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Role of bedding planes played in enhancing dissolution in sandstones

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Frontiers of Earth Science 2022年第3期16卷 587-600页

作者： Jin LAI Xiaojiao PANG Meng BAO Bing WANG Jianan YIN Guiwen WANG Xuechun FAN State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China

Diagenesis exerts an important control on porosity evolution,and research of diagenesis and diagenetic minerals provides insights into reservoir quality evaluation and CO_(2) *** section,XRD(X-ray diffraction),CT(Computed Tomography),scanning electron microscopy(SEM),and NMR(Nuclear Magnetic Resonance)tests were used to investigate composition,texture,pore spaces,and diagenesis of sandstones in Paleogene Dongying Formation in Bohai Bay Basin,China,with special aims to unravel diagentic dissolution along bedding *** oversized pores,remnants in feldspar-hosted pores,and kaolinite within feldspar grains indicate a high degree of dissolution the framework grains experienced during *** CO_(2)-rich or organic acids are responsible for the feldspar *** size plays the primary role in enhancing bedding dissolution process,and bedding planes in fine-medium grained sandstones with high content of feldspars are frequently enlarged by *** CT scanning image confirms dissolution pores are distributed discontinuously along the bedding *** dissolution pores along bedding planes have large pore size,and correspond to the right peak of the bi-modal T_(2)(transverse relaxation time)*** laminated sandstones and siltstones,or sandstones with cross beddings help improve framework grain *** new findings help improve the understanding of diagenetic models,and have implications in reservoir quality prediction and resource assessments in sandstones.

关键词： dissolution sandstones diagenesis bedding plane Dongying Formation

Evolution of anisotropy during sandstone rockburst process under double-faces unloading

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Journal of Central South University 2021年第8期28卷 2472-2484页

作者： LIU Dong-qiao LING Kai LI Dong HE Man-chao LI Jie-yu HAN Zi-jie ZHANG Shu-dong State Key Laboratory for GeoMechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing 100083China

Rockburst is one of the major disasters in deep underground rock mechanics and *** precursors of rockbursts play important roles in rockburst *** experiments were performed under double-face unloading on sandstone with horizontal bedding planes using an independently designed rockburst testing facility.P-wave propagation time during the tests was automatically recorded by the acoustic emission *** P-wave velocities were calculated in both two directions to analyze their *** find a characteristic precursor for rockburst,the dynamic evolution of rock anisotropy during the rockburst test is quantified by the anisotropic coefficient k,defined as the ratio of the two P-wave velocities in the directions vertical to and parallel to the bedding *** results show that rockburst occurs on the two free surfaces *** rockburst failure occurs in the following order:crack generation,rock peeling,particle ejection,and rock *** the process of rockburst under double-face unloading,the potential evolution characteristics of anisotropy can be generalized as *** suddenly unloading induces damage in the rock and presents anisotropic coefficient k steeply increasing departing from one,i.e.,*** rocks with horizontal bedding planes will reach the isotropic state before rockburst,which could be considered as a characteristic precursor of this kind of rockburst.

关键词： strainburst bedding plane P-wave velocity anisotropy rockburst prediction

Constrained fitting of faulted bedding planes for three-dimensional Geological modeling

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Constrained fitting of faulted bedding planes for three-dime...

Investigation of meso-failure behaviors of Jinping marble using SEM with bending loading system

中国科学院地质与地球物理研究所2002学术年会

作者： Da’ an Liu Juming Zhang Sijing Wang Key Laboratory of Engineering Geomechanics,Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029,People’ s Republic of China

Structural surfaces such as bedding planes and faults are the most important information for studying a geological *** engineering investigation,this information mainly comes from a limited number of discrete data by field artificial investigation and borehole *** effective utilization of the limited exploration data and more accurate reconstruction of complex geological body, a three-dimensional(3D) fitting function method that can satisfy positional and directional constraints is presented in this paper.A unified fitting function is established for fitting a group of faulted bedding planes with the consideration of local discontinuities due to ***,the effectiveness of this method is demonstrated through a 3D virtual geological modeling on the background of a hydroelectric project of western China in planning.©2002 Published by Elsevier Science Ltd.

