苏北盆地上白垩统泰州组油气成藏期综合分析  

Comprehensive analysis on hydrocarbon accumulation period of Upper Cretaceous Taizhou Formation in Subei Basin

作　　者：宋宁[1,2] 王铁冠[3] 陈莉琼[2] 辛仁臣[1] 

机构地区：[1]中国地质大学海洋学院,北京100083 [2]中国石化江苏油田地质科学研究院,江苏扬州225000 [3]中国石油大学油气资源与探测国家重点实验室,北京102249

出　　处：《石油学报》2010年第2期180-186,195,共8页Acta Petrolei Sinica

基　　金：中国石油化工股份有限公司科技攻关项目(P05004)“苏北盆地泰州组成烃条件研究”部分成果

摘　　要：苏北盆地是中国东部唯一在上白垩统泰州组发现烃源岩的盆地,对其成藏期的研究是油气成藏模式和富集规律研究的重要内容。对其中东部上白垩统泰州组的埋藏史、热演化史和生烃史进行了数值模拟,对48件储层样品的流体包裹体岩相特征进行了观察及均一温度测定分析。研究认为,泰州组经历持续沉降—短暂抬升—再沉降的过程,发育3期烃类包裹体,而抬升和沉降幅度的差异导致不同凹陷和同一凹陷不同部位生烃和成藏期的差异。海安凹陷泰州组从始新世三垛末期至现今大量生烃,油气在上新世盐城期开始连续充注成藏。高邮凹陷泰州组从古新世阜宁末期到始新世三垛末期大量生烃,油气在始新世三垛期开始连续充注成藏,较海安凹陷早。油气主要成藏期与烃源岩大量生排烃期和圈闭形成时间匹配,有利于该区油气充注成藏。Hydrocarbon accumulation period is the important content for researching the reservoir-forming pattern and hydrocarbon enrichment laws.The hydrocarbon source rock of the Upper Cretaceous Taizhou Formation in Subei Basin was only discovered in the eastern China at present.The history of burial,thermal evolution and hydrocarbon generation in the Upper Cretaceous Taizhou Formation were simulated.The fluid inclusions of 48 samples from the reservoirs in Taizhou Formation were investigated on the observation of lithofacie features and homogeneous temperature.The results showed that hydrocarbon source rock in Taizhou Formation experienced the continual subside-briefly lifting-secondary subside period.The divergences of hydrocarbon generation history and hydrocarbon accumulation period between Hai＇an Sag and Gaoyou Sag were caused by the difference of subsides and lifting amplitudes.In Hai＇an Sag,hydrocarbon of Taizhou Formation was generated from the Late Eocene Sanduo Period to the Quaternary and continuously charged and massively accumulated in the Pliocene Yancheng and Quaternary periods.Hydrocarbon of Taizhou Formation in Gaoyou Sag was generated from the Late Palaeocene Funing Period to the Eocene Sanduo Period and continuously charged and massively accumulated from the Eocene Sanduo Period to the Quaternary.The main charging timing of reservoirs matches with hydrocarbon generation and exclusion periods,which is favorable for petroleum accumulation in these areas.

关 键 词：苏北盆地 泰州组 白垩系 成藏期 流体包裹体 热演化 

分 类 号：TE122.1[石油与天然气工程—油气勘探]