Abstract Many scales of heterogeneity are present in clastic reservoirs. Important heterogeneities occur at the small-scale as a result episodic or periodic fluctuations depositional process. These manifested quasi-periodic grain size variations 10-3 to 1 metre. In hierarchical description sediments (the basis sequence stratigraphy), these stratal elements known laminae beds. The fluctuating well determined pore and pore-throat distributions. effects throat distributions on two-phase flow...

Modern scanning electron microscopes often include software that allows for the possibility of obtaining large format high-resolution image montages over areas several square centimeters. Such are typically automatically acquired and stitched, comprising many thousand individual tiled images. Images, collected a regular grid pattern, rich source information on factors such as variability in porosity distribution mineral phases, but can be hard to visually interpret. Additional quantitative...

The question of the number permeability measurements that are required to estimate mean a reservoir interval is not generally considered during evaluation. Permeability sampling traditionally carried out with core plugs (1.0-1.5 inch or 2.5-3.8 cm cylindrical samples) at spacing about 1 foot 0.3 m. This has evolved from considerations practicality, cost and need for conservation, takes little account underlying rock variability.

Lacustrine carbonate rocks form important hydrocarbon accumulations along the Brazilian continental margin, some of which are contained in oil fields coquinas one main reservoirs (viz. Campos Basin). The complexity and heterogeneity these deposits make them a challenge terms reservoir description. For necessary classification paleoenvironmental interpretation coquinas, it is essential to evaluate many aspects including biological (such as productivity), sedimentological (energy regime...

In this paper, we explore the application of artificial neural network ('deep learning') methods to problem detecting chemical-protein interactions in PubMed abstracts. We present here a system using multiple Long Short Term Memory layers analyse candidate interactions, determine whether there is relation and which type. A particular feature our use unlabelled data, both pre-train word embeddings also LSTM network. On BioCreative VI CHEMPROT test corpus, achieves an F score 61.51% (56.10%...

Well testing is a critical part of any evaluation carbonate reservoir discovery. Well-test interpretation in reservoirs poses additional challenges to those normally faced the process clastic reservoirs. The range different boundary and crossflow relationships that are generated during well by complex porosity systems often poorly quantified understood. volume over which pressure response effective also source great uncertainty could be at exploration/appraisal stage project. In this paper,...

A new well testing response from lateral cross flow within layers is described. The occurs when there extremely low effective vertical permeability in the system at larger scale. Low actually accentuates layering and reduces whilst enhancing within-layer heterogeneities. investigated using numerical simulation of end-member models complex geologically realistic architecture high net-to-gross fluvial systems. This ‘ramp’ shown to form one member a family test pressure transient responses....

Geological reservoirs can be extensively fractured but the well-test signatures observed in wells may not show a pressure transient response that is representative of naturally (NFRs): for example, one indicates two distinct pore systems (i.e. mobile fractures and immobile matrix). Yet, production behaviour still influenced by these fractures. To improve exploitation hydrocarbons from NFRs, we therefore need to our understanding fluid-flow Multiple techniques are used detect presence extent...

The effects of small-scale structure are frequently ignored in reservoir simulation, although they may have a significant effect on hydrocarbon recovery. Many sandstones exhibit lamination, and such rock structures, permeability vary by an order magnitude over distances centimetre or less. Frequently, laminations inclined with respect to the pressure gradient, which gives rise cross-flow within unit. In this case tensor be used represent effective bed. paper geological single-phase flow is...

Abstract Interpreting well-tests in (fractured) carbonate reservoirs poses significant challenges because these often demonstrate triple porosity system (fracture-matrix-vugs) characteristics. However, there is no "unique" system: The matrix can behave as a double porosity/dual permeability whilst the fractures provide third system; may be two fracture systems and single matrix; vugs (macropores), mesopores micropores to very large contrasts permeabilities. Modelling challenging of need...

Coquinas are significant producing facies in the pre-salt reservoirs of Brazil and Angola. This paper describes an analogue model study to help understand reservoir characterization coquina reservoirs. Porosity permeability measured 39 core plugs from a single bed Lower Cretaceous outcrop NE have been combined three-dimensional geological for use simulation. A training image derived geometry Holocene Western Australia controlled distribution bed-scale petrophysical properties outcrop....

Summary Geochemistry provides a natural, but poorly exploited, link between reservoir geology and engineering. We summarize some current ap-plicationsof geochemistry to description stress that, because of their strong interactions with mineral surfaces water, nitrogen oxygen compounds in petroleum may exert an important influence on the pressure/volume/temperature (PVT) properties petroleum, viscosity wettability. The distribution these reservoirs is heterogenous submeter scale partly...

ABSTRACT The paramagnetic clay mineral illite can have important controls on fluid permeability and microporosity in sedimentary rocks. Increases content of a few percent reduce by several orders magnitude. Traditional X-ray diffraction (XRD) techniques for quantifying be very time consuming, requiring significant sample preparation, generally examine only relatively small volume. In contrast, technique based magnetic susceptibility described here is rapid, cheap, sensitive, nondestructive,...