Abstract:

It is very difficult to evaluate low porosity and low permeability sandstone reservoirs and to develop these reservoirs using logging data. The fracture development could affect the production of this type of reservoir and is very important. In order to take advantage of conventional logging data to evaluate tight sandstone reservoir fracture development, in this paper, based on the caliper, resistivity, density and sonic logging curves, eight fracture indication parameters were calculated. Then an integrated recognition parameter of fracture was constructed by using the eight parameters.The integrated parameter for recognizing fractures was more correct. This method was used for the identification of tight sandstone reservoir fracture in Zhenjing oilfield of southwest of the Ordos Basin and the correct rate is 81.4% for all samples. Therefore, this paper provides a way for the use of conventional logging data to evaluate the fracture development and effectiveness of tight sandstone reservoirs, and it is valuable to the exploration and development of tight sandstone reservoirs.

Key words: Zhenjing oilfield, tight sandstone reservoir, fracture identification, logging