针对研究区克下组沉积相特征, 运用岩芯、测井、录井和地震等资料, 对研究区克下组单井相、剖面相、平面相和沉积相模式进行研究.研究区三叠系克下组在西北部物源的控制下, 主要发育由西北向-东南方向展布的扇三角洲前缘亚相, 发育的微相主要有水下分流河道、水下分流河道间、河口坝和席状砂.研究区克下组S6砂层组和S7砂层组沉积旋回的识别和划分显示, 克下组沉积早期到晚期水体呈水进模式, 向上单砂体厚度逐渐变薄, 沉积物粒度变细.基于上述研究, 建立了研究区扇三角洲沉积模式.%Aiming at the study on some sedimentary facies characteristics, using the data of core, logging, mud logging and seismic of the lower member of Karamay formation in the study area, the single well phase, profile facies, plane facies and sedimentary facies pattern are studied.The lower member of Karamay formation (Triassic) in the study area is controlled by the provenance from northwest margin of basin, and the fan delta front subfacies is growing from northwest to southeast.Moreover, the microfacies mainly include underwater distributary channel, underwater interdistributary, mouth bar and mat sand.According to the identification and division of sedimentary cycles of the S6 and S7 sand group of the lower member of Karamay formation in the study area, the early and late sedimentary stage of the lower member of the Karamay formation shows a water entry pattern, the thickness of upward single sandbody gradually becomes thin and the grain of sediment becomes fine.Based on the above research, the sedimentary pattern of fan delta in the study area is established.
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