Fault characteristics and evolution of Diaobei sag in the East China Sea shelf basin
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摘要:
东海陆架盆地钓北凹陷断裂系统复杂，断裂组合样式多样，但针对整个凹陷断裂系统及其演化方面的研究较少。基于二维地震资料解释成果，系统研究该区域断裂的展布和演化特征，探讨钓北凹陷的断裂演化模式。研究结果表明: 以渐新统花港组底界和上新统三潭组底界为界，可以在垂向上将断裂系统分为下部张性、中部压性和上部张剪性3套断裂系统; 下部张性断裂主要有单断式、同向断阶、垒状复合断阶等断裂组合样式，主要形成于钓北凹陷的断陷期和断拗期，断裂控制了沉积地层的发育; 中部压性断裂主要有正“Y”形、反“Y”形、负花状等断裂组合样式，主要形成于凹陷的断拗期和拗陷反转期，地层具有明显的上拱形态特征; 上部张剪性断裂主要为层间断裂，平面上呈带状或雁列状展布，形成于区域沉降期，对地层的控制作用较微弱。依据钓北凹陷断裂样式和特征，将钓北凹陷分为西部斜坡带、中央深凹带和东部断阶带。从断裂演化期次来看，断裂系统可划分为断陷-断拗期断裂系统、断拗-拗陷反转期断裂系统和区域沉降期断裂系统。研究对钓北凹陷的石油勘探开发及地质研究具有一定的指导意义。
Abstract:Diaobei sag in the East China Sea shelf basin is characterized by a complex fault systems and multiple fault configurations, and there is little research on the whole fault system and its evolution. The distribution and evolution characteristics of faults in this area were systematically studied based on 2D seismic data, and the fault evolution model in Diaobei sag was discussed in this paper. The results show that the fault system can be grouped vertically into three fault systems, that is the lower(extensional), the middle(compressional), and the upper(extensional shear)fault systems, with the bottom of Oligocene Huagang Formation and the bottom of Upper Miocene Santana Formation as the boundaries. The fault configuration of the lower extensional fault system mainly include single fault type, same-directim stepover, composite horst stepover and other fault combination, which mainly formed in the rifting and say stage of the depression, and the faults controlled the development of sedimentary strata. The fault configurations of the middle compressional fault system are mainly Y-shaped, anti-Y-shaped and negative flower-shaped, and they mainly formed in the say and subsidence inversion stage of the sag. The strata have obvious characteristics of upper arch. The fault configurations of upper extensional fault system are mainly interlayer faults, with the banded and echelon distribution on plane. The fault formed in the subsidence stage of the sag, and its control of the formation is weak. Diaobei sag can be divided into western slope zone, central deep depression zone and eastern fault terrace zone according to fault styles and characteristics. From the perspective of fault evolution stages, the fault systems of Diaobei sag can be diveded into fault depression-say system, fault say-subsidence inversion system, and the regional subsidence system. This research could provide references for the petroleum exploration, exploitation and geology research.
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Key words:
- Diaobei sag /
- fault system /
- fault evolution model /
- formation mechanism
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表 2 钓北凹陷各级次断裂要素
Table 2. Fault elements of each level in Diaobei sag
断裂级别 断开层位 延伸长度/km 垂直断距/m 一级控凹 T16~Tg 10~100 10~400 二级控带 T16~T40 10~50 10~200 三级复杂 T10~T20 10~30 10~120 
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