Debris Survey

A Platform Debris Survey is a critical safety operation conducted before a Jack-Up Rig arrives at a location. Its primary purpose is to ensure the seabed is clear of obstructions that could damage the rig’s legs (spudcans) or interfere with its stability during the "jacking up" process.

The survey typically covers a 500m to 1,000m radius around the proposed location.

Other Services

Underwater Positioning Service

An Underwater Positioning Service using USBL (Ultra-Short Baseline) is the industry-standard method for tracking subsea assets in real-time. Unlike GPS, which cannot penetrate water, USBL uses acoustic "pings" to calculate the position of ROVs, divers, or equipment relative to a surface vessel.

Magnetometer Survey

A Magnetometer Survey is a passive geophysical method used to detect and map ferrous (iron or steel) objects on or below the seabed.

4. Equipment

MVM Surveys is committed to utilizing leading-edge technology to deliver highly accurate and efficient marine survey solutions, ensuring client projects meet the most stringent industry standards.

This commitment is reflected in the deployment of state-of-the-art geophysical and hydrographic equipment, including:

Services Overview

Offshore Survey & Positioning Services

M.V.M. Surveys (Thailand) Co., Ltd. provides marine geoscience, hydrographic, and positioning services supporting offshore Oil & Gas operations—covering hazard assessment, rig moves, and high-resolution seabed mapping.

Debris & Hazard SurveysDecommissioning & Pre-Drilling

Rig Move SupportPre-move / Transit / Post-move

Hydrographic MappingBathymetry / SSS / SBP / Mag

Service Categories

Debris Survey Rig Move Survey Hydrographic Survey Geohazard Positioning

Go to Debris Survey Go to Rig Move Go to Underwater Survey

Debris Survey

In the oil and gas industry, a debris survey primarily refers to a marine geophysical and visual survey conducted to identify and map man-made solid materials on and below the seabed, particularly in areas near offshore infrastructure.

Purpose & Methodology

The purpose and methodology of these surveys typically fall into two main categories:

Decommissioning and Clearance Surveys — performed when an oil and gas field reaches the end of its operational life.
Pre-Drilling (Site/Hazard) Surveys — conducted before drilling or construction activities begin to reduce seabed risk.

Typical deliverables: debris/hazard maps, target lists, anomaly interpretation, recommended clearance zones, and verification results after removal (if applicable).

Pictures of Debris Survey

Debris Survey

Field Work

Seabed Check

Decommissioning Clearance Pre-Drilling Hazard / UXO

Next: Rig Move Survey →

Marine Survey for Rig Move

Marine surveys are an essential, mandatory, and safety-critical component of any offshore rig move, particularly for jack-up rigs—ensuring foundation integrity and safe positioning at the new location.

3 Main Phases

The surveys involve three main phases:

Pre-Move Site Investigation
Transit and Positioning
Post-Move Verification

Focus: safe tow route planning, anchor patterns, positioning QA/QC, and verification that the rig is correctly set up at the intended coordinates.

Pictures of Rig Move Activity

Transit

Positioning

Verification

Jack-up Rig Tow Route Anchor Pattern QA/QC

Next: Underwater Geographical Survey →

Underwater Geographical Survey

An underwater geographical survey (marine/hydrographic survey) precisely measures and describes water bodies and the underlying seabed—mapping depths, contours, subsurface geology, and natural/man-made features.

Core Components & Purposes

The survey is a critical initial step for almost all marine activities, including:

Safety and Navigation (Hydrography) — bathymetry and hazard identification for accurate nautical charts.
Infrastructure Development — data for offshore structures and subsea installations.
Resource & Environmental Assessment — seabed characterization for resources and ecological studies.

Supports: platforms & pipelines, subsea cables, wind farms, ports/jetties, bridge foundations, and exploration planning.

Pictures of Underwater Survey

Bathymetry

Side Scan

Sub-bottom

Hydrographic Bathymetry Seabed Imaging Geohazard

↑ Back to Top Services

Rig positioning

Dropcore Gravity

Survey Techniques

Core offshore survey methods and equipment used by M.V.M. Surveys

Bathymetry

Multi-Beam Echo Sounder (MBES)

Measures water depth and seafloor topography using acoustic travel time, producing high-resolution 3D seabed maps for offshore engineering and planning.

Details →