关键词： Three dimensional geological modeling Fitting function Fault Strata bedding plane

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Journal of Rock Mechanics and Geotechnical Engineering 2015年第5期7卷 593-599页

作者： Jianping Zuo Xu Wei Jianliang Pei Xiaoping Zhao School of Mechanics and Architectural Engineering China University of Mining and Technology State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology College of Water Resources and Hydropower Sichuan University

In th is study, th e m eso-failure m ech an ism an d fracture surface o f Jinping m arble w ere investigated bym ean s o f scanning electro n m icroscope （SEM） w ith ben d in g loading system and laser-scanner equipment. The Y antang an d B aishan m arbles specim ens from Jinping II hyd ro p o w er sta tio n w ere used. Testresu lts show th a t th e fracture to u g h n ess and m echanical behaviors o f Y antang m arble w ere basicallyh ig h er th a n th o se o f Baishan m arble. This is m ainly d u e to th e fact th a t Baishan m arble co n tain s a largep ercen tag e o f d o lom ite an d m in o r mica. Crack pro p ag atio n p a th and fracture m orphology in d icated th a tth e d irection o f ten sile stress has a significant effect on th e m echanical behaviors an d fracture toughnesso f B aishan m arble. For Yantang an d B aishan m arbles, a large n u m b e r o f m icrocracks a ro u n d th e m aincrack tip w ere observed w h e n th e directio n o f ten sile stress w as parallel to th e bed d in g plane.C onversely, few m icrocracks o ccurred w h e n th e directio n o f ten sile stress w as p erp en d icu lar to th ebed d in g plane. The presen ce o f a large n u m b e r o f m icrocracks a t th e m ain crack tip d ecreased th e globalfracture to u g h n ess o f m arble. The results o f th re e -p o in t ben d in g te sts show ed th a t th e average bearingcapacity o f intact m arble is 3.4 tim es th e notch ed m arble, b u t th e ductility p ro p e rty o f th e defectivem arble afte r p eak load is b e tte r th a n th a t o f th e intact m arble. H ence, large d efo rm atio n m ay beg en erated before failure o f in tact m arbles a t Jinping II h y d ro p o w er station. The fractal d im en sio n o ffracture surface w as also calculated by th e cube covering m eth o d . O bservational resu lt show ed th a t th elargest fractal dim en sio n o f Y antang m arble is cap tu red w h e n th e directio n o f ten sile stress is parallel toth e bedding plane. H ow ever, th

关键词： Jinping marble bedding plane Meso-failure mechanism Scanning electron microscope (SEM) In-situ observation

The influence of water-based drilling fluid on mechanical property of shale and the wellbore stability

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Petroleum 2016年第1期2卷 61-66页

作者： Shu He Lixi Liang Yinjin Zeng Yi Ding Yongxue Lin Xiangjun Liu Sinopec Research Institute of Petroleum Engineering Beijing 100101China State Key Lab of Oil&Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan 610500China

Because of high cost and pollution of oil-based drilling fluid,the water-based drilling fluid is increasingly used ***,bedding planes and micro-cracks are rich in shale *** water-based drilling fluid contacts formation rock,it causes the propagation of crack and invasion of drilling fluid,which decrease shale strength and cause wellbore *** this paper,we analyzed influence of water-based drilling fluid on shale strength and failure mode by mechanics *** on those experimental results,considering the effect of bedding plane and drilling time,we established modeling of wellbore stability for shale *** result from this model indicates that in certain azimuth of horizontal well,collapsing pressure increases dramatically due to shale failure along with bedding *** drilling operation,those azimuths are supposed to be *** model is applicable for predication of collapsing pressure in shale formation and offers reference for choosing suitable mud weight.

关键词： Water-based drilling fluid Shale bedding plane Wellbore stability