A Diffusion-Corrected Sigma Algorithm for a Four-Detector Pulsed-Neutron Logging Tool

2018 ◽  
Author(s):  
Gregory Schmid ◽  
Richard Pemper ◽  
Darrell Dolliver ◽  
Natasa Mekic ◽  
Jon Musselman
Keyword(s):  
Pulsed Neutron ◽  
Logging Tool

Field Test Results in Malaysia Wells of a New-Generation Slim Pulsed Neutron Logging Tool

2017 ◽  
Author(s):  
P. Millot ◽  
F. K. Wong ◽  
D. A. Rose ◽  
T. Zhou ◽  
R. Grover ◽  
...  
Keyword(s):  
Field Test ◽  
Test Results ◽  
New Generation ◽  
Pulsed Neutron ◽  
Logging Tool

Field Applications of the New Multidetector Slim Pulsed Neutron Logging Tool: Oman Case Studies

2016 ◽  
Author(s):  
A. H. Al-Yaarubi ◽  
D. A. Rose ◽  
T. Zhou ◽  
G. Gonzalez ◽  
P. A. Lombardi ◽  
...  
Keyword(s):  
Case Studies ◽  
Pulsed Neutron ◽  
Logging Tool

INTRINSIC CARBON-OXYGEN LOGGING FOR ENHANCED CONSISTENCY OF RESERVOIR SATURATION MONITORING

2021 ◽  
Author(s):  
Shouxiang Mark Ma ◽  
◽  
Nacer Guergueb ◽  
Weijun Guo ◽  
Mahmoud Eid ◽  
...  
Keyword(s):  
Quality Control ◽  
Monte Carlo ◽  
Case Studies ◽  
Fresh Water ◽  
Raw Data ◽  
Oil Saturation ◽  
Physical Tests ◽  
Simulated Case ◽  
Pulsed Neutron ◽  
Logging Tool

Pulsed neutron carbon-oxygen (C/O) logging is a valuable measurement for dynamic reservoir saturation monitoring, especially in mixed salinity and fresh-water environments. Currently, all C/O logs are based on apparent C/O measurements, thus responses of raw data are not comparable between different tools. Tool-specific calibrations are used to convert apparent C/O log to reservoir oil saturation; the objective of C/O logging. In this paper, a new concept of intrinsic C/O logging is introduced so that raw data from different tools can be compared for enhanced log quality control and consistency of raw data and their applications. For a given system of rock, oil, and water, intrinsic carbon (C) and oxygen (O), thus C/O ratio, are theoretically calculated. For the same system, apparent C/O ratio measured by a generic C/O logging tool is also obtained using existing apparent C/O methodology. A correlation between the two is established, enabling an intrinsic C/O log output. Eleven laboratory physical tests and 120 Monte Carlo simulated case studies are conducted. Systems investigated include sandstone and limestone with different porosities and fluid saturations. Borehole sizes are 6 and 8 inches, and borehole fluids are water, oil, and their mixtures. Correlations between intrinsic and apparent C/O are established and concept of intrinsic C/O logging is verified.

Saturation and Sigma Measurements in Carbonate Formations with Multiple Pulsed Neutron Technologies: Case Study from Southeast Turkey

2021 ◽  
Author(s):  
Coskun Bulut ◽  
Halil Ibrahim Dagdeviren ◽  
Ana-Maria Elena Andronache ◽  
Natasa Mekic ◽  
Richard R Pemper
Keyword(s):  
Single Mode ◽  
Complete Agreement ◽  
Evaluation Tool ◽  
Reservoir Evaluation ◽  
Single Detector ◽  
Southeast Anatolia ◽  
Carbonate Formations ◽  
Pulsed Neutron ◽  
Logging Tool

