Overpressure origin and its effects on petroleum accumulation in the conglomerate oil province in Mahu Sag, Junggar Basin, NW China

LI Jun,TANG Yong,WU Tao,ZHAO Jingzhou,WU Heyuan,WU Weitao,BAI Yubin

Fig. 7. Overpressure origin identification chart by multi-logging combination method under the two-stage linear compaction model. A—Transition point of linear decrease stage and constant stage of porosity; B—Occurrence depth of overpressures of different origins; B°—Reversal depth delay of the logging curve of non-disequilibrium compaction overpressure; C—normal compaction/normal pressure; D—Equivalent depth of disequilibrium compaction.