Abstract
When natural cracks in oil & gas development of tight sandstone remain valid, effective crack degree is the decisive factor of reservoir enrichment and high production. Taking the reservoir of the Bashijiqike Formation in Kuqa depression, Tarim Basin as an example, the crack parameters were characterized by a mathematical model and algorithm, which lays a theoretical foundation for the study of crack validity. According to crack parameters processed by electric imaging and static modulus date of rock mechanics, control conditions that constrain crack development such as crack permeability, the normal stress on crack surface and the angle between maximum principal stress and crack strike were obtained. In addition, quantitative expressions between constraints on crack development and productivity were established and the main control factors of fracture validity were confirmed. In the end, the crack development degree and effectiveness were comprehensively evaluated.
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