琼东南盆地宝岛凹陷天然气差异聚集主控因素与成藏模式
Main Controlling Factors of Natural Gas Differential Accumulation Model,in Baodao Sag, Qiongdongnan Basin
宝岛凹陷的烃源分布和天然气成藏主控因素不清,制约勘探突破. 综合应用构造解析、烃源识别、源-汇体系及成藏综合分析技术,明确宝岛凹陷差异构造演化控制下的主力供烃灶、有利储盖层及差异成藏主控因素. 研究表明,宝岛凹陷早渐新世属“非典型” 双断,断阶带崖城组烃源岩厚度大,形成南、北两个洼陷群;北坡洼陷群主要受多条北东向早期断裂控制,形成多个转换断阶带,部分北东向断裂活动性强,导致其下降盘远端翘倾抬升形成低凸起;北东向转换断阶带+低凸起控制了古近系扇三角洲、三角洲砂岩及崖城组陆源海相烃源岩的分布,成为天然气聚集的主要场所. 基于不同构造样式控制下的天然气运聚条件分析,建立了 “转换断阶带渐新统近源高效汇聚型”、“凹陷带中新统海底扇有限聚集型”两种成藏模式,明确转换断阶带渐新统三角洲构造-岩性复合圈闭是大气田勘探的突破方向.
非典型断陷 / 转换断阶带 / 天然气差异聚集 / 成藏主控因素 / 成藏模式 / 石油地质
atypical fault depression / transform fault terrace belts / gas differential accumulation / main controlling factors of play / play model / petroleum geology
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俯冲带深部过程与非生物成气(2019YFA0708500)
中国东部非生物气富集与成藏机理
南海深水盆地油气运聚成藏分析与突破方向(KJGG2022-0103)
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