Innovation and practice of logging sampling in buried-hill fractured ganite reservoirs

In the stage of logging operation, DST can be partially replaced with the wireline tester for sampling operation.In buried-hill fractured ganite reservoirs, however, lithologies are complex and fractures are quite developed.And, it is extremely adverse to the effective setting of twin packer if high-angle fractures, induced fractures and micro-fractures are developed.In order to select suitable sampling points, these adverse factors shall be eliminated.In this paper, a multi-factor fracture effectiveness evaluation method based on conventional log, electric imaging and array sonic data was proposed.In Well A of BZ19-6 Block, formation fluid is successfully sampled by adopting the twin packer probe for sampling after making use of this new evaluation method to select the sampling depth points.This method provides the technical support for the evaluation of buried-hill ganite reservoirs in this area and its application results are satisfactory.