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松辽盆地南部地层单元空间分布特征研究
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Abstract:
松辽盆地是我国东北部中新生代陆相沉积盆地，蕴含丰富的石油、天然气、煤炭和铀资源。前人研究了松辽盆地南部砂岩型铀矿同沉积地层间的关系，但对区域地层空间分布规律的研究则较为薄弱。本研究在系统收集测井、岩心编录、野外露头调查和古生物等资料的基础上，借助多井联合地层剖面编制与分析技术，建立了松辽盆地南部等时地层格架，发现上白垩统泉头组–青山口组–姚家组–嫩江组存在着由东往西的超覆现象，可能代表了不同沉积期沉降中心由东往西迁移的规律。嫩江组区域分布稳定且厚度较大，姚家组分布较稳定且厚度偏薄，青山口组和泉头组区域分布稳定性较差且呈现自东向西超覆的特征。总体而言，上白垩统地层走向以北东向为主，与松辽盆地展布方向相吻合。
Songliao basin that is rich in oil, natural gas, coal and uranium resource is a Meso-Cenozoic continental sedimentary basin in Northeast China. The relationships between sandstone type uranium deposits and sedimentary strata in South Songliao Basin have been reported by many previous literatures, while the regional distribution characteristics of these sedimentary strata have not been well understood. This study established the framework of the isochronous strata for South Songliao Basin based on the core logging data collection and analysis, field outcrop investigation, and paleontology data analysis with the help of multi-well stratigraphic cross section profile establishment and analysis technology. An overlap has been found for Upper Cretaceous strata from Quantou and Qingshankou Formations in the east to Yaojia and Nenjiang Formations in the west, which indicates that the center of deposition once migrated from east to west in sedimentary history. The regional sedimentary strata of Nenjiang Formation are stable and thick, while those of Yaojia formation are stable and thin. Regional sedimentary strata of Qingshankou and Quantou Formation are unstable and overlapped from east to west. The strikes of the Upper Cretaceous strata are in NE direction and consistent with the distribution direction of Songliao Basin.
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