Scholarly record
QUANTITY AND COMPOSITION OF RESIDUAL PORE WATER EXTRACTED FROM SAMPLES OF THE BAZHENOV SOURCE ROCK OF WEST SIBERIA, RUSSIAN FEDERATION
Abstract
The research was aimed to study the pore water volume and chemical composition in the isolated core samples of the Bazhenov source rock formation taken from four different oil fields in West Siberia, Russian Federation. The approach is based on the complex laboratory methods of the investigation such as Dean-Stark and evaporation methods, the X-ray spectrometry, mass-spectrometric study (ICP-MS), water and Pfeffer's solution extracts. It was found that the samples contain three types of pore water: free groundwater, physically bounded water, presumably capillary water, and chemically bounded water. By using direct laboratory techniques quantity of residual pore water was found to vary within 0.51пїЅ3.49 wt.%. The quantitative results of the microcomponents (Li, V, B, Ba, Th, U, Sr etc.) and rare earth elements (REE) in the pore waters and the rock samples were also determined. Determined values of rock cation exchange capacity vary within 3.98пїЅ19.50 meq/100g of rock, which exceeds previously published data by factor of two, but integrally correspond to composition of rock clay fraction of the analysed samples. Since start of Bazhenov oil production in 1968 no free water has been produced and therefore Bazhenov formation was considered to be water-free. The results of the research show substantial amount of formation water in the Bazhenov rock samples and provide a solid basis for re-evaluation of hydrocarbon resources and reserves of Bazhenov formation, as well as improving quality of well log petrophysical calibrations, especially for electric, nuclear-magnetic resonance and dielectric methods. The research workflow also included laboratory studies of hydrogen and oxygen isotopic compositions for three Bazhenov water samples, which were extracted from rock samples in a retort at 200пїЅ? for 5 hours. Isotopic composition of hydrogen was found in the range ?2H VSMOW values from пїЅ64.5пїЅ to пїЅ63.8пїЅ, of oxygen ?18O VSMOW values from -2.0пїЅ to +1.4пїЅ. These ranges are in a good agreement with values characteristic for formation waters and brains associated with petroleum reported for many sedimentary basins. Isotope analysis of water from flowback fluid co-produced with oil in one of Bazhenov wells showed that water genesis is different to that of Bazhenov formation water. The studied flowback fluid is very close in isotopic composition to artificial fluid pumped in the Bazhenov formation interval to enhance oil recovery. With ?2H VSMOW values -74пїЅ and -76пїЅ for hydrogen and ?18O VSMOW values -7пїЅ and -9пїЅ for oxygen respectively, both fluids correspond to formation waters of West Siberia overlying the Bazhenov formation. The results suggest no detectable contribution of Bazhenov formation water in flowback fluid co-produced with oil in investigated Bazhenov well.
Publication Impact Profile
Publication details
References15
Nesterov, I. I. Oil and gas pools: the fundamentals of formation, prospecting, and exploitation. Russian Geology and Geophysics, vol. 50 / issue 4, pp. 320-326, 2009.
Gurari, F. G., Weiz, E. Y., Melenevskiy, V. N. Formation conditions and exploration methods of oil deposits in the argillites of the Bazhenov formation. M.: Nedra, 1988.
Dorofeeva, T. V., Krasnov, S. G., Lebedev, V. A., Petrova, G. V., Posenenko, B. V. The oil collectors of the Bazhenov Formation of the Western Siberia. M.: Nedra, 1983.
Silich, V. E. Pore waters of the Bazhenov shales of the Oil Deposite Salymskoe. The structure and oil and gas content of the bazhents of Western Siberia, pp. 87-91, 1985.
Kazak, E. S., Kazak, A. V., Bogdanovich, N. N. Type and Composition of Bazhenov Formation Pore Water based on Laboratory Research. Geomodel 2016 - 18th Science and Applied Research Conference on Oil and Gas Geological Exploration and Development. Gelendzhik, Russia on September 12–15, p. 4, 2016.
Kazak, E. S., Bogdanovich, N. N., Kazak, A. V., Mamiashev, T. V., Kostin, D. K. Quantification of residual pore water content and analysis of water extract of the Bazhenov formation samples (Western Siberia). Oil Industry, vol. 4, pp. 48-52, 2017.
Kireeva, T. A., Kazak, E. S. Pore water in the west Siberian Bazhenov formation rocks and their transformation after hydrothermal pressure. Oil and gas geology, vol. 1, pp. 77-89, 2017.
Thyne, G., Brady, P. Evaluation of formation water chemistry and scale prediction: Bakken Shale. Applied Geochemistry, vol. 75, pp. 107-113, 2016.
Chalmers, G. R., Bustin, M. R. The Effects and Distribution of Moisture in Gas Shale Reservoir Systems. AAPG Annual Convention and Exhibition. Louisiana, New Orleans., 2010.
Rikhvanov, L. P., Usoltsev, D. G., Ilenok, S. S., Ezhova, A. V. Mineralogical and geochemical features of the bazhenov formation, west siberia, according to nuclear physics and electron microscopic methods of research. Bulletin of the Tomsk Polytechnic University, vol. 326 / issue 1, pp. 50-63, 2015.
Ketris, M. P., Yudovich, Y. E. Estimations of Clarkes for Carbonaceous biolithes: World averages for trace element contents in black shales and coals. International Journal of Coal Geology, vol. 78 / issue 2, pp. 135-148, 2009.
Taylor, S. R. Abundance of chemical elements in the continental crust: a new table. Geochimica et Cosmochimica Acta, vol. 28 / issue 8, pp. 1273-1285, 1964.
Ezersky, D. M., Filimonov, A. Y., Borisenko, N. N. B. S. A., Rudakovskaya, S. Y., Ostapchuk, M. A. Assessment of water content in rocks of the Bazhenov formation. Oil Industry, vol. 10, pp. 38-43, 2015.
Graf, D. L., Meents, W. F., Friedman, I., Shimp, N. F. The origin of saline formation waters, II. Isotopic fractionation by shale micropore systems. Ill. Calcium chloride. Illinois State Geological Survey. Circular Series, vol. 397, p. 60, 1966.
Craig, H. Isotopic Variations in Meteoric Waters. Science, vol. 133 / issue 3465, p. 1702, 1961.
Citing literature
Number of times cited according to Crossref: 5
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.
