CHARACTERISTICS OF GRAVITY FIELD AND FAULT STRUCTURES IN JINYANG BASIN, WESTERN LIAONING
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摘要:
在金羊盆地物性特征研究的基础上, 通过对重震等资料的综合处理, 完成了研究区重力场特征及成因分析和断裂构造体系的划分.研究区重力场的特征是区内西部凹陷、中东部凸起和中南部凹陷共同作用.重力区域场主要是前中生界底面(基底)起伏变化引起.重力剩余场高、低相间排列的特征反映了区内凹隆格局及凹隆间发育的断裂.研究区断裂体系主要由北东向和北西向2组断裂构成, 前者形成时期早于后者, 都对金羊盆地的次级构造形态进行后期的多次改造, 形成本区凹、凸相间的构造格局.
Abstract:Based on the study of physical characteristics of Jinyang Basin, through comprehensive processing of gravity and seismic data, the paper analyzes the characteristics and causes of gravity field and classifies the fault system. The gravity field represents the joint action of western sag, mid-eastern uplift and mid-southern sag in the area. The regional gravity field is mainly caused by the undulation of pre-Mesozoic bottom (basement), while the high-low alternating distribution of residual gravity field reflects the concave-uplift pattern and developed faults inside. The structural system is mainly composed of NE- and NW-trending faults, with the former formed earlier than the latter, both multiply reforming the secondary structures of Jinyang Basin in later stages, and forming the concave-convex alternating structural pattern.
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Key words:
- Jinyang Basin /
- gravity field /
- gravity and seismic joint inversion /
- fault structure /
- western Liaoning
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