论文部分内容阅读
额南油田是2009年发现的位于二连盆地腾格尔坳陷内的一个含油气区块,主要含油气层系为下白垩统,该区块研究程度较低,亟需对沉积演化及油气储层特征进行深入研究。额南油田下白垩统包括阿尔善组、腾格尔组和塞汉组,但仅在阿尔善组和腾格尔组发现油气显示。通过综合分析岩屑录井资料以及前人研究成果认为,研究区阿尔善组主要发育扇三角洲、滨浅湖相沉积;腾格尔组一段以滨浅湖、半深湖-深湖相为主,周边发育小型扇三角洲扇体;腾格尔组二段以滨浅湖相为主,但初期仍发育了少量小型扇三角洲扇体,后期仅发育泥岩沉积。
The foreshore oilfield is a hydrocarbon-bearing block located in the Tengger Depression in the Erlian Basin, discovered in 2009. The main hydrocarbon-bearing layer is the Lower Cretaceous. This area has a low degree of research and is in urgent need of sedimentary evolution and oil and gas Reservoir characteristics in-depth study. The Lower Cretaceous of Nuonan Oilfield includes the Aershan Formation, the Tengger Formation and the Sethan Formation. However, hydrocarbon discoveries were only found in the Arshan Formation and the Tengger Formation. Through the comprehensive analysis of debris logging data and previous research results, it is considered that the Arxian Formation in the study area mainly includes fan delta and shore-shallow lacustrine facies sedimentation; the first segment of the Tengger Formation is mainly coastal shallow lake and semi-deep lake-deep lake , With fan-shaped delta fans in the surrounding area. The second member of the Tengger Formation is dominated by the shore-shallow lacustrine facies, but a small number of small fan deltaic fans were still developed in the early stage and mudstone was only developed in the later period.