Paleozoic-Archean decollement structural belt in Luxi (West Shandong) area is presented by means of structural geology, field geologic survey and lab microstructure analysis, including its effect on deep hydrocarbon exploration. The outcrop study shows that the tectonite is consisted of cataclastic rock with rubbles of carbonate rock, associated with dynamic metamorphisms of silification, marblezation, specularitization and chloritization. Crumpled structure is developed in the thin tectonite. The microstructures of calcite, spar and quartz show the microfeatures of gliding twins, mechanic twins and dynamic recrystallization, indicating that the structural deformation is brittle and plastic deformation with a low temperature. The tectonite of Paleozoic in areal coverage appears the similar characteristic with that in outcrop area, and its cataclastic structure serves as an effective space for oil-gas accumulation. The study shows that the unconformity between the Paleozoic and the Archean was reformed into a structural decollement surface, being of a great significance to the exploration and development of deep buried-hill petroleum reservoirs in this area.

Key words: Luxi (West Shandong) area, decollement, tectonite