摘要:银根—额济纳旗盆地是在前寒武纪结晶地块和古生代褶皱基底基础上发育起来的中新生代断陷型沉积盆地，断陷分割严重，具有小湖盆多物源、相带窄、相变快、冲积体系沉积特点；每个凹陷为一个独立的断陷湖盆，自成一个独立的沉积单元，构成相对独立的含油气系统或勘探单元。侏罗系煤系与白垩系湖相泥质烃源岩发育，有机碳丰度中等，处于成熟与高成熟演化阶段；储集层以侏罗系致密砂岩与白垩系砂砾岩为主，受成份成熟度与结构成熟度所限，储层物性较差，多为低孔低渗储集层类型；由于后期构造改造强烈，成藏保存至关重要。在相对继承性较好的坳陷内主力沉积凹陷有利于油气生成、运聚成藏和后期保存。本文主要采用成因法（盆地模拟），结合地质条件类比法计算盆地石油资源量为6.5×108 t （含非常规致密油），非常规致密砂岩气为1 500×108 m3，具有良好勘探潜力；勘探方向上应立足居延海、查干、苏红图和达古4个主要沉积坳陷中的主力断陷，在加大针对断背斜、断块、断层遮挡的构造油气藏勘探的同时，注重斜坡区与凹陷区非常规致密油、致密砂岩气藏勘探。
关键词: 烃源岩/
成藏条件/
油气资源/
勘探方向/
银根—额济纳旗盆地
Abstract:The Yingen-Ejin Banner Basin is a Mesozoic-Cenozoic fault-subsided sedimentary basin that developed on the basis of the Precambrian crystalline block and the Paleozoic fold basement with serious depression segmentation. It has the characteristics of small lake basin, multi-source, near-source, multiphase belt, narrow phase zone, rapid phase change, and development of alluvial fan. Each depression is an independent faulted lake basin, forming an independent sedimentary unit, forming a relatively independent petroleum system or exploration unit. Jurassic coal and Cretaceous lacustrine argillaceous hydrocarbon source rock development, organic carbon abundance medium, in mature and high mature evolution stage. The reservoir layer is dominated by Jurassic tight sandstone and Cretaceous glutenite, which is limited by compositional maturity and structural maturity. The reservoir properties are poor, mostly low-porosity and low-permeability reservoir types, due to the strong post-structural transformation, the preservation of the reservoir is critical. The main depression in the relatively well-inherited depression is favorable to oil and gas generation, migration and accumulation, and subsequent preservation. Combining the geologic conditions of each depression with the latest oil and gas resources evaluation results, the direction of oil and gas exploration in the Yingen-Ejin Banner Basin should be based on four major depressions：Juyanhai, Chagan, Suhongtu, and Dagu, the main fault depression（sag）is the major exploration field. The exploration of unconventional tight oil reservoir and tight sandstone gas reservoir in slope area and sag area is emphasized while basing on the exploration of faulted Anticline, fault block and fault shielding lithological reservoir.
Key words:Hydrocarbon source rock/
Accumulation condition/
Oil and gas resources/
Exploration direction/
Yingen-Ejin Banner Basin
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