7 services found

Landtech Geophysics Ltd services

Passive Seismic Tomography (PST) Services

Passive Seismic Tomography (PST) is a new revolutionary geophysical exploration technique utilizing the natural microseismicity, (microearthquakes with magnitudes of -1 up to 2.0 Richter) which occur almost everywhere, as seismic sources and a portable specially designed network of seismometers on the surface to record continuously for a period of a few months.LandTech was the first company which introduced the method of high resolution passive seismic tomography for hydrocarbon exploration at a local scale, back in 1998. In addition to the specific hardware it has designed new inversion algorithms and neural network or fuzzy procedures for the reliable processing of the acquired passive data.After determining the hypocenters of microearthquakes we use them as seismic sources embedded within or below the target of interest and perform 3D seismic tomographic inversion of the P- and S-wave travel times to the surface recorders.

Special Seismic Services

LandTech’s special seismic services are designed to improve resolution and imaging in complex geological and topography settings (e.g. thrust belts), characterized by high velocity shallow layers, sharp lateral velocity variations, reverse velocity vertical gradients etc, where the quality of the seismic data is often poor or very poor, by applying innovative seismic data collection and processing techniques that will directly address the key issues which traditionally plague seismic data collected in these areas.

Reservoir Induced Seismiciby Services

Hydraulic fracturing is a well stimulation process used to release oil, natural gas, geothermal energy, and even water from `tight` underground formations to maximize the extraction of these resources. Hydraulic fracturing is used by the oil and gas industry to fracture low permeability, resource-bearing subsurface rock to allow oil or natural gas to move more freely from the rock pores to production wells that bring the oil or gas to the surface.

Gravity Surveys Services

LandTech has performed Gravity surveys since 1998. The LandTech team has developed techniques that combine the latest in GPS, Gravity meters and computing technology, to provide accurate and cost-effective surveys. The latest CG5 Scintrex Gravity Meters are used by LandTech.Our survey operations span the globe, having successfully undertaken major contracts in 9 countries on 5 continents. Thousands of gravity stations have been surveyed. LandTech’s reputation for precision field work is a direct result of the overriding commitment to survey quality by our dedicated staff of internationally experienced surveyors, engineers and gravity technicians.

Magnetotellurics (MT) Services

The realization that Magnetotellurics (MT) data can provide complementary information to that derived from seismic exploration. For example, the diffusive signal propagation used in MT can be an advantage in a region of intense fracturing. While seismic signals will be scattered, the MT signals diffuse and give a reliable estimate of bulk properties such as porosity. Just as in seismic exploration, electromagnetic geophysics can contribute to effective hydrocarbon exploration in two distinct ways.

Coal b Coal Bed Mebhane Services

Drilling is the traditional and still the most common method used in coal exploration. Most coal companies rely heavily on borehole data to evaluate their mine properties. However for the Underground Coal Gasification (UCG) and Coal Bed Methane (CBM) it is necessary to map the subsurface coal and to detect other spatial properties of the coal seam with a high degree of accuracy. Here the geophysical technology plays a vital role. The following are some of the geotechnical methods employed in the international arena:

Geobhermal Explorabion Services

In the evaluation of a geothermal resource it is critical to know the reservoir geometry, temperature, saturation, state of saturants, pore pressure, porosity and permeability. These are the parameters which will determine the production feasibility and cost effectiveness of a geothermal prospect. The increasing sophistication of seismic wave data collection and processing and recent experimental work on factors governing wave propagation in rocks has stimulated increased interest in the use of seismic techniques to determine the on site physical state of crustal rocks for engineering applications.Passive Seismic Tomography (PST) can also be successfully used to investigate geothermal reservoirs. The Vp/Vs ratio observed in active geothermal areas depends upon the rock matrix, porosity, pore fluid content, pore pressure, temperature, and pore shape.