关键词: 优质储层, 深层碎屑岩, 叠合盆地, 油气勘探

Abstract: High-quality clastic reservoirs deep-buried in superimposed basins of China, with many layers and wide distribution, are the important oil and gas reservoir bodies and exploration targets, which are also key conditions to increase in the exploration effect in seeking for large-scale, high-quality clastic reservoirs in deep superimposed basins. Five reservoir's types, including low-thermal-maturation, solution-pores, fracturepores, high pressure-resistant and heat-resistant, and high fluid-pressure, are the typical better clastic ones, which are also advantageous exploration targets of superimposed basins in China. Among these types, the low-thermal-maturation reservoir is formed by rapid burial and overthrust structure in the later period, mainly controlled by the geothermal gradient, the thermal evolution path as well as the structure deformation history of the basin; Dissolution-pore reservoir may be divided into the meteoric water leaching dissolution and the organic acid dissolution, mainly controlled by the scale of unconformity and the condition of acid dissolution; Fracture-pore reservoirs often form in middle-later diagenesis period, including structure fracture-pore and crushed fractures pore. High pressure-resistant and heat-resistant reservoir may bemainly controlled by rock structure and the rigid component content, such as quartzose sandstone and siliceous sandstone and so on. Due to the abnormal formation could restrain the diagenesis evolution of high-pressure-fluid reservoir, so this type are controlled by formation pressure coefficient, the origins and the period of abnormally high pressure fluid originated.

Key words: high-quality reservoirs, deep-buried clastic rock, superimposed basin, oil/gas exploration