What is a log in geology?

What is a log in geology?

A written and/or graphic record of the geologic data obtained from drillhole core and/or cuttings. In noncore drilling, the cuttings are separated at depth intervals of about 1 m or 2 m and examined. In core drilling, the core is kept in sequence and examined.

What is an FMI log?

FMI (formation micro imager) logs can be directly determined the inverted changes of wellbore layers and formation structures and also was an important factor for stratifying layers and determining the lithology of oil and gas explorations that can be determined the wellbore fractures, inclination and direction by …

Why are borehole logs important?

The aim of borehole logging is to create a record of the in situ ground conditions. However, the recovery of material from the ground for inspection at the surface can result in disturbance of the materials, the degree of which will depend on the material type and the drilling method.

What are the types of logs?

Types of logs

  • Gamma ray logs.
  • Spectral gamma ray logs.
  • Density logging.
  • Neutron porosity logs.
  • Pulsed neutron lifetime logs.
  • Carbon oxygen logs.
  • Geochemical logs.

What is FMI image?

The FMI fullbore formation microimager provides real-time microresistivity formation images and dip data in water-based mud (WBM). FMI microimager data analysis identifies the maximum permeability direction in a fractured reservoir, which is important information for designing a completion for optimal production.

What does a borehole do?

A borehole may be constructed for many different purposes, including the extraction of water, other liquids (such as petroleum) or gases (such as natural gas), as part of a geotechnical investigation, environmental site assessment, mineral exploration, temperature measurement, as a pilot hole for installing piers or …

What are the main types of logging?

Logging is generally categorized into two categories: selective and clear-cutting.

  • Selective logging is selective because loggers choose only wood that is highly valued, such as mahogany.
  • Clear-cutting is not selective.
  • You may be wondering if selective logging is better for the forest than clear-cutting?

What are the types of well logs?

Wireline logs can be divided into broad categories based on the physical properties measured.

  • History.
  • Electrical logs.
  • Porosity logs.
  • Lithology logs.
  • Miscellaneous.
  • Logging while drilling.
  • Corrosion well logging.
  • Memory log.

What is FMI analysis?

FMI microimager data analysis identifies the maximum permeability direction in a fractured reservoir, which is important information for designing a completion for optimal production.

What can imageimage log data tell us about the borehole?

Image log data gives important information about the Shmin and SHmax directions. Hoop stresses acting along the circumference of the borehole wall causes breakouts, and the radial stresses result in tensile fractures known as drilling-induced fractures.

What is Geolog™?

A powerful borehole image analysis tool. Geolog™ provides extensive borehole image processing workflows and advanced analysis capabilities for both interactive interpretation and automatic detection of bedding dip, fracture analysis, classification of rock texture and quantitative image analyses.

What are the features of image log tools?

Image log tools are generally equipped with pads and are pressed against the borehole wall when lowered. Button electrodes (current (OBMI brochure—Schlumberger 2006 ). The effectiv e button size and effectiv e res- brochure—Schlumberger 2006 ). vertical as well as horizontal resolution of 0.2 in. Because of the micro-resistivity

What can image log data tell us about drilling-induced fractures?

Image log data give important information about the Shmin and SHmax directions. Hoop stresses acting along the circumference of the borehole wall causes breakouts and the radial stresses result in tensile fractures known as drilling-induced fractures.

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