Crack Reservoir Fractal Dimension Applied Research

The reservoirs located in L area of QX Oil Field fall into lithological fractured reservoir.The fractures have made up of both the primary reservoir space of oil and gas and the central permeating channel of oil and gas.The reserve and productivity of oil and gas in the field are basically controlled by the develop and distribution of fissures.Due to the existence of fissures,the exploration to the area is extremely difficult early,and the earlier production declines fast after development,and the yield is very unstable.Therefore,this dissertation is going to focus on the type identification of fractured reservoir, the log geology interpretation of characteristic of reservoir porosity and permeability and the develop and distribution pattern of reservoir fracture.For this purpos, from the point of the log geology, aimed at the actuality of the current fractured reservoir log geology interpretation and evaluation, based on synthetical analysis of the current domestic and foreign fruit of fractal dimension investigation of reservoir fracture, using the method and technique of fractal dimension, through the further discussion of the fractal dimension characteristics of m index and n index in the log interpretation Archie model in a sample way and through the theoretic reasoning to the fractal dimension Dfa and m index of fractured reservoir interval's log curve, according to the geophysical signification of the fractal dimension Dfa of fractured reservoir interval's log curve shape:the more complicated the change of the curve shape is ,the larger the its Dfa value is, then the more complicated space structure of fracture and pore, then the higher value of m index of space structure of fracture and pore, and so on, the text propounds an improved method, based on box dimension, of covering log curve with scale grid, and by programming computes the Dfa and its m index value of fractured reservoir interval's log curve, for instance, AC and RT curve, ect, then further puts this technique into application investigation, and makes analysis of application effects in the reservoirs located in L area of QX Oil Field from three aspects:1.The Dfa and its m index value of fractured reservoir interval's log curve, for instance, AC and RT curve, ect, which are derived from computing, is used to identify reservoir type by crossplotting m index with the product Df_ACRT of fractal dimension of ACoustical wave log curve and Restivity log curve and by experiential discriminance plate of reservoir type in L area of QX Oil Field.2.To study quantificationally properties characteristic of reservoir fracture of Cretaceous Lower and how is the response characteristic of dual laterolog swayed by reservoir fracture in L area of QX Oil Field.3.To study quantificationally characteristic of reservoir porosity and permeability, and to explore interrelationship between fractal dimension of reservoir fracture and fractured reservoir characteristics parameters, and then to reflect the true situation about characteristic of reservoir porosity and permeability more impersonally.