琥珀营北背斜形成机理及精细构造解释
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摘要
琥珀营北地区位于廊固凹陷大柳泉构造带东北翼,处于两组走向相同倾向相反正断层系的结合部。由于该区断层发育,地层非常破碎,构造、层位多解性强,多年来,勘探陷于停滞。近年来,进行立足高品质的三维地震资料,针对制约该区勘探的关键地质问题—构造,进行精细分析与解释,建立构造应力作用模式,深入分析该区构造成因机制,认为该区受北北东走向的旧州断层与琥珀营断层所控制,在两种构造应力作用下形成,构造形态为近于东西走向的挤压背斜,被旧州以及琥珀营断层的多条分支断层切割的非常破碎。分析认为该区属于"反向应力传递带",背斜核部处于两组走向相同倾向相反应力结合部。在此认识基础上精细构造解释,合理组合断裂系统,落实圈闭形态,为勘探井位上钻提供依据。
Hupoying North anticline is located in the northeastern wing of Daliuquan Structure of Langgu Depression. It is at the junction of two formations with positive faults, which have the same direction but opposite dips. With faults developing in this region, the formation is extremely broken with interpretation of structure and level diversified. Exploration of this area has come to a standstill for many years. High-quality 3D seismic data has been acquired in recent years. Detailed analysis and interpretation have been made on the structure a key geological problem in exploration of this area, with the structural stress effect model established. Based on in-depth analysis of structural origin mechanism, it is held that this area is controlled by the near east-west directional Jiuzhou fault and Hupoying fault and developed under the effect of stress from these two structures. The structural shape is a squeezed anticline, which is cut into pieces by a number of branch faults of Jiuzhou fault and Hupoying fault. Based on the analysis, this area belongs to òreverse stress transfer beltówith the core of the anticline at the junction of two formations that have the same direction but opposite dips. Based on such knowledge, the structure is interpreted in details and the fault systems are assembled reasonably to locate the shape of trap and provide the basis for drilling of exploration wells.
Hupoying North anticline is located in the northeastern wing of Daliuquan Structure of Langgu Depression. It is at the junction of two formations with positive faults, which have the same direction but opposite dips. With faults developing in this region, the formation is extremely broken with interpretation of structure and level diversified. Exploration of this area has come to a standstill for many years. High-quality 3D seismic data has been acquired in recent years. Detailed analysis and interpretation have been made on the structure a key geological problem in exploration of this area, with the structural stress effect model established. Based on in-depth analysis of structural origin mechanism, it is held that this area is controlled by the near east-west directional Jiuzhou fault and Hupoying fault and developed under the effect of stress from these two structures. The structural shape is a squeezed anticline, which is cut into pieces by a number of branch faults of Jiuzhou fault and Hupoying fault. Based on the analysis, this area belongs to òreverse stress transfer beltówith the core of the anticline at the junction of two formations that have the same direction but opposite dips. Based on such knowledge, the structure is interpreted in details and the fault systems are assembled reasonably to locate the shape of trap and provide the basis for drilling of exploration wells.
引文
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