岩性油气藏 ›› 2024, Vol. 36 ›› Issue (4): 159168.doi: 10.12108/yxyqc.20240414
卢科良1,2, 吴康军1,2, 李志军1,2, 孙永河2, 徐少华1,2, 梁锋3, 刘露2, 李爽1,2
LU Keliang1,2, WU Kangjun1,2, LI Zhijun1,2, SUN Yonghe2, XU Shaohua1,2, LIANG Feng3, LIU Lu2, LI Shuang1,2
摘要: 利用测井、录井、岩心分析化验等资料,对川中古隆起北斜坡下寒武统龙王庙组油气成藏条件、油气充注特征及成藏演化模式展开了深入研究。研究结果表明:①川中古隆起北斜坡下寒武统龙王庙组天然气具备良好的成藏条件,下伏筇竹寺组烃源岩在北斜坡腹部及西侧裂陷槽存在 2 个生烃中心,其TOC 平均值分别为 1.90% 和 3.46%,有机质以Ⅰ型干酪根为主,可提供充足且优质的烃源;龙王庙组内部发育的颗粒滩体岩溶储层与上覆高台组厚层致密泥质云岩,构成了优势储-盖组合;区内广泛发育的油源断裂可作为纵向优势运移通道高效输导油气。②研究区龙王庙组具 3 期成藏特征:晚三叠世末期(约 214~206 Ma)发生第 1 期充注,大量成熟油聚集形成古油藏;早侏罗世末期(约 193~186 Ma)发生第 2 期充注,表现为“多油少气”混合充注;中侏罗世末期(约 170~164 Ma)发生第 3 期充注,大量油裂解气充注储层并聚集形成现今气藏。③研究区龙王庙组油气成藏演化可划分为 4 个阶段:加里东早期—二叠纪前少量低熟油充注阶段、二叠纪—三叠纪大量成熟油充注形成古油藏阶段、中侏罗世—白垩纪古油藏被破坏形成裂解气藏阶段以及晚白垩世至今气藏调整阶段。
中图分类号:
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