Gas hydrates, flares seeps offshore Romania, a review

The civilisation is in the continuous search for energy resources, either already in use or new ones, for future needs. The gas hydrates are one of the unconventional resources that have been identified, evaluated and in the future will be probably exploited. The semi-enclosed Black Sea Basin has an...

Full description

Bibliographic Details
Main Authors: DINU, Corneliu, MUNTEANU, Ioan, TAMBREA, Dorina, PANIN, Nicolae
Format: Text
Language:English
Published: Zenodo 2018
Subjects:
Mak
Online Access:https://dx.doi.org/10.5281/zenodo.2549559
https://zenodo.org/record/2549559
Description
Summary:The civilisation is in the continuous search for energy resources, either already in use or new ones, for future needs. The gas hydrates are one of the unconventional resources that have been identified, evaluated and in the future will be probably exploited. The semi-enclosed Black Sea Basin has an excellent potential for free gas and gas hydrate accumulation, on account of its anoxic water regime which favours the preservation of organic matter in the sediments (the chemocline lies at 110–140 m depth). Regions outside the stability field of gas hydrates, namely, the shelf and upper slope, show a high gas content in the sediments. The Black Sea Basin has been the focus for numerous research projects, which led to the identification of the BSR that might be associated with the gas hydrate zones. Beside the gas hydrates, numerous gas occurrences have been recognized on the seafloor of the Black Sea in different sectors and at different depths, including shelf and slope of Romanian Black Sea area, and a significant amount of data have been published. The current synthesis aims to make a review of the results published in the last 15 years describing geological structure and evolution of the Black Sea Basin, as well as bottom sediments, gas hydrates, flare and escape structures Offshore Romania. : {"references": ["Afanasenkov, A.P., Nikishin, A.M., Obukhov, A.N., 2007. Geology of the Eastern Black Sea, Scientific World, Moscow, 198 p. (in Russian).", "Andreassen, K., Mienert, J., Bryn, P., Singh, S.C., 2000. A double gas-hydrate related bottom-simulating reflector at the Norwegian continental margin. Ann. N.Y. Acad. Sci., 912, 126\u2013135.", "Bega, Z., Ionescu, G., 2009. Neogene structural styles of the NW Black Sea region, offshore Romania. The Leading Edge, 28, 1082-1089.", "Baba, K., Yama da, Y., 2004. BSRs and associated reflections as an indicator of gas hydrate and free gas accumulation: an example of accretionary prism and forearc basin system along the Nankai Trough, off central Japan. Resour. Geol., 54, 11\u201324.", "Bialas, J. (Ed.), 2014. FS Maria S. Merian Fahrtbericht/Cruise Report MSM-34/1 & 2 SUGAR Site. Berichte aus dem GEOMAR Helmholtz- Zentrum f\u00fcr Ozeanforschung Kiel, 15.", "Clennell, M.B., Hovland, M., Booth, J.S., Henry, P., Winters, W.J., 1999. Formation of natural gas hydrates in marine sediments: 1. Conceptual model of gas hydrate growth conditioned by host sediment properties. J. Geophys. Res., 104, 22985-23003.", "Cloetingh, S., Spadini, G., Van Wees, J.D., Beekman, F., 2003. Thermo-mechanical modelling of Black Sea Basin (de)formation. Sedimentary Geology, 156, 169-184.", "Constantinescu, A.M., Toucanne, S., Dennielou, B., Jorry, S.J., Mulder, T., Lericolais, G., 2015. Evolution of the Danube Deep-Sea Fan since the Last Glacial Maximum: new insights into Black Sea water-level fluctuations. Marine Geology, 367, 50-68.", "Dickens G.R, Quinby-Hunt MS, 1994. Methane hydrate stability in sea water. Geophys Res Lett., 21(19), 