【摘要】 莺歌海盆地是中国南海北部海域重要的高温超压含油气盆地，乐东区黄流组砂岩储层致密，成岩作用较强，气藏具有低孔、低渗、低含气饱和度及异常高压的特点，流体包裹体记录了油气充注时的古流体信息，能够为油气成藏时间及成藏规律研究提供科学依据。通过对莺歌海盆地乐东10-1区黄流组砂岩样品进行镜下包裹体显微岩相学观察、包裹体类型与成分分析、包裹体均一温度与盐度测定等，研究黄流组砂岩储层的成岩特征及油气包裹体发育特征，结合其他地质条件综合分析油气成藏期次。结果表明：乐东10-1区黄流组砂岩成岩先后顺序主要为次生加大石英、方解石（白云石）胶结物；黄流组砂岩储层中包裹体比较发育，主要沿切穿石英颗粒及加大边微裂隙成带状分布、或碳酸岩胶结物中分布，以纯CH₄、CH₄和CO₂的混合成分为主；砂岩成岩期后主要有两期天然气充注过程，与天然气伴生的含烃盐水包裹体均一温度相差不大，LD10-1-A井黄流组均一温度主要分布在160～165℃和高于175℃,这与该区生烃时间较晚、晚期流体持续充注以及晚期底辟幕式活动有关系，结合构造演化史、埋藏史及生烃史等分析，乐东10-1区黄流组油气成藏时间普遍较晚，主要为±1.4 Ma和0.9 Ma至今。更多还原

【Abstract】 The Yinggehai Basin is an important high temperature and overpressure oil-bearing basin in the northern part of South China Sea. The sandstone reservoir of the Huangliu Formation in the Ledong area is of tight lithology and strong diagenesis. The gas reservoir was characterized by low porosity, low permeability, low gas saturation and abnormally high pressure. Fluid inclusion records the paleo-fluid information of oil and gas charging, which can provide scientific evidence for the study of oil and gas accumulation period. According to microscopic lithography observation, the types and composition analysis, homogenization temperature and salinity measurement of fluid inclusions for the Huangliu Formation sandstone samples, the diagenetic characteristics and hydrocarbon inclusion characteristics of the reservoir in the Ledong 10-1 area, Yinggehai Basin were researched. Combined with other geological conditions, oil and gas accumulation periods were comprehensively analyzed. The results show that the diagenetic sequence of sandstone is secondary enlarged quartz and calcite（dolomite） cements. Fluid inclusions are well developed in sandstone reservoirs, mainly distributed along the microcracks cutting through quartz particles and secondary enlarged edge, or distributed in carbonate cements. The composition is mainly of pure CH₄ or a mixture of CH₄ and CO₂ by laser Raman spectra. There are two periods of natural gas charging after diagenesis, and the difference of homogenization temperature from hydrocarbon-bearing saline inclusions associated with natural gas is not great. The homogenization temperature of well LD10-1-A is mainly in the range of 160～165 ℃ and higher than 175 ℃, which is related to the late hydrocarbon generation, continuous charging and late episodic diapir activity. Based on the analysis of tectonic evolution history, burial history and hydrocarbon generation history, the oil and gas accumulation time of the Huangliu Formation in Ledong 10-1 area is generally late, mainly ±1.4 Ma and 0.9 Ma up to now.更多还原