Liang Rui-cai

Marine Engineering Geological Exploration Information System (MEGEIS): A GIS-based application to marine resources exploitation

Based on the ArcGIS geographic information system and the ORACLE database management system, this paper reports our studies on the technology of Marine Engineering Geological Exploration Information System (MEGEIS). By analyzing system structure, designing function modules and discussing data management, this paper systematically proposes a framework of technology to integrate, manage, and analyze the seabed information comprehensively. Then, the technology is applied to the design and development of the Bohai Sea Oilfield Paradigm Area Information System. The system can not only meet the practical demands of marine resources exploration and exploitation in the Bohai Sea oilfield, but also serve as a preparatory work in theory and technology for the realization of the ‘Digital Seabed’.

Structural control of the Gagua "Wedge" Zone east of Taiwan Island on the southern Okinawa Trough

Based on compositive analysis and interpretation of the observed and historical data, the geophysical field characters and structural properties of the Gagua “Wedge” Zone of the sea area east of Taiwan Island and the primary tectonic stress direction and its variabilities of backarc spreading in the southern Okinawa Trough are studied. It is concluded from the study results that the Gagua “Wedge” Zone is structurally consistent with the Gagua ridge and two fault basins on both sides of the Gagua ridge, and adjusts the moving direction and distance of the western Philippine Sea plate to make the northwestward motion of the plate on its east side change to the northward subduction of the plate on its west side so that the primary tectonic stress direction of the Okinawa Trough changed from NW-SE to nearly N-S, which provided the stress source for the Okinawa Trough to enter the second spreading stage.