2115\u20132118.", "Dimitrov, L.I., 2002. Mud volcanoes \u2013 the most important pathway for degassing deeply buried sediments. Earth-Science Reviews, 59, 49-76.", "Dinu, C., Wong, H.K., Tambrea, D., Matenco, L., 2005. Stratigraphic and structural characteristics of the Romanian Black Sea shelf. Tectonophysics, 410, 417-435.", "Doglioni, C., Busatta, C., Bolis, G., Marianini, L., Zanella, M., 1996. Structural evolution of the eastern Balkans (Bulgaria). Marine and Petroleum Geology, 13, 225-251.", "du Fornel, 1999. Architecture du c\u00f4ne profond du Danube en sismique r\u00e9flexion 2D. MSc Thesis, Universit\u00e9 de Montpellier II, France.", "Duley, P., Fogg, A., 2009. Old dogs and new tricks; unlocking the hydrocarbon potential of the Romanian Black Sea: Ana and Doina gas fields and the role of inversion in derisking. The Leading Edge, 28, 1090-1096.", "Egorov, V., Nasu, C., Gulin, S.B., Artemov, Y., Stokozov, N., Kostova, S., 2003. Modern concepts of the Medium-efficiency and environmental role of earth methane gas deposits from the Black Sea bottom. Marine Environmental Journal, 3, 5-26.", "Egorov, V., Artemov, Y., Gulin, S., Polikarpov, G., 2011. Methane seeps in the Black Sea: discovery, quantification and environmental assessment. Black Sea/Mediterranean Enviroment Journal, 17, 171- 185.", "Erickson A.J., Von Herzen R. P., 1978. Downhole temperature measurements and heat flow data in the Black Sea \u2013 DSPD Leg 42B, in Ross DA, Neprochnov YP and the Scientific Party of DSDP Leg 42B - Initial reports of the Deep Sea Drilling Project Leg 42B. Washington, DC, 1085-1101.", "Finetti, I., Bricchi, G., Del Ben, A., Pipa n, M., Xuan, Z., 1988. Geophysical study of the Black Sea. Bollettino di Geofisica Teorica ed Applicata XXX, 197-324.", "Garcia-Gil, S., Vilas, F., Garcia-Garcia, A., 2002. Shallow gas features in incised-valley fills (R\u00eda de Vigo, NW Spain): a case study. Cont Shelf Res., 22, 2303-2315", "Gillet, H., Lericolais, G., Rehault, J.-P., Dinu, C., 2003. La stratigraphie oligo- miocene et la surface d'\u00e9rosion messinienne en mer Noire, stratigraphie sismique haute r\u00e9solution. C. R. Geoscience, 335, 907-916.", "Gillet, H., 2004. La stratigraphie tertiaire et la surface d'errosion messinienne sur les marges occidentales de la Mer Noire: stratigraphie seismique haute resoulution, L'universite de Bretagne Occidentale, Brest, 260 p.", "Gillet, H., Lericolais, G., R\u00e9hault, J.-P., 2007. Messinian event in the black sea: Evidence of a Messinian erosional surface. Marine Geology, 244, 142-165.", "Ginsburg, G.D., Soloviev, V.A., 1998. Submarine Gas Hydrates, St. Petersburg, Russia.", "G\u00f6r\u00fcr, N., 1988. Timing of opening of the Black Sea basin. Tectonophysics, 147, 247-262.", "Golmshtok, A.Y., Zonenshain, L.P., Terekhov, A.A., Shainurov, R.V., 1992. Age, thermal evolution and history of the Black Sea Basin based on heat flow and multichannel reflection data. Tectonophysics, 210, 273-293.", "Graham, R., Kaymakci, N., Horn, B., 2013. The Black Sea: Something Different? Geo Expro, 60-63.", "Greinert, J., Artemov, Y., Egorov, V., De Batist, M., McGinnis, D., 2006. 