关键词: 下古生界, 陆表海, 烃源岩, 碳酸盐岩, 储集层, 沉积特征, 沉降中心

Abstract: The Lower Palaeozoic groups have the wide range of distribution and thicker sedimentary thickness in North China Basin. The sedimentation and subsidence center of the Lower Palaeozoic is migrated continually, and the migratory property is mostly controlled by the tectonic mobile belt of slab fringe. There is no structural deformation (fold or fracture) in the slab, so the difference between sedimentary environment and sedimentary thickness is small. Generally, the basin shows the inland sea sedimentary environment of shallow water, high energy and abundant detritus. The organic matter abundance of sedimentary rock is low, and there is basically no effective source rock. The organic matter abundances of more than 1500 samples of sedimentary rocks were counted, and the relationship between organic matter abundance and lithology or sedimentary facies was discussed. The relationship between forming mechanism of cave-type reservoir of carbonate rocks in the Lower Palaeozoic and structural movement shows that the ancestral karst in the Caledonian Stage mostly happened in Taikang-Kaifeng ancestral incline, and the ancestral karst in the Indosinian Stage mostly happened in the fold or nappe structural belt in the western Tanlu Fault. They all may form the commercial carbonate rock reservoirs.

Key words: Lower Palaeozoic, inland sea, hydrocarbon source rocks, carbonate rocks, reservoir, deposition features, subsidence center