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海拉尔盆地乌尔逊凹陷无机CO_2气储层的岩石学与碳氧同位素特征 被引量:41

Petrology and carbon-oxygen isotope of inorganic CO_2 gas reservoir in Wuerxun depression,Hailaer basin.
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摘要 海拉尔盆地乌尔逊凹陷无机 CO_2气储集砂岩中含有大量片钠铝石,是查明无机 CO_2气注入对砂岩的改造和形成的自生矿物组合的理想砂岩。通过偏光显微镜、扫描电镜、X-射线衍射分析和 MAT253稳定同位素质谱仪等,确定了含片钠铝石砂岩中的胶结物与自生矿物类型、成岩共生序列和引起片钠铝石形成的 CO_2的成因。CO_2气注入前形成的自生矿物组合主要为方解石、次生加大石英和高岭石,在次生加大石英形成过程中发生了第一期油气注入。CO_2气注入晚于第一期油气注入,CO_2气注入后形成的自生矿物组合主要为片钠铝石和铁白云石。第二期油气注入发生在 CO_2气注入后。片钠铝石的δ^(13)C 为-5.3~-1.5‰PDB,与片钠铝石平衡的δ^(13)C_(CO2),为-10.7~-7.0‰PDB,与海拉尔盆地 CO_2气的δ^(13)C_(CO2)值(-11.36~-8.02‰PDB)一致,表明形成片钠铝石的 CO_2和气藏中的 CO_2均来源于无机 CO_2与有机 CO_2混合背景,总体上以无机 CO_2为主。结合含片钠铝石砂岩与 CO_2气的分布都受控于深大断裂和γ5花岗岩的特点,CO_2气和形成片钠铝石的 CO_2绝大部分属于幔源-岩浆型。含片钠铝石砂岩中保存了 CO_2驱油的迹象。 he CO2 gas reservoir sandstone of Wuerxun Depression in Hailaer Basin, with abundance of dawsonite, provide a natural laboratory to study the alteration of CO2 on sandstone and the forming of authigenic mineral assemblage. The types, paragenetic sequence of cements and authigenic mineral and origin of CO2 forming dawsonite are investigated using palarizering microscope, scanning electron microscope, X-ray diffraction and MAT253 stable isotope mass spectrometer. Pre-CO2 minerals include calcite, quartz overgrowth and kaolinite. The first stage of oil and gas injected during the quartz overgrowth growing. CO2 injecting reservoir is later than the first stage of oil and gas. After CO2 influx, the main cements are dawsonite and ankerite. The second stage of oil and gas injected after CO2 influx. Dawsonite δ^13C values range from -5.3 to -1.5‰PDB. The calculated δ^13C values of CO2 gas in isotope equilibrium with dawsonite range from - 10.7 to - 7.0‰PDB, in coincidence with δ^13C values ( - 11.36 - - 8.02‰PDB) of inorganic CO2 gas in Hailaer Basin. These values indicate that CO2 both forming dawsonite and from gas reservoir originates from mixture background of inorganic and organic CO2, mostly from inorganic CO2. According to the fact that both sandstone within dawsonite and CO2 gas reservoir lie in the vicinity of deep fracture and γ5 granite, CO2 both from gas reservoir and forming dawsonite almost belong to type of mantle origin-magma. The sandstone within dawsonite preserved the evidence of oil displaced by CO2.
出处 《岩石学报》 SCIE EI CAS CSCD 北大核心 2006年第8期2229-2236,共8页 Acta Petrologica Sinica
基金 国家自然科学基金(批准号:40372060) 国家油气专项(批准号:XQ-2004-07)资助
关键词 海拉尔盆地 乌尔逊凹陷 无机CO2气 岩石学 碳氧同位素 片钠铝石 Hailaer basin, Wuerxun depression, Inorganic CO2 gas, Petrology, C-O isotope, Dawsonite
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