Using Electric Imaging Evaluation Of Tarim Piedmont Dense Sandstone Fracture Effectiveness

Electric image logging is the advanced logging technology, It is not only the occurrence and structural analysis on the formation, deposition, processing and analysis, sedimentary structures, paleocurrent discrimination, forecasting the direction of sand body distribution, the present stress analysis, wellbore geometry analysis to determine the trajectory of the borehole, can also be the degree of development of the evaluation of crack, Calculate the fracture parameters, identify the effectiveness of fracture. The research of fracture effectiveness began in the mid-20th century, has now formed a very distinctive research methods. From the current situation, forecast and effectiveness of fractured hydrocarbon reservoirs still at the exploratory stage. Prevalence of fractures in the crust, but only those relatively small number of non-closed fracture determine the flow of the liquid, whereas the fracture is valid, depending on the fracture length, fracture width, fracture density and fracture porosity. This article is using the Schlumberger electrical imaging log data and testing data, identify fracture and evaluate effectiveness of tight sandstone front of the mountain in Tarim.The target layer of Tarim Kuqa and Southwest Piedmont region is deeply buried high formation temperature, high pressure, complex lithology is mainly the dense fractured glutenite reservoir,Reservoir permeability is mainly low permeability. Development of a fracture with the oil and gas fields of industrial capacity, and conventional oil and gas fields, compared to the most obvious difference in the rate of recovery of its oil and gas flow under the same conditions to speed up the formation pressure to pass sensitive higher. Therefore, the fracture channel is effective for the development of oil and gas fields exert a great influence. Therefore to evaluate the the effectiveness of fracture is significance.Based on the processing and interpretation of electrical imaging logging data measured by Schlumberger, identified the fracture and calculated the extracted fracture length, depending on fracture width, as the fracture density, as the fracture porosity, the statistics rose diagram of fracture dip, fracture tend roses diagram, the fracture strike rose diagram. According to oil data analysis, Established the relationship between fracture length fracture width fracture density fracture porosity with productivity. Analysis, the production (m3/m/Mpa) and the apparent fracture porosity and the product of the apparent fracture density (equivalent to the fracture porosity and permeability product) is related to good, depending on the fracture length, depending on fracture width, depending on the fracture density and production can be exponentially better the fracture of the electrical imaging parameters and production capacity is closely related to the reservoir capacity with the fracture density and apparent porosity, fracture density, fracture length increases, and also shows fracture in the more developed oil and gas layers yield more high.Based on the double diameter and on the1st plate in the electronic imaging logging data to determine the long axis of the elliptical borehole orientation, and thus determine the the strata maximum horizontal principal stress orientation, the position of the maximum principal stress and fracture strike the relationship between the azimuth angle size and the productivity index, by analyzing the angle the size of the productivity index have a good correlation, the smaller the angle production index is greater, indicating that the fracture system (effective slit) direction with the current maximum horizontal principal stress in the same direction or angle is very small, the fracture can maximize the role of the percolation channel, this time believe that the effectiveness of the regional fracture system strong, and vice versa when the two vertical or oblique crossing angle is large, fracture sper colation role greatly reduce the role of in situ stress has the potential to fracture closure, and the difference between the angle increases, enhance the effectiveness of variation of the fracture system.Through the analysis of testing data, combined with power imaging fracture parameters, the Great Northern, g deep, Dina dry layer, poor gas reservoir, gas reservoir fracture porosity determined by test oil, the crack width limits the Dabei production layer cracks apparent porosity is generally greater than0.05%as the average crack width is generally greater than0.35mm, g deep zones cracks apparent porosity is generally greater than0.051%, depending on the average crack width is generally greater than0.35mm, Dina production layer cracks as the porosity of greater than0.04%, depending on the average crack width is generally greater than0.3mm.Completed a total of22electronic imaging logging data processing and interpretation, identify fracture and the calculation of fracture parameters, through data analysis combined with the testing data to complete the evaluation of the effectiveness of crack, the research results of this article after the Tarim Piedmont tight sandstone of experiments, the effect is similar the Tarim compact sandstone cracks effectiveness evaluation has a strong reference. Therefore, the research not only has great theoretical significance, but also has important practical value.