张家口—蓬莱断裂带渤海段断裂特征及其与油气差异成藏的关系
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李新琦(1987—),男,山东东营人,工程师,从事石油地质综合研究。联系电话:18202270546,E-mail:lixq16@cnooc.com.cn。

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国家科技重大专项“渤海海域大中型油气田地质特征”(2011ZX05023-006-002)。


Fault characteristics and its relationship with differential hydrocarbon accumulation of Zhangjiakou-Penglai Fault in Bohai region
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    摘要:

    利用高分辨率三维地震资料解释成果对张家口—蓬莱断裂带渤海段(简称沙北走滑带)的断裂几何学及动力学特征进行了较系统的分析,结合钻井资料,明确了沙北走滑带各区段在构造特征上的差异性,揭示其对油气差异性成藏的控制作用。根据构造特征的不同,沙北走滑带由西至东明显分为3段,西段表现为一条走向由北东向转为北西向并逐渐收敛相交的弧形走滑压扭断裂,呈左旋右阶帚状排列;中段由于受南北两大凸起的限制,发育北西向左旋、北东向右旋共轭走滑断裂体系;东段在开阔的变形空间下受郯庐断裂的影响,以北东向右旋张扭断裂为主。沙北走滑带整体表现为负花状或“Y”字型构造,表现出古近纪拉张和新近纪走滑的2期演化特征。沙北走滑带经历印支期、燕山期和喜马拉雅期3期构造运动改造后基本定型,受变形空间和区域大型走滑断裂带的控制,由西向东逐渐由相对挤压应力背景过渡为相对拉张背景。沙北走滑带走滑断裂的各段差异性特征不仅控制了断裂带不同部位圈闭发育状况和古近纪各时期沉积相的展布,还控制着各段油气运移和输导的效率,进而控制了油气的差异成藏。沙北走滑带石油地质条件呈现出由西向东逐渐变好的特征,东段和中段的油气富集程度明显高于西段。

    Abstract:

    Based on detailed interpretations of 3D high-resolution seismic data,the geometry and dynamics characteristics of the Zhangjiakou-Penglai Fault(Shabei strike-slip belt for short)was analyzed systematically. The differences of structural characteristics in different zones of the Shabei strike-slip belt were pointed out and their control on hydrocarbon accumulation was revealed combined with drilling data. According to the differences in structural characteristics,this strike-slip fault zone can be divided into three sections from west to east. The western section of the fault is an arc-shaped compressive-shear sinistral strike slip fault which distributes from NE-wards to NW-wards and gradually converges at an arc in right-handed stepped form shaped like a“broom”. The middle section is a conjugate strike-slip system trending left-handed NW and right-handed NE because of the limit of two uplifts in the south and the north. The main faults in the eastern section are NE-trending right-handed tenso-shear faults which are influenced by the Tanlu fault in an open distortional space.The strike slip faults in this area are characterized by negative flower structure or“Y”shape structure,showing that there were two phases of tectonic evolution in this region-extension in Eogene and strike-slip in Neocene. Shabei strike-slip zone is basically fixed after three phases of tectonic movements including Indo-Chinese,Yanshanian and Himalayan. Being controlled by distortion space and regional large-scale strike-slip faults,the general setting of Shabei strike-slip zone is shown in compression and gradually converting to extension from west to east. The different properties of each segment of Shabei strike-slip fault not only control fault traps development at different positions of the fault zone and sedimentary facies distribution in Paleogene,but also oil and gas migration efficiency,thus controlling differences in oil and gas accumulation. On the whole,petroleum geological conditions get better gradually from west to east,and the hydrocarbon enrichment in the eastern and the middle section is significantly higher than that in the western section of the Zhangjiakou-Penglai Fault.

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李新琦,李慧勇,于海波,江涛,许鹏.张家口—蓬莱断裂带渤海段断裂特征及其与油气差异成藏的关系[J].油气地质与采收率,2016,23(5):16~22

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  • 在线发布日期: 2016-10-11
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