Quantification of residual pore water content and analysis of water extract of the Bazhenov formation samples (Western Siberia)

UDK: 553.98:556.3

DOI: 10.24887/0028-2448-2017-4-48-52

Key words: chemical composition of stratal water, Bazhenov formation, cation exchange capacity, pore fluid

Authors: E.S. Kazak(Lomonosov Moscow State University, RF, Moscow), N.N. Bogdanovich, A.V. Kazak (Skolkovo Institute of Science and Technology, RF, Moscow), T.V. Mamiashev, D.K. Kostin (Gazpromneft NTC LLC, RF, Saint-Petersburg)

The paper presents the results of experimental studies to quantify the residual pore water content in the core samples of the Bazhenov formation with natural water saturation taken from two wells at the Youzhnoye and Vyngayakhinskoye fields, West Siberia using the direct laboratory methods of the investigation (Dean Stark and evaporation methods). The chemical and mineralogical rock samples compositions obtained using the X-ray diffraction analysis are shown here. The quantitative results of the microcomponents (Li, Be, V, Cr, Co, Ni, Cu, Zn Rb, Cs, U, Pb) and rare earth metals (REE) in the pore waters and in the rock samples are found using mass-spectrometric study (ICP-MC) and presented here for the first time. It also contains the measured values of the rocks cation exchange capacity (Pfeffer method) and results of the pore waters composition of Bazhenov formation obtained via composition analysis of the water extracts. It was found that the gravity groundwater content, presumably capillary water, in the studied rock samples is 0.14-2.35 % (wt), the residual pore water content is 0.42-3.65 % (wt). The total content of Na⁺, K⁺ and Cl^- in the pore waters of the Bazhenov formation are 17.09÷79.21 g/L. Using Pfeffer method it was discovered that the cation exchangers of the studied core samples contain Na⁺, K⁺, Са²⁺, Mg²⁺ and Fe³⁺ that concentrations change with the depth in wells. The measured values of the shales cation-exchange capacity are 3.98÷19.50 meq/100g of rock and correspond to the clay minerals content in them.

References

1. Stepanov V.P., Akhapkin M.YU., Tabakov V.P., Osnovnyye itogi i perspektivy razrabotki bazhenovskoy svity Salymskogo mestorozhdeniya (In Russ.), Geofizika = Current situation and the further prospects of the Bazhenov suite development in the Salym Field, 2007, no. 4, pp. 211–218.

2. Cenegy L.M., McAfee C.A., Kalfayan L.J., Field study of the physical and chemical factors affecting downhole scale deposition in the North Dakota Bakken formation, SPE 140977-MS, 2011.

3. Kazak E.S., Kazak A.V., Bogdanovich N.N., Forma i sostav porovoy vodyporod bazhenovskoy svity po rezul’tatam laboratornykh issledovaniy (Form and composition of porous water of the rocks of the Bazhenov suite according to the results of laboratory tests), Proceedings of 18th Scientific and Practical Conference on the Exploration and Development of Oil and Gas Fields "EAGE-Geomodel’ 2016", 12–15 September 2016, Gelendzhik.

4. Kireyeva T.A., Kazak E.S., Pore water in the West Siberian Bazhenov formation rocks and their transformation after hydrothermal pressure (In Russ.), Geologiya nefti i gaza = The journal Oil and Gas Geology, 2017, no. 1, pp. 77–89.

5. Zaks S.L., Burmistrova V.F., K voprosu issledovaniya sostava i svoystv svyazannoy vody v neftyanykh kollektorakh (On the issue of studying the composition and properties of bound water in the oil reservoir), Proccedings of Petroleum Institute. Academy of Sciences of the USSR, 1956, V. VII, pp. 222–235.

6. Silich V.E., Porovyye vody porod bazhenovskoy svity Salymskogo neftyanogo mestorozhdeniya (Pore waters of the rocks of the Bazhenov suite of the Salym oil field), Collected papers "Stroyeniye i neftegazonosnost’ bazhenitov Zapadnoy Sibiri" (The structure and oil and gas content of the bazhents of Western Siberia), 1985, pp. 87–91.

7. Zlochevskaya R.I., Korolev V.A., Elektropoverkhnostnyye yavleniya v glinistykh porodakh (Electrosurface phenomena in clay rocks), Moscow Publ. of MSU, 1988, 177 p.

8. Korolev V.A., Associated water in rocks: new facts and problems (In Russ.), Sorosovskiy obrazovatel’nyy zhurnal, 1996, no. 9, pp. 79–85.

9. Zatenetskaya N.P., Porovyye vody glinistykh porod i ikh rol’ v formirovanii podzemnykh vod (Pore waters of clay rocks and their role in the formation of groundwater), Moscow: Publ of USSR AS, 1963, 142 p.

10. Zatenetskaya N.P., Porovyye vody osadochnykh porod (Pore waters of sedimentary rocks), Moscow: Nauka Publ., 1974, 158 p.

11. Kryukov P.A., Gornyye, pochvennyye i ilovyye rastvory (Mountain, soil and silt solutions), Novosibirsk: Nauka Publ., 1971, 219 p.

12. Abramov V.YU., Cryogenic metamorphizaition chemical compozition of underground water (In Russ.), Razvedka i okhrana nedr, 2014, no. 5, pp. 16–20.

13. Rikhvanov L.P. et al., Mineralogical and geochemical features of the Bazhenov formation, West Siberia, according to nuclear`physics and electron` microscopic methods of research (In Russ.), Izvestiya Tomskogo politekhnicheskogo universiteta = Bulletin of the Tomsk Polytechnic University, 2015, V. 326, no. 1, pp. 50–63.

14. Pluman I.I., Uranium content of black bituminous argillites of the Upper Jurassic of the West Siberian Plate(In Russ.), Geokhimiya, 1971, no. 11, pp. 1362–1368.

15. Ezerskiy D.M. et al., Assessment of water content in rocks of the Bazhenov formation (In Russ.), Neftyanoye khozyaystvo = Oil Industry, 2015, no. 10, pp. 38–43.