Geomechanics and fluid flow effects on electric well logs: multiphysics modeling

Yeltsov, I. N.; Nazarova, Larisa; Nazarov, L. A.; Нестерова, Галина Владимировна; Sobolev, A.Y.; Эпов, М.И.

doi:10.1016/j.rgg.2014.05.020

Cited by 14 publications

(3 citation statements)

References 22 publications

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“…The S h min will be equal to the S h max in isotropic stratigraphy (Maleki et al, 2014); however, S h max is not equal to S h min in true formation, and the S h max and S h min difference ( σ = S h max -S h min ) will vary greatly due to the presence of major faults and active tectonics (Fig. 14) (Maleki et al, 2014;Yeltsov et al, 2014;Ju and Wang, 2018;Lai et al, 2019a).…”

Section: In Situ Stress Magnitudesmentioning

confidence: 99%

Structural diagenesis in ultra-deep tight sandstones in the Kuqa Depression, Tarim Basin, China

Lai

Dong

et al. 2022

Solid Earth

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Abstract. The Lower Cretaceous Bashijiqike Formation of the Kuqa Depression is made up of ultra-deeply buried sandstones in fold-and-thrust belts. Few researches have linked diagenetic processes with structure. To fill this gap, a comprehensive analysis integrating diagenesis with structure pattern, fracture and in situ stress is performed following a structural diagenetic approach. The results show that the pore spaces include residual intergranular pores, intergranular and intragranular dissolution pores, and micro-fractures. The sandstones experienced a high degree of mechanical compaction, but compaction is limited in well-sorted rocks or abundant in rigid quartz grains. The most volumetrically important diagenetic minerals are calcites. The framework grains experienced a varied degree of dissolution, and intergranular and intragranular dissolution pores are formed. Special attention is paid on the dissolution associated with the fracture planes. Large numbers of natural fractures are cemented by carbonate cements, which limit fluid flow. In addition, the presence of fracture enhances dissolution and the fracture planes are enlarged by dissolution. Cementation and dissolution can occur simultaneously in fracture surfaces, and the enlarged fracture surfaces can be cemented by late-stage cements. The in situ stress magnitudes are calculated using well logs. The horizontal stress difference (Δσ) determines the degree of mechanical compaction, and rocks associated with low Δσ experienced a low degree of compaction, and these contain preserved intergranular pores. Natural fractures are mainly related to the low Δσ layers. The presence of intergranular and intragranular dissolution pores is mainly associated with the fractured zones. The high-quality reservoirs with intergranular pores or fractures are related to low Δσ layers. The structural diagenesis researches above help the prediction of reservoir quality in ultra-deep sandstones and reduce the uncertainty in deep natural gas exploration in the Kuqa Depression.

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Section: In Situ Stress Magnitudesmentioning

confidence: 99%

Structural diagenesis in ultra-deep tight sandstones in the Kuqa Depression, Tarim Basin, China

Lai

Dong

et al. 2022

Solid Earth

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“…В результате усложнения итоговым вариантом стала модель с дополнительной прискважинной зоной с повышенным значением УЭС, предположительно связанной с уплотнением в результате бурения глубокозалегающего коллектора. Ее строение согласуется с результатами гидродинамического моделирования процесса фильтрации бурового раствора в пласт [Nazarova et al, 2013;Yeltsov et al, 2012Yeltsov et al, , 2014. Кроме того, выявляется частотная дисперсия электрических свойств, которая учитывается как разные значения диэлектрической проницаемости ε(ω) на частотах зондов ВИКИЗ (0.875, 1.75, 3.5, 7 и 14 МГц).…”

Section: примеры интерпретацииunclassified

Modern Algorithms and Software for Interpretation of Resistivity Logging Data

Эпов

Глинских

Никитенко

et al. 2021

Geodin. tektonofiz.

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The electrodynamics of geological media investigates the interrelations of resistivity logging signals and properties of fluid-containing rocks and creates innovative well logging technologies. Its development is inextricably linked with modern techniques for mathematical modeling and quantitative interpretation of high-precision data. In order to increase the information content of galvanic and electromagnetic logging, we have developed algorithms and software for numerical simulation and inversion of field data. In our study of the Cretaceous and Jurassic deposits of West Siberia, a quantitative interpretation of high-frequency electromagnetic and lateral logging signals was carried out. To create geoelectric models, we interpreted the field resistivity logging data by an unconventional quantitative technique based on their joint numerical inversion and estimations of the vertical resistivity of permeable deposits. Another line of our research was aimed at a scientific substantiation of a new technology for mapping and spatial tracking of lateral heterogeneities and oil-promising zones in the Bazhenov Formation. The aim was achieved by using the TEM sounding data on a spatially distributed system of directional and horizontal wells.

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“…The laboratory [32][33][34][35][36] and in-situ [37][38][39] researches prove the essential dependence of rock permeability on stresses. With increasing depth, this effect exerts stronger influence on efficiency of geophysical log data interpretation aimed to identify producing intervals and estimate poroperm properties of reservoir rocks [40,41].…”

Section: Introductionmentioning

confidence: 99%

A Method to Determine Stress-Dependent Filtration Properties of Fractured Porous Rocks by Laboratory Test Data

et al. 2019

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Within the dual porosity model the authors develop and theoretically, using synthetic data, substantiate the method for determining mass exchange coefficient and stress-dependent permeability of fractured porous reservoir rocks. The proposed filtration test circuit consists of three sequential measurements of flowrate in a specimen subjected to the varied external stress σ at the inlet fluid pressure P: by standard scheme (Q0) and with plugging of fissures at one (Q1) and at the other end (Q2) of the specimen. The model of the experiment is created, and the analytical solution is obtained for the direct problem on steady-state flow: dependences of Q0, Q1 and Q2 on σ and P. The input data are synthesized by superimposition of multiplicative noise on the exact solution of the direct problem. The synthesized data are used to derive the inversion relations for calculating the permeabilities k1 and k2 of fissures and matrix as well as the mass exchange coefficient by Q0, Q1 and Q2. Using LS method, the dependences k1(σ) and k2(σ) are reconstructed. The numerical experiments reveal low stability of inversion by input data. Thus, it is necessary to perform a cycle of measurements at the increasing input pressure with subsequent averaging of the results.

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Geomechanics and fluid flow effects on electric well logs: multiphysics modeling

Cited by 14 publications

References 22 publications

Structural diagenesis in ultra-deep tight sandstones in the Kuqa Depression, Tarim Basin, China

Structural diagenesis in ultra-deep tight sandstones in the Kuqa Depression, Tarim Basin, China

Modern Algorithms and Software for Interpretation of Resistivity Logging Data

A Method to Determine Stress-Dependent Filtration Properties of Fractured Porous Rocks by Laboratory Test Data

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