【摘要】 根据岩心、测井和地震资料,对准噶尔盆地西北缘中拐地区三叠系进行了层序地层划分,划分为4个三级层序和7个体系域,同时建立了以四级层序为地层单元的高精度层序地层格架。分析了层序格架内沉积体系的时空配置关系,揭示了探区主要油气藏分布规律。研究认为,三级层序边界和四级层序的水进界面是控制该区岩性圈闭形成的重要因素,岩性圈闭主要分布在四级层序上倾尖灭线附近以及中拐凸起斜坡区297井—克021井一带。更多还原

【Abstract】 Based on drill cores,well logs and seismic data,the Triassic in Zhongguai area in northwestern margin of Junggar basin was classified in sequence stratigraphy as four Class-3 sequences and seven system tracts,and high-resolution sequence stratigraphic framework was-established by-Class-4-sequence-as basic stratigraphic unit.This framework includes the analysis of the space-time configuration of the depositional system and the revealing of the-distribution rules of hydrocarbon reservoirs in exploratory areas.The study shows that the boundaries of the Class-3 sequence and Class-4-sequence are significant factors for controlling formations of lithologic traps in this area.The lithologic traps-are mainly distributed near-the-Class-4-sequence pinch out-and the surroundings of Well 297-Well Ke-021 in the slope of Zhongguai swell.更多还原