scholarly journals Application of Double-Difference Seismic Tomography to Carbon Sequestration Monitoring at the Aneth Oil Field, Utah

Minerals ◽  
2013 ◽  
Vol 3 (4) ◽  
pp. 352-366
Author(s):  
Brent Slaker ◽  
Erik Westman ◽  
Kray Luxbacher ◽  
Nino Ripepi
Keyword(s):  
Carbon Sequestration ◽  
Seismic Tomography ◽  
Oil Field ◽  
Double Difference

scholarly journals Structure-controlled asperities of the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes, NE Tibet, China, revealed by high-resolution seismic tomography

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Quan Sun ◽  
Shunping Pei ◽  
Zhongxiong Cui ◽  
Yongshun John Chen ◽  
Yanbing Liu ◽  
...  
Keyword(s):  
High Resolution ◽  
Seismic Tomography ◽  
High Velocity ◽  
Three Dimensional ◽  
Large Earthquake ◽  
Velocity Model ◽  
Tectonic Stress ◽  
Double Difference ◽  
Source Regions ◽  
Large Earthquakes

AbstractDetailed crustal structure of large earthquake source regions is of great significance for understanding the earthquake generation mechanism. Numerous large earthquakes have occurred in the NE Tibetan Plateau, including the 1920 Haiyuan M8.5 and 1927 Gulang M8 earthquakes. In this paper, we obtained a high-resolution three-dimensional crustal velocity model around the source regions of these two large earthquakes using an improved double-difference seismic tomography method. High-velocity anomalies encompassing the seismogenic faults are observed to extend to depths of 15 km, suggesting the asperity (high-velocity area) plays an important role in the preparation process of large earthquakes. Asperities are strong in mechanical strength and could accumulate tectonic stress more easily in long frictional locking periods, large earthquakes are therefore prone to generate in these areas. If the close relationship between the aperity and high-velocity bodies is valid for most of the large earthquakes, it can be used to predict potential large earthquakes and estimate the seismogenic capability of faults in light of structure studies.

Passive seismic tomography using recorded microseismicity: Application to mining-induced seismicity

Geophysics ◽  
2019 ◽  
Vol 84 (1) ◽  
pp. B41-B57 ◽  
Author(s):  
Himanshu Barthwal ◽  
Mirko van der Baan
Keyword(s):  
Seismic Tomography ◽  
Velocity Model ◽  
P Wave ◽  
Double Difference ◽  
Lateral Velocity ◽  
Study Region ◽  
Arrival Times ◽  
3D Velocity Model ◽  
Passive Seismic ◽  
Dip Angle

Microseismicity is recorded during an underground mine development by a network of seven boreholes. After an initial preprocessing, 488 events are identified with a minimum of 12 P-wave arrival-time picks per event. We have developed a three-step approach for P-wave passive seismic tomography: (1) a probabilistic grid search algorithm for locating the events, (2) joint inversion for a 1D velocity model and event locations using absolute arrival times, and (3) double-difference tomography using reliable differential arrival times obtained from waveform crosscorrelation. The originally diffusive microseismic-event cloud tightens after tomography between depths of 0.45 and 0.5 km toward the center of the tunnel network. The geometry of the event clusters suggests occurrence on a planar geologic fault. The best-fitting plane has a strike of 164.7° north and dip angle of 55.0° toward the west. The study region has known faults striking in the north-northwest–south-southeast direction with a dip angle of 60°, but the relocated event clusters do not fall along any mapped fault. Based on the cluster geometry and the waveform similarity, we hypothesize that the microseismic events occur due to slips along an unmapped fault facilitated by the mining activity. The 3D velocity model we obtained from double-difference tomography indicates lateral velocity contrasts between depths of 0.4 and 0.5 km. We interpret the lateral velocity contrasts in terms of the altered rock types due to ore deposition. The known geotechnical zones in the mine indicate a good correlation with the inverted velocities. Thus, we conclude that passive seismic tomography using microseismic data could provide information beyond the excavation damaged zones and can act as an effective tool to complement geotechnical evaluations.

scholarly journals Investigation of PH effect in a mixture of basalt and iron on co2 sequestration in synthetic brines

