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本文从一定地质时期内不同地块的活动和不同断裂的发育应在一个统一的应力系统下形成有序、配套的组合关系,它们的形成演化控制了该地区构造格局的观点出发,在南海西南部发现存在一个大型人字形走滑断裂系,由于曾母地块和南沙地块先后南移与西婆罗洲地块及其边缘增生带相碰撞,此人字形走滑断裂体系为一右旋体系。在人字形断裂间所挟持的曾母地块在渐新世一中新世时曾发生从向西南俯冲到向东南俯冲的逆时针旋转,从而在其西侧产生一系列由张扭断层组成的帚状构造。上述构造格局对解释曾母盆地的形成机制,解释盆地内出现的高热流值,沿断裂带产出的天然气中含大量CO_2的现象和分析盆地油气分布规律有着重要意义。
This article from a certain geological period of different plots of activity and the development of different faults should be formed under a unified system of stress and orderly, supporting the combination of their formation and evolution control of the tectonic framework of the region from the point of view, in the Southwest Southwest Department found a large herringbone strike-slip faulting system. Due to the collision of the Zengmu block and the Nansha block with the southward movement of the West Borneo block and its marginal accretion zone, the herringbone strike-slip fault system is a dextral system . During the Oligocese-Miocene Xengtu massacre in the herringbone fractures, Zengmu massif occurred a counterclockwise rotation from the southwestward subduction to the southeastward subduction, resulting in a series of zonal faults on the west side Broom-like structure. The above tectonic framework is of great significance for explaining the formation mechanism of the Zengmu Basin, explaining the high heat flow values occurring in the basin, the large amount of CO 2 in the natural gas produced along the fault zone, and the analysis of hydrocarbon distribution in the basin.