岩性油气藏 ›› 2024, Vol. 36 ›› Issue (5): 167177.doi: 10.12108/yxyqc.20240516
魏成林1,2, 张凤奇1,2, 江青春3, 鲁雪松3, 刘刚3, 卫延召3, 李树博4, 蒋文龙4
WEI Chenglin1,2, ZHANG Fengqi1,2, JIANG Qingchun3, LU Xuesong3, LIU Gang3, WEI Yanzhao3, LI Shubo4, JIANG Wenlong4
摘要: 利用钻井、录井、测井以及实测地层压力等资料,采用考虑多种超压机制的盆地模拟技术,综合判识了准噶尔盆地阜康凹陷东部二叠系地层超压的成因机制,定量恢复了各成因类型的超压演化特征。研究结果表明:①准噶尔盆地阜康凹陷东部二叠系发育弱超压—强超压,地层压力系数为1.36~1.88,过剩压力为12~49 MPa,不同构造部位发育的超压存在明显差异。凹陷区超压最强,地层压力系数为1.50~1.88,过剩压力为23~49 MPa;斜坡带次之,地层压力系数为1.52~1.79,过剩压力为24~37 MPa;凸起区相对最弱,地层压力系数为1.36~1.59,过剩压力为12~23 MPa。②研究区不同岩性的地层超压成因不同,芦草沟组烃源岩超压成因为生烃和欠压实作用;上乌尔禾组储层超压成因为超压传递和欠压实作用;上乌尔禾组泥岩盖层超压成因为欠压实作用。③研究区芦草沟组烃源岩和上乌尔禾组泥岩盖层的超压具有持续增大的特征,芦草沟组烃源岩生烃增压贡献率沿凸起区、斜坡带至凹陷区逐步增大,上乌尔禾组泥岩盖层欠压实增压量也具有相同变化趋势;上乌尔禾组储层超压经历了晚三叠世至晚侏罗世缓慢增大、晚侏罗世末期至早白垩世快速增大、早白垩世末期至现今缓慢增大3个阶段,其中超压传递增压对现今储层超压的贡献率为58.46%~78.86%。
中图分类号:
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