Journal article
A high-resolution, multi-sensor gamma-ray tool
AAPG bulletin, Vol.82(10), p1952
AAPG international conference and exhibition
Oct 1998
Abstract
Natural gamma-ray measurements provide one of the best means to investigate the cyclicity of sedimentary sequences, the variations in the amount and gross mineralogy of terrigenous sediments within a sequence, and it is the measurement of choice for correlating among different logging runs and between logging data and core measurements. The vertical resolution of gamma-ray logging tools is largely determined by: 1) logging speed; 2) vertical sampling rate; 3) detector dimensions; 4) logging and borehole environment (ship's heave, cable stretch, borehole diameter and fluid), and 5) characteristics of the gamma-ray source (strength, attenuation). We developed a new gamma-ray tool that will provide high vertical resolution gamma-ray measurements by addressing factors (1) to (4) above. The tool will employ an array of four small gamma-ray detectors together with a downhole accelerometer for precise determination of tool motion. The reduction in gamma-ray counts expected from decreased detector size will be offset by the increased number of detectors. The measurements from individual detectors will be stacked, taking into account oscillations in tool speed measured by the accelerometer. Results from tool response modeling in thin-bedded sequences and under varying conditions of platform heave and logging environments will be compared with initial field results. The high vertical resolution data to be obtained by this tool will be ideal for detailed characterization of turbidite and other cyclic sequences over a wide range of sedimentation rates, and will enhance our ability to integrate core measurements with logging data.
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Details
- Title
- A high-resolution, multi-sensor gamma-ray tool
- Creators
- Carlos Pirmez - Lamont-Doherty Earth Observatory Palisades, NY USA United StatesDavid GoldbergAleksandr MeltserAnonymous
- Publication Details
- AAPG bulletin, Vol.82(10), p1952
- Conference
- AAPG international conference and exhibition
- Publisher
- American Association of Petroleum Geologists
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Identifiers
- 991019296570804721