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| 1 | 吉木萨尔凹陷页岩油密切割压裂多簇裂缝竞争扩展模拟显示文摘针对吉木萨尔凹陷芦草沟组页岩油储层地质特征,建立了重点改造井的密切割体积压裂裂缝扩展三维离散元数值模型,模型依据成像测井资料设置了随机分布的天然层理和高角度裂缝,依据纵向分层数据设置了小层及层间界面。模型模拟了不同分簇数和簇间距下的复杂裂缝扩展过程,分析了密切割体积压裂改造过程中多簇裂缝竞争扩展规律和改造后裂缝系统的立体产状。通过数值模拟分析可知:(1)页岩油储层密切割压裂过程中,多条水力裂缝竞争扩展程度随分簇数的增加及簇间距的减小而增强;(2)裂缝的竞争扩展是一个地应力、裂缝形态、裂缝宽度动态平衡的过程;(3)在相同泵排量和压裂时长条件下多簇裂缝系统的波及范围与储层改造面积(SRA)负相关;(4)高角度天然裂缝更易阻滞和捕获横切缝(垂直于水平井眼的人工主裂缝);(5)多簇裂缝系统的包络面呈'礼帽'形状,采用交错布置邻井压裂段位置有利于缩减井间未动用储层中油气的渗流距离。 | 侯冰 常智 武安安 Elsworth Derek | 2022 | 石油学报2022，43，1： | 16 |
| 2 | 泥页岩自然流体压力缝类型、特征及其作用——以中国东部古近系为例显示文摘以中国东部渤海湾盆地济阳坳陷东营凹陷、沾化凹陷和苏北盆地古近系富有机质泥页岩为例,对自然流体压力缝类型、特征及其对烃类初次运移的作用开展研究。结果表明,流体超压是自然流体压力缝产生的主要原因。自然流体压力缝有3种类型:早期泄水缝、顺层脉状裂缝和生排烃裂缝。早期泄水缝以其蛇曲形态为典型特征;顺层脉状裂缝中充填纤维状方解石脉,并与有机质共存;干酪根生烃增压形成的生排烃裂缝是富有机质泥页岩幕式排烃的关键。自然流体压力缝、层理缝和构造缝等多种成因的裂缝逐级汇聚形成相互连通的裂缝网络,是烃类重要的初次运移通道和储集空间,在多尺度渗流过程中充当渗流通道,且是实现泥页岩储集层体积压裂的前提。 | 马存飞 董春梅 栾国强 林承焰 刘小岑 ELSWORTH Derek | 2016 | 石油勘探与开发2016，43，4： | 14 |
| 3 | Rapid decompression and desorption induced energetic failure in coal显示文摘In this study, laboratory experiments are conducted to investigate the rapid decompression and desorption induced energetic failure in coal using a shock tube apparatus. Coal specimens are recovered from Colorado at a depth of 610 m. The coal specimens are saturated with the strong sorbing gas CO2 for a certain period and then the rupture disc is suddenly broken on top of the shock tube to generate a shock wave propagating upwards and a rarefaction wave propagating downwards through the specimen.This rapid decompression and desorption has the potential to cause energetic fragmentation in coal.Three types of behaviors in coal after rapid decompression are found, i.e. degassing without fragmentation, horizontal fragmentation, and vertical fragmentation. We speculate that the characteristics of fracture network(e.g. aperture, spacing, orientation and stiffness) and gas desorption play a role in this dynamic event as coal can be considered as a dual porosity, dual permeability, dual stiffness sorbing medium. This study has important implications in understanding energetic failure process in underground coal mines such as coal gas outbursts. | Shugang Wang Derek Elsworth Jishan Liu | 2015 | Journal of Rock Mechanics and Geotechnical Engineering2015，7，3： | 10 |
| 4 | 页岩支撑裂缝中渗透率变化规律实验研究显示文摘在页岩气藏的压裂开发中,支撑裂缝的渗透率是影响裂缝导流能力和压裂增产效果的重要因素。通过实验手段,研究了吸附气体的溶胀作用和支撑剂的嵌入作用对Greenriver页岩支撑裂缝渗透率的影响。采用Pulse test实验方法,测量并对比了非吸附气体和吸附气体的渗透率。以He为代表性的非吸附性气体,实验测得其在花岗岩和页岩中的渗透率曲线为线性,渗透率随着有效应力的减小而增加,且支撑剂的嵌入作用使页岩中的渗透率明显降低;以CO_2为代表性的吸附性气体,实验测得其在页岩中的渗透率曲线呈典型的'U'型,这是由于CO_2溶胀作用和有效应力共同作用的结果,从而说明在页岩支撑裂缝中,溶胀作用同样对渗透率有显著影响;与He在页岩中的渗透率相比,相同压力下的CO_2渗透率更低,且在Langmuir压力值附近达到最小值。 | 侯磊 Derek Elsworth 孙宝江 王金堂 | 2015 | 西南石油大学学报(自然科学版)2015，37，3： | 7 |
| 5 | Characterization of Hydraulic Fracture with Inflated Dislocation Moving Within a Semi-infinite Medium显示文摘Hydraulic fracturing is accompanied by a change in pore fluid pressure. As a result,this may be conveniently represented as inflated dislocation moving within a semi-infinite medium. Theory is developed to describe the pore pressures that build up around an inflated volumetric dislocation migrating within a saturated porous-elastic semi-infinite medium as analog to hydraulic fracturing emplacement. The solution is capable of evaluating the system behavior of both constant fluid pressure and zero flux surface conditions through application of a superposition. Characterization of horizontal moving dislocation processes is conducted as an application of these techniques. Where the mechanical and hydraulic parameters are defined,a priori,type curve matching of responses may be used to evaluate emplacement location uniquely. Pore pressure response elicited at a dilation,subject to pressure control is of interest in representing hydraulic fracturing where leak-off is an important component. The effect of hydraulic fracturing on fracture fluid pressure is evaluated in a poroelastic hydraulic fracture model utilizing dislocation theory. A minimum set of dimensionless parameters are defined that describe the system. Pore fluid pressures recorded during hydraulic fracturing of a well in the San Joaquin Valley of Central California is examined using the proposed model. The estimated geometry of the hydraulic fracture is matched with reasonable fidelity with the measured data. | OUYANG Zhi-hua ELSWORTH Derek LI Qiang | 2007 | Journal of China University of Mining and Technology2007，17，2： | 6 |
