Seismic reflector imaging by prestack time migration in the Kakkonda geothermal field, Japan

Matsushima, Jun; Okubo, Yasukuni; Rokugawa, Shuichi; Yokota, Toshiyuki; Tanaka, Keiji; Tsuchiya, Terumitsu; Narita, Norifumi

doi:10.1016/s0375-6505(02)00052-4

Cited by 20 publications

(12 citation statements)

References 17 publications

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“…One may regard the scattered waves generated from heterogeneous media as a random noise in field seismic data. Some authors (e.g., Matsushima et al, 2003) have added random noise to their synthetic data for simulating field seismic data. However, the noise is a consequence of the wave phenomena in heterogeneous media, and is not same as the noise that randomly appears in the time-series (Levander and Gibson, 1991).…”

Section: Discussionmentioning

confidence: 99%

“…In this paper, we obtained PSTM sections using a diffraction stacking method proposed by Matsushima et al (2003). Figures 12a through 12c show PSTM sections for a RN model with different source/ receiver intervals at 80, 20, and 5 m, respectively.…”

Section: Prestack Time Migrated Sectionsmentioning

confidence: 99%

“…We can see that the S/ N ratio becomes larger with denser source/ receiver arrangements. Figures 13a through 13c show the PSTM sections using a diffraction stacking method (Matsushima et al, 2003) for a random heterogeneous model with a characteristic heterogeneity size of 10 m (a=10 m), as shown in Figure 1b with different source/ receiver intervals at 80, 20, and 5 m, respectively. Similarly, Figure 14 is the same as Figure 13 except for characteristic heterogeneity sizes of 50 m (a=50 m).…”

Section: Prestack Time Migrated Sectionsmentioning

confidence: 99%

“…A better image is obtained by PSDM when an accurate estimate of the velocity model exists; however, the advantage of PSTM is that it is robust and much faster than PSDM. From the viewpoint of the S/ N ratio, Matsushima et al (2003) discussed the advantages of prestack migration over synthetic data containing random noise.…”

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confidence: 99%

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Effects of Random Heterogeneity on Seismic Reflection Images

Matsushima¹

2012

Seismic Waves - Research and Analysis

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Section: Discussionmentioning

confidence: 99%

Section: Prestack Time Migrated Sectionsmentioning

confidence: 99%

Section: Prestack Time Migrated Sectionsmentioning

confidence: 99%

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confidence: 99%

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Effects of Random Heterogeneity on Seismic Reflection Images

Matsushima¹

2012

Seismic Waves - Research and Analysis

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“…Наиболее вероятной причиной образования плотностной границы расслоения в земной коре следует считать воздействие на вещество недр теп-лового потока различной интенсивности, который, собственно, и привел к преобразованию вещества [Matsushima et al, 2003;Golubev, 2009;и др.]. Распре-деление пунктов наблюдения теплового потока для территории северо-востока России крайне не-равномерно.…”

Section: методика исследованияunclassified

Assessment of the Localization of Hypocenters of Crustal Earthquakes Relative to the Depth and Relief of the Border Density Stratification in the Crust of the Northeastern Section of the Reference Geological-Geophysical Profile 3-Dv

Gaidai¹

2017

Geodin. tektonofiz.

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Abstract:The total length of the seismic profiles in the northeastern regions of Russia and, accordingly, the area of the territories covered by the seismic data interpretations, remains insignificant in comparison with the total area of these regions. At the same time, the geological objects in the northeastern regions attract much attention in view of their prospects, including potential mineral resources. The challenge is to construct the regional models of the crust structure without deep seismic survey data, and to analyze the regional seismicity that depends on the features of the deep crust structure. We develop a density model of the crust structure using the new interpretational gravimetry method. The density modeling results show that the density changes in the crust can be used to estimate the position of a surface separating the lower (quasi-homogeneous) and upper (heterogeneous) parts of the crust, i.e. to assess the density boundary of stratification. This boundary is formed due to a complex of physical and chemical processes that facilitate the transition of the material in the lower part of the crust into the quasi-uniform (homogeneous) state. The study area is the junction zone of the Ayan-Yuryakh anticlinorium and Inyali-Debin synclinorium (62-63°N, 148-152° E). The initial interpretation of the deep seismic survey data on the reference geological-geophysical profile 3-DV was available, so the ambiguity of the density modeling was reduced. In turn, the density modeling results can provide additional information for geological-geophysical interpretation of the DSS results on the sites wherein the seismic profiles go along the fault zones. The relationship between seismic events and the relief of the density boundary of stratification in the crust was studied quantitatively on the basis of the data from the regional catalog of seismic events and the results of the earlier analysis of seismicity in the study area. The analysis shows that 74 % hypocenters are located above the density boundary of stratification. The earthquake hypocenters located at depths ranging from 20 to 35 km are usually confined to the systems of long-living regional crustal faults and occur below the density boundary of stratification. The energy class of such earthquakes does not exceed 9. In the study area, the seismically active zones are mainly confined to the areas of subduction of the density boundary of stratification. Most of the earthquake epicenters (80 %) occur in the zones where the gradient of the relief change of the density boundary does not exceed 1. The number of recorded seismic events practically reduces to zero in the regions where the dip angle of the density boundary exceeds 65°.

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Fluid Pocket Generation in Response to Heterogeneous Reactivity of a Rock Fracture Under Hydrothermal Conditions

Okamoto

Tanaka

Watanabe

et al. 2017

Geophysical Research Letters

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Fractures are the location of various water‐rock interactions within the Earth's crust; however, the impact of the chemical heterogeneity of fractures on hydraulic properties is poorly understood. We conducted flow‐through experiments on the dissolution of granite with a tensile fracture at 350°C and fluid pressure of 20 MPa with confining pressure of 40 MPa. The aperture structures were evaluated by X‐ray computed tomography before and after the experiments. Under the experimental conditions, quartz grains dissolve rapidly to produce grain‐scale pockets on the fracture surface, whereas altered feldspar grains act as asperities to sustain the open cavities. The fracture contained gouge with large surface area. The feedback between fluid flow and the rapid dissolution of gouge material produced large fluid pockets, whereas permeability did not always increase significantly. Such intense hydrological‐chemical interactions could strongly influence the porosity‐permeability relationship of fractured reservoirs in the crust.

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Seismic reflector imaging by prestack time migration in the Kakkonda geothermal field, Japan

Cited by 20 publications

References 17 publications

Effects of Random Heterogeneity on Seismic Reflection Images

Effects of Random Heterogeneity on Seismic Reflection Images

Assessment of the Localization of Hypocenters of Crustal Earthquakes Relative to the Depth and Relief of the Border Density Stratification in the Crust of the Northeastern Section of the Reference Geological-Geophysical Profile 3-Dv

Fluid Pocket Generation in Response to Heterogeneous Reactivity of a Rock Fracture Under Hydrothermal Conditions

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