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首页> 外文期刊>Journal of natural gas science and engineering >New insight into origin, accumulation and escape of natural gas in the Songdong and Baodao regions in the eastern Qiongdongnan basin, South China Sea
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New insight into origin, accumulation and escape of natural gas in the Songdong and Baodao regions in the eastern Qiongdongnan basin, South China Sea

机译：南海东琼南盆地东部和宝涛地区天然气起源，积累和逃逸的新洞察力

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摘要

The found gas pools in the Songdong and Baodao regions in the eastern Qiongdongnan basin, South China Sea have almost failed to realize expected commercial value due to either low reserve abundance or high carbon dioxide (CO2) content. To assist in further exploration, the genetic type, source and accumulation history of natural gas have been investigated based on the analysis of the chemical compositions, carbon isotopes and light hydrocarbons in gases, isotope compositions of rare gas, basin numerical modeling and fluid inclusion analysis. The results indicate that there are three representative types of gases. The first type distributed in the BD13 and ST24-1 areas consists of biogenic and oil-derived gases from the Songdong sag. The second type distributed in the BD19-2 area is composed of coal-derived and oil-derived gases from the Baodao sag. The third type distributed in the BD15-3, BD19-4 and BD19-2 areas consists of significant amounts of volcanic mantle-derived CO2 and few organic hydrocarbon gases. The charge of oil-derived gas and formation of biogenic gas are close to the deposition stage of overlying thick mudstones. This may be a critical factor for current gas pools with low reserve abundance in the Songdong region. Intense activity of the No.2 fault and absence of overlying thick mudstones gave rise to the escape of a large quantity of oil and gas from the middle Oligocene to middle Miocene. Besides, due to volcanic activity in the Quaternary, mantle-derived CO2 was injected into the reservoirs via No.2 fault. The previous accumulative hydrocarbon gases were driven off by CO2 in various degrees, which may be mainly responsible for current situation that most gas pools have high CO2 content in the Baodao region.
机译：南海东琼南盆地东部和宝涛地区的发现天然气池几乎未能实现预期的商业价值，因为低储备丰富或高碳二氧化碳（CO2）含量。为了进一步探索，研究了天然气的遗传类型，天然气的累积史，基于对气体中的化学成分，碳同位素和轻质烃，稀有气体的同位素组成，盆地数值模拟和流体包涵体分析的分析。结果表明有三种代表性的气体。分布在BD13和ST24-1区域中的第一类由来自宋东凹陷的生物和油源的气体组成。分布在BD19-2区域中的第二种类型由来自Baodao SAG的煤衍生的和油衍生的气体组成。分布在BD15-3，BD19-4和BD19-2区域中的第三种类型由大量的火山型衍生CO 2和少量有机烃气体组成。油源气体的电荷和生物气体的形成接近覆盖厚泥岩的沉积阶段。这可能是宋东地区具有低储备丰富的当前气池的关键因素。 No.2故障和缺乏覆盖的厚泥岩的强烈活动使得从中间寡烯中的大量石油和天然气的逃脱。此外，由于第四纪中的火山活性，通过2号故障将搭桥衍生的二氧化碳注入储层。之前的累积烃气体被CO 2在各种程度上被驱动，这主要负责大多数气体池在Baodao区域中具有高CO2含量的情况。

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