| 6 | Organic Geochemical and Petrographic Characteristics of the Coal Measure Source Rocks of Pinghu Formation in the Xihu Sag of the East China Sea Shelf Basin: Implications for Coal Measure Gas Potential显示文摘Coal measure source rocks, located in the Xihu Sag of the East China Sea Shelf Basin, were analyzed to define the hydrocarbon generation potential, organic geochemistry/petrology characteristics, and coal preservation conditions. The Pinghu source rocks in the Xihu Sag are mainly gas-prone accompany with condensate oil generation. The coals and shales of the Pinghu Formation are classified from 'fair' to 'excellent' source rocks with total organic carbon(TOC) contents ranging from 25.2% to 77.2% and 1.29% to 20.9%, respectively. The coals are richer in TOC and S1+S2 than the shales, indicating that the coals have more generation potential per unit mass. Moreover, the kerogen type of the organic matter consists of types Ⅱ-Ⅲ and Ⅲ, which the maturity Ro ranges from 0.59% to 0.83%. Petrographically, the coals and shales are dominated by vitrinite macerals(69.1%–96.8%) with minor proportions of liptinite(2.5%–17.55%) and inertinite(0.2%–6.2%). The correlation between maceral composition and S1+S2 indicates that the main contributor to the generation potential is vitrinite. Therefore, the coals and shales of the Pinghu Formation has good hydrocarbon generation potential, which provided a good foundation for coal measure gas accumulation. Furthermore, coal facies models indicates that the Pinghu coal was deposited in limno-telmatic environment under high water levels, with low tree density(mainly herbaceous) and with low-moderate nutrient supply. Fluctuating water levels and intermittent flooding during the deposition of peat resulted in the inter-layering of coal, shale and sandstone, which potentially providing favorable preservation conditions for coal measure gas. | WANG Yang QIN Yong YANG Liu LIU Shimin Derek ELSWORTH ZHANG Rui | 2020 | Acta Geologica Sinica(English Edition)2020，94，2： | 6 |
| 7 | Controlling effects of differential swelling index on evolution of coal permeability显示文摘Coal permeability measurements are normally conducted under the assumption that gas pressure in the matrix is equalized with that in fracture and that gas sorption-induced swelling/shrinking strain is uniformly distributed within the coal.However,the validity of this assumption has long been questioned and differential strain between the fracture strain and the bulk strain has long been considered as the primary reason for the inconsistency between experimental data and poroelasticity solutions.Although efforts have been made to incorporate the impact into coal permeability models,the fundamental nature of those efforts to split the matrix strain between fracture and coal bulk remains questionable.In this study,a new concept of differential swelling index(DSI)was derived to theoretically define the relation among sorption-induced strains of the coal bulk,fracture,and coal matrix at the equilibrium state.DSI was a function of the equilibrium pressure and its magnitudes were regulated by the Langmuir constants of both the matrix and the coal bulk.Furthermore,a spectrum of DSI-based coal permeability models was developed to explicitly consider the effect of differential strains.These models were verified with the experimental data under the conditions of uniaxial strain,constant confining pressure,and constant effective stress. | Chuanzhong Jiang Zhenfeng Zhao Xiwei Zhang Jishan Liu Derek Elsworth Guanglei Cui | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，3： | 5 |
| 8 | Dynamic analysis of heat extraction rate by supercritical carbon dioxide in fractured rock mass based on a thermal-hydraulic-mechanics coupled model显示文摘Heat production from geothermal reservoirs is a typical heat transfer process involving a cold working fluid contacting a hot rock formation.Compared to the thermal-physical characteristics of water,supercritical CO_(2)(scCO_(2))has a higher heat storage capacity over a wide temperature-pressure range and may be favored as a heat transfer fluid.Singularly characteristic of scCO_(2)-based heat extraction is that the hydraulic-thermal properties of the scCO_(2) vary dramatically and dynamically with the spatial pressure gradient during unsteady-state flow along fracture.This highly nonlinear behavior presents a challenge in the accurate