... is particularly critical in heterogeneous formations such as pre-salt carbonates, where the conventional resolution of the logs is insufficient to distinguish matrix porosity from karsts with high permo-porosity. In this context, acoustic imaging can be used to quantify this portion of the porous framework. Our...

... ABSTRACT Setting casing as close as possible to the top of the reservoir is critical in deep water carbonate exploration drilling strategy in Malaysia for several reasons, such as the pressure difference from the overburden and mud loss related to vugs, fractures, and karsts. Missing...

... with the carbonates of Barra Velha Fm. As they do not contain radioactive elements, it is a challenge to identify them using conventional petrophysical evaluation methods. In this research we propose the petrophysical evaluation of carbonate rocks in the pre-salt section of the Sepia Field, Santos Basin, with a view...

... pre-salt carbonates, complex depositional and diagenetic processes generated a porous medium with vugs, fractures, and caves of various sizes that are rarely appropriately sampled. In intervals with large pores, samples collected will represent the rock matrix, underestimating laboratory measurements...

... ft/hr with correction in microporous reservoirs where the T 1 longitudinal polarization time of most formation fluids does not exceed 5 sec. In challenging carbonate reservoirs whose T 1 exceeds 5 sec, the ROP correction enabled a drilling speed increase from 65 ft/hr to at least 110 ft/hr...

... analysis techniques. The technique uses the extensive dynamic mobile charge length scales from dielectric measurements (Maxwell-Wagner effect) to refine our interpretation of easily measured NMR multi-exponential response. Although based on carbonates with clay-free surface conductance, adaptation...

... in the transverse relaxation time (T 2 ) in the Brazilian pre-salt carbonates. T 2 values above and below 100 ms are associated with free and irreducible fluids, respectively. Above the oil-water contact, free fluid is interpreted as oil when calculating saturation and permeability, assuming the rock has only...

... petrophysical properties. The study leverages the published six hundred core measurements on synthetic samples, clean sand, shaly sand, clean carbonates, and shaly carbonates selected from different reservoirs. The analysis of this database establishes the plausible correlative link of electrical, acoustic...

... transport well logging log analysis mud logging / surface measurements drilling data acquisition drilling fluids and materials spwla 62 upstream oil & gas synthetic cutting carbonate operational best practice gabriela singer structural geology nmr drill cutting analysis-methodology...

... such as effective medium modeling, are not reliable for assessments of mechanical properties in complex formations such as carbonates, because solid skeleton of carbonates does not consist of granular minerals with ideal shapes. The effective medium models also overlook both the spatial distribution...

... ABSTRACT Marine carbonate reservoir formation evaluation is typically not concerned about the presence of clays, provided that the deposition of good quality carbonate platform facies is normally limited to clear waters. Conversely, the South Atlantic lacustrine Pre-Salt deposits contain...

... ABSTRACT Carbonate facies identification presents a great challenge to geologists because of complex chemico-physical alterations and biological origins. Traditionally, a detailed carbonate facies analysis is performed by visually segmenting the thin-section images into petrographic elements...

... with very tight carbonates and organic carbon-rich formations. This paper presents a method to measure the total organic carbon (TOC), which, in this paper, represents the organic carbon in the matrix (kerogen and coal), and to estimate oil saturation in such challenging environment. A suite of wireline...

... of a complex reservoir system compartmentalized by an active structural setting. The formation consists of interstratified dolomite, limestone and sandstone with strong diagenesis overprint overlain by shale deposits that play the double role of source rock and seal. The pay zones, within the carbonates...

...) to establish a new directional permeability model combining NMR and directional resistivity measurements, and (c) to test the reliability of the new model for permeability assessment in formations with multi-modal porosity (e.g. carbonate and tight sandstone formations). We numerically simulate...

... ABSTRACT Assessment of net pay cutoffs in carbonates is more challenging than in clastics due to inherent heterogeneity of pore architecture and permeability. Historically, the success rate of flowing perforations is low, and operators tend to "over-perforate" to capture all potential flowing...

..." plays. It is thinly bedded, composed of mixed fine grain carbonates (siliciclastic lithotypes) and exhibits highly contrastive "stiff" and "soft" facies (Thiercelin and Plumb, 1994). Reservoir Characterization well logging sonic data gamma ray Artificial Intelligence workflow lateral...

... the highest positive impact on well productivity. Rock Type 2 had intermediate values of porosity (6–8%) and TOC (3–4.5%) and moderate source potential and storage. Rock Type 3 had the highest carbonate (60–80%) content and poor storage and source rock potential (2–4% TOC, 4–7% porosity). Rock Type 3...

... to be modeled including their saturation dependence. Myers (1991) developed quantitative relationships between thin section point counts and Archie's parameters for different pore systems (vuggy, intergranular, and microporosity) associated with a global carbonate dataset. The commonly used interpretation...

... (Permeability, Lithology, Porosity and Lithofacies). It is important to recognize that none of the standard PTRi directly account for multi-modal pore geometries. carbonate saturation spwla 58 Schlumberger petrophysical rock type permeability Symposium throat radius PRT Winland capillary...