Reservoir Fracture Studies In Dabei Block Of Kuqa Basin

Cretaceous Bashijiqike formation is main gas production in Dabei block of Kuqa depression, the core porosity is mainly distributed between 3.0 to 8.0% and permeability distribution between 0.01 ~ 0.1 x 10-3μm2, belongs to the low porosity and low permeability reservoir. It is difficult to form a effective reservoir without fracture transformation. Dabei area of reservoir fractures, resulting in permeability from well testing is 1-2 orders of magnitude than core permeability, so fracture characterization is important for oil and gas exploration and development.Based on the analysis of the geological characteristics of Kelasu thrust belt, through the existing core and logging data, stratigraphic correlation, according to the features of the well core and well logging curves of single well facies analysis, and then described the distribution of sedimentary facies, summed up the reservoir space characteristics and pore structure of Bashijiqike formation layer petrology, reservoir.and describe the sedimentary phase distribution, analysis the Bashijiqike formation reservoir basic features.According to the data of outcrops, cores, thin sections, and ancient stress, logging and testing, fine description of reservoir fracture characteristics, formation sequence, analysis the crack development of main control factors(maximum paleo tectonic stress, with the main fault distance, thermal maturity, lithology, thickness of single layer). On the basis of, according to the site to provide the 3D seismic data body, reference to previous tectonic interpretation schemes that FaultED of Dabei area proceedingcrack predicting, and combined with reservoir depth, thermal maturity, the current maximum horizontal principal stress, to predict the fracture of the effective permeability, and semi quantitative and quantitative depicts the tectonic fracture development type sandstone reservoir fracture development scale, effectiveness and the spatial distribution. This result provides a relatively reliable technical methodology for the rolling explorationand overall rating in Dabei 1 gas field,moreover it provides a theoretical basis for the research and exploration of fracture developed and deep buried tight sandstone reservoir in foreland basin.