Evaluation of Vertical Fracture Propagation Using Combined Spectral Noise Logging and High Precision Temperature Logging Data in a Low Permeability Sandstone Reservoir, Western Kaz (Russian)

As the critical parameter of hydraulic fracture evaluation, fracture density is significant for fracturing model optimization and production prediction. To compensate for the low response sensitivity of fracture density and the saturation of fracture evaluation in nonradioactive technology (NRT), we have developed a method based on modifying the neutron self-shielding effect to quantitatively calculate fracture density. The gamma counts of elements with content that did not change before and after fracturing were used to calculate the self-shielding correction factor. We established the mathematical relationship between the corrected gamma counts of boron and fracture density to achieve a quantitative calculation of fracture density. Compared to NRT, the new method used measured energy spectral information to eliminate the effect of neutron self-shielding on fracture density and improve calculation accuracy. Meanwhile, the scope or range of accurate fracture density estimation extended from the original 4% to more than 10%. Moreover, we further examined fracture response under different formations and borehole conditions using the Monte Carlo N-particle transport code. The salinity of formation water and borehole water had the most significant impact on fracture density calculation, shale content and porosity, lithology, and fluid type of formation; in contrast, borehole parameters were the least significant. Finally, in this paper, we illustrated the feasibility of the method through a continuous-depth numerical calculation.

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A quantitative calculation method for fracture density using the neutron self-shielding modification and neutron-induced gamma logging

Zhang

Chen

Liu

et al. 2022

GEOPHYSICS

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Evaluation of Vertical Fracture Propagation Using Combined Spectral Noise Logging and High Precision Temperature Logging Data in a Low Permeability Sandstone Reservoir, Western Kaz (Russian)

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A quantitative calculation method for fracture density using the neutron self-shielding modification and neutron-induced gamma logging

A quantitative calculation method for fracture density using the neutron self-shielding modification and neutron-induced gamma logging

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