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在世界各地古老的浅海三角洲体系和陆相河湖三角洲体系中,均已证明存在着巨大的石油天然气聚集。现代三角洲普遍发现浅层天然气显示,曾一度作为油气评价的依据之一。然而,这类显示并不一定与深部油气存在着成因联系,它更多地是属于现代沉积有机质生物化学降解的产物。长江三角洲区由于其优越的沉积环境,浅层天然气十分发育,自一九五八年起进行广泛的普查和开采利用,直至近期仍在打井采气,已成为农村能源的一部分。因此,进一步研究浅层天然气的分布规律,科学的总结和改善钻井、完井方法,更多地注意30米以下的深部浅层气,估算潜在的储量,作出规划,有可能使之成为农村能源的一个稳定组成部分。本文的目的在于介绍长江三角洲浅层天然气一般地质情况,以期得到进一步讨论,使浅层天然气能够在农业生产和农村生活中发挥更多的作用。
In ancient systems of the shallow sea delta and continental rivers and lakes and deltaic systems all over the world, huge accumulation of oil and gas has been proved. The discovery of shallow gas commonly found in the modern delta has been used as a basis for oil and gas evaluation. However, this type of display is not necessarily causally related to deep hydrocarbon, and it is more of a product of the biochemical degradation of modern sedimentary organic matter. Due to its superior sedimentary environment, the shallow natural gas in the Yangtze River Delta Region has developed very well. Since 1958, extensive census and exploitation have been carried out and the gas wells are still being drilled well recently and have become part of rural energy resources. Therefore, further study of the distribution of shallow gas, scientific summary and improvement of drilling, completion methods, pay more attention to deep shallow gas below 30 meters, to estimate the potential reserves, make plans, it may make it a rural energy A stable part of it. The purpose of this paper is to introduce the general geological conditions of the shallow gas in the Yangtze River Delta with a view to further discussion so that the shallow gas can play more roles in agricultural production and rural life.