Multiple provenance analysis of the Chao 84-6 well area during the deposition of the 4th member of the Quantou Formation in the Central depression, Songliao Basin
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摘要: 松辽盆地朝84-6井区在白垩系泉头组四段沉积时期位于盆地西南通榆-保康水系和南部长春-怀德水系的交汇处,交汇水系内沉积物来源、古水流走向等仍属未知。通过对岩心、分析化验资料和区域砂体厚度预测结果的综合研究,根据重矿物组合特征、ZTR指数变化特征和地层砂体展布规律,发现研究区的沉积特征具明显物源分带性,将其划分为保康物源体系主控I区、怀德物源体系主控Ⅲ区和双物源体系混合控制Ⅱ区。结合研究区沉积相模式研究成果,对比分析各分区的碎屑岩组分、砂岩厚度、岩石粒度和泥岩颜色等沉积特征的相似性和差异性,验证了物源体系主控区域划分的合理性。Abstract: The Chao 84-6 well area was located in the intersection of the Tongyu-Baokang drainage system in the southwest and Changchun-Huaide drainage system in the south of the Songliao Basin during the deposition of the 4th member of the Cretaceous Quantou Formation in the Central depression, Songliao Basin. Due to complex convergence of multiple sources of the drainage systems, the sediment sources and palaeocurrent directions remain uncertain up to now. In the light of heavy mineral assemblages, ZTR indices and sandstone distribution, the authors in this paper contend that the sediment sources may be composed of the provenance I controlled by the Baokang drainage system in the southwest, provenance Ⅲ controlled by the Huaide drainage system in the south, and provenance Ⅱ controlled by the double drainage systems.
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