Well log analysis

Allen, D.F, Anderson, B, Barber T., Liu, Q.X, Luling, M. Supporting the interpretation of complex axisymmetric invasion by modeling wireline induction and 2-MHz LWD resistivity tools. Paper U, in 34th Annual Logging Symposium Transactions. Society of Professional Well Log Analysys, Ul-21, 1993. 

Table I. Flow Chart for Well Log Analysis and Reservoir Characterization... 

Lanning, E.N. and Johnson, D.M., "Automated Identification of Rock Boundaries An Application of the Walsh Transform to Geophysical Well-log Analysis", Geophysics, Vol. 48, No. 2, (1983)... 

Analytical Methods for Time Lapse Well Logging Analysis 353... 

The example in Fig. 5.21 shows a composed carbonate section." Data are taken with friendly permission of AAPG from a case study in the book Basic Well Log Analysis from Asquith and Krygowski (2004). The profile consists of carbonate rocks with mixed lithology. Cored sections show fractured... 

Asquith, G., Krygowski, D., 2004. Basic Well Log Analysis, second ed. In AAPG Methods in Exploration Series, 16. American Association of Petroleum Geologists, Tulsa. 

The process monitors and controllers typically also have the capabiUty for data logging, analysis, and display. This capabiUty has made on-line control of pilot plants, as well as commercial-scale processes, desirable. Pilot-plant appHcations for on-line control have been described (106), and the use of such systems for both monitoring and process diagnosis has been discussed (107). A number of commercially available process control programs that mn on microprocessors have been reviewed (108). Virtually all of them incorporate graphic display as an integral part of the interactive capabiUty of the program. 

NMR Well Logging and Fluid Analysis 3.6.2.1 NMR Wire-line Logging... 

NMR has proven to be a valuable tool for formation evaluation by well logging, downhole fluid analysis and laboratory rock characterization. It gives a direct measure of porosity as the response is only from the fluids in the pore space of the rock. The relaxation time distribution correlates with the pore size distribution. This correlation makes it possible to estimate permeability and irreducible water saturation. When more than one fluid is present in the rock, the fluids can be identified based on the difference in the fluid diffusivity in addition to relaxation times. Interpretation of NMR responses has been greatly advanced with the ability to display two distributions simultaneously. 

The discrepancy between the number of well logs and the number of water chemistry results indicates that roughly 50% of well owners did not submit a water quality sample to the DENV for analysis and redeem their Water Quality Analysis Voucher over the reporting period. 

There is a suite of related applications involving signal processing. Whether the data are from images, oil well-logging devices, or military sensor systems, the problems are the same vast amounts of data, only some of which are amenable to numerical analysis. Yet experts derive valid interpretations from the data. Systems have already been built to capture this expertise. 

The isotope cahfomium-252 undergoes spontaneous fission generating neutrons. It serves as a convenient source of neutrons for neutron activation analysis, neutron moisture gages, and in the determination of water and oilbearing layers in well-logging. It is expected to have many other potential applications, including synthesis of other heavy isotopes. 

Califomium-252 is an intense neutron source. One gram emits 2.4 x 1012 neutrons per second. This isotope shows promise for applications in neutron activation analysis, neutron radiography, and as a portable source for field use in mineral prospecting and oil well logging. 

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