摘要
为了详细了解民丰洼陷深层天然气地球化学成因,指导该区深层天然气勘探,对东营凹陷民丰洼陷深层天然气地质背景、烃源岩有机质性质、成熟度及生物标志化合物等地球化学特征进行了分析,证实东营凹陷民丰洼陷沙四段烃源岩为成熟度较高的烃源岩。结合有机包裹体等、C_2及C_3同位素含量及相对物质的量比、轻烃指数及碳同位素对比分析该区深层天然气地球化学成因。结果表明,沙四段下亚段暗色泥岩为成熟度较高的气源岩,民丰洼陷深层天然气是高成熟阶段早期生成的油型高成熟气。丰深1井气藏证实了民丰洼陷沙四段源岩可以生烃并形成工业油气藏,且民丰洼陷深层天然气有较大的勘探潜力。
To discover geochemical genesis of deep buried natural gas in Minfeng Sag,analysis was made on aspects of geological setting and geochemical features of organic matter type,maturity and biomarker. The research indicates that it is highly mature hydrocarbon source rocks of the fourth member of Shahejie formation (Es_4) in Minfeng Sag.Combined with the analysis of carbon isotope correlation,value of C_2/C_3,light hydrocarbon index and enclosures, it is pointed out that the organic metamorphism degree of Es_4 gas source rocks is high,the deep buried natural gas in Minfeng Sag is the oil-related gas generated at early phase of the high mature period of the source rock.Fengshengl gas reservoir approves that the lower of Es_4 source rocks can generate hydrocarbon and afford commercial gas reservoir,and the exploration potential for deep buried gas is remarkable in Minfeng Sag.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2009年第2期36-38,共3页
Petroleum Geology and Recovery Efficiency
基金
中国石化重点科技攻关项目"山东探区大中型气田形成条件及勘探目标评价"(P04025)
关键词
裂解气
地球化学
烃源岩
有机包裹体
民丰洼陷
pyrolysis gas
geochemistry
source rock
organic enclosure
Minfeng Sag