1300-m-high rising bubbles from mud volcanoes at 2080 m in the Black Sea: Hydroacoustic characteristics and temporal variability. Earth and Planetary Science Letters, 244, 1-15.", "Hillman, J. I. T., Klaucke, I., Bialas, J., Feldman, H., Drexler, T., Awwiller, D., Atgin, O., \u00c7if\u00e7i, G., Badhani, S., 2018. Gas migration pathways and slope failures in the Danube Fan, Black Sea. Marine and Petroleum Geology, 92, 1069-1084.", "Holbrook, W. S., Hoskins, H., Wood, W. T., Stephen, R. A., Lizarralde, D., 1996. Methane Hydrate and Free Gas on the Blake Ridge from Vertical Seismic Profiling. Science, 273, 5283, 1840 p.", "Hs\u00fc, K.J., Giovanoli, F., 1979. Messinian event in the black sea. Palaeogeography, Palaeoclimatology, Palaeoecology, 29, 75-93.", "Hunt, J.M., 1974. Hydrocarbon geochemistry of the Black Sea. In: Degens ET, Ross DA (eds) The Black Sea-geology, chemistry and biology. AAPG Memoir 20. Tulsa, Oklahoma, 499-504.", "Hyndman, R.D., Spence, G.D., 1992. A seismic study of methane hydrate marine bottom simulating reflectors. J. Geophys. Res., 97(5), 6683-6698.", "Ion, G., Lericolais, G., Nouze, H., Panin, N., Ion, E., 2002. Seismo-acoustic evidence of gases in sedimentary edifices of the paleo-Danube realm. CIESM Workshop, 17, 91-95.", "Ivanov, M.V, Vainstein, M.B, Galchenko, V.F, Gorlator, S.N, Lein, A.Y., 1983. Distribution and geochemical activity of bacteria in sediments of the western part of the Black Sea. In: Geochemical processes in the western part of the Black Sea. Bulgarian Academy of Science, Sofia, 150-181.", "Ivanov, M.K, Limonov, A.F, van Weering, TjCE, 1996. Comparative characteristics of the Black Sea and Mediterranean Ridge mud volcanoes. Mar Geol., 132, 253-271.", "Ivanov, M.K., Limonov, A.F., Woodside, J.M., 1998. Extensive deep fluid flux through the sea floor on the Crimean continental margin (Black Sea). Geological Society, London, Special Publications, 137, 195.", "Ivanov, M.V, Pimenov, N.V, Rusanov, II, Lein, AYu., 2002. Microbial processes of the methane cycle at the north-western shelf of the Black Sea. Estuarine, coastal and shelf science, 54, 589-599.", "Ivanov, Z., 1988. General Framework of the Rhodope Massif Geological and Structural Development, in the Balkanides Setting. Bulletin De La Societe Geologique De France, 4, 227-240.", "Jipa, D.C., Olariu, C., 2009. Dacian basin: depositional architecture and sedimentary history of a Paratethys sea. National Institute of Marine Geology and Geo-ecology, Bucharest.", "Judd, A., Hovland, M., 2007. Seabed Fluid Flow: the Impact on Geology, Biology and the Marine Environment. Cambridge University Press, Cambridge, UK.", "Karstens, J., and Berndt, C., 2015, Seismic chimneys in the Southern Viking Graben \u2013 Implications for palaeo fluid migration and overpressure evolution. Earth and Planetary Science Letters, 412, p. 88-100.", "Kazmin, V.G., Shreider, A.A., Shreider, A.A., 2007. Age of the Western Black Sea Basin according to an analysis of the anomalous magnetic field and geological data. Oceanology, 47, 571-578.", "Kvenvolden, K.A., 1998. A primer on the geological occurrence of gas hydrate. Geological Society Special Publication, 9-30.", "Kvenvolden, K.A., 1993. Gas hydrates-geological perspective and global change. Reviews of Geophysics, 388/31, 173-173.", "Khriachtchevskaia, O., Stovba, S., Popadyuk, I., 2009. Hydrocarbon prospects in the Western Black Sea of Ukraine. The Leading Edge, 28, 1024-1029.", "Khriachtchevskaia, O., Stovba, S., Stephenson, R., 2010. Cretaceous-Neogene tectonic evolution of the northern margin of the Black Sea from seismic reflection data and tectonic subsidence analysis. Geological Society, London, Special Publications, 340, 137-157.", "Konerding, C., 2005. Mio-Pliocene sedimentation and structure of the Romanian shelf, northwestern Black Sea, Geowissenschaften. Hamburg University, Hamburg, 140 p.", "Konerding, C., Dinu, C., Wong, H.K., 2010. Seismic sequence stratigraphy, structure and subsidence history of the Romanian Black Sea shelf. Geological Society, London, Special Publications, 340, 159-180.", "Kruglyakova, R.P., Byakov, Y.A., Kruglyakova, M.V., Chalenko, L.A., Shevtsova, N.T., 