冉逸轩,周翔
RAN Yixuan,ZHOU Xiang

• 1:东北石油大学地球科学学院
• 2:大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

随着松辽盆地非常规天然气勘探的深入,徐家围子断陷沙河子组致密气成为盆地深层天然气勘探新的热点并不断取得突破。为明确沙河子组致密气成因和分布规律,综合天然气组分、稳定碳同位素、包裹体测温等多种手段,对沙河子组致密气地球化学特征和成藏期次进行分析。结果表明:沙河子组天然气以甲烷为主,重烃含量低,普遍含有少量N_2和CO_2,其中δ~(13)C_1分布范围较大,为-33.24‰～-18.00‰,δ~(13)C_2偏重且分布相对集中,为-26.90‰～-15.26‰;碳同位素分布总体呈正序列,部分样品出现δ~(13)C_2大于δ~(13)C_3的倒转现象;沙河子组烃类气为煤型气,存在青山口组末期、嫩江组时期2次成藏过程,嫩江组期生成的高成熟度煤型气与青山口组末期相对低成熟度煤型气的混合是造成烃类气中δ~(13)C_2大于δ~(13)C_3的主要原因;CO_2为无机成因气,分布在基底断裂附近,是营城期火山活动时岩浆脱气作用的产物。
Along with the deepening of the unconventional natural gas exploration in North Songliao Basin, the tight gas in Shahezi Formation has become the new hot spot and continuously made breakthroughs in the gas exploration of the deep layers in the basin. In order to ensure the genesis and distribution law of the natural gas, by means of combining the natural gas compositions, stable carbon isotopes, inclusion homogenization temperature and so on, the geochemical characteristics and accumulation period-time of the natural gas were analyzed. The results show that Shahezi-Formation natural gas is mainly dominated by methane, contains a bit of heavy hydrocarbons at the same time and generally contains small amount of N_2 and CO_2. In detail, there is a wide distribution of δ~(13)C_1 i.e. between-33.24‰ and-18.00‰, while the value of δ~(13)C_2 is heavier and have a relatively intensive distribution i.e. from-26.90‰ to-15.26‰; the carbon isotopic distribution of the natural gas is characterized by positive sequence, there are reversal phenomena of δ~(13)C_2>δ~(13)C_3 for partial samples; the natural gas in Shahezi Formation belongs to coal-generated gas and there are two accumulation periods and times such as in Late Qingshankou period and Nenjiang Formation, the mix of high-maturity coal-generated gas in Nenjiang period and relatively low maturity coal-generated gas in Late Qingshankou period is the major cause of the reversal phenomena; the CO_2 is generated by inorganic origin and distributed nearby the basement faults, which is the product of the magma outgassing in Yingcheng-period volcanic activities.

关键词(KeyWords)： 致密气;碳同位素;天然气地球化学特征;沙河子组;松辽盆地北部
tight gas;carbon isotope;natural gas geochemical characteristic;Shahezi Formation;North Songliao Basin

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“致密气富集规律、资源潜力评价与有利目标优选”(2016ZX05047-001);; 中国石油天然气股份有限公司重大科技专项“大庆油气持续有效发展关键技术研究与应用”(2016E-02)

作者(Author): 冉逸轩,周翔
RAN Yixuan,ZHOU Xiang

DOI: 10.19597/j.issn.1000-3754.201905008

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