JapaneseRenewable energy field20230403
Offshore wind power generation support services
Field:
Natural resources and energy business ＞ Renewable energy field
Keyword:
Overview
Japan has declared its aim to become carbon neutral by 2050 by reducing overall greenhouse gas emissions to zero. As part of the action plan to achieve this goal, Japan will
introduce renewable energy as much as possible. Offshore wind power generation is positioned as the key to these initiatives.
For offshore wind power generation, it is necessary to survey the seafloor ground of the construction sea area. This survey makes it possible to examine the basic design of the
wind turbine to be installed on the seafloor and the layout of the power plant. OYO Corporation is actively engaged in activities such as developing unique technologies for
efficient seafloor ground surveys and forming alliances to meet market needs for the offshore wind power generation market, which is expected to expand rapidly in the future.
Image of the foundation structure of an offshore wind power generation facility.
Suitable foundation structures must be designed according to the depth of water and geological conditions of the seafloor.
Features
Development of technology for efficient seafloor geological surveys
In order to meet the needs of the rapidly expanding market, OYO Corporation is utilizing our strengths in geophysical exploration technology and equipment development capabilities to develop a variety of new technologies for enabling efficient and safe surveying of wide-area seafloor ground.
Offshore reverse P-S logging (drilling vibration responsive P-S logging)
Ocean bottom seismograph
Survey schematic diagram
Using the vibrations generated by CPT, boring excavation, standard penetration tests, etc., we use seismographs installed on the seafloor to record and analyze the S-wave velocity
structure of the ground.
This is a cost-effective survey method optimized for offshore geological surveys in harsh weather conditions.
Offshore microtremor array exploration method
Offshore microtremor meter
Survey schematic diagram
This meter uses natural oscillation such as waves to analyze and obtain ground S-wave velocity structure from the seismic bedrock. This survey method does not require large fixed facilities such as SEPs and steel oar (marine scaffolding), and is optimal for geological surveys even on the sea in harsh weather conditions.
Percussion mounted CPT system: OGS-CPT
Example of installing large scaffolding
Survey being conducted
- Also applicable to hard ground that cannot be surveyed using a normal CPT (Cone Penetration Tester)
- Compared to a borehole survey, the cost is lower, and sampling of non-penetrated parts is possible.
Possessing the largest number of scaffoldings (steel oars) for seafloor geological surveys in the industry
In conjunction with the revitalization of the offshore wind power generation market, there is now a large shortage of dedicated scaffolding equipment for offshore geological surveys in the market. This has created issues such as delays in the progress of projects. Since 2018, OYO Corporation has built 10 new steel oars to meet these growing market needs.
Provision of 3D seafloor geotechnical model
We create a highly accurate 3D geotechnical model of the project sea area based on existing materials, seafloor topography, and geological surveys. This technology has been well received by many clients because it contributes to the economic efficiency of design and consideration of ground risk.
Bird's-eye view
3D geotechnical model
