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通过岩心观察、薄片分析、测井和录井资料分析,对准噶尔盆地西北缘W16井区三叠系沉积相进行了精细的研究。结果表明:W16井区克拉玛依组主要为扇三角洲前缘亚相沉积,发育的微相主要为水下分流河道、分流河道间微相,且湖进—湖退变化迅速。水下分流河道砂体为骨架储集砂体。同时,对克拉玛依组各个小层沉积微相的时空展布特点进行了分析,认为沉积微相对油气聚集具有明显的控制作用,水下分流河道微相砂体是克拉玛依组主要的油气聚集层,该项研究成果不仅为该区油藏储量计算提供了依据,而且为该油田的开发提供了储集砂体骨架分布的基础图件。
The sedimentary facies of Triassic in Well W16 in the northwestern margin of Junggar Basin has been studied carefully by core observation, thin slice analysis, well logging and logging data analysis. The results show that the Kelamayi Formation in W16 is mainly fan delta front subfacies, and the developed microfacies are mainly subaqueous distributary channels, distributary fluvial microfacies, and rapid change of lake-lake descent. Underwater distributary channel sand bodies are skeleton reservoir sand bodies. At the same time, the characteristics of spatiotemporal distribution of sedimentary microfacies in the Karamay Formation are analyzed. It is concluded that the sedimentary microfacies have significant control over the accumulation of oil and gas. The underwater distributary channel microfacies is the main hydrocarbon accumulation layer in the Karamay Formation The results not only provide the basis for the calculation of reservoir reserves in this area, but also provide the basic map of the skeleton distribution of reservoir sand for the development of this oilfield.