南黄海崂山隆起中南部海底渗漏烃类源区示踪与运移路径重建

Seabed hydrocarbon seepage areas will be enclosed by comprehensive research of seismic, sub-bottom profiling, side-scan sonar and geochemical data ,then core samples collection and organic geochemical analysis will be finished in south central Laoshan uplift of South Yellow Sea. The intense and genetic types ((biogenic and thermogenic) of seabed hydrocarbon seepage will be identified by the hydrocarbon gases（C1-C5）and their carbon isotopic , methane hydrogen isotopic , and high molecular weight hydrocarbons (C15+) and biomarkers. The source characteristics of thermogenic seepage hydrocarbons can be traced by selecting special parameters of saturated hydrocarbons and biomarkers. The migration pathways of thermogenic seepage hydrocarbons will be reconstructed and three-dimensional seepage model will be established by integration of seismic attribute evaluation, faults and trap analysis，and change of geochemical anomalies in south central Laoshan uplift of South Yellow Sea.. The project will acquired a series of geochemical indices for identifying seabed hydrocarbon seepage genetic types and tracing source characteristics, provide the petroleum systems analyst critical information about source (organic matter type), maturation (organic maturity), migration (migration pathway delineation) in south central Laoshan uplift of South Yellow Sea Basin. The results are not only the important guidance for exploration of oil and gas in South Yellow Sea, but also the important academic and factual sense for studying of worldwide seabed hydrocarbon seepages.

通过南黄海崂山隆起中南部已有地震、浅地层剖面、测扫声纳和地球化学勘查结果的综合分析，圈定可能的海底烃类渗漏区，进行海底沉积物柱状样品采集和有机地球化学指标的分析测试。利用烃类气体及其碳、氢同位素组成、饱和烃类（C15+）和生物标志物识别海底烃类渗漏强度、成因类型和源区特征。采用渗漏区地震属性分析、断裂和圈闭构造分析，与烃类地球化学异常变化相结合的方法重建热成因渗漏烃运移路径，给出南黄海崂山隆起中南部海底热成因烃类渗漏三维模型。. 本项目将获取有关南黄海盆地崂山隆起中南部含油气系统的关键信息，包括有机质类型、沉积环境、成岩时代、热成熟度和运移路径等，给出海底烃类渗漏成因类型识别和源区示踪的地球化学指标和热成因渗漏烃运移路径重建方法，不仅对于南黄海海域油气勘探具有重要指导意义，而且对我国相关海域和世界范围的海底烃类渗漏研究也具有重要的理论和实际意义。

通过对南黄海崂山隆起中南部海底沉积物有机地球化学样品采集、分析测试和异常提取，圈定了烃类气体和芳烃类地球化学异常，揭示了烃类地球化学异常与高石3构造深部油藏渗漏的成因联系，为这一地区油气勘探，特别是深部油气藏预测提供了地球化学依据。利用烃类气体分子及其碳、氢同位素组成，饱和烃类及生物标志物等指标参数，结合CSDP-2井岩心有机地球化学分析结果，识别出海底渗漏烃类的成因类型，获取了热成因渗漏烃类源区特征，包括有机质类型、沉积环境、成岩时代、热成熟度等关键信息。. 通过浅层和中深层地震属性分析、断裂及圈闭构造分析和烃类异常变化的综合研究，识别海底热成因渗漏烃空间分布和可能的运移路径。以烃类气体和芳烃类指标的双环状地球化学异常为基础，结合地震属性分析结果，重建了海底热成因烃类渗漏三维模型，从更深层次揭示了高石3构造深部油气藏的分布和活动特征，为钻探井位优选提供了地球化学研究依据。. 烃类气体渗漏实验模拟结果揭示了海底烃类渗漏过程中烃类气体含量和分子组成变化和两阶段渗漏模式，重建了烃类气体渗漏过程，为进一步认识南黄海崂山隆起高石3构造油气藏渗漏过程提供了实验依据。. 本项目研究建立的围绕南黄海崂山隆起高石3构造的海底烃类渗漏三维地球化学模型，以及给出的海底烃类渗漏成因类型识别和源区示踪的地球化学指标和热成因渗漏烃运移路径重建方法，不仅对于南黄海海域油气勘探具有重要指导意义，而且对我国相关海域和世界范围的海底烃类渗漏研究也具有重要的理论和实际意义。