天然气地球科学 ›› 2022, Vol. 33 ›› Issue (9): 13631383.doi: 10.11764/j.issn.1672-1926.2022.05.001
• 天然气地质学 • 下一篇
易士威1(),李明鹏1(),郭绪杰2,杨帆2,杨海军3,孙瑞娜2,王孝明3
Shiwei YI1(),Mingpeng LI1(),Xujie GUO2,Fan YANG2,Haijun YANG3,Ruina SUN2,Xiaoming WANG3
摘要:
塔里木盆地寒武系盐下具备形成复式大油气区的成藏条件,是勘探程度最低、勘探潜力最大的战略接替领域。但多年的勘探一直未取得重大突破,关键问题是由于生烃中心、规模性滩体储层控制因素及空间展布不清而导致有利勘探方向和区带不明。鉴于此,综合应用地震和钻井、测井、录井及地球化学等资料,开展寒武系盐下控源、控储、控盖和控藏研究,构建寒武系盐下领域控藏模式,明确有利区带和勘探突破方向。取得了以下几点认识:①古裂谷控制生烃中心。南华系—震旦系形成的断坳结构为下寒武统的发育提供了构造背景,控制了寒武系玉尔吐斯组的沉积,在裂谷控制的负向构造区玉尔吐斯组厚度大,形成生烃中心。②古隆起控制滩相白云岩储层。与南华纪古裂谷同时形成的古隆起控制了肖尔布拉克组高能滩的发育与分布,塔南古隆起南北两侧形成规模性白云岩滩相储层。③古坳陷控制膏盐岩盖层发育。在中晚寒武世由于轮台—古城近南北向镶边台缘的发育造成塔西台地封闭从而形成强烈的蒸发环境,在统一的台内坳陷沉积了广覆式膏盐岩盖层。④“裂—隆—坳”格架控制生储盖时空匹配及油气分布。构建了稳定型“裂—隆—坳”、活动型“裂—隆—坳”、过渡型“裂—隆—坳”3种控藏模式,指出稳定型和过渡型地区是寻找寒武系盐下大气藏的主要勘探方向,明确阿瓦提凹陷和满西凹陷之间的阿满低隆起是寒武系盐下大气田勘探的首选目标区。
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