2004. Natural oil and gas seeps on the Black Sea floor. Geo-Marine Letters, 24, 150-162.", "Kutas, R.I., Kobolev, V.P., Tsvyashchenko, V.A., 1998. Heat flow and geothermal model of the Black Sea depression. Tectonophysics, 291, 91-100.", "Kutas, R.I., Paliy, S.I., Rusakov, O.M., 2004. Deep faults, heat flow and gas leakage in the northern Black Sea. Geo-Marine Letters, 24, 163-168.", "Kutas, R., Poort, J., 2008. Regional and local geothermal conditions in the northern Black Sea. International Journal of Earth Sciences, 97, 2, 353-363.", "Kvenvolden, K.A., 1998. A primer on the geological occurrence of gas hydrate. Geological Society Special Publication, 9-30.", "Lericolais, G., Guichard, F., Morigi, C., Minereau, A., Popescu, I., Radan, S., 2010. A post Younger Dryas Black Sea regression identified from sequence stratigraphy correlated to core analysis and dating. Quaternary International, 225, 199-209.", "Lericolais, G., Bourget, J., Popescu, I., Jermannaud, P., Mulder, T., Jorry, S., Panin, N., 2013. Late Quaternary deep-sea sedimentation in the western Black Sea: New insights from recent coring and seismic data in the deep basin. Global and Planetary Change, 103, 232-247.", "Letouzey, J., Biju-Duval, B., Dorkel, A., Gonnard, R., Krischev, K., Montadert, L., Sungurlu, O., 1977. The Black Sea: a marginal basin: geophysical and geological data, in: Biju-Duval, B., Montadert, L. (Eds.), Structural History of the Mediterranean Basins. Editions Technip, Paris, 363-376.", "Limonov, A.F, van Weering, TjCE, Kenyon, N.H, Ivanov, M.K, Meisner, L.B, 1997. Seabed morphology and gas venting in the Black Sea mud volcano area: Observations with the MAK-1 deep-tow sidescan sonar and bottom profiler. Mar Geol., 137, 121-136.", "L\u00fcdmann, T., Wong, H.K., Konerding, P., Zillmer, M., Petersen, J., Fl\u00fch, E., 2004. Heat flow and quantity of methane deduced from a gas hydrate field in the vicinity of the Dnieper Canyon, northwestern Black Sea. Geo-Marine Letters, 24, 182-193.", "L\u00fcdmann, T., Wong, H.K., Baristeas, N., 2007. Characterization of gas hydrates and free gas occurrences in the northwestern Black Sea, unpublished work.", "Matenco, L., Bertotti, G., Leever, K., Cloetingh, S., Schmid, S., T\u0103r\u0103poanc\u0103, M., Dinu, C., 2007. Large-scale deformation in a locked collisional boundary: Interplay between subsidence and uplift, intraplate stress, and inherited lithospheric structure in the late stage of the SE Carpathians evolution. Tectonics, 26, TC4011.", "Matenco, L., Kr\u00e9zsek, C., Merten, S., Schmid, S., Cloetingh, S., Andriessen, P., 2010. Characteristics of collisional orogens with low topographic buildup: an example from the Carpathians. Terra Nova, 22, 155-165.", "Matoshko, A., Gozhik, P., Semenenko, V., 2009. Late Cenozoic fluvial development within the Sea of Azov and Black Sea coastal plains. Global and Planetary Change, 68, 4, 270-287.", "Merey, S., Sinayuc, C., 2016. Analysis of the Black Sea sediments by evaluating DSDP Leg 42B drilling data for gas hydrate potential. Marine and Petroleum Geology, 78, 151-167.", "Merten, S., Matenco, L., Foeken, J.P.T., Stuart, F.M., Andriessen, P.A.M., 2010. From nappe-stacking to out-of-sequence post-collisional deformations: Cretaceous to Quaternary exhumation history of the SE Carpathians assessed by low-temperature thermochronology. Tectonics, 29, 1-28.", "Michaelis W, Seifert R, Nauhaus K, Treude T, Thiel V, Blumenberg M, Knittel K, Gieseke A, Peterknecht K, Pape T, Boetius A, Ama nn R, J\u00f8rgensen BB, Widdel F, Peckma nn J, Pimenov N, Gulin MB, 2002. Microbial reefs in the Black Sea fueled by anaerobic oxidation of methane. Science, 