In-Situ Stress Test Data - Revelation to Optimisation of Stimulation Strategy of an Unconventional Reservoir

2013 ◽  
Author(s):  
Mohit Mathur ◽  
Aditya Ojha ◽  
Sourabh Shukla ◽  
Anish Gupta ◽  
Manabesh Chowdhury
Keyword(s):  
Test Data ◽  
Stress Test ◽  
In Situ Stress ◽  
Unconventional Reservoir

Effects of topography and lithology variation on in situ stress at shallow depths in South Korea: results from statistical characterization of stress data

2020 ◽  
Author(s):  
Minzy Kang ◽  
Chandong Chang
Keyword(s):  
South Korea ◽  
Hydraulic Fracturing ◽  
Test Data ◽  
Measurement Data ◽  
In Situ Stress ◽  
Statistical Characterization ◽  
Stress Rotation ◽  
Ranking Scheme ◽  
Stress Uniformity

<p>In situ stress state at shallow depths (<1 km) is important for designing underground systems for various projects such as nuclear waste disposal, carbon dioxide geological sequestration, and geo-resource development. Stress characterization for such projects rely largely on stress measurement data (such as hydraulic fracturing test data). We compile a large number of hydraulic fracturing test data measured in a total of 226 boreholes in South Korea, and attempt to characterize shallow crustal stress over the country. These data are measurements at depths down to 850 m, and classified mostly low-quality based on World Stress Map quality ranking scheme (B-quality: 7%, C: 42%, and D: 51%). We grid the country by 0.25°×0.25°, and find a circular bin size at each grid point using two statistical methods (weighted standard deviation and quasi interquartile range), by which the uniformity of stress orientation can be estimated. As many data are low-quality, we apply this process to two subsets of data (B-C and B-D) to find an optimal stress characterization. Our most optimal characterization results show that bin diameter in most of the country vary between 100 and 200 km, except for southeastern Korea. Bin diameters in southeastern Korea range between 0 and 60 km, which means that stress heterogeneity is especially significant in the region, where lithology varies markedly and several active faults are clustered. The stress orientations in the northeastern part of the country are characterized as intermediate stress uniformity (bin size of ~120 km in diameter) but a systematic horizontal stress rotation (up to ~60°) from that of the deep-seated regional stress. This region is mountainous with altitude as high as 1.4 km. To verify whether the stress rotation is a result of topographic effect, we model stress perturbation using the digital elevation model (DEM) data of the region, which yields stress rotation comparable to measurements. We find that lithology is a particularly important factor that affects stress magnitudes over the country, as the stress magnitudes at the same depth tend to be markedly smaller in sedimentary rocks than in crystalline rocks. Our study, although given data are of fairly low-quality, can provide a basis for shallow stress map of South Korea.</p>

scholarly journals Impact of elliptical boreholes on in situ stress estimation from leak-off test data

2018 ◽  
Vol 15 (4) ◽  
pp. 794-800 ◽  
Author(s):  
Hong Xue Han ◽  
Shunde Yin ◽  
Bernt Sigve Aadnoy
Keyword(s):  
Test Data ◽  
In Situ Stress ◽  
Stress Estimation

New constraints on stress and fracture orientations in the Shipwreck Trough, Otway Basin: implications for conventional and unconventional exploration and production

2012 ◽  
Vol 52 (2) ◽  
pp. 697
Author(s):  
David Tassone ◽  
Simon Holford ◽  
Rosalind King ◽  
Guillaume Backé
Keyword(s):  
Stress Tensor ◽  
Test Data ◽  
Sedimentary Basins ◽  
Horizontal Stress ◽  
In Situ Stress ◽  
New Method ◽  
Natural Fracture ◽  
Log Data ◽  
Maximum Horizontal Stress

A detailed understanding of the in-situ stress tensor within energy-rich basins is integral for planning successful drilling completions, evaluating the reactivation potential of sealing faults and developing unconventional plays where fracture stimulation strategies are required to enhance low permeability reservoirs. Newly available leak-off test results interpreted using a new method for analysing leak-off test data constrains the minimal horizontal stress magnitude for the offshore Shipwreck Trough wells to be ∼20 MPa/km, which is similar to the vertical stress magnitude derived from wireline data for depths shallower than ∼2–2.5 km. Breakouts interpreted from image log data reveal a ∼northwest–southeast maximum horizontal stress orientation and formation pressure tests confirm near-hydrostatic conditions for all wells. The new method for analysing leak-off test data has constrained the upper limit of the maximum horizontal stress magnitude to be the greatest, indicating a reverse-to-strike-slip faulting regime, which is consistent with neotectonic faulting evidence. Petrophysical wireline data and image log data to characterise extant natural fracture populations within conventional reservoirs and stratigraphic units that may be exploited as future unconventional reservoirs have also been used. These fracture sets are compared with possible fracture populations recognised in contiguous, high-fidelity 3D seismic datasets using a new method for identifying fracture systems based on attribute mapping techniques. This study represents the first of its kind in the Otway Basin. Combined analysis of the in-situ stress tensor and fracture density and geometries provides a powerful workflow for constraining fracture-related fluid flow pathways in sedimentary basins.

In-situ stress test and rockburst analysis in Micang Mountain tunnel

2019 ◽  
pp. 1-10
Author(s):  
Yushun Yang ◽  
Dongming Zhang ◽  
Shujian Li ◽  
Longqiang Yang ◽  
Lei Jin
Keyword(s):  
Stress Test ◽  
In Situ Stress ◽  
Mountain Tunnel

scholarly journals Verification for Fault Stability by In-Situ Stress Test

2012 ◽  
Vol 5 ◽  
pp. 130-134
Author(s):  
GUO Xifeng ◽  
YIN Jianmin ◽  
LI Yongsong ◽  
AI Kai
Keyword(s):  
Stress Test ◽  
In Situ Stress ◽  
Fault Stability
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