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Related Concept Videos

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

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Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
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GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
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Related Experiment Video

Updated: Apr 19, 2026

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A novel method for quantitative geosteering using azimuthal gamma-ray logging.

Chao Yuan1, Cancan Zhou1, Feng Zhang2

  • 1Department of Well Logging and Remote Sensing Technology, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|December 6, 2014
PubMed
Summary

A new geosteering method uses azimuthal gamma-ray logs to predict relative dip angles and calculate distances to formation boundaries. This enables precise real-time drilling adjustments for improved reservoir navigation.

Keywords:
Azimuthal gamma-ray loggingGeosteeringMonte Carlo simulationQuantitative methodReal-time data

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Area of Science:

  • Geosciences
  • Petroleum Engineering
  • Well Logging

Background:

  • Geosteering is crucial for optimizing reservoir drainage and wellbore placement.
  • Accurate real-time formation dip angle prediction remains a challenge in geosteering.

Purpose of the Study:

  • To propose a novel quantitative geosteering method using azimuthal gamma-ray logging.
  • To enable real-time prediction of relative dip angles and distances to formation boundaries.

Main Methods:

  • Monte Carlo simulations were used to model azimuthal gamma-ray responses.
  • Analysis of real-time up and bottom gamma-ray logs during tool traversal across boundary surfaces.

Main Results:

  • Up and bottom gamma-ray log responses indicate relative dip angles when approaching radioactive formations.
  • The predicted dip angles allow for calculation of the distance from the drilling bit to the boundary surface.

Conclusions:

  • The proposed method offers a quantitative approach to geosteering.
  • Azimuthal gamma-ray logging provides valuable data for real-time geosteering decisions and wellbore placement.