倪云燕1,2,廖凤蓉1,2,姚立邈1,2,高金亮1,2,张蒂嘉1,2
Ni Yun-yan1,2,Liao Feng-rong1,2,Yao Li-miao1,2,Gao Jin-liang1,2,Zhang Di-jia1,2
摘要: 通过对四川盆地川中地区须家河组天然气的组分和碳氢同位素分析,结合前人对川西和川南地区须家河组及四川盆地其他层系天然气研究成果和区域地质背景,开展天然气成因和来源、氢同位素特征与指示意义等研究。结果表明,川中地区须家河组天然气以烃类气体为主,甲烷含量为67.89%~98.05%,重烃气(C2+)含量为0.42%~16.62%,非烃气体(CO2、N2)含量较低,除岳121井N2和CO2含量较高外,N2含量平均值为0.82%,CO2含量平均值为0.26%。元坝须家河组天然气干燥系数平均高达0.991,为干气;川中其他地区须家河组天然气干燥系数皆小于0.95,为湿气。天然气δ13C1值介于-43.8‰~-29.2‰之间,δ13C2值介于-33.5‰~-20.7‰之间,δ13C3值介于-33.6‰~-19.3‰之间,δ13C4值介于为-27.2‰~-22.2‰之间;天然气δD1值介于-191‰~-148‰之间,δD2值介于-165‰~-115‰之间,δD3值介于-153‰~-107‰之间。甲烷及其同系物(C2-4)基本上为碳氢同位素正序排列(δ13C1<δ13C2<δ13C3<δ13C4、δD1<δD2<δD3),与典型的有机成因烷烃气碳氢同位素特征一致。元坝须家河组天然气成熟度RO值为1.09%~1.78%,川中其他地区须家河组天然气成熟度RO值为0.64%~0.92%。川中须家河组天然气主要为来自须家河组煤系源岩的煤成气,元坝须二段天然气为来自须家河组煤系源岩的高成熟煤成气混入下寒武统(及下志留统)原油裂解气的混合气。四川盆地须家河组天然气甲烷δD值偏高,都大于-200‰。与来自淡水湖沼相烃源岩的吐哈盆地台北凹陷的煤成气相比,尽管两者成熟度相近,但甲烷δD值差异高达90‰,说明须家河组煤系源岩形成于水体咸化的沉积环境。
中图分类号:
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