Lithological Identification of Conglomerate Using Resistivity Imaging Logging:A Case of Baikouquan Formation in Mahu Depression, Junggar Basin, Northwest China

Mahu Depression, in the northwestern margin of Junggar Basin, is one of the most oil and gas bearing depression in the basin. On gentle slope region, a serial of large scale typical conglomerate fan-delta deposits were developed in Triassic Baikouquan Formation. Because of the complication of lithology, lithological identification of the formation is difficult and need to be solved for petroleum important exploration wells. Combining with cores and resistivity imaging logging, a typical lithological chart from resistivity imaging is formed for ten kinds of lithology of Baikouquan Formation in Mabei slope zone. According to the chart, lithology of twenty-one wells is recognized qualitatively. Moreover, result of qualitative identification is compared to that of observation and description of cores. Result of lithological qualitative identification of conglomerates based on resistivity imaging logging makes known the proposed method is feasible and effective.