中文摘要：

通过流体包裹体岩相学观察,分析了民丰洼陷深层天然气储层流体包裹体的类型、形态、产状、颜色等特征。烃类包裹体镜下特征显示民丰洼陷深层天然气的油气演化程度达到高成熟度阶段,而烃类包裹体拉曼光谱分析表明民丰洼陷深层天然气成藏过程可能与富甲烷烃类流体有关。基于油—水共生包裹体体系中盐水包裹体的测温分析,结合民丰洼陷埋藏史和热史分析,认为民丰洼陷深层天然气有两个成藏期。第一期成藏主要在东营期,但贡献不大;第二期成藏时间主要集中在明化镇期。第二期成藏对最终的天然气藏具有主要贡献,成藏时间主要集中在距今10M a之后。储层包裹体拉曼光谱分析结果显示,烃类流体与二氧化碳流体共存,证实天然气成藏过程中存在酸性流体。由于酸性流体溶蚀了早期成岩形成的方解石胶结物,从而使得民丰洼陷深层储层次生孔隙发育,有利于天然气成藏。

英文摘要：

Through observation of petrological characteristics of fluid inclusions under microscope,the types,shapes,occurrence and colors of fluid inclusions in deep natural gas reservoirs in Minfeng sub-sag,Dongying sag were described in this paper.The characteristics of hydrocarbon-bearing inclusions indicate that evolution of oil and gas in Minfeng area reached high maturity stage.The Raman spectra of hydrocarbon-bearing inclusions imply that the accumulation of deep natural gas in Minfeng sub-sag may be relative to methane-rich hydrocarbon fluids.Based on the micro-thermometry analysis of aqueous inclusions which co-exist with hydrocarbon-bearing inclusions and reconstruction of burial and thermal history,there were two oil/gas entrapment stages were divided in Minfeng sub-sag.The first stage mainly occurred during Oligocene Dongying Period,but having not too much contribution.The second accumulation mainly occurred in Pliocene Minghuazhen Period.The latter is the main accumulation period,and mostly occurred smaller than 10 Ma.The analysis of Raman spectroscopy show that hydrocarbon-bearing fluids co-exist with carbon dioxide in fluid inclusions in deep natural gas reservoirs,confirming that there were acid fluids existed during the accumulation of natural gas.Acid fluids can dissolve calcite cement formed in early diagenesis,consequently improving the growth of induced porosity in deep reservoirs and favor the accumulation of natural gas.