Abstract: There are favorable hydrocarbon elements in the eastern segment of southern margin of Junngar Basin. However,complex tectonic deformation and poor seismic imaging quality make the identification of underground structures difficult. From the typical tectonic integrated analysis based on outcrops,geological-hat,rock physics modeling,artificial electric field sounding of depth-resistivity inversion section and seismic data interpretation,together with drilling result,the skeleton structure-strata and a multi-level detachment thrust nappe model is built for deforming complex zone in the eastern segment of southern margin of Junngar Basin,the method of model-building is discussed to guide the seismic interpretation of strongly-deformed and low image quality structures. The footwall buried structures become favorable target for future exploration. Reference information of the model of structure and characteristic of fault is available for the interpretation of complex deformed area,which providing basis for further oil-gas exploration and well-drilling plan in east part of southern margin. The means of model-building has achieved good results in the evaluation of the target oil-gas exploration in the western segment of southern margin,Junggar Basin.

Key words: Junggar Basin, thrust belts in eastern segment of southern margin, outcrops, geological-hat, rock physics modeling, model of structure interpretation

摘要： 准噶尔盆地南缘山前带油气地质条件良好,但构造变形强烈、地震资料品质差且构造解释多解性强。通过南缘东段野外露头典型构造解析、“地质戴帽”、室内构造物理模拟实验、电法勘探中建场测深线的深度—电阻率反演剖面和地震资料解释,结合钻探结果,构建了南缘东段山前复杂带的构造—地层格架和叠瓦状冲断、多层次逆冲推覆的构造模型,探讨了山前复杂构造区低成像品质地震资料的构造解释模型建立的方法;明确逆冲断裂下盘的掩伏构造是下步勘探首选的目标类型。为南缘山前复杂构造带构造解释提供构造样式和断裂类型的参考,进一步为盆地南缘山前带的油气勘探和井位部署提供依据。该构造模型建立的方法在南缘西段山前复杂构造区的勘探目标评价中取得了良好的应用效果。

关键词: 准噶尔盆地, 南缘东段冲断带, 地面露头, 地质戴帽, 物理模拟实验, 构造解释模型

CLC Number: 

• P54