摘要
Cooper盆地油气田发现时间早,勘探开发周期较长,但国内对该盆地的研究程度较低,展开该盆地构造演化、石油地质特征以及油气勘探潜力的研究对我国拓宽海外油气市场意义重大。Cooper盆地是一个发育在花岗岩基底之上的内陆克拉通盆地,南澳区域构造由三凹(Patchawarra、Nappamerri、Tenappera)、两隆(GMI、Murteree)构成。盆地构造沉积演化大致经历了晚石炭世-早二叠世盆地形成阶段、中二叠世-中三叠世盆地持续沉降阶段和晚三叠世盆地消亡阶段等三个阶段。盆地内油气资源丰富,煤系地层Patchawarra组和Toolachee组为主力烃源岩层;发育多套河流-三角洲相河道砂体,Patchawarra组为主要储集层;下二叠统Murteree与Roseneath页岩层及下三叠统Arrabury地层形成油气藏的良好封闭。油气圈闭类型多样,已发现的油气多聚集在凹陷斜坡与隆起带的构造型圈闭中。盆地内生储盖配置良好,在挖潜构造型油气圈闭的同时,应将岩性-地层型圈闭列为后期油气勘探的重点。
引文
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