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为适应目前准噶尔盆地南缘油气勘探的需要,选取研究区典型剖面——雀儿沟剖面开展白垩系地层特征及沉积环境研究。基于野外露头观察及薄片鉴定资料,结合地层划分对比及相标志,进行地层特征分析,将白垩系划分为下统吐谷鲁群清水河组、呼图壁河组、胜金口组、连木沁组和上统东沟组。根据岩性、粒度、颜色及原生沉积构造等对沉积环境进行系统分析,划分出辫状河、冲积扇、扇三角洲和湖泊4种沉积环境。研究区下白垩统发育2套沉积旋回,其中清水河组为一个完整的湖进、湖退旋回,发育辫状河、扇三角洲和湖相沉积;呼图壁河组、胜金口组和连木沁组表现为一个完整的湖进、湖退旋回,发育扇三角洲和湖相沉积。上白垩统东沟组表现为湖进旋回,发育辫状河和冲积扇沉积。研究结果表明,准噶尔盆地南缘白垩系具有良好的石油地质条件。
In order to meet the need of oil and gas exploration in the southern margin of Junggar Basin, the Cretaceous stratigraphy and sedimentary environment of the typical profile-Queerigou section of the study area are selected. Based on the field outcrop observation and sheet identification data, stratigraphic division and phase identification were combined to analyze the stratigraphic characteristics. The Cretaceous was divided into the Lower Tonggulu Qunshuihe Formation, the Hutubihe Formation, the Shengjinkou Formation and the Lianmuqin Formation And the East Donggou group. The sedimentary environment was systematically analyzed according to lithology, grain size, color and primary sedimentary structure, and four sedimentary environments of braided river, alluvial fan, fan delta and lake were divided. Two sets of sedimentary cycles developed in the Lower Cretaceous of the study area, of which Qingshuihe Formation is a complete lake and regurgitating, developing braided river, fan delta and lacustrine deposits. Hutubihe Formation, Shengjinkou Formation and even The Qinshu Formation is characterized by a complete lake intrusion and a retreat in the lake, with the development of fan delta and lacustrine sediments. The Upper Cretaceous Donggou Formation is characterized by a lake-like cycle and the development of braided river and alluvial fan. The results show that the Cretaceous in the southern margin of Junggar Basin has good petroleum geological conditions.