Formation of overpressure system and its relationship with the distribution of large gas fields in typical foreland basins in central and western China

LI Wei,CHEN Zhuxin,HUANG Pinghui,YU Zhichao,MIN Lei,LU Xuesong

Fig. 2. Profile of overpressure systems and gas accumulations in the Kuangshanliang-Shuangyushi-Jiulongshan-Yuanba area of the West Sichuan foreland basin (the location of the profile is shown in Fig. 1). T1f—Lower Triassic Feixianguan Formation;T2l1—sublayer 1# of the Middle Triassic Leikoupo Formation; T2l2—sublayer 2# of the Middle Triassic Leikoupo Formation; T2l3—sublayer 3# of the Middle Triassic Leikoupo Formation; T2l4—sublayer 4# of the Middle Triassic Leikoupo Formation; T3x—Upper Triassic Xujiahe Formation; Z2dn1—sublayer 1# of the Upper Sinian Dengying Formation; Z2dn2—sublayer 2# of the Upper Sinian Dengying Formation; Z2dn3—sublayer 3# of the Upper Sinian Dengying Formation; Z2dn4—sublayer 4# of the Upper Sinian Dengying Formation.