【摘要】：以四川盆地川西坳陷侏羅系氣藏作為研究實(shí)例,通過(guò)分析天然氣組分和碳同位素組成特征,結(jié)合地層水化學(xué)特征、儲(chǔ)集層中自生礦物碳、氧同位素組成以及流體包裹體特征,提出了C_1/C_2值、N_2含量、芳烴/烷烴值、甲烷碳同位素組成、地層水礦化度及水化學(xué)特征參數(shù)、儲(chǔ)集層中自生方解石碳氧同位素組成、含烴鹽水包裹體均一溫度及鹽度等指示天然氣運(yùn)移相態(tài)、運(yùn)移方向和運(yùn)移路徑的有機(jī)-無(wú)機(jī)地球化學(xué)示蹤指標(biāo),并對(duì)天然氣的運(yùn)移過(guò)程及機(jī)制進(jìn)行了探討。研究表明,川西坳陷中侏羅統(tǒng)天然氣以水溶相運(yùn)移為主,隨著運(yùn)移脫溶過(guò)程的進(jìn)行表現(xiàn)出苯/烷烴值增大、甲烷碳同位素組成變重的趨勢(shì),同時(shí)具有氣藏伴生地層水礦化度較低、含氣砂巖中自生方解石的碳氧同位素組成偏輕、含烴鹽水包裹體均一溫度高且鹽度較低等特征;上侏羅統(tǒng)天然氣則以游離相運(yùn)移為主。結(jié)合區(qū)域地質(zhì)以及水溶氣脫溶成藏過(guò)程中的相態(tài)演化等方面的研究,證明提出的有機(jī)-無(wú)機(jī)地球化學(xué)示蹤指標(biāo)可對(duì)川西坳陷侏羅系天然氣的運(yùn)移方向及路徑進(jìn)行有效的判識(shí)。
[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.
【作者單位】： 中國(guó)石化西南油氣分公司勘探開(kāi)發(fā)研究院;中國(guó)地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心;
【基金】：國(guó)家科技重大專(zhuān)項(xiàng)“四川盆地碎屑巖層系油氣富集規(guī)律與勘探評(píng)價(jià)”(2016ZX05002-004)
【分類(lèi)號(hào)】：P618.13

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