Rock Lab Analysis
Exploration Technique: Rock Lab Analysis
|Exploration Technique Information|
|Exploration Group:||Lab Analysis Techniques|
|Exploration Sub Group:||Rock Lab Analysis|
|Parent Exploration Technique:||Lab Analysis Techniques|
|Information Provided by Technique|
|Lithology:||Core and cuttings analysis is done to define lithology. Water rock interaction. Can determine detailed information about rock composition and morphology. Density of different lithologic units. Rapid and unambiguous identification of unknown minerals.|
|Stratigraphic/Structural:|| Core analysis can locate faults or fracture networks.
Oriented core can give additional important information on anisotropy. Historic structure and deformation of land.
|Thermal:||Thermal conductivity can be measured from core samples.|
Various rock lab analyses are commonly used in geothermal exploration to understand the geologic and thermal history of an area, study hydrothermal alteration produced by past (or present) interactions between host rocks and thermal fluids, define and evaluate the characteristics of a geothermal reservoir, and ultimately “prove” the quality of a geothermal resource. Analysis of core, cuttings, and surface rock samples begins with identification of the general characteristics of the sample, which typically includes lithology, porosity, and fluid content. Select samples are then sent to labs for a more detailed investigation.
Analysis of radioactive and stable isotopes in rock samples can be used to investigate the thermal history of a reservoir, to determine the degree of water-rock interaction that has occurred in a system, and to date hydrothermal alteration minerals. Petrographic analysis of thin sections prepared from rock samples is critical when trying to learn about a rock, reservoir, or formation of interest, and can be used to obtain information regarding rock textures, alteration mineralogy, and thermal history of a sample.
X-ray powder diffraction may be used to determine the bulk composition of a sample or to rapidly identify unknown crystalline substances (typically in less than 20 minutes). In geothermal exploration, this technique may be used to confidently distinguish fine-grained minerals, such as different clays and mixed layer clays that are optically similar, but form from distinctly different weathering and hydrothermal alteration processes. X-ray fluorescence may also be used to analyze the bulk chemistry of rock, mineral, and sediment samples. Recent technological advances have enabled application of these techniques in the field, eliminating the need to send samples for analysis in a laboratory setting.
- Lab Analysis Techniques
- Fluid Lab Analysis
- Rock Lab Analysis
No exploration activities found.