Secondary Porosity Confirmation By Logging Data

The output of fracture pool is over half of the entire outout of oil and gas,and fracture pool is one of the important fields of oil inhancing yield in 21st Century.But at present,quantitarily computing fracture parameter and forecasting and evaluation of space distribution law of fracture is still a foreland question in oil and geologic field,and this baffle the progress of world oil industry at some extent.From the actuality of domestic and overseas,the study of forecasting and evaluation of fracture and fracture-pool is still in discuss stege. The main reservoir space of fractured reservoir are dissolved pores,karst cave and fracture.At the same time,fracture is the flow channel of fluid.It is very important to study the reponse law and parameter computing method of fracture.Conventional method has low resolution, multi solutions,and bad visualization. And that the use of imaging log is very limited at present.Budart Group of Sudert district in Hailaer Basin is a reservoir that has very low porosity,very low permeability,double pore system and it is rich in fracture.Studied core description,coring in drilling,conventional and imaging logging data,the paper sumarized the type of the reservoir of Budart reservoir into fracture-caved reservoir(consisting of low angle fracture,high angle fracture and cave) and porous-type reservoir.And summarized response in well logging data of different type.Aiming at the complication of lithothology and pore structure of Budart Group reservoir,based on adoption of special well logging(imaging logging etc.) and advanced processing and interpretational method,aiming at different logging series and different pore types,adopted porosity spectrum analyzing and imaging processing and interpretation method,the paper has studied logging interpretation method,realized quantitatively describing of fracture orientation,density,width and open extent and quantitatively compute of matrix porosity,secondary porosity and effective porosity of double porors reservoir.Using aggregate probability index method,combining conventional and imaging logging data tightly,confirmed comprehensive evaluation parameter of fracture in index of fracture developing index, effectively guided the evaluation of complicated fractured reservoir, provided effective technology auspice for the production of studied district.