Laboratory investigation of the relationship between static rock elastic parameters and low field nuclear magnetic resonance data

Ge, Xin; Xiao, Yufeng; Fan, Yiren; Liu, Jianyu; Zhang, Yonghao

doi:10.1016/j.ijrmms.2019.104207

Cited by 13 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to previous studies, the micro-structure of granite has a significant influence on its mechanical properties [62]. By means of a nuclear magnetic resonance test, the relationship between the porosity and the mechanical parameters of the granite was studied [63].…”

Section: Correlation Analysis Between Porosity and Mechanical Paramet...mentioning

confidence: 99%

Permeability and Mechanical Response of Granite after Thermal and CO2 Bearing Fluid Hydro-Chemical Stimulation

et al. 2022

View full text Add to dashboard Cite

The large scale extraction of geothermal energy can reduce CO2 emissions. For hot dry rocks, the key to successful utilization depends on the efficiency of reservoir reconstruction. The chemical and thermal stimulation methods are always used in geothermal reservoir reconstruction except in hydraulic fracturing with high fluid injection pressure, which is believed to reduce the seismic hazard by applying before the high-pressure hydraulic fracturing stimulation. However, at the laboratory scale, there are still very limited experimental studies illustrating the combined effects of chemical and thermal stimulation on the permeability and mechanical properties of granite, which is regarded as the main type of hot dry rock. In this paper, comparative stimulation experiments were carried out, including thermal/cold stimulation, CO2 bearing solution hydro-chemical stimulation, combined thermal and CO2 bearing fluid stimulation. By means of nuclear magnetic resonance analysis, permeability test and triaxial compression test, the changes of the micro-structure, permeability and mechanical properties of granite under various stimulation conditions were analyzed. The experimental results show that, compared with the single thermal stimulation and CO2 bearing fluid hydro-chemical stimulation, the superposition effect of thermal and CO2 bearing fluid hydro-chemical stimulation can increase the number of micro-fractures in granite more effectively, thus increasing the permeability, while the elastic modulus and compressive strength decrease. Moreover, the cooling mode on the granite also has a certain influence on the stimulation effect. After water-cooling on the heated granite (300 °C), combined with the CO2 bearing fluid stimulation (240 °C, 20 MPa), the permeability of granite is the highest, increasing by 17 times that of the initial state, and the porosity also increases by 144.4%, while the elastic modulus and compressive strength decrease by 14.3% and 18.4%, respectively. This implies that the deterioration of mechanical properties due to the micro-fractures increased by the thermal and chemical stimulation can enhance the fluid conductivity and heat extraction of granite. The methods in this paper can provide a reference for the combined application of thermal and chemical stimulation technology in artificial reservoir reconstruction of hot dry rocks.

show abstract

Section: Correlation Analysis Between Porosity and Mechanical Paramet...mentioning

confidence: 99%

Permeability and Mechanical Response of Granite after Thermal and CO2 Bearing Fluid Hydro-Chemical Stimulation

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The characteristics of the fractures in the CT scanning image are high grayscale, strong continuity, and a long and narrow line or dendritic distribution. Therefore, the 3D shape factor F can be used to describe the target morphology [15,16].…”

Section: Geofluidsmentioning

confidence: 99%

“…For the stressstrain method, the stress-strain curve of the rock which reflects the whole process of rock deformation, cracking, and ultimate loss of bearing capacity under external load is the most intuitive and effective method for qualitative evaluation of rock brittleness [8][9][10]. Jin et al (2014), Bishop (1967), Tarasov and Potvin (2013), Munoz et al (2016), and Ge et al (2020) constructed the evaluation models of reservoir brittleness index based on their understandings of the stress-strain curve [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Study on a New Rock Fracability Evaluation Model of Shale Gas Reservoir

Wang

Zhang

et al. 2020

Geofluids

Self Cite

View full text Add to dashboard Cite

Shale gas is an important unconventional energy resource that needs large-scale fracturing to form industrial deliverability. The evaluation of reservoir fracability plays a key role in the optimization of the sweet spot, the design of multistage fracturing, and the prediction of economic benefit. Based on volumetric fracturing, the study proceeded from the fracture complexity of the fractured core, and the bursting pressure experiment technology using the constant strain rate method was established. After the core has fractured, the fracture morphology was extracted and the fracture parameters including fracture area ratio and fracture declination dispersion were calculated to construct the fracture complexity of the pressed core. Combined with the core strength, the fracability index of the core was determined to evaluate the reservoir fracability. This method can represent not only the fracturing effect but also the fracturing difficulty. Compared with the monitoring data of hydrofracture-induced microseism of the sample well, the core fracturing index was found to be in good agreement with the actual fracturing effect. This method is more reasonable than the traditional brittleness index method and rock mechanics parameter method.

show abstract

Damage mechanism of sandstones subject to cyclic freeze–thaw (FT) actions based on high-resolution computed tomography (CT)

Zhang

et al. 2022

Bull Eng Geol Environ

View full text Add to dashboard Cite

Laboratory investigation of the relationship between static rock elastic parameters and low field nuclear magnetic resonance data

Cited by 13 publications

References 16 publications

Permeability and Mechanical Response of Granite after Thermal and CO2 Bearing Fluid Hydro-Chemical Stimulation

Permeability and Mechanical Response of Granite after Thermal and CO2 Bearing Fluid Hydro-Chemical Stimulation

Study on a New Rock Fracability Evaluation Model of Shale Gas Reservoir

Damage mechanism of sandstones subject to cyclic freeze–thaw (FT) actions based on high-resolution computed tomography (CT)

Contact Info

Product

Resources

About