An integrated methodology for sub-surface fracture characterization using microseismic data: A case study at the NW Geysers

Aminzadeh, Fred; Tafti, Tayeb A.; Maity, Debotyam

doi:10.1016/j.cageo.2012.10.015

Cited by 26 publications

(6 citation statements)

References 30 publications

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“…MS events that occur with shear deformation and at the tip of tensile fractures are not indicative for fracture apertures. MS properties form 3D information to reconstruct fracture network geometry (Aminzadeh et al., 2013), despite them providing limited insight in the hydraulic connectivity of the fracture network. Better capturing the hydraulic connectivity is necessary for the reduction of the uncertainty in fracture network characterization.…”

Section: Introductionmentioning

confidence: 99%

Fracture Network Characterization in Reservoirs by Joint Inversion of Microseismicity and Thermal Breakthrough Data: Method Development and Verification

Jiang,

Ringel,

Bayer

et al. 2023

Water Resources Research

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The spatial configuration of fractures often regulates flow and transport in the subsurface. However, the characterization of fracture networks is a challenging task, especially in deep reservoirs, because here only a limited number of boreholes is available to perform downhole logs and cross‐well hydraulic and tracer tests. In this study, we develop a joint inversion procedure to infer fracture number, geometry, and aperture based on Bayesian principles, utilizing microseismic (MS) events and thermal breakthrough data; both are typically available in enhanced geothermal systems and unconventional gas/oil reservoirs. A basic discrete fracture geometry, including orientations, lengths and positions of fractures, is generated from an MS events cloud by minimizing the distance between fractures and MS events. This geometric configuration, together with the aperture, is then further adjusted, based on the reversible jump Markov chain Monte Carlo algorithm, to minimize the misfit between observed and calculated thermal breakthrough curves by iterative forward flow and heat transport modeling. The inversion model is applied to two synthetic test cases. Following the sensitivity analysis of temperatures to fracture parameters, and the robustness analysis on the model performance under supportive data featuring good and poor quality, it is confirmed that the probabilistic joint inversion procedure approximates the fracture geometry and aperture well, and errors in predicting temperatures based on realizations of fracture networks are well below 5%. The methodology provides a new way to characterize fracture networks in the subsurface, without restrictions on predetermined fracture sizes or the number of fractures.

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Section: Introductionmentioning

confidence: 99%

Fracture Network Characterization in Reservoirs by Joint Inversion of Microseismicity and Thermal Breakthrough Data: Method Development and Verification

Jiang,

Ringel,

Bayer

et al. 2023

Water Resources Research

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“…Li et al (2021b) characterized the spatial shapes of fractures caused by hydraulic fracturing in coal mines. Aminzadeh et al (2013) determined the migration direction of the fracture network based on the seismic-source spatial location by using the fuzzy clustering method. Zhang et al (2019) speculated the fracture propagation path based on the order of occurrence and the spatial distance between the microseismic sources, but they did not consider the crack scale and the topological relationship between cracks, which reduces the reliability of path-prediction results.…”

Section: Introductionmentioning

confidence: 99%

Propagation path tracing of hydraulically created fractures based on microseismic monitoring

Liu

Hai-ting²,

Zhang³

et al. 2022

Front. Earth Sci.

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To evaluate the effect of hydraulic fracturing in a low-permeability reservoir, a propagation path tracing method for hydraulically created fractures was established based on microseismic monitoring data. First, the numerical simulation of the wave propagation process, grid search, and error-weight coefficient method was combined to locate the microseismic source. Then, the moment tensor inversion method was used to determine the tensile angle and source mechanism of hydraulically created fractures. Next, the tensile angle was used as the weight-index to determine the size of the mixed-source mechanism fracture combined with the shear and tensile source size quantization model. Finally, the spatial topological relationship between fractures was determined by comprehensively considering the spatial location and radius of the fractures, to realize the propagation path tracing of hydraulically created fractures. These tracking results can be used as one of the bases for the evaluation of the hydraulic fracturing effect.

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“…In recent years, many researchers have published research results in the field of microtremor about the use of a micro activity to obtain the values of frequency, wavelength, azimuth, noise, and complexity of ground movement in simple terms. [9] II. MATERIALS AND METHOD…”

Section: Introductionmentioning

confidence: 99%

Seismic Vulnerability Mapping to Support Spatial Plans in Lhokseumawe City Area

Siska¹,

Herman²,

Lisa³

et al. 2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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Earthquake loads that work on building structures can be determined by doing calculations ground motion on the surface. The amplitude from ground vibration is correlated with earthquake energy and ground solidity (compaction). The ductile ground will amplify the earthquake energy so that it produces strong vibration to the ground and building on the surface. This study will provide a mapping of areas susceptible to seismic vibrations to produce sustainable Lhokseumawe City spatial management plan policies as supporting literature in City development planning. The results of the study are expected to be disseminated to the community and as input for the Regional Government in planning the development of the city of Lhokseumawe. This research contributed to the development of cross-sectoral science in the assessment of the danger of micro seismic earthquakes. The results of the study were mapping areas that were susceptible to seismic vibration as a basis for spatial planning for the city of Lhokseumawe. The essential linkages in the field of science are on geophysics and architecture. The needs of the study carried out micro seismic data collection in the Lhokseumawe area using micro seismic equipment. The results of this study are the existence of areas that are very susceptible to seismic, namely Ujong Blang and Banda Sakti villages with seismic vulnerability index values (Kg) ranging from 0 cm / s2 -30542.32 cm / s2. The highest value is located at Ujong Blang Village start from point A10, which is 10397.1 cm / s2. This is finally related to the full damage to buildings in Lhokseumawe City during the 2004 earthquake.

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An integrated methodology for sub-surface fracture characterization using microseismic data: A case study at the NW Geysers

Cited by 26 publications

References 30 publications

Fracture Network Characterization in Reservoirs by Joint Inversion of Microseismicity and Thermal Breakthrough Data: Method Development and Verification

Fracture Network Characterization in Reservoirs by Joint Inversion of Microseismicity and Thermal Breakthrough Data: Method Development and Verification

Propagation path tracing of hydraulically created fractures based on microseismic monitoring

Seismic Vulnerability Mapping to Support Spatial Plans in Lhokseumawe City Area

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