In-situ stress state in the Linxing region, eastern Ordos Basin, China: Implications for unconventional gas exploration and production

Ju, Wei; Shen, Jian; Qin, Yong; Meng, Shangzhi; Wu, Caifang; Shen, Yue; Yang, Zhaobiao; Li, Guozhang; Li, Chao

doi:10.1016/j.marpetgeo.2017.05.026

Cited by 99 publications

(56 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In-situ stress refers to the present-day natural stress related to the tectonic and gravitational stress. 14,43,58,59 In a vertical well, the orientation of the minimum (Sh min ) and maximum (SH max ) horizontal stress can be determined from borehole breakouts and drilling-induced fractures assuming one of the principal stresses to be vertical ( Figure 5), 16,43,47,[59][60][61][62][63][64][65] Borehole breakouts (wellbore enlargements) are easily to be picked out and are recognized as broad and dark bands and are suggested to be parallel to the orientations of Sh min ( Figure 5). The orientation (rose diagram) of the breakouts in Figure 6 is determined approximately a north-south trend (170°-180°), and this suggests a SH max orientation of about 80°-90° ( Figure 6).…”

Section: In-situ Stress Analysismentioning

confidence: 99%

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Niu

Liu

Lai

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

Fracture detection and in‐situ stress determination via well logs are important for exploration and exploitation of subsurface hydrocarbons. Cores, thin sections, and image logs are used to describe and interpret the subsurface fractures and in‐situ stress in the Paleogene Dongying sandstones in Nanpu Sag, Bohai Bay Basin, China. The maximum horizontal stress (SHmax) indicates a nearly east‐west trend according to the borehole breakouts and drilling‐induced fractures. Natural fractures in the Dongying sandstones are classified into: (1) open fractures and (2) closed fractures. The cement‐filled (closed) fractures are commonly detected by image logs as bright discontinuous sinusoidal waves due to resistive filling materials, while the open fractures are evident on image logs appearing as dark sine waves. The open fractures are of dominantly high dip angles, and the rose diagrams confirm the presences of two sets of fractures: northwest‐southeast and northwest‐southeast orientation. Fractures with strikes approximately parallel to the SHmax have good connectedness, making a significant contribution in hydrocarbon production. In addition, the oil‐bearing layers are mainly associated with the intervals with open fractures. The presence of natural fractures provides important pore spaces and fluid flow conduits. Insights can be provided into the subsurface fracture (natural and induced) detection and characterization using image logs.

show abstract

Section: In-situ Stress Analysismentioning

confidence: 99%

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Niu

Liu

Lai

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…The marginal areas of the North China Craton sedimentary basins are at the intersection part of different blocks, and these areas tend to have multi‐periods of structural changes in the evolution of the Mesozoic and Cenozoic tectonic stress fields (J. S. Liu et al, ; Yin & Ding, ; C. Wang, Liu, Feng, Wei, & Wang, ). The variation and superposition of the stress fields in different tectonic periods affect the formation of fractures, and the complexity restricts the characterization and prediction of fractures from the mechanical mechanism (Ju et al, ; Laubach, ; Y. M. Pang et al, ; Yin, Lv, & Ding, ).…”

Section: Introductionmentioning

confidence: 99%

“…Wang, Liu, Feng, Wei, & Wang, 2018). The variation and superposition of the stress fields in different tectonic periods affect the formation of fractures, and the complexity restricts the characterization and prediction of fractures from the mechanical mechanism (Ju et al, 2017;Laubach, 1989; Y. M. Pang et al, 2019;Yin, Lv, & Ding, 2018).…”

Section: Introductionmentioning

confidence: 99%

Developmental characteristics and distribution law of fractures in a tight sandstone reservoir in a low‐amplitude tectonic zone, eastern Ordos Basin, China

Yin

Tian²,

2019

Geological Journal

View full text Add to dashboard Cite

In recent years, a large number of vertical and horizontal sliding fractures were found in the Upper Palaeozoic sandstones in the eastern margin of the Ordos Basin, China, However, the effect of fractures on the distribution of tight sandstone gas is still unclear. Therefore, in this paper, a large number of cores, thin sections, petrophysical property test results, conventional and FMI (Formation MicroScanner Image) image logs, and gas‐testing results were used to study the developmental characteristics of fractures and the gas control effects in a tight sandstone reservoir, in the eastern margin of the Ordos Basin. It was found that the average linear density of the core fractures is generally less than 2 m−1, and the microfractures are characterized as ruptures of quartz particles. The underlying Taiyuan and Benxi formations have the highest fracture development degrees, and the fracture index (FI) values are 0.68 and 0.72, respectively. However, the fracture development degrees in the overlying Shanxi to Shiqianfeng formations are significantly lower, and the FI values are generally less than 0.63. There is a good positive correlation between the fracture development degree and the contents of quartz mineral or brittle minerals (quartz + feldspar). On the whole, the fractures in the uplift and slope parts of the low‐amplitude structure areas are more developed, while in the depression zones, the fractures are generally less developed. The fractures in the Zijinshan Uplift area are extremely well developed; thus, the preservation conditions of the reservoir are poor. In this case, the fractures are unfavourable for the accumulation of natural gas. For the gentle tectonic zones, the over‐developed fractures in the Benxi and Taiyuan formations are unfavourable for the preservation of natural gas. However, the moderately developed fractures in the overlying Shanxi to Shiqianfeng formations are beneficial to the enrichment of natural gas. Finally, we compared the relationship between fracture index (FI) and open‐flow productivity of the gas wells, and it was found that FI values of commercial gas wells (Types I, II, and III gas wells) are generally greater than 0.55, while the FI values of Type IV low‐yield gas wells are generally less than 0.55.

show abstract

“…[5][6][7][8][9][10] Moreover, vertical variations of the current in situ stress regime have obvious influence on CBM enrichment mechanisms and development conditions. 8,11,[15][16][17] K is one of the most important factors in the determination of CBM productivity. 8,11,[15][16][17] K is one of the most important factors in the determination of CBM productivity.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14] By controlling the opening or closing of the coal reservoir pore-fracture system, the current in situ stress regime has obvious control effects on K, P o , G, artificial fracture expansion, and the process of drainage and pressure lowering. 8,11,[15][16][17] K is one of the most important factors in the determination of CBM productivity. 8 The K values of coal reservoirs are mainly composed of 0.01-5 mD in China, which is lowered by 1-2 magnitudes than overseas, for example, the Powder River Basin in North America (>10 mD) and the Surat Basin in Austria (10-30 mD).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of in situ stress and its influence on coalbed methane development: A case study in the eastern part of the southern Junggar Basin, NW China

Yan

Yang

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

Based on 54 sets of well test data of 29 coalbed methane (CBM) wells, the distribution characteristic of in situ stress in the eastern part of the southern Junggar Basin and its control on permeability (K), reservoir pressure (P o ), and gas content (G) were discussed systematically. The results show that three types of in situ stress regime exist and are converted corresponding to a certain depth, (1) <600 m is the strike-slip fault regime (σ H

show abstract

In-situ stress state in the Linxing region, eastern Ordos Basin, China: Implications for unconventional gas exploration and production

Cited by 99 publications

References 35 publications

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Developmental characteristics and distribution law of fractures in a tight sandstone reservoir in a low‐amplitude tectonic zone, eastern Ordos Basin, China

Characteristics of in situ stress and its influence on coalbed methane development: A case study in the eastern part of the southern Junggar Basin, NW China

Contact Info

Product

Resources

About