Experimental investigation of deformation mechanisms ...

2019-2-19 · Experimental investigation of deformation mechanisms during shear-enhanced compaction in poorly lithified sandstone and sand Elin Skurtveit,1,2,3 Anita Torabi,1 Roy H. Gabrielsen,4 and Mark D. Zoback5 Received 8 May 2013; revised 6 August 2013; accepted 8 August 2013.

Microscale Pore Throat Differentiation and Its Influence ...

2021-1-7 · Research Article Microscale Pore Throat Differentiation and Its Influence on the Distribution of Movable Fluid in Tight Sandstone Reservoirs Fengjuan Dong,1,2 Xuefei Lu,3 Yuan Cao,4 Xinjiu Rao,5 and Zeyong Sun1,2 1College of Petroleum Engineering, Xi ''an Shiyou University, Xian, Shaanxi 710065, China 2Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi ...

Mechanisms of enhancer action: the known and the …

2021-4-15 · Differential gene expression mechanisms ensure cellular differentiation and plasticity to shape ontogenetic and phylogenetic diversity of cell types. A key regulator of differential gene expression programs are the enhancers, the gene-distal cis-regulatory sequences that govern spatiotemporal and quantitative expression dynamics of target genes. Enhancers are widely believed to physically ...

Sandstone? Shale? Formation Evaluations: Well logs

2016-2-15 · • Found to be Related to Presence of Sandstone • Lithology tool Surface Down hole The well works like a battery E = -K log (aw/amf) E is in millivolts aw= water salinity amf= mud salinity Ion flow is easier in permeable sandstones

VASCULAR TISSUE DIFFERENTIATION AND PATTERN …

2019-5-8 · Abstract Vascular tissues, xylem and phloem, are differentiated from meristematic cells, procambium, and vascular cambium. Auxin and cytokinin have been considered essential for vascular tissue differentiation; this is supported by recent molecular and genetic analyses. Xylogenesis has long been used as a model for study of cell differentiation, and many genes involved in late stages of ...

Tracheary Element Differentiation | Annual Review of Plant ...

2019-7-17 · AbstractTracheary elements (TEs) are cells in the xylem that are highly specialized for transporting water and solutes up the plant. TEs undergo a very well-defined process of differentiation that involves specification, enlargement, patterned cell wall deposition, programmed cell death and cell wall removal. This process is coordinated such that adjacent TEs are joined together to form a ...

(PDF) Tight sandstone gas accumulation mechanism and ...

2015-10-19 · Tight sandstone gas accumulation mechanism and development models. October 2015; Petroleum Science ... Water and gas reversal patterns have been detected via glass tube and quartz sand …

Horizontal-Wellbore Stability and Sand Production in ...

2000-12-1 · A new conceptual model for an initial sand production prediction is presented in another paper. 10 However, in many situations a certain degree of sand failure around the wellbore, and resulting sand production, is acceptable within limits. In this paper we present laboratory experiments focusing on re-stabilization after initial sand failure ...

(PDF) Mechanisms and controls on the formation of sand ...

Ke ywords: soft sediment deformation mechanism, sandstone dykes, sandstone sills, sand volcanoes. Although sandstone intrusions within sedimentar y successions ha ve long …

Study on microstructure mechanism of sandstone based on ...

Study on microstructure mechanism of sandstone based on complex network theory. Abstract. Rock contains a large number of micro-pores, which are of different shapes and complex structures. The structure information of sandstones is extracted based on different porosities through X-ray CT (Computer Tomography) scanning, photo processing ...

Occurrence, Classification and Formation Mechanisms of the ...

The detailed characteristics and formation mechanisms of organic-rich clasts (ORCs) in the Upper Paleozoic tight sandstone in the northeastern margin of the Ordos Basin were analyzed through 818-m-long drilling cores and logging data from 28 wells. In general, compared with soft-sediment clasts documented in other sedimentary environments, organic-rich clasts in coal-bearing tight sandstone ...

(PDF) Relief-induced soil differentiation at the sandstone ...

Relief-induced soil differentiation at the sandstone-mudstone contact in the Stołowe Mountains, SW Poland January 2015 Zeitschrift für Geomorphologie 59(Suppl. 1):211-226

Study on microstructure mechanism of sandstone based …

S TUDY ON MICROSTRUCTURE MECHANISM OF SANDSTONE BASED ON COMPLEX NETWORK THEORY. L IU G UANNAN, Y E D AYU, L IANG X IN, Z HU X IAOQIAN, G AO F ENG 28 JOURNAL OF M EASUREMENTS IN E NGINEERING.M ARCH 2020, V OLUME 8, ISSUE 1 distribution with high average path length. As transition from rule network to random network, Fig. 1(c) shows the degree of WS small world network.

Lithology Differentiation and Bitumen/Water Separation …

2013-3-23 · based on the wireline logs from chosen area only. The physical mechanism of the difference needs to be studied further. And the wireline logs from other areas in Athabasca oil sands will be investigated. Conclusions This study presents the results on lithology differentiation and …

Sedimentological analysis and reservoir characterization ...