estimation of heat extraction efficiency in scCO_(2)-based EGS.In this paper,a thermal-h ydraulic-mechanical(THM)coupled model is developed by considering deformation of the fractured reservoir,non-Darcy flow and the varying thermal-physical properties of scCO_(2).The proposed model is validated by matching the modeling temperature distribution with published data.The results show that during continuous injection of scCO_(2),the fracture first widens and then narrows,ultimately reopening over the long term.The sequential fracture deformation behaviors are in response to the combined impacts of mechanical compression and thermally-induced deformation.By controlling the injection parameters of the scCO_(2),it is found that the heat extraction rate is positively correlated to its pore pressure or mass flow rate.The heat extraction rate can be significantly enhanced,when the inlet temperature of scCO_(2) is below its critical temperature.As a result,the heat increment recovered per unit mass of scCO_(2) decreases as the hot rock is gradually cooled.Meanwhile,the heat increment recovered per unit mass of scCO_(2) decreases by increasing the inlet temperature of scCO_(2) or its mass flow rate,but increases as the outlet pressure rises.Furthermore,multi-linear regression indicates that controlling the inlet temperature of the scCO_(2) can significantly improve the thermodynamic efficiency of heat extraction. | Chunguang Wang Xingkai Shi Wei Zhang Derek Elsworth Guanglei Cui Shuqing Liu Hongxu Wang Weiqiang Song Songtao Hu Peng Zheng | 2022 | International Journal of Mining Science and Technology2022，32，2： | 3 |
| 9 | Perforation optimization of layer-penetration fracturing for commingling gas production in coal measure strata显示文摘Optimization of fracturing perforation is of great importance to the commingling gas production in coal measure strata.In this paper,a 3 D lattice algorithm hydraulic fracturing simulator was employed to study the effects of perforation position and length on hydraulic fracture propagation in coal measures of the Lin-Xing block,China.Based on field data,three lithologic combinations are simulated:1)a thick section of coal seam sandwiched by sandstones;2)a thin coal seam layer overlay by gas-bearing tight sandstone;3)two coal seams separated by a thin layer of sandstone.Our simulation shows that perforation position and length in multi-layer reservoirs play a major role in hydraulic fracture propagation.Achieving maximum stimulated volume requires consideration of lithologic sequence,coal seam thickness,stress states,and rock properties.To improve the combined gas production in coal measure strata,it is possible to simultaneously stimulate multiple coal seams or adjacent gas-bearing sandstones.In these cases,perforation location and length also significantly impact fracture propagation,and therefore should be carefully designed.Our simulation results using 3 D lattice algorithm are qualitatively consistent with laboratory physical simulation.3 D lattice models can be used to effectively simulate the fracture propagation through layers in coal measure strata.The numerical results provide guidance for perforation optimization in the hydraulic fracturing of coal measure strata. | Bing Hou Zhuang Cui Ji-Hui Ding Feng-Shou Zhang Li Zhuang Derek Elsworth | 2022 | Petroleum Science2022，19，4： | 2 |
| 10 | Frictional stability of Longmaxi shale gouges and its implication for deep seismic potential in the southeastern Sichuan Basin显示文摘Microearthquakes accompanying shale gas recovery highlight the importance of exploring the frictional and stability properties of shale gouges.Aiming to reveal the influencing factors on fault stability,this paper explores the impact of mineral compositions,effective stress and temperature on the frictional stability of Longmaxi shale gouges in deep reservoirs located in the Luzhou area,southeastern Sichuan Basin.Eleven shear experiments were conducted to define the frictional strength and stability of five shale gouges.The specific experimental conditions were as follows:temperatures:90–270°C;a confining stress:95 MPa;and pore fluid pressures:25–55 MPa.The results show that all five shale gouges generally display high frictional strength with friction coefficients ranging from 0.60 to 0.70 at the aforementioned experiment condition of pressures,and temperatures.Frictional stability is significantly affected by temperature and mineral compositions,but is insensitive to variation in pore fluid pressures.Fault instability is enhanced at higher temperatures(especially at>200°C)and with higher tectosilicate/carbonate contents.The results demonstrate that the combined effect of mineral composition and temperature is particularly important for induced seismicity during hydraulic fracturing in deep shale reservoirs. | Fengshou Zhang Li Cui Mengke An Derek Elsworth Changrong He | 2022 | Deep Underground Science and Engineering2022，1，1： | 2 |
