Joint tomography of multi-cross-hole and borehole-to-surface seismic data for karst detection

Peng, Daicheng; Cheng, Fei; Liu, Jiangping; Zong, Yuquan; Yu, Mingyu; Hu, Guang; Xiong, Xuanxi

doi:10.1016/j.jappgeo.2020.104252

Cited by 8 publications

(5 citation statements)

References 28 publications

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“…The resolution tomography process is strongly in uenced by the illumination of the wave's rays that pass through an area. (Marti et al, 2002; Wang and Rao 2006; Peng et al, 2021), In this research, we conducted specialized design acquisition targeting ray density of more than ten rays that passed through the cells around the main target area Lembang Fault, so it is a su cient number of wave rays in each cell (2 km) which is could well illuminate the geometry of the Lembang Fault with a fairly high resolution. Due to the limited recording instruments available (15 seismometer), to cover 40 X 20 km survey area with resolution 2 km is need special approach to get higher than 10 rays for every cell.…”

Section: Resultsmentioning

confidence: 99%

High Resolution 3D Shallow Crustal Structure of the Lembang Fault, West Java, Indonesia, produced with Ambient Noise Tomography

Syaifuddin

Nugraha

Zulfakriza

et al. 2022

Preprint

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The Lembang Fault is located about eight km north of Bandung City, the capital city of the West Java province of Indonesia, with about 8.79 million people (dated 2020). Several studies state that the Lembang fault is an active fault with a maximum magnitude of 6.5 to 7. In terms of earthquake disaster mitigation, distinguishing characteristics of seismic velocity structures around active faults is critical. This manuscript presents our new research on ambient seismic noise tomography around the Lembang Fault by deploying 73 local temporary seismometer networks to develop a 3D high-resolution shear wave velocity model. We conducted a design acquisition analysis to obtain optimal results using a ray density analysis approach to image the geometry of the Lembang fault with good illumination and resolution, which is essential for identifying shallow geological features. Our result showed that variations in velocity values, both laterally and vertically, were related to variations in the volcanic rock on the near-surface. The geometry of the Lembang Fault and the existence of a low-velocity zone are well-identified from the seismic velocity structure, which low-velocity zone area has the potential for amplifying earthquake waves during an earthquake.

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Section: Resultsmentioning

confidence: 99%

High Resolution 3D Shallow Crustal Structure of the Lembang Fault, West Java, Indonesia, produced with Ambient Noise Tomography

Syaifuddin

Nugraha

Zulfakriza

et al. 2022

Preprint

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“…Surface seismic methods are suitable for near-surface conditions; however, they face challenges in transmitting sufficient energy through the weathered zone to desired depths due to the strong attenuation of seismic waves in unsaturated, unconsolidated sediments [1][2][3]. The cross-hole seismic imaging method has gained wide utilization in geotechnical engineering parameter calculation [4], tunnel and cavity detection [5][6][7], hydrogeology surveys [8][9][10], rock and aquifer distribution detection [11][12][13], reservoir descriptions [14][15][16], rock fragmentation descriptions [17], civil engineering [18], detection of hydrocarbon reservoirs [19][20][21] and so on. Despite this, this method also has deficiencies; for example, when cross-hole seismic receivers are arranged near the target body, the wavefield in profile between two wells is greatly influenced due to the medium inhomogeneity (especially the high-velocity target) in 3D space, leading to image distortion [22].…”

Section: Introductionmentioning

confidence: 99%

3D Reverse-Time Migration Imaging for Multiple Cross-Hole Research and Multiple Sensor Settings of Cross-Hole Seismic Exploration

Cheng,

Peng,

Yang

2024

Sensors

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The two-dimensional (2D) cross-hole seismic computed tomography (CT) imaging acquisition method has the potential to characterize the target zone optimally compared to surface seismic surveys. It has wide applications in oil and gas exploration, engineering geology, etc. Limited to 2D hole velocity profiling, this method cannot acquire three-dimensional (3D) information on lateral geological structures outside the profile. Additionally, the sensor data received by cross-hole seismic exploration constitute responses from geological bodies in 3D space and are potentially affected by objects outside the well profiles, distorting the imaging results and geological interpretation. This paper proposes a 3D cross-hole acoustic wave reverse-time migration imaging method to capture 3D cross-hole geological structures using sensor settings in multi-cross-hole seismic research. Based on the analysis of resulting 3D cross-hole images under varying sensor settings, optimizing the observation system can aid in the cost-efficient obtainment of the 3D underground structure distribution. To verify this method’s effectiveness on 3D cross-hole structure imaging, numerical simulations were conducted on four typical geological models regarding layers, local high-velocity zones, large dip angles, and faults. The results verify the model’s superiority in providing more reliable and accurate 3D geological information for cross-hole seismic exploration, presenting a theoretical basis for processing and interpreting cross-hole data.

