Abstract
The reservoir performance of pyroclastic reservoir plays an important role in hydrocarbon accumulation. In view of the unclear understanding of reservoir characteristics and control factors in block Su 13, geological and seismic data and logging data are used to conduct a detailed study of the reservoir in the study area. The results show that the carboniferous reservoirs are mesopore and ultra-low permeability reservoirs. The fault system in the study area is complex and can be divided into three grades according to the size of the fault interval. Fractures are relatively developed in the study area, and they are developed to varying degrees in all lithologies. The overall fracture development ratio is 17.21%. The controlling factors of reservoir development are mainly diagenesis and tectonics. Diagenesis, which plays a constructive role in porosity, is mainly fracture, and micro-fractures formed by fracture also provide a good dissolution channel for dissolution. Tectonics is the main factor of fracture formation. The better oil-bearing lithology in the study area is composed of sedimentary tuff and tuff.
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