A symplectic toric orbifold is a compact connected orbifold M , a symplectic form ω on M , and an effective Hamiltonian action of a torus T on M , where the dimension of T is half the dimension of M . We prove that there is a one-to-one correspondence between symplectic toric orbifolds and convex rational simple polytopes with positive integers attached to each facet.

Abstract Radial drilling-fracturing, the combination of radial drilling and hydraulic fracturing, can guide fractures toward target area effectively enhance recovery low permeable reservoir. In this paper, based on stress superposition principle, we establish an analytical model to predict fracture initiation pressure (FIP) shale failure mode for drilling-fracturing applied in formations. contr...

The study of in situ stress from image logs is a key factor for understanding regional stresses and the exploitation hydrocarbon resources. This work presents comprehensive geomechanical analysis two eastern Algerian fields to infer magnitudes principal components field orientation. Acoustic borehole measurements were used this research aid our development. studied In-Adaoui Bourarhat encompass...

Porous and permeable crystalline rocks have the potential of being hydrocarbon reservoirs. In many cases, reservoir properties are created by rock-altering physico-chemical processes occurring in near-surface environment. Hydrocarbon reservoirs altered granitoids may comprise both arenaceous (clay-poor) argillaceous (clay-rich) palaeoregoliths, hence outcrop analogues from various environments ...

Abstract This study focuses on hydrothermal alteration in the geothermal reservoir of Cerro Pabellón (Andean Cordillera, Northern Chile). It is based CP2A and CP5A production wells drilled above a local normal fault presenting unlike hydraulic properties. Cuttings from 300 to 1555 m depth were sampled analyzed using X-ray diffraction (XRD) observe distribution minerals crystal chemistry variati...

The buoyancy–induced parallel flow in a vertical cylindrical porous layer with annular cross–section is analysed. A radial thermal gradient caused by uniformly distributed heat source assumed to induce the buoyant flow. boundaries are modelled as isothermal and permeable an external fluid reservoir. onset of convective instability analysed linearising governing equations for perturbations. para...

Explosive volcanic eruption requires that magma fragments into discrete parcels. Silicic magma can fragment through brittle failure or other processes that depend on the viscoelasticity of the melt. Owing to the low viscosity of basaltic magmas, however, the fragmentation mechanism must be different and will be governed by fluid mechanics alone. We perform a series of decompression experiments ...

amir kabir dam was built in varian strait, at 23 km north of karaj in 1961. the dam is multipurpose and its maim aims are the spring floods control, supplying potable water for tehran city, producing electricity and providing irrigation water. different pollutants which discharge to the river finally enter to the dam reservoir. determining the pollution loads of the dam sub-catchments can help ...

A series of Mb 3.8-5.5 induced seismic events in the midcontinent region, United States, resulted from injection of fluid either into a basal sedimentary reservoir with no underlying confining unit or directly into the underlying crystalline basement complex. The earthquakes probably occurred along faults that were likely critically stressed within the crystalline basement. These faults were lo...