煤成气轻烃地球化学特征及其影响因素——以四川盆地须家河组为例

被引:30
作者
胡国艺 [1 ,2 ]
汪为胜 [3 ]
廖凤蓉 [1 ,2 ]
机构
[1] 中国石油勘探开发研究
[2] 中国石油油气地球化学重点实验室
[3] 江苏油田试采二厂
关键词
煤成气; 轻烃组分; 单体烃碳同位素; 成因类型; 四川盆地;
D O I
暂无
中图分类号
P618.13 [石油、天然气];
学科分类号
070403 [天体物理学];
摘要
轻烃在天然气中含量虽低,但因其含有丰富的地球化学信息,在天然气成因等研究方面引起了关注。作者以四川盆地须家河组煤成气和雷三段油型气为例,采用GC和GC-IR-MS技术对煤成气轻烃的地球化学分布特征及其影响因素进行了系统分析。煤成气C7轻烃组成具有甲基环己烷分布优势,在甲基环己烷、正庚烷和二甲基环戊烷相对组成中,甲基环己烷含量最高,分布在48%~73%,平均为63.9%,煤成气轻烃单体烃碳同位素重,δ13C分布在-25.1‰~-20.0‰之间,大部分分布在-23.0‰~-21.0‰。轻烃的分布受到多种因素影响,天然气成熟度对轻烃中芳烃含量变化影响复杂,在成熟和高成熟阶段,天然气轻烃中芳烃含量低,成熟度对芳烃的含量影响较小,而在过成熟阶段,芳烃含量高,成熟度对芳烃含量影响大。通过凝析油和天然气轻烃组成对比,蒸发分馏作用对热演化参数Ctemp和庚烷值、甲苯/正庚烷等影响较大,但对成因类型参数如(2-MH+2,3-DMP)/C7与(3-MH+2,4-DMP)/C7,P2/C7与N2/P3,正庚烷、甲基环己烷和二甲基环戊烷相对含量关系等影响小。天然气成因类型对轻烃Mango参数K1值、正庚烷、甲基环己烷和二甲基环戊烷相对含量关系以及轻烃单体烃碳同位素影响大,因此,可以利用这些参数进行天然气成因类型判识。
引用
收藏
页码:905 / 916
页数:12
相关论文
共 19 条
[1]
Stable carbon isotopes of alkane gases from the Xujiahe coal measures and implication for gas-source correlation in the Sichuan Basin, SW China [J].
Dai, Jinxing ;
Ni, Yunyan ;
Zou, Caineng ;
Tao, Shizhen ;
Hu, Guoyi ;
Hu, Anping ;
Yang, Chun ;
Tao, Xiaowan .
ORGANIC GEOCHEMISTRY, 2009, 40 (05) :638-646
[2]
Geochemical features of light hydrocarbons of typical salt lake oils sourced from Jianghan Basin, China [J].
Wang Peirong ;
Zhang Dajiang ;
Xu Guanjun ;
Xiao Tingrong ;
Song Fuqing ;
Cai Bing .
ORGANIC GEOCHEMISTRY, 2008, 39 (11) :1631-1636
[3]
Preliminary study on the origin identification of natural gas by the parameters of light hydrocarbon [J].
GuoYi Hu ;
Jian Li ;
Jin Li ;
ZhiSheng Li ;
Xia Luo ;
QingWu Sun ;
ChengHua Ma .
Science in China Series D: Earth Sciences, 2008, 51 :131-139
[4]
Natural gas origins of large and medium-scale gas fields in China sedimentary basins [J].
ShuiChang Zhang ;
GuangYou Zhu .
Science in China Series D: Earth Sciences, 2008, 51 :1-13
[5]
Discussion of gas enrichment mechanism and natural gas origin in marine sedimentary basin; China.[J].GuangYou Zhu;WenZhi Zhao;ShuiChang Zhang;YingBo Liang;ZhengJun Wang.Chinese Science Bulletin.2007, 1
[6]
Stable carbon isotope compositions and source rock geochemistry of the giant gas accumulations in the Ordos Basin, China [J].
Dai, JX ;
Li, J ;
Luo, X ;
Zhang, WZ ;
Hu, GY ;
Ma, CH ;
Guo, JM ;
Ge, SG .
ORGANIC GEOCHEMISTRY, 2005, 36 (12) :1617-1635
[7]
The effect of minor to moderate biodegradation on C5 to C9 hydrocarbons in crude oils [J].
George, SC ;
Boreham, CJ ;
Minifie, SA ;
Teerman, SC .
ORGANIC GEOCHEMISTRY, 2002, 33 (12) :1293-1317
[8]
The origin of light hydrocarbons [J].
Mango, FD .
GEOCHIMICA ET COSMOCHIMICA ACTA, 2000, 64 (07) :1265-1277
[9]
Carbon and hydrogen isotope systematics of bacterial formation and oxidation of methane.[J].Michael J. Whiticar.Chemical Geology.1999, 1
[10]
Mixed signals of the source and thermal maturity for petroleum accumulations from light hydrocarbons: an example of the Beryl field.[J].H. Moses Chung;Clifford C. Walters;Steven Buck;Gail Bingham.Organic Geochemistry.1998, 1