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摘要:
冷泉亭地区是西湖凹陷重要的油气勘探区域，由于经历了多期构造运动，该地区断裂构造十分发育，并且对盆地的沉积构造演化及油气成藏具有重要控制作用。为揭示对冷泉亭地区新生界油气成藏具有关键控制因素的断裂构造特征及其发育机制，通过对西湖凹陷平北冷泉亭地区最新三维地震资料的精细构造解释，系统研究了该地区的断裂构造类型、几何学特征及成因演化。结果表明：冷泉亭地区断裂以正断层和走滑断层为主，该区断裂发育数量众多且空间上具有明显的分区分层差异活动特征。受区域应力场影响，西湖凹陷冷泉亭地区断裂构造主要经历了5大阶段：①断陷期（古新统—平湖组下段沉积期），共出现3幕断层强扭张活动；②断拗转换期（平湖组中段—上段沉积期）大中型断层的继承性张扭活动；③初始拗陷期（花港组沉积期）主干断层的继承性弱扭张活动；④稳定拗陷期（玉泉组—柳浪组沉积期）西缘坡折带主干断层及冷泉亭主干断层继承性弱伸展活动；⑤区域沉降期（三潭组沉积期至今）剪切应力作用导致的西缘坡折带主干断层的微弱伸展活动。
Abstract:The Lengquanting area is a major hydrocarbon exploration area of the Xihu Sag, and the fault structures in this area are highly developed due to multi-stage tectonic movements, and plays a very important role in controlling the sedimentary tectonic evolution and hydrocarbon accumulation in the basin. Based on the detailed structural interpretation of the latest 3D seismic data in the Lengquanting area of the Xihu Sag, we analyzed systematically the fault structure types, geometric characteristics, and genetic evolution of the area to understand the development mechanisms of faults, and the key con-trolling factors of hydrocarbon accumulation. Results show that the faults in the area are mainly normal faults and strike-slip faults. There are a large number of faults and their activities are characteristic of zoning and stratification in space. Affected by the regional stress field, the fault structure of the study area has experienced five major stages: ① Fault depression period (Paleocene-lower Pinghu Formation deposition period), with three episodes of strong torsional-tensile activities; ② Fault-depression transition period (middle-upper Pinghu Formation deposition period), with inherited tensional-torsional activities of large and medium-sized faults; ③ Initial depression period (Huagang Formation deposition period), with inherited weak torsional-tensile activities of the main faults; ④ Stable depression period (Yuquan Formation-Liulang Formation deposition period), with inherited weak extensional activities of the main faults in the western slope break zone and the main fault in the area; ⑤ Regional subsidence period (from Santan Formation deposition period to the present), with weak extensional activities of the main faults in the western slope break zone caused by shear stress.
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Key words:
- fault structure /
- structure features /
- genetic evolution /
- Lengquanting area /
- Xihu Sag
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