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在同一盆地中并不是所有成藏条件相似的火山岩体都能够成藏,有的因为火山岩体储集空间不发育而未能成藏,有的因为缺乏必要的盖层条件而难以成藏。以长岭凹陷营城组火山岩体成藏研究为例,系统解剖了不同构造部位所钻遇的火山岩体,分析了这些火山岩体盖层的岩性与油气成藏的关系,进而研究了盖层的体系域构成。只有低位体系域和湖扩张体系域的泥岩直接覆盖的火山岩体才能成藏,而低位体系域、湖扩张体系域和高位体系域形成的砂体所覆盖的火山岩体,因缺乏有效盖层而难以成藏。因此,在进行火山岩体储层发育预测研究的同时,还应开展火山岩体盖层体系域构成分析,进一步落实火山岩圈闭的有效性,以提高勘探的成功率。
In the same basin, not all volcanic rocks with similar reservoir forming conditions can accumulate. Some may not accumulate because of the lack of reservoir space for volcanic rock masses. Some may not be able to accumulate because of the lack of necessary capping conditions. Taking the formation of volcanic rocks in Yingcheng Formation of Changling Depression as an example, volcanic rocks encountered in different tectonic parts were systematically dissected. The relationship between the lithology of these volcanic cap rocks and hydrocarbon accumulation was analyzed. Of the system domain composition. Only the volcanic rocks directly covered by mudstone in the lower system tract and the lake expanse system tract can accumulate. However, the volcanic rocks covered by the sand body formed by the lowstand system tract, the lake expanse system tract and the highstand system tract are hard to be formed due to lack of effective caprock Accumulation. Therefore, while studying the prediction of volcanic reservoir development, we should also make a systematic analysis of the volcanic body caprock system tract to further validate the volcanic trap to improve the success rate of exploration.