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松辽盆地白垩纪发育六大物源及11条主要水系,但对是否存在东部物源一直存在很大的争议。通过对分析化验、钻井及露头等资料的综合研究,在东南隆起带发现一支来自榆树方向的水系并命名为榆树水系。研究表明,榆树水系母岩来源于张广才岭印支期及加里东期花岗岩,该水系从泉头组到嫩江组一致继承性发育,主要以河流和三角洲沉积为主。榆树水系的发现彻底改变了前人关于松辽盆地东部无物源及无水系的认识。因此,这一发现为在松辽盆地东部寻找石油天然气储层开辟了新的领域,具有极为重要的石油地质意义。
There are six major sources of Cretaceous development in the Songliao Basin and eleven major water systems. However, there is much controversy over the existence of the eastern source. Through the comprehensive analysis of laboratory tests, drilling and outcrop data, a water system from the direction of the elm was found in the southeast uplift belt and named as the elm water system. The study shows that the elm water source rocks originated from Indosinian and Caledonian granites in Zhangguacailing. The water system developed uniformly from Quantou Formation to Nenjiang Formation, and mainly consisted of rivers and deltas. The discovery of the elm water system completely changed the predecessors’ understanding of the non-matter source and water system in the east of Songliao Basin. Therefore, this discovery has opened up new fields for the search for oil and gas reservoirs in the east of Songliao Basin, and has extremely important petroleum geological significance.