| 11 | Evolution of coal permeability from stress-controlled to displacement-controlled swelling conditions显示文摘 | Jishan Liu Zhongwei Chen Derek Elsworth Xiexing Miao Xianbiao Mao | 2011 | Fuel2011，，10： | 2 |
| 12 | Influence of fracture roughness on shear strength,slip stability and permeability:A mechanistic analysis by three-dimensional digital rock modeling显示文摘Subsurface fluid injections can disturb the effective stress regime by elevating pore pressure and potentially reactivate faults and fractures.Laboratory studies indicate that fracture rheology and permeability in such reactivation events are linked to the roughness of the fracture surfaces.In this study,we construct numerical models using discrete element method(DEM)to explore the influence of fracture surface roughness on the shear strength,slip stability,and permeability evolution during such slip events.For each simulation,a pair of analog rock coupons(three-dimensional bonded quartz particle analogs)representing a mated fracture is sheared under a velocity-stepping scheme.The roughness of the fracture is defined in terms of asperity height and asperity wavelength.Results show that(1)Samples with larger asperity heights(rougher),when sheared,exhibit a higher peak strength which quickly devolves to a residual strength after reaching a threshold shear displacement;(2)These rougher samples also exhibit greater slip stability due to a high degree of asperity wear and resultant production of wear products;(3)Long-term suppression of permeability is observed with rougher fractures,possibly due to the removal of asperities and redistribution of wear products,which locally reduces porosity in the dilating fracture;and(4)Increasing shear-parallel asperity wavelength reduces magnitudes of stress drops after peak strength and enhances fracture permeability,while increasing shear-perpendicular asperity wavelength results in sequential stress drops and a delay in permeability enhancement.This study provides insights into understanding of the mechanisms of frictional and rheological evolution of rough fractures anticipated during reactivation events. | Chaoyi Wang Derek Elsworth Yi Fang Fengshou Zhang | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，4： | 2 |
| 13 | Peripheral nervedopamine neuron co- grafts in MPTP- treated mondeys: augmentation of tyrosine hydroxylase- positive fiber staining and dopamine content in host systems显示文摘 | Collier TJ Elsworth JD Taylor JR | 1994 | Neuroecience1994，61，4： | 1 |
| 14 | The grounded psychometric development and initial validation of the Health Literacy Questionnaire (HLQ)显示文摘 | Osborne RH Batterham RW Elsworth GR | 2013 | BMC Public Health2013，13，： | 1 |
| 15 | A phenomenological failure criterion for brittle rock显示文摘 | OUYANG Z ELSWORTH D | 1991 | Rock Mechanics and Rock Engineering1991，，24： | 1 |
| 16 | Thermal-hydrologic-mechanical-chemical processes in the evolution of engineered geothermal reservoirs显示文摘 | Taron J Elsworth D | | 0，，05： | 1 |
| 17 | Linking gas-sorption induced changes in coal permeability to directional strains through a modulus reduction ratio显示文摘 | LIU J CHEN Z ELSWORTH D | 2010 | International Journal of Coal Geology2010，83，： | 1 |
| 18 | Modeling of subsidence and stress-dependent hydraulic conductivity for intact and fractured porous media显示文摘 | Dr. M. Bai D. Elsworth | 1994 | Rock Mechanics and Rock Engineering1994，，4： | 1 |
| 19 | Age-specific Norms and Determinants of Anxiety and Depression in 731 Women with Breast Cancer Recruited through a Population-based Cancer Registry显示文摘 | Osborne R H Elsworth G R Hopper J L | 2003 | Eur J Cancer2003，39，6： | 1 |
| 20 | Numerical simulation ofthermal-hydrologic- mechanical-chemical processes indeformable, fractured porous media显示文摘 | Taron J Elsworth D Min K B | 2009 | InternationalJournal of Rock Mechanics & Mining Sciences2009，46，5： | 1 |
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