297, 1013-101.", "Munteanu, I., Matenco, L., Dinu, C., Cloetingh, S., 2011. Kinematics of backarc inversion of the Western Black Sea Basin.Tectonics, 30, 5, 21.", "Munteanu, I., 2012. Evolution of the western Black Sea: Kinematic and sedimentological inferences from geological observations and analogue modelling, Amsterdam, Ipskamp Drunkkers B.V., Utrecht Studies in Earth Sciences.", "Munteanu, I., Matenco, L., Dinu, C., Cloetingh, S., 2012. Effects of large sea-level variations in connected basins: the Dacian-Black Sea system of the Eastern Paratethys. Basin Research, 24, 583-597.", "Munteanu, I., Willingshofer, E., Sokoutis, D., Matenco, L., Dinu, C., Cloetingh, C., 2013. Transfer of deformation in back-arc basins with a laterally variable rheology: constraints from analogue modelling of the Balkanides - Western Black Sea inversion. Tectonophyiscs.", "Munteanu, I., Willingshofer, E., Matenco, L., Sokoutis, D., Cloetingh, S., 2014. Far-field contractional polarity changes in models and nature. Earth and Planetary Science Letters, 395, 0, 101-115.", "Naudts, L., Greinert, J., Artemov, Y., Staelens, P., Poort, J., Van Rensbergen, P., De Batist, M., 2006. Geological and morphological setting of 2778 methane seeps in the Dnepr paleo-delta, northwestern Black Sea. Marine Geology, 227, 177-199.", "Neprochnov, Y.P., Kosminskaya, I.P., Malovitsky, Y.P., 1970. Structure of the crust and upper mantle of the Black and Caspian Seas. Tectonophysics, 10, 517-525, 531-538.", "Neretin, L.N, B\u00f6ttcher, M.E, J\u00f8rgensen, B.B, Volkov, II ,, L\u00fcschen, H., Hilgenfeldt, K., 2004. Pyritization processes and greigite formation in the advancing sulfidization front in the Upper Pleistocene sediments of the Black sea. Geochim Cosmochim Acta, 68/9, 2081-2093.", "Nikishin, A. M., Korotaev, M. V., Ershov, A. V., Brunet, M.-F., 2003. The Black Sea basin: tectonic history and Neogene-Quaternary rapid subsidence modelling. Sedimentary Geology, 156, 1-4, 149-168.", "Nikishin, A.M., Ershov, A.V., Nikishin, V.A., 2010. Geological History of Western Caucasus and Adjacent Foredeeps Based on Analysis of the Regional Balanced Section. Doklady Earth Sciences, 430, 155-157.", "Nikishin, A.M., Okay, A.I., T\u00fcys\u00fcz, O., Demirer, A., Amelin, N., Petrov, E., 2015a. The Black Sea basins structure and history: New model based on new deep penetration regional seismic data. Part 1: Basins structure and fill. Marine and Petroleum Geology, 59, 638-655.", "Nikishin, A.M., Okay, A., T\u00fcys\u00fcz, O., Demirer, A., Wannier, M., Amelin, N., Petrov, E., 2015b. The Black Sea basins structure and history: New model based on new deep penetration regional seismic data. Part 2: Tectonic history and paleogeography. Marine and Petroleum Geology, 59, 656-670.", "Okay, A.I., Sahinturk, O., 1997. Geology of the Eastern Pontides, in: Robinson, A.G. (Ed.), Tectonic-Sedimentary Evolution of the North-Tethyan Margin in the Central Pontides of Northern Turkey, 291-312.", "Paull, C.K., Ussler, W., Borowski, W.S., Spiess, F.N., 1995. Methane-rich plumes on the Carolina 424 continental rise: associations with gas hydrates. Geology, 23, 89-92.", "Panin, N., Jipa , D., 2002. Danube River Sediment Input and its Interaction with the North-western Black Sea. Estuarine, Coastal and Shelf Science, 54, 551-562.", "Panin, N., 2003. The Danube Delta. Geomorphology and Holocene Evolution: a Synthesis / Le delta du Danube. G\u00e9omorphologie et \u00e9volution holoc\u00e8ne : une synth\u00e8se. G\u00e9omorphologie : relief, processus, environnement, 247-262.", "Peckmann, J., Reimer, A., Luth, U., Luth, C., Hansen, B.T, Heinicke, C., Hoefs, J., Reitner, J., 