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从单井相分析入手,结合地震、测井、古生物、分析化验资料和岩相古地理的研究成果,分析了准噶尔盆地车排子地区古近系沉积相类型及特征,阐明了沉积相带的平面展布特征及沉积演化的控制因素,并进行了有利区带的预测。结果表明,白垩纪后受构造运动的影响,车排子地区发生沉降,在西北高东南低的古地形背景下,差异沉积明显。受湖平面变化、古地貌、物源供给和古气候的控制,古近纪紫泥泉子组沉积时期发育冲积扇、扇三角洲和湖泊沉积,物源来自西北方向;安集海河组沉积时期湖盆范围增大,物源主要来自北方,冲积扇和扇三角洲沉积向北缩进,研究区南部广泛发育滨浅湖沉积。地层发育受沉积特征的控制,有利储集砂体主要为扇三角洲分流河道及水下分流河道砂体,构造-岩性圈闭是研究区下步的勘探重点。
Beginning with single-well facies analysis, the types and features of Paleogene sedimentary facies in Chepaizi area of Junggar Basin are analyzed according to the research results of seismic, well logging, paleontology, laboratory analysis and lithofacies palaeogeography. The sedimentary facies Plane distribution characteristics and controlling factors of sedimentary evolution, and carried out the prediction of favorable zones. The results show that after the Cretaceous, due to the tectonic movement, the subsidence occurred in Chepaizi area, and the difference sedimentation was obvious under the low southeastern high paleogeomorphology in Northwest China. Influenced by the changes of lake level, paleogeomorphology, provenance and paleoclimate, alluvial fans, fan delta and lacustrine sediments were developed during the sedimentary period of the Paleogene Zijinquanzi Formation, and the provenance came from the northwest. During the deposition of the Anjihaihe Formation, The range of the source rocks increased mainly from the north, alluvial fans and fan delta sediments were indented northward. The shallow and shallow lake sediments were widely developed in the southern part of the study area. The stratigraphic development is controlled by the sedimentary characteristics. The favorable reservoir sand bodies are mainly fan delta distributary channel and underwater distributary channel sand body. The tectono-lithologic trap is the next exploration focus of the study area.