Abstract This paper describes the petrophysical analysis resulting from operation of two independent pulsed neutron logging tools in the same cased hole well. The well was primarily carbonate and included many different subsurface formations located in the Southeast Anatolia Region of Turkey that included the Derdere, Karababa A, B, and C, Karaboğaz, Bozova, and Germav. Computing the mineralogy and saturation in these environments is challenging due to the complexity and low porosity of the formations that included mixed lithologies and organic shale. One of the objectives of this work was to demonstrate how the spectral data from the two tools was not only consistent, but that they could be combined to create an optimal petrophysical interpretation of the lithology, detailed mineralogy, porosity, and saturation of the formations within the well. Both tools employed a pulsed neutron generator capable of emitting 2 x 108 neutrons/second into the ambient formation. One was a 4-detector, 1-11/16-inch diameter reservoir evaluation tool, and the other was a single detector, 3-1/4-inch geochemical spectroscopy tool. In order to obtain the best possible results, a sound logging program was created that involved running the reservoir evaluation tool in 3 different modes of operation. This included the carbon/oxygen (C/O) mode, the sigma mode, and the gas mode. Stationary measurements were also obtained. The geochemical logging tool has only a single mode of operation. The resulting sigma measurements were in complete agreement. The sigma from the geochemical logging tool was corrected for the effects of diffusion. The advantage of the slim-hole reservoir evaluation tool is that the measurements from the 4th detector are diffusion-free. Data from the 1-11/16-inch reservoir evaluation tool from the gas mode did not reveal any bypassed gas zones in the well. Oil saturation was computed with the reservoir evaluation tool based upon three logging passes in the C/O mode. An important component of the interpretation was that it was supported by MCNP modeling that predicted the tool's response for hydrocarbon saturation. Although data from the geochemical spectroscopy tool was not used to determine saturation in this well, the resulting carbon concentration, that included kerogen as well as hydrocarbons, was completely consistent with the saturation computed from the reservoir evaluation tool.

A New Cased-Hole Porosity Measurement for a Four-Detector Pulsed-Neutron Logging Tool

2019 ◽  
Author(s):  
Gregory Schmid ◽  
Richard Pemper ◽  
Darrell Dolliver ◽  
Natasa Mekic ◽  
Jon Musselman
Keyword(s):  
Pulsed Neutron ◽  
Logging Tool

Local atomic structure of relaxor ferroelectric solids studied by pulsed neutron scattering

1994 ◽  
Vol 52 ◽  
pp. 554-555
Author(s):  
T. Egami ◽  
H. D. Rosenfeld ◽  
S. Teslic
Keyword(s):  
Neutron Scattering ◽  
Atomic Structure ◽  
Argonne National Laboratory ◽  
Relaxor Ferroelectrics ◽  
Relaxor Ferroelectric ◽  
Crystallographic Structure ◽  
Chemical Inhomogeneity ◽  
Distribution Analysis ◽  
Ferroelectric Transition ◽  
Pulsed Neutron

Relaxor ferroelectrics, such as Pb(Mg1/3Nb2/3)O3 (PMN) or (Pb·88La ·12)(Zr·65Ti·35)O3 (PLZT), show diffuse ferroelectric transition which depends upon frequency of the a.c. field. In spite of their wide use in various applications details of their atomic structure and the mechanism of relaxor ferroelectric transition are not sufficiently understood. While their crystallographic structure is cubic perovskite, ABO3, their thermal factors (apparent amplitude of thermal vibration) is quite large, suggesting local displacive disorder due to heterovalent ion mixing. Electron microscopy suggests nano-scale structural as well as chemical inhomogeneity.We have studied the atomic structure of these solids by pulsed neutron scattering using the atomic pair-distribution analysis. The measurements were made at the Intense Pulsed Neutron Source (IPNS) of Argonne National Laboratory. Pulsed neutrons are produced by a pulsed proton beam accelerated to 750 MeV hitting a uranium target at a rate of 30 Hz. Even after moderation by a liquid methane moderator high flux of epithermal neutrons with energies ranging up to few eV’s remain.

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