Unrest at the Laguna del Maule volcanic field 2005–2020: renewed acceleration of deformation

The Laguna del Maule volcanic field in Chile has been exhibiting unrest since 2005. New GPS and InSAR data reveal a second episode of accelerated deformation beginning in late 2016 and continuing through May 2020, with an uplift rate > 290 mm/year between 2019 and 2020. To explain the spatial and temporal pattern of deformation, we apply a dynamic model of viscous magma flowing through a conduit into a fluid-filled reservoir surrounded by a heterogeneous, viscoelastic crust. A Monte Carlo procedure optimizes the ellipsoid reservoir geometry and the inlet pressure history. The two episodes of accelerating uplift are each modeled with a pressure increase rate of $\sim $ ∼ 9 MPa/year. Since 2016, 0.10 km3 of magma was injected into the system for a total of 0.37 km3 since 2005.

Supplemental Material: Quantitative reconstruction of pore-pressure history in sedimentary basins using fluid escape pipes

Background information, methods, and data.<br>

Supplemental Material: Quantitative reconstruction of pore-pressure history in sedimentary basins using fluid escape pipes

Background information, methods, and data.<br>

Fast Permeability Estimation of an Unconventional Formation Core by Transient-Pressure History Matching

Summary Unconventional resources are of great importance in the global energy supply. However, the ultralow permeability, which is an indicator of the producibility, makes the unconventional production challenging. Therefore, the permeability is one of the critical petrophysical properties for formation evaluation. There are many existing approaches to determine permeability in the laboratory using core analysis. The methods can be divided into two categories: steady-state and unsteady-state approaches. The steady-state approach is a direct measurement using Darcy's law. This approach has disadvantages because of the accuracy in the measurement of low flow rate and the long run time. The unsteady-state approach includes pulse decay, oscillating pressure, and Gas Research Institute methods. These approaches are complicated in terms of setups and interpretations. Both steady-state and unsteady-state approaches typically have a constraint on the maximum differential pressure. We propose a novel unsteady-state method to determine the permeability by transient-pressure history matching. This approach involves simulation and experiments. On the experiment side, the ultralow-permeability core undergoes 1D CO2-flooding experiments, during which the transient pressure is monitored for history matching. On the simulation side, the transient-pressure history is simulated using the finite-volume method incorporating real-gas pseudopressure and table lookup to deal with the nonlinearity in fluid properties and singularity during phase transition. The free parameter permeability in the simulation is adjusted for history matching to determine the rock permeability. Our new unsteady-state approach is developed for fast and convenient permeability estimation for unconventional formation cores. This approach is a valuable addition to existing permeability measurement methods.

Literature as discursive interstice

Starting with a famously popular case of literary genesis, which is the rewriting of the theatre play English Without a Teacher in the new variant of The Bald Soprano, this paper aims at analysing the complex relationship between textual objects of literary pretension and the literary space. The paper’s assumed perspective derives from the pragmatics of literary discourse (cf. Maingueneau, 2007), while at the same time it is concerned with analysing the processual features of literary phenomena. It seems that these features can only be analysed in relation to the metamorphoses of the social and cultural imaginary. Emphasizing these relational features of the notion of literature across history and also emphasizing the capacity of literature to remain in a process of continual metamorphosis while being in close contact with the textual objects which seek to challenge its stability, and at the same time, emphasizing the status of literature as ‘discursive interstice’ or as ‘self-constituting discourse’, the paper sets out to show the fact that textual objects which aim at transgressing the ‘literary space’ are in fact the signals released from the pressure history and the cultural metamorphoses it has generated exercises on the literary phenomenon. This pressure seems to have offered literature a transgressive dimension.