天然气运移有机-无机地球化学示踪指标——以四川盆地川西坳陷侏罗系气藏为例
发布时间：2018-08-26 11:59
【摘要】：以四川盆地川西坳陷侏罗系气藏作为研究实例,通过分析天然气组分和碳同位素组成特征,结合地层水化学特征、储集层中自生矿物碳、氧同位素组成以及流体包裹体特征,提出了C_1/C_2值、N_2含量、芳烃/烷烃值、甲烷碳同位素组成、地层水矿化度及水化学特征参数、储集层中自生方解石碳氧同位素组成、含烃盐水包裹体均一温度及盐度等指示天然气运移相态、运移方向和运移路径的有机-无机地球化学示踪指标,并对天然气的运移过程及机制进行了探讨。研究表明,川西坳陷中侏罗统天然气以水溶相运移为主,随着运移脱溶过程的进行表现出苯/烷烃值增大、甲烷碳同位素组成变重的趋势,同时具有气藏伴生地层水矿化度较低、含气砂岩中自生方解石的碳氧同位素组成偏轻、含烃盐水包裹体均一温度高且盐度较低等特征;上侏罗统天然气则以游离相运移为主。结合区域地质以及水溶气脱溶成藏过程中的相态演化等方面的研究,证明提出的有机-无机地球化学示踪指标可对川西坳陷侏罗系天然气的运移方向及路径进行有效的判识。
[Abstract]:Taking the Jurassic gas reservoirs in the western Sichuan depression as an example, the characteristics of natural gas composition and carbon isotopic composition, combined with the chemical characteristics of formation water, the carbon, oxygen isotopic compositions and fluid inclusions of authigenic minerals in the reservoir are analyzed. The contents of C_1/C_2, aromatic hydrocarbon / alkane number, methane carbon isotope composition, formation water salinity and hydrochemical characteristic parameters, and the carbon and oxygen isotopic composition of authigenic calcite in reservoir are presented. The homogenization temperature and salinity of hydrocarbon-bearing brine inclusions indicate the migration phase state, migration direction and migration path of natural gas by organic-inorganic geochemical tracer. The migration process and mechanism of natural gas are also discussed. The results show that the gas of the Middle Jurassic in the western Sichuan depression is mainly transported by water-soluble phase, and the carbon isotopic composition of methane becomes heavier with the increase of benzene / alkane number during the process of migration and desolation. At the same time, it is characterized by low mineralization degree of formation water associated with gas reservoir, light carbon and oxygen isotopic composition of authigenic calcite in gas-bearing sandstone, high homogenization temperature and low salinity of hydrocarbon brine inclusions, and free phase migration of natural gas in Upper Jurassic. Based on the study of regional geology and phase evolution in the process of water solution gas desolation, it is proved that the proposed organic-inorganic geochemical tracer index can effectively identify the migration direction and path of Jurassic natural gas in the western Sichuan depression.
【作者单位】： 中国石化西南油气分公司勘探开发研究院;中国地质调查局成都地质调查中心;
【基金】：国家科技重大专项“四川盆地碎屑岩层系油气富集规律与勘探评价”(2016ZX05002-004)
【分类号】：P618.13
本文编号：2204798
[Abstract]:Taking the Jurassic gas reservoirs in the western Sichuan depression as an example, the characteristics of natural gas composition and carbon isotopic composition, combined with the chemical characteristics of formation water, the carbon, oxygen isotopic compositions and fluid inclusions of authigenic minerals in the reservoir are analyzed. The contents of C_1/C_2, aromatic hydrocarbon / alkane number, methane carbon isotope composition, formation water salinity and hydrochemical characteristic parameters, and the carbon and oxygen isotopic composition of authigenic calcite in reservoir are presented. The homogenization temperature and salinity of hydrocarbon-bearing brine inclusions indicate the migration phase state, migration direction and migration path of natural gas by organic-inorganic geochemical tracer. The migration process and mechanism of natural gas are also discussed. The results show that the gas of the Middle Jurassic in the western Sichuan depression is mainly transported by water-soluble phase, and the carbon isotopic composition of methane becomes heavier with the increase of benzene / alkane number during the process of migration and desolation. At the same time, it is characterized by low mineralization degree of formation water associated with gas reservoir, light carbon and oxygen isotopic composition of authigenic calcite in gas-bearing sandstone, high homogenization temperature and low salinity of hydrocarbon brine inclusions, and free phase migration of natural gas in Upper Jurassic. Based on the study of regional geology and phase evolution in the process of water solution gas desolation, it is proved that the proposed organic-inorganic geochemical tracer index can effectively identify the migration direction and path of Jurassic natural gas in the western Sichuan depression.
【作者单位】： 中国石化西南油气分公司勘探开发研究院;中国地质调查局成都地质调查中心;
【基金】：国家科技重大专项“四川盆地碎屑岩层系油气富集规律与勘探评价”(2016ZX05002-004)
【分类号】：P618.13
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