收稿日期: 2005-05-15
修回日期: 2005-06-22
网络出版日期: 2005-08-20
基金资助
国家自然科学基金项目(编号：40238060)；中国海洋石油总公司重点项目联合资助.
NATURAL GAS ORIGINES AND GAS SOURCE STUDIES OF PANYULOW UPLIFT IN PEAR RIVER MOUTH BASIN
Received date: 2005-05-15
Revised date: 2005-06-22
Online published: 2005-08-20
指出:珠江口盆地番禺低隆起天然气组成差异较大,既有烃类含量很高的纯烃气藏,也有无机成因的二氧化碳气藏和高含氮气藏;天然气乙烷碳同位素值绝大多数小于-28‰,以混合气和油型气为主;甲烷碳同位素值介于-44.2‰～-33.6‰之间,C2+含量介于4.76%～10.98%之间,C1/(C2+C3)值介于6.28～21.44之间,大多属于高成熟―过成熟天然气;与天然气相伴生的高成熟凝析油具有较高的Pr/Ph值(2.58～6.38),双杜松烷有一定丰度,C304-甲基甾烷含量低,来自于恩平组烃源岩。利用ln(C1/C2)―ln(C2/C3)和(δ13C2-δ13C3)―ln(C2/C3)图版,结合油-气-岩的综合分析,认为番禺低隆起天然气以来自于恩平组烃源岩干酪根裂解气为主,以原油裂解气和文昌组烃源岩晚期干酪根裂解气为辅。
朱俊章;施和生;庞雄;秦成岗;高鹏 . 珠江口盆地番禺低隆起天然气成因和气源分析[J]. 天然气地球科学, 2005 , 16(4) : 456 -459 . DOI: 10.11764/j.issn.1672-1926.2005.04.456
The component of natural gases of Panyu low uplift in Pear River Mouth Basin exists obvious difference, including pure hydrocarbon gas reservoirs, inorganic formed CO -2 gas reservoirs and high N~2 content gas reservoirs. The carbon isotope value of ethane of most natural gases is less than -28‰, belonging to mixed gas and oil-type gas. The carbon isotope value of methane is between -44.2‰~ -33.6‰ , C~ 2 + is between 4.76%~10.98%, the ratio value of C -1/(C -2+C -3) is between 6.28~21.44.
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