1,720,990 research outputs found
Fluid-rock interactions and their implications on carbonate reservoir characterization
Full text linkThe objective of my research has been to define the interactions between fluid and rock properties at different environmental conditions and observation scale to reduce the uncertainty in the carbonate reservoir characterization.
Here, I integrate field observations, subsurface data, petrophysical and frictional laboratory measurements focusing on carbonate-bearing rocks to better constrain factors controlling fluid-rock interactions with applications to active petroleum systems. In particular, I focus on the Burano-Bolognano carbonate petroleum system that extends from the northern sector of the Majella mountain to the Cigno/Vallecupa oil fields, in Abruzzo Region (Central Italy).
This area is of particular interest because of the following reasons:
It has received great attention by oil companies in the past for its structural, stratigraphic, and geodynamic evolution, which led it to be an important target for hydrocarbon exploration during the past century. For this reason, it is characterized by a public dense dataset of wells, reports, maps, etc.
It allows to study all petroleum system elements (with the exception of the source rock), such as: reservoir, seal, traps, and migration pathways at field scale.
It allows to understand the influence of subsurface fluids on the petrophysical properties of carbonate reservoir rocks since the outcropping portions of reservoir interval are both clean and hydrocarbon-saturated. This allows measuring and comparing the variations of petrophysical properties between hydrocarbon-bearing and hydrocarbon-free samples.
It is regarded as an analogue of a faulted and fractured reservoir for other carbonate petroleum systems worldwide and in particular in the Adriatic area.
The results of my research quantify the influence of fluid properties in changing of the petrophysical and frictional properties of the bearing-carbonate rocks. The presence of viscous fluids, such as heavy hydrocarbons, at ambient temperature defines an increase of the wave velocities respect to those of the unsaturated samples and determines a possible strengthening and stiffening of the reservoir rock. With increasing temperature, distinct downward trends are recorded, especially for the P-wave velocities. Moreover, the presence of fluids along faults promotes a slow slip behaviour, which was more marked with the presence of clay minerals along fault surface.
Finally, starting from these results, I simulate the evolution of the Burano-Bolognano petroleum system and the related fluids movements, inferring that within this petroleum system the vertically hydrocarbon migration is driven by fractures/faults and the subsequently lateral migration determinates a gradual oil biodegradation with an increase of its density
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Frictional strength, stability, and healing properties of basalt faults for CO2 storage purposes.
No full textDispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Oil distribution in outcropping carbonate-ramp reservoirs (Maiella Mountain, Central Italy). Three-dimensional models constrained by dense historical well data and laboratory measurements
No full textHeavy oil and bitumens have been exploited in Italy during the past, in particular over the Maiella Mountain’s northwest flank (Central Italy), where relatively undeformed, hydrocarbon-bearing carbonate- ramp reservoirs of the Bolognano Formation crop out. These res- ervoirs represent the exhumed analog of a wider petroleum system that has been investigated also in the subsurface by exploration activities, both onshore and offshore (Central Adriatic).
Here we present, for the first time, a historical data set composed of 180 shallow wells drilled over the area in 1942 by a company named Azienda Lavorazione Bitumi Asfalti; we dig- itally reconstructed this data set, integrating it with field obser- vations, laboratory measurements, and thin-section analysis. Using Petrel (mark of Schlumberger) three-dimensional software, we modeled the reservoir and the hydrocarbon distribution, also calculating volumes of hydrocarbons in place.
In our work, we demonstrate the presence of these quite homogeneous, porous carbonate reservoirs over the whole re- gion, and we identify internal reservoir geometries characterized by clinoforms, likely resulting from a large-scale depositional cross-bedding and progradation.
We also infer a different function of faults in the hydrocarbon accumulations: major faults were able to create independent compartments during migration, whereas minor, more recent elements did not control hydrocarbon accumulation, likely post- dating a main lower-Pliocene migration phase.
We believe that the observations derived from our work can represent a good analog for carbonate-ramp reservoirs elsewhere, may help in identifying appropriate modeling solutions, and can be used as calibration for future renewed exploration efforts in the region, both onshore and offshore
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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