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Consisting of a block-in-matrix rubble zone and a large translating sandstone block, the DCL has been active in various stages for over 100 years and has been an area of concern since the construction of roads, and eventually I70, through the landslide. INTRODUCTION The DeBeque Canyon Landslide (DCL) is a complex slope failure occurring along the banks of the Colorado River and Interstate Highway 70 (I70) near the town of DeBeque, Colorado, USA. Given that the DCL has continued to move slowly for many decades, modeling results indicate that external forcings, such as fluctuating pore pressure and erosion are required to maintain an active slide.ġ. We find that calculated deformations in FLAC3D are comparable with movement rates observed using lidar. This paper presents an analysis, using FLAC3D, of the interaction of the block-in-matrix zone with the intact upper block and a comparison of computed and observed deformations. The wealth of detailed geotechnical data and displacement measurements available lend themselves to the creation of a comprehensive reevaluation of the triggers and mechanisms of movement of the slide. This monitoring also captured block raveling, shallow landslides, and rockfalls within the slide mass. Movement rates of around 3 to 6 cm per year were able to be estimated, without the use of targets or georeferencing. The Colorado School of Mines Computational Geomechanics Laboratory has been collecting terrestrial LiDAR data of the DCL since 2016. In some naturally fractured tight gas reservoirs, horizontal wells and/or multilateral wells can be used to provide the stimulation required for commerciality.ĪBSTRACT The DeBeque Canyon Landslide (DCL) is a complex slope failure located on the south-eastern bank of the Colorado River in western Colorado. Normally, a large hydraulic fracture treatment is required to produce gas economically. Tight gas reservoirs have one thing in common-a vertical well drilled and completed in the tight gas reservoir must be successfully stimulated to produce at commercial gas flow rates and produce commercial gas volumes. However, much of the same technology applies to tight carbonate and to gas shale reservoirs. In this chapter, production of gas from tight sandstones is the predominant theme.
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Production of gas from coal seams is covered in a separate chapter in this handbook. Many of the low permeability reservoirs that have been developed in the past are sandstone, but significant quantities of gas are also produced from low permeability carbonates, shales, and coal seams. Tight gas is the term commonly used to refer to low permeability reservoirs that produce mainly dry natural gas.