CAJ | 학술논문

为建立准噶尔盆地西北缘克百断裂下盘二叠系砂砾岩的沉积模式,以为优质储层的预测提供借鉴,通过岩心观察、薄片分析及扫描电镜分析,结合录井资料和测井资料,在宏观构造背景和沉积环境下,对研究区砂砾岩的沉积特征进行了研究.结果显示,研究区砂砾岩沉积环境分为水上和水下两种,总体上补给水体主河道的水量较大,水流稳定、不间断;砂砾岩储层的物性随着沉积环境的不同表现出较大的差异,且以扇三角洲前缘亚相水下分流河道微相最好.强调了湖岸线对储层物性的控制作用,模糊了冲积扇扇缘与扇三角洲平原之间的界线,将冲积扇与扇三角洲有机结合,提出了研究区冲积扇 -扇三角洲-湖泊相相结合的沉积模式,把研究区划分为3个沉积相、8个沉积亚相.
위건립준갈이분지서북연극백단렬하반이첩계사력암적침적모식,이위우질저층적예측제공차감,통과암심관찰、박편분석급소묘전경분석,결합록정자료화측정자료,재굉관구조배경화침적배경하,대연구구사력암적침적특정진행료연구.결과현시,연구구사력암침적배경분위수상화수하량충,총체상보급수체주하도적수량교대,수류은정、불간단;사력암저층적물성수착침적배경적불동표현출교대적차이,차이선삼각주전연아상수하분류하도미상최호.강조료호안선대저층물성적공제작용,모호료충적선선연여선삼각주평원지간적계선,장충적선여선삼각주유궤결합,제출료연구구충적선 -선삼각주-호박상상결합적침적모식,파연구구화분위3개침적상、8개침적아상.
This paper aims at developing a sedimentary model of the Permian sandy conglomerate in the footwall of the Kebai Fault in the Junggar Basin,which can provide a reference for predicting good reservoirs.Sedimentary features of the sandy conglomerate in the study area are examined through core observation, thin section analysis and scanning electron microscope analysis.Tectonic settings and depositional conditions are taken into consideration and logging data are also consulted.The depositional environments of the sandy conglomerate in the study area can be divided into two types,namely above-water and underwater environments.Overall,the main feeder channels are large in water volume,and stable and continuous in water flow.Physical properties of the sandy conglomerate reservoirs differ greatly in different depositional environments,and the best occurs in underwater distributary channel on fan delta front.The control of shoreline on reservoir physical property is highlighted,while the distinction between alluvial fan margin and fan delta plain is obscured.A sedimentary model with alluvial fan-fan delta-lacustrine facies integrated is proposed and 3 sedimentary facies and 8 sedimentary subfacies are identified in the study area.