2017-6-1 · The Johan Sverdrup field was discovered in 2010 by exploration well 16/2–6, drilled by PL501 operator Lundin Norway and partners Statoil and Maersk Oil in the Norwegian part of the North Sea (Fig. 1A).The trap is structural-stratigraphic, and is located at the southern end of the Utsira High, a complex basement-cored mega-closure (Fig. 1B).). Johan Sverdrup is a giant field, with an ...

Experimental investigation of deformation mechanisms ...

2013-8-19 · [1] Shear‐enhanced compaction in shallow sandstone reservoirs has been investigated in laboratory experiments using high‐pressure triaxial testing of poorly lithified sandstone and sand. We have studied the deformation mechanism involved during shear‐enhanced compaction and controlling parameters for yield stress at varying confining pressures for sandstone/sand with different grain ...

Sand Production Mechanism and Changes of Rock …

2016-1-8 · The mechanism of rock failure includes mechanical failure and chemical failure. The chapter examines appraisal experiments of sand production on changing formation properties that combine the case of unconsolidated sandstone reservoirs in Bohai Bay. It reviews the mechanism of sand production from the standpoint of experiments.

Sandstone dikes

2011-1-5 · 72_062. Sand squirts viewed on a bedding plane. The random orientation of these cross sections suggest the mechanism is not tectonic. MT. Quartz Meadow Gulch. [47.053844,-114.818573] Dikes related to shortening 69_389. Sandstone dike parallel to cleavage in the Martinsburg formation. Belvidere, NJ. Stop 12 p125 of GSA guide. 72_081.

Mechanisms of modulation and differentiation in ...

2020-12-29 · Over the past 39 years of publication, STEM CELLS has played an important role in the understanding of mesenchymal stem/stromal cell (MSC) modulation, self-renewal, and differentiation by publishing key manuscripts in the field. Our top-cited and most downloaded manuscripts each year are almost always in this field. With MSCs now close to commercialization and clinical availability in the ...

Mechanisms and controls on the formation of sand intrusions

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract: Sandstone intrusions are found in all sedimentary environments but have been reported most commonly from deep-water settings. They also appear to be more frequently developed in tectonically active settings where applied tectonic stresses facilitate development of high fluid pressures within the sediments.

Experimental investigation of deformation mechanisms ...

Shear-enhanced compaction in shallow sandstone reservoirs has been investigated in laboratory experiments using high-pressure triaxial testing of poorly lithified sandstone and sand. We have studied the deformation mechanism involved during shear-enhanced compaction and controlling parameters for yield stress at varying confining pressures for sandstone/sand with different grain sizes ...

Influence of micro‐pore structure in tight sandstone ...

mechanisms, various methods were combined to describe the micro- pore structure in the Chang 6 tight sandstone reservoir in the Huaqing area, Ordos Basin, China. Nuclear magnetic resonance (NMR) was combined with displacement experiments to determine the distribution of oil and water in pores of different scales before and after water flooding.

Sand Control: Why and How?

1991-12-9 · sand in place without unduly restricting productivity. n Perils of sand production. At worst, sand production threatens a well. Voids can form behind the pipe, causing formation subsi-dence and casing collapse. The well may also fill with sand and cease flowing. Or the surface equipment may be catastroph-ically damaged by erosion or plugging.

(PDF) Sandstone Diagenesis: The Evolution of Sand to Stone ...

Sandstone diagenesis: the evolution of sand to stone R.H. WORDEN* and S.D. BURLEY†,‡ *Department of Earth Sciences, University of Liverpool, Brownlow Street, Liverpool L69 3GP, UK †BG Group, Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK ‡Basin Dynamics Research Group, School of Geology and Geography, University of Keele, Keele ST5 5BG, UK INTRODUCTION TO DIAGENESIS metamorphism.

EZH2 variants differentially regulate polycomb repressive ...

2018-12-6 · Polycomb repressive complex 2 (PRC2) is responsible for establishing and maintaining histone H3K27 methylation during cell differentiation and proliferation. H3K27 can be mono-, di-, or trimethylated, resulting in differential gene regulation. However, it remains unknown how PRC2 specifies the degree and biological effects of H3K27 methylation within a given cellular context.

Experimental investigation of deformation mechanisms ...

Deformation mechanisms in shallow sandstone reservoir conditions Packing, porosity, grain rearrangement, and grain fracturing are important Cam‐Clay model is used to compare yield stress and porosi...

Experimental investigation of deformation mechanisms ...

Experimental testing provides insights into the deformation mechanism during hydrostatic and axial compression of coarse- and fine-grained sands with different packing including (1) natural coarse-grained sandstone, (2) densely packed fine-grained sand, and (3) loosely packed fine-grained sand.

[PDF] Sandstone Diagenesis: The Evolution of Sand to Stone ...

Sandstone Diagenesis: The Evolution of Sand to Stone. ates where geochemical reactions approach completion, gibbsite, kaolin group minerals and smectites form from aluminosilicate precursors. In cooler, temperate climates a greater variety of clay minerals occurs in weathering profiles reflecting metastable, intermediate breakdown products of ...

Sandstone Reservoir Wettability Alteration Due to Water ...

2020-5-13 · sand production in sandstone reservoirs [20]. A study in 2016 showed that the use of UF-nano SiO. 2. can reduce the amounts of sand production and had a little effect on permeability [21]. The stability of the nanoparticles in smart water for injection into the sandstone reservoirs can