2001. Methane-derived carbonates and authigenic pyrite from the northwestern Black Sea. Mar. Geol., 177, 129-150.", "Popescu, I., Lericolais, G., Panin, N., Wong, H. K., Droz, L., 2001. Late Quaternary channel avulsions on the Danube deep-sea fan, Black Sea. Marine Geology, 179, 1-2, 25-37.", "Popescu, I., Lericolais, G., Panin, N., Normand, A., Dinu, C., Le Drezen, E., 2004. The Danube submarine canyon (Black Sea): morphology and sedimentary processes. Marine Geology, 206, 1-4, 249-265.", "Popescu, I., De Batist, M., Lericolais, G., Nouz\u00e9, H., Poort, J., Panin, N., Versteeg, W., Gillet, H., 2006. Multiple bottom-simulating reflections in the Black Sea: Potential proxies of past climate conditions. Marine Geology, 227, 163-176.", "Popescu, I., Lericolais, G., Panin, N., Batist, M., Gillet, H., 2007. Seismic expression of gas and gas hydrates across the western Black Sea. Geo-Marine Letters, 27, 173-183.", "Poort, J., Vassilev, A., Dimitrov, L., 2005. Did postglacial catastrophic flooding trigger massive changes in the Black Sea gas hydrate reservoir?: Terra Nova, 17, 2, 135-140.", "Popov, S.V., Shcherba, I.G., Ilyina, L.B., Nevesskaya, L.A., Paramonova, N.P., Khondkarian, S.O., Magyar, I., 2006. Late Miocene to Pliocene palaeogeography of the Paratethys and its relation to the Mediterranean. Palaeogeography, Palaeoclimatology, Palaeoecology, 238, 91-106", "Riboulot, V., Cattaneo, A., Sultan, N., Garziglia, S., Ker, S., Imbert, P., Voisset, M., 2013. Sea-level change and free gas occurrence influencing a submarine landslide and pockmark formation and distribution in deepwater Nigeria. Earth and Planetary Science Letters, 375, 78-91.", "Riboulot, V., Cattaneo, A., Scalabrin, C., Gaillot, A., Jouet, G., Ballas, G., Marsset, T., Garziglia, S., Ker, S., 2017. Control of the geomorphology and gas hydrate extent on widespread gas emissions offshore Romania. Bull. Soc. g\u00e9ol. Fr., 188, 26.", "Ricou, L.E., Burg, J.P., Godfriaux, I., Ivanov, Z., 1998. Rhodope and vardar: the metamorphic and the olistostromic paired belts related to the Cretaceous subduction under Europe. Geodinamica Acta, 11, 285-309.", "Robinson, A., Spadini, G., Cloetingh, S., Rudat, J., 1995. Stratigraphic evolution of the Black Sea: inferences from basin modelling. Marine and Petroleum Geology, 12, 821-835.", "R\u00f6gl, F., 1999. Mediteranean and Paratethys. Facts and hypotheses of an Oligocene to Miocene paleogeography. Geologica Carpathica, 50, 339-349.", "R\u00f6mer, M., Sahling, H., Pape, T., Bahr, A., Feseker, T., Wintersteller, P., Bohrma nn, G., 2012. Geological control and magnitude of methane ebullition from a high-flux seep area in the Black Sea \u2013 the Kerch seep area. Marine Geology, 319-322, 57-74.", "Ross, A.D., Stoffers, P., Trimonis, E.S., 1978. Black Sea sedimentary framework, in: Institution, W.H.O. (Ed.), DSDP Leg. 42 B. Woods Hole Oceanographic Institution, Washington, D.C., 359-372.", "Saulea, E., Popescu, I., Sandulescu, J., 1969. Lithofacias map atlas, 1:200000 (in Romanian and French), IGR (Ed.). IGR, Bucharest.", "Senes, J., 1973. Correlation hypotheses of the Neogene Tethys and Paratethys. Giorn. Geol., 39, 271-286.", "Shillington, D.J., White, N., Minshull, T.A., Edwards, G.R.H., Jones, S.M., Edwards, R.A., Scott, C.L., 2008. Cenozoic evolution of the eastern Black Sea: A test of depth-dependent stretching models. Earth and Planetary Science Letters, 265, 360-378.", "Sloan, E.D., 2003. Fundamental principles and applications of natural gas hydrates. Nature, 426, 353-363.", "Sloan, E.D., Koh, C., 2007. Clathrate hydrates of natural gases. CRC press.", "Shnyukov, E., F., 1999. Mud Volcanoes