石油实验地质2018，Vol.40Issue(3)：439-447,9.DOI:10.11781/sysydz201803439
潜山复杂断裂描述技术——以渤海湾盆地济阳坳陷桩海地区为例
Complex fault interpretation of buried hills:A case study of Zhuanghai region in Jiyang Depression,Bohai Bay Basin
摘要
Abstract
The Zhuanghai oil field is located in the north of the Jiyang Depression,Bohai Bay Basin. Drilling data illustrated that the pre-Tertiary formations of the Zhuanghai area are rich in oil. However, complicated structures developed in the pre-Tertiary formations with unclear fault directions and distributions,which made the exploration of the pre-Tertiary structures very difficult. The nature of faults was determined by considering the mechanism of fault evolution.The key techniques for the interpretation of faults of different natures were studied to accurately describe the fault system and deduce fault development patterns to define the structural features. The Zhuanghai area has experi-enced several stages of deformation,including regional uplift,stable structure,extrusion,stable structure,tension, tense-shearing and compresso-shearing. The tectonic compressions during the Indosinian and the late Yanshanian periods formed thrust tectonics, which laid the foundation for buried hills. The extensional strike-slips in the Himalayan period made the buried hills more complicated. A fault interpretation was made, mainly focusing on reversed faults.The derivative of stratigraphic thickness change rate and dip can be calculated to interpret reversed faults.Time slices and fault planes were combined to interpret strike-slip faults. Coherent cube, ant-colony and 3D visualization were combined to interpret normal faults. The Paleozoic in the Zhuanghai area developed NNE-trending reverse faults and EW-trending extensional faults,with thrust,negative reversal and strike-slip fault types,showing a complex pattern of"barriers and depressions".关键词
逆断层/断层样式/断裂演化/桩海潜山/济阳坳陷/渤海湾盆地Key words
reverse fault/fault style/structural evolution/buried hills of Zhuanghai area/Jiyang Depression/Bohai Bay Basin分类
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吴笑荷..潜山复杂断裂描述技术——以渤海湾盆地济阳坳陷桩海地区为例[J].石油实验地质,2018,40(3):439-447,9.基金项目
国家科技重大专项"渤海湾盆地精细勘探关键技术(三期)"(2016ZX05006)资助. （三期）
