论文部分内容阅读
莺歌海—宋红盆地位于越南东海岸和海南岛之间,由红河断裂带控制,形成了具有独特的走滑拉张构造特征的新生代盆地,使断裂东西两侧具有不同的构造特征.以往我国对盆地的研究主要集中在盆地东部,而盆地周边国家的研究主要集中在盆地的西部,缺乏横跨整个莺歌海—宋红盆地的地震剖面和遍布全盆地的测井资料,因此对整个盆地的构造特征和深部地壳结构研究相对较为薄弱.本文利用CCOP-ICB中越跨国合作项目提供的横跨整个盆地的地震剖面,并结合1′×1′卫星测高重力异常研究了莺歌海—宋红盆地的整体构造特征,根据断裂运动特征,结合由卫星测高重力异常计算出的布格重力异常,识别了盆地内部11个构造单元.并以地震剖面解释和盆地内丰富的测井资料作为约束,利用基于频率域Parker算法的密度界面反演算法,获得了盆地基底和莫霍面埋深,并以此为基础,以一条横跨盆地主体的中越联合地震剖面的地震解释为初始模型,利用综合地球物理反演技术,探讨了其深部地壳结构.
Yinggehai-Songhong Basin, located between the east coast of Vietnam and Hainan Island, is controlled by the Honghe fault zone and formed a Cenozoic basin with unique characteristics of strike-slip extension and structural features on both east and west sides of the fault. In the past, the study on basins in our country mainly concentrated in the eastern part of the basin, while the research on the surrounding countries mainly concentrated in the western part of the basin, lacking the seismic profiles across the Yinggehai-Songhong basin and the logging data throughout the basin. The tectonic features of the whole basin and the deep crustal structure are relatively weak.In this paper, the seismic profiles across the basin provided by the CCOP-ICB Sino-Vietnamese cross-border cooperation project are used in this paper. Based on the gravity anomaly of the 1 ’× 1’ satellite, Based on the characteristics of fault movement and the Bouguer gravity anomaly calculated by satellite altimetry gravity anomalies, 11 structural units within the basin were identified. Based on the seismic profile interpretation and abundant logging in the basin Data as a constraint, using the density interface inversion algorithm based on the Parker algorithm in frequency domain, the depth of basal and Moho surfaces in the basin is obtained. Based on this, Taking a seismic interpretation of the Sino-Vietnam joint seismic profile across the basin as the initial model, the deep crustal structure was discussed using integrated geophysical inversion technique.