岩性油气藏 ›› 2025, Vol. 37 ›› Issue (3): 5972.doi: 10.12108/yxyqc.20250306
• 地质勘探 • 上一篇
邓高山, 董雪梅, 余海涛, 张洁, 岳喜伟, 任军民, 姜涛
DENG Gaoshan, DONG Xuemei, YU Haitao, ZHANG Jie, YUE Xiwei, REN Junmin, JIANG Tao
摘要: 通过有机碳含量测定、岩石热解、铸体薄片分析、扫描电镜分析等多种实验手段和方法,对准噶尔盆地沙湾凹陷烃源岩、储层和成藏条件进行了综合研究。研究结果表明:①准噶尔盆地沙湾凹陷三叠系百口泉组为缓坡浅水退积式扇三角洲沉积,发育扇三角洲前缘和滨浅湖相沿岸砂坝2类有利砂体,具有横向连片、纵向叠置的分布特征,岩性呈“下粗上细”的正旋回特征,储层物性整体上为特低孔—低孔、特低渗—低渗,平均孔隙度和平均渗透率分别为7.8%和2.38 mD,自下而上物性逐渐变好,其中百三段储层物性最好,受沉积相控制作用较明显,且绿泥石膜对胶结作用的抑制、钠长石溶蚀增孔、烃类持续充注形成的超压等均对优质储层的发育具有重要影响。②研究区以风城组盐湖优质烃源岩为主的多套烃源岩对百口泉组储层进行持续油气充注,可分为垂向型和侧向型2类源储配置,二者的紧密程度控制了油气的富集程度;扇三角洲前缘亚相储集层分布广、面积大、孔隙度多大于15%,且发育高角度深大断裂、不整合面和砂体3类高效输导体系,上覆区域性盖层,成藏条件优越。③沿北西向发育的一系列鼻凸,距烃源岩近,为构造有利勘探区,坡折带为岩性有利勘探区。
中图分类号:
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