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• W4231596598 abstract "Interpretation of Borehole Measurements Acquired in Laminated Clastic Sequences Subject To Mud-Filtrate Invasion Subhadeep Chowdhury; Subhadeep Chowdhury The University of Texas at Austin Search for other works by this author on: This Site Google Scholar Carlos Torres-Verdin; Carlos Torres-Verdin The University of Texas at Austin Search for other works by this author on: This Site Google Scholar Alberto Mezzatesta Alberto Mezzatesta Baker Atlas Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, September 2004. Paper Number: SPE-90199-MS https://doi.org/10.2118/90199-MS Published: September 26 2004 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Chowdhury, Subhadeep, Torres-Verdin, Carlos, and Alberto Mezzatesta. Interpretation of Borehole Measurements Acquired in Laminated Clastic Sequences Subject To Mud-Filtrate Invasion. Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, September 2004. doi: https://doi.org/10.2118/90199-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Annual Technical Conference and Exhibition Search Advanced Search AbstractThe effect of mud-filtrate invasion on resistivity, nuclear, and formation tester wireline measurements is poorly understood when the formation of interest is laminated on a scale below the vertical resolution of borehole logging instruments. This paper describes a quantitative study to assess the effect of mud-filtrate invasion on well-log measurements acquired in thinly laminated clastic sequences.Synthetic models are constructed with varying proportions of shale and two types of sand. These models are used to simulate the process of mud-filtrate invasion. Each type of sand is assumed isotropic, homogeneous, water wet, and saturated with oil to the level of irreducible water saturation. Simulations of the process of mud-filtrate invasion yield 2D cross-sections of water saturation, salt concentration, and electrical resistivity in the invaded rock formations. These cross-sections are then used to simulate wireline resistivity, density, neutron, and formation tester measurements. Using standard interpretation techniques, saturation of original oil in place is calculated with all the simulated log measurements.Results indicate that for laminated sandy and shaly sand rock formations, induction (electrical resistivity), nuclear (porosity), and formation pressure tester (pressure) measurements are significantly affected by both the relative proportion of lithology and the invasion of mud filtrate. Water saturation in a laminated sandy rock formation can vary significantly when calculated with saturation and porosity exponents perpendicular and parallel to the bedding plane, respectively. Permeability calculated from dual-packer formation tester measurements can significantly depart from the effective average permeability in a composite and laminated sandy formation.Conventional induction resistivity instruments cannot distinguish between resistivities in the flushed and invaded zones when the volume of shale is higher than 50%. Presence of shale also causes a significant error in the estimated permeability.IntroductionOverbalance drilling causes invasion of mud-filtrate into porous rock formations. Of particular interest are thinly laminated sand-shale and sand-sand sequences, where individual laminations are much thinner than the vertical resolution of logging instruments. The phenomenon of mud-filtrate invasion has been extensively documented in the open technical literature (Dewan et al., 2001, Wu et al., 2004, and George et al., 2004). The process of mud-filtrate invasion is governed not only by the properties of mud but also by the petrophysical properties of the invaded rock formation. Rate of mudcake growth, an important factor that controls the length of invasion, depends on both permeability and porosity of the formation. In a composite rock formation, where a mixture of two different rocks constitutes a layered alternation, the spatial distribution of fluids resulting from the process of mud-filtrate invasion becomes a function of depth.The central objective of this paper is to study the effect of mud-filtrate invasion on several logging measurements acquired in sand-sand and sand-shale composite rock formations. A change in the relative proportions of shale and sand in a composite rock formation gives rise to various measurements of non-invaded and invaded zone resistivity, resistivity anisotropy (Rv/Rh), bulk density, neutron, and formation tester, all of which are different from the measurements that would be acquired in homogeneous sands or shales. As a result, the estimated hydrocarbon saturation departs from the actual in-situ saturation. Keywords: concentration, resistivity, proportion, porosity, resistivity reading, upstream oil & gas, hdil resistivity reading, rock formation, log analysis, well logging Subjects: Formation Evaluation & Management, Open hole/cased hole log analysis This content is only available via PDF. 2004. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4231596598 title " Interpretation of Borehole Measurements Acquired in Laminated Clastic Sequences Subject To Mud-Filtrate Invasion " @default.
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