Investigation of Bazhenov formation using thermal core logging technique

UDK: 550.8.023

DOI: 10.24887/0028-2448-2017-3-22-27

Key words: thermal logging, Bazhenov formation, geomechanics

Authors: Yu.A. Popov, E.Yu. Popov, E.M. Chekhonin, A.V. Gabova, R.A. Romushkevich, M.Yu. Spasennykh (Skolkovo Institute of Science and Technology, RF, Moscow), D.E. Zagranovskaya (Gazpromneft NTC LLC, RF, Saint-Petersburg)

Fast continuous non-contact profiling of rock thermal conductivity tensor components (along and perpendicular to the bedding) and volumetric heat capacity on cores within the intervals of the Bazhenov formation depths has been performed for 8 wells drilled in Krasnoleninskiy arch (Palyanovskoye field), Priobskoye upland (South Priobskoye field), Nizhnevartovskiy arch (Orekhovo-Ermakovskoye and Yuzhnoye oilfields), and Vyngoyakhskiy bank (Vyngoyakhskoye oilfield) of West Siberia. The profiling has been done in core storages at full set of recovered cores from Bazhenov fm. without preliminary machining process and any core destruction, with full preservation of core collections. Spatial resolution of thermal conductivity profiling is about 1-2 mm, it provides detalization of the structure of thin geological objects like Bazhenov fm. The total volume of the studied core collections was about 2400 cores, that significantly exceeds the volume of previously studied cores from low-permeable reservoirs. Thermal core logging data has been converted to detailed profiles of total organic carbon, sonic velocities, elastic moduli (Young’s modulus and Poisson’s ratio), natural radioactivity, density, and acoustic anisotropy (Tomsen’s parameter) with the help of the original techniques of thermal core logging data processing. Obtained data set of Bazhenov fm. rock properties is important for basin and petroleum system modeling, hydrodynamic modeling of thermal EOR methods, efficiency assessment, design and optimization of hydrocarbon recovery methods, geology structure investigations, estimation of petroleum reserves, and geomechanical modeling. Continuous high-resolution thermal profiling can replace or complement core scratching for heterogeneity rock analysis and for geomechanical properties estimation.

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