应用岩石热解、有机碳、有机岩石学等烃源岩地球化学分析资料,对营尔凹陷下白垩统中沟组烃源岩特征进行研究,发现烃源岩有机碳含量高,平均值达1.51%,有机质类型以Ⅰ型和Ⅱ1型为主,镜质体反射率(Ro)分布在0.5%~1.04%之间,并结合沉积相、...应用岩石热解、有机碳、有机岩石学等烃源岩地球化学分析资料,对营尔凹陷下白垩统中沟组烃源岩特征进行研究,发现烃源岩有机碳含量高,平均值达1.51%,有机质类型以Ⅰ型和Ⅱ1型为主,镜质体反射率(Ro)分布在0.5%~1.04%之间,并结合沉积相、地层厚度,分析烃源岩平面展布特征,平面分布范围广,厚度最大达1 200 m;利用铸体薄片、常规压汞等岩心分析资料对储层特征进行研究,储集空间类型原生孔隙、次生孔隙均有发育,储集物性偏差,孔隙度平均值7.42%,渗透率平均值0.75 m D;应用饱和烃气相色谱、色谱质谱等实验分析数据,对烃源岩、原油的生物标志物特征进行分析,明确油气来源,认为原油来自本身烃源岩。研究表明:烃源岩品质好,有机质丰度高,有机质类型偏腐泥型,热演化程度处于低熟-成熟阶段,主要以生油为主,厚度中心分布在南、北2次凹;储层以扇三角洲砂岩和湖相碳酸盐岩为主,碳酸盐岩分布在酒参1-营参1井一带,物性属于致密-低孔低渗型,储集空间类型以次生孔隙为主;油气分布在碳酸盐岩发育段,具备源储一体的成藏特征。展开更多
Three abnormal overpressure zoes with a planar top at different depths occur in the Ying’er Depression in the Eastern Jiuquan Basin. The distance and the temperature difference between them are about 1 000 m and 30℃...Three abnormal overpressure zoes with a planar top at different depths occur in the Ying’er Depression in the Eastern Jiuquan Basin. The distance and the temperature difference between them are about 1 000 m and 30℃, respectively. The studies of sedimentary history, nature of formation water, variation of geothermal gradient and examination of thin sections, and the relationship between lithologic section and formation pressure show that there are conditions for formation of abnormal overpressure zones in the Ying’er Depression. Aquathermal pressuring and the overlying sediment load are main factors forming the abnormal overpressure zones. The study indicates that most of oil and gas in the Ying’er Depression accumulated in reservoirs above or under the seals or in the top of the compartments.展开更多
文摘应用岩石热解、有机碳、有机岩石学等烃源岩地球化学分析资料,对营尔凹陷下白垩统中沟组烃源岩特征进行研究,发现烃源岩有机碳含量高,平均值达1.51%,有机质类型以Ⅰ型和Ⅱ1型为主,镜质体反射率(Ro)分布在0.5%~1.04%之间,并结合沉积相、地层厚度,分析烃源岩平面展布特征,平面分布范围广,厚度最大达1 200 m;利用铸体薄片、常规压汞等岩心分析资料对储层特征进行研究,储集空间类型原生孔隙、次生孔隙均有发育,储集物性偏差,孔隙度平均值7.42%,渗透率平均值0.75 m D;应用饱和烃气相色谱、色谱质谱等实验分析数据,对烃源岩、原油的生物标志物特征进行分析,明确油气来源,认为原油来自本身烃源岩。研究表明:烃源岩品质好,有机质丰度高,有机质类型偏腐泥型,热演化程度处于低熟-成熟阶段,主要以生油为主,厚度中心分布在南、北2次凹;储层以扇三角洲砂岩和湖相碳酸盐岩为主,碳酸盐岩分布在酒参1-营参1井一带,物性属于致密-低孔低渗型,储集空间类型以次生孔隙为主;油气分布在碳酸盐岩发育段,具备源储一体的成藏特征。
文摘Three abnormal overpressure zoes with a planar top at different depths occur in the Ying’er Depression in the Eastern Jiuquan Basin. The distance and the temperature difference between them are about 1 000 m and 30℃, respectively. The studies of sedimentary history, nature of formation water, variation of geothermal gradient and examination of thin sections, and the relationship between lithologic section and formation pressure show that there are conditions for formation of abnormal overpressure zones in the Ying’er Depression. Aquathermal pressuring and the overlying sediment load are main factors forming the abnormal overpressure zones. The study indicates that most of oil and gas in the Ying’er Depression accumulated in reservoirs above or under the seals or in the top of the compartments.