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“…Cross-hole tomography has been used in mining exploration (Wong, 2000), aquifer delineation, and hydrology-related topics (Hubbard and Rubin, 2000;Daley et al, 2004;Dietrich and Tronicke, 2009;Linder et al, 2010;von Ketelhodt et al, 2018). It has also been used to characterise a host rock and its smallscale structures such as fault planes (Maurer and Green, 1997;Rumpf and Tronicke, 2014;Doetsch et al, 2020;Shakas et al, 2020) and to investigate pore pressure variations in aquifers and caprocks (Daley et al, 2008;Marchesini et al, 2017;Grab et al, 2022) as well as voids in karst regions (Duan et al, 2017;Kulich and Bleibinhaus, 2020;Peng et al, 2021). Furthermore, Gusmeroli et al (2010) and Axtell et al (2016) used GPR-based travel-time tomography to estimate the water content in a polythermal glacier.…”

Section: Introductionmentioning

confidence: 99%

A borehole trajectory inversion scheme to adjust the measurement geometry for 3D travel-time tomography on glaciers

et al. 2023

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Abstract. Cross-borehole seismic tomography is a powerful tool to investigate the subsurface with a very high spatial resolution. In a set of boreholes, comprehensive three-dimensional investigations at different depths can be conducted to analyse velocity anisotropy effects due to local changes within the medium. Especially in glaciological applications, the drilling of boreholes with hot water is cost-efficient and provides rapid access to the internal structure of the ice. In turn, movements of the subsurface such as the continuous flow of ice masses cause deformations of the boreholes and complicate a precise determination of the source and receiver positions along the borehole trajectories. Here, we present a three-dimensional inversion scheme that considers the deviations of the boreholes as additional model parameters next to the common velocity inversion parameters. Instead of introducing individual parameters for each source and receiver position, we describe the borehole trajectory with two orthogonal polynomials and only invert for the polynomial coefficients. This significantly reduces the number of additional model parameters and leads to much more stable inversion results. In addition, we also discuss whether the inversion of the borehole parameters can be separated from the velocity inversion, which would enhance the flexibility of our inversion scheme. In that case, updates of the borehole trajectories are only performed if this further reduces the overall error in the data sets. We apply this sequential inversion scheme to a synthetic data set and a field data set from a temperate Alpine glacier. With the sequential inversion, the number of artefacts in the velocity model decreases compared to a velocity inversion without borehole adjustments. In combination with a rough approximation of the borehole trajectories, for example, from additional a priori information, heterogeneities in the velocity model can be imaged similarly to an inversion with fully correct borehole coordinates. Furthermore, we discuss the advantages and limitations of our approach in the context of an inherent seismic anisotropy of the medium and extend our algorithm to consider an elliptic velocity anisotropy. With this extended version of the algorithm, we analyse the interference between a seismic anisotropy in the medium and the borehole coordinate adjustment. Our analysis indicates that the borehole inversion interferes with seismic velocity anisotropy. The inversion can compensate for such a velocity anisotropy. Based on the modelling results, we propose considering polynomials up to degree 3. For such a borehole trajectory inversion, third-order polynomials are a good compromise between a good representation of the true borehole trajectories and minimising compensation for velocity anisotropy.

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Joint tomography of multi-cross-hole and borehole-to-surface seismic data for karst detection

Cited by 8 publications

References 28 publications

High Resolution 3D Shallow Crustal Structure of the Lembang Fault, West Java, Indonesia, produced with Ambient Noise Tomography

High Resolution 3D Shallow Crustal Structure of the Lembang Fault, West Java, Indonesia, produced with Ambient Noise Tomography

3D Reverse-Time Migration Imaging for Multiple Cross-Hole Research and Multiple Sensor Settings of Cross-Hole Seismic Exploration

A borehole trajectory inversion scheme to adjust the measurement geometry for 3D travel-time tomography on glaciers

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