2019 ◽  
Vol 7 (2) ◽  
pp. 112
Author(s):  
Toluwaleke Ajayi
Keyword(s):  
Carbon Sequestration ◽  
Host Rock ◽  
Co2 Sequestration ◽  
Ph Effect ◽  
Oil Field ◽  
Carbonate Mineral ◽  
Buffer Solution ◽  
Ph Response ◽  
Long Term Storage ◽  
Subsequent Step

CO2 sequestration in deep saline aquifers is a critical component of long-term storage options. It is suggested that the precipitation of mineral carbonates is mostly dependent on brine pH and is favoured above a basic pH of 9.0. However, brine pH will drop to acidic values once CO2 is injected into the brine. Therefore, there is a need to raise brine pH and maintain it stable. Synthetic brines were used here instead of natural brines because of the difficulty in obtaining and storing natural brines. Therefore, experiments were conducted to prepare a series of synthetic brines and to compare their suitability to natural brines for carbon sequestration. A typical formation rock (basalt) and a buffer solution (0.3M Tris buffer solution) were selected to buffer brine pH. The results show that synthetic brines prepared can be used as analogues to natural brines for carbon sequestration studies in terms of chemical composition and pH response. This study investigates the effect of iron ( ) in the pH of six synthetic brines prepared as analogue to oil-field brine by conducting a pH stability studies for CO2-brine experiment and CO2-basalt-brine experiment. In a subsequent step, studies were conducted to correlate how brine samples respond in the presence of basalt and the buffer solution. X-Ray powder Diffraction (XRD) analyses were also carried out to characterise the mineralogy of the synthetic brines. The result of the XRD confirmed that calcite was the major component that was dominated in the -brine–experiment while slight occurrence of calcite, iron oxyhydroxides and dolomite precipitated in the -rock-brine experiment. It was observed that ferric iron  and its reaction with host rock (basalt) did not contribute to pH instability therefore making it suitable for precipitation of carbonate mineral while ferrous iron in the absence of host rock did not contribute to pH instability therefore making it also suitable for precipitation of carbonate mineral.   

Optimization of Geophone Array for Monitoring Geologic Carbon Sequestration Using Double-Difference Tomography

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Ben Fahrman ◽  
Erik Westman ◽  
Mario Karfakis ◽  
Kray Luxbacher
Keyword(s):  
Carbon Sequestration ◽  
Injection Site ◽  
Seismic Event ◽  
Synthetic Data ◽  
Cost Effective ◽  
Velocity Model ◽  
Double Difference ◽  
Data Sets ◽  
Geologic Carbon Sequestration ◽  
Tomographic Inversion

Synthetic data were analyzed to determine the most cost-effective tomographic monitoring system for a geologic carbon sequestration injection site. Double-difference tomographic inversion was performed on 125 synthetic data sets: five stages of CO2 plume growth, five seismic event regions, and five geophone arrays. Each resulting velocity model was compared quantitatively to its respective synthetic velocity model to determine accuracy. The results were examined to determine a relationship between cost and accuracy in monitoring, verification, and accounting applications using double-difference-tomography. The geophone arrays with widely varying geophone locations, both laterally and vertically, performed best.

Development and Applications of Double-difference Seismic Tomography

2006 ◽  
Vol 163 (2-3) ◽  
pp. 373-403 ◽  
Author(s):  
Haijiang Zhang ◽  
Clifford Thurber
Keyword(s):  
Seismic Tomography ◽  
Double Difference

scholarly journals Reservoir monitoring by cross-hole electromagnetic and seismic tomography-Field experiments in the Lost Hills Oil Field,California-

2003 ◽  
Vol 68 (1) ◽  
pp. 83-90 ◽  
Author(s):  
Futoshi Tsuneyama ◽  
Shigeharu Mizohata ◽  
Kazumi Osato ◽  
Hidehiko Watanabe ◽  
Akira Saito ◽  
...  
Keyword(s):  
Seismic Tomography ◽  
Field Experiments ◽  
Oil Field ◽  
Reservoir Monitoring

scholarly journals Double-difference adjoint seismic tomography

2016 ◽  
Vol 206 (3) ◽  
pp. 1599-1618 ◽  
Author(s):  
Yanhua O. Yuan ◽  
Frederik J. Simons ◽  
Jeroen Tromp
Keyword(s):  
Seismic Tomography ◽  
Double Difference
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