Abstract:

Basement rock pool in Damintun depression is mainly fractured reservoir,so the accumulation of oil and gas immediately is related to the development of fracture.Thus fractural development is controlled by the structure and lithology. By using the technology of  palaeotectonic stress field and quantitative analysis of fissure fractal, imaging logging, the interpretation of dip well logging and fracture identification of seismic properties, we open out the development law of basement rock fractures Places closing to fracture belt, intercross positions of fracture, turning point of nappe structure and anticlinal structure are zones of fracture development. Fracture reservoirs mainly develop in zones of carbonate and quartzitic sandstone in Great Wall System of Mesoproterozoic and  zones of  leptynite and mixed rock in Archaean era, but not in argillaceous rock, gneiss and intrusive rock.Surfaces of unconform usually are  weathering crust  exposed for a long time, fossil weathered residuum that leached badly, system of fractures and caves develop.So,they are good places of  reservoir development and accumulation of oil and gas.According to  the research conclusions of the fracture development law and the inverse of  seismic properties, we can identify and predict the zones of fracture development in basement rock.

Key words: basement rock pool, fractured reservoir, development law