The Iran Kasan Of Qom C4 Sub-cracks

Iran Kashan area which located in central Iran basin, which was bounded to the east by the Lut Blocks, to the southwest by the Zagros Fold-Thrust Belt, and to the north by Alborz Fold Belt. Qum Formatiom with carbonate is mainly exploration aim stratum, the C4 member of Qum Formatiom is mainly production layer. the reservoirs are of fracture type. Fracture of the C4 member of Qum Formatiom is not only mainly peretration channels but also is reservoir spaces. So the study on this area fracture possesses important theoretical and practical significance.Based on the Logging data, Through the study of basic geology, including stratigraphy, lithology, sedimentary facies, geotectonics, sedimentary environments, etc., synthesizing the study of fracture development and distribution of drilling cores and field outcrops and utilizing the data of core and outcrop fracture development, the author has made the restricted inversion of dual-log response to conduct a definite quantity inversion forecast for the fracture along the column longitudinally. Then statistic analysis fracture parameter (fracture width, fracture porosity, fracture peameablity) , point out avail development segment, finally discuss the control factors of fracture development, such as such as fault faction, sedimentary facies and deposit environment, lithology, ingredient, structural situation, tectonic stress, stress episodes.