Neogene Stratigraphy Of The Eskişehir Graben And The Investigation Of Coal Deposition By Seismic Reflection Method

The study area is located within the Eskişehir Graben, north of Ağapınar village in the Sevinç district and east of Eskişehir City. Miocene deposits unconformably overlie the basement of Paleozoic metamorphites and Mesozoic ophiolites. The m1 series constituted by gravel, sandstone and claystone is observed at the base of Miocene deposits. The overlying m2 series, from bottom to top, represents a sequence of partly conglomerate, green claystone, coal, gray sandstone, dark gray to green siltstone, bituminous marl, claystone, coal, green claystone, sandstone and fine grained conglomerate. The m3 series of limestone and conglomerate is patchy and Pliocene deposits consisting of loose gravel, claystone overly them. The stratigraphical succession in the region covered by Neogene deposits has been investigated during surveys and reservoir drilling in licence areas belonging to MTA. High resolution shallow seismic reflection data were collected on two lines crossing each other considering field conditions (vegetated areas, irrigation channels, Porsuk River, railway line, etc.) and locations of boreholes made in the basin. These collected data were assessed in the Data Processing Center of the Seismic Research Division of the Geophysical Research Department (MTA),to produce the final sections of the seismic reflection. The data were then correlated with borehole data on or adjacent to the lines. The surface of reflection (yellow colored level) which could be continuously traced through all sections was deduced as the Paleozoic basement corresponded to ophiolites in borehole data. Reflection surfaces which are observed in areas, where the seismic basement deepened by multi-staged discontinuity surfaces of the seismic basement and rely especially on slopes of seismic basement, were determined as coal-claycontactzone. It was also revealed that, data obtained from drilling works continuing in the region correlate with geophysical interpretations made on seismic profiles.

Keywords:

Eskişehir, Stratigraphy Coal, Seismic reflection,

PDF

___

Gang, T., Goulty, N. R. 1997. Seismic inversion for coal seam thicknesses: Trials from the Belvoir coalfield, England. Geophysical Prospecting 45, 535–549.
Gochioco, L. M. 1991a. Advances in seismic reflection profiling in U.S. coal exploration. The Leading Edge 10, No. 12, 24–29.
Gochioco, L. M. 1991b. Application of the seismic interactive interpretation work station for the coal industry. Mining Engineering 43, 1057–1061.
Gözler, Z., Cevher, F., Ergül, E., Asutay, J. H. 1996. Orta Sakarya ve Güneyinin Jeolojisi. Maden Tetkik ve Arama Genel Müdürlüğü Rapor No. 9973 (unpublished), Ankara.
Izladı, E., Toksoy, A.T., Kutlu, S., Pektaş, V., Aykaç, S., Özerk, Z. R., Öztay, E., Kurt, B. B.,Gergin, Ş., Köse, K. 2010. Eskişehir-Alpu Neojen Havzasının Jeofizik Sismik Yansıma Etütü ile Araştırılması. Maden Tetkik ve Arama Genel Müdürlüğü Jeofizik Etütleri Dairesi Raporu, 1136, Ankara (unpublished).
Hendrick, N. 2006. Integrated P-Wave / PS-Wave Seismic Imaging for Improved Geological Characterisation of Coal Environments. ACARP Project C13029.
Henson, H., Jr., Sexton, J. L. 1991. Premine study of shallow coal seams using high-resolution seismic reflection methods. Geophysics 56, 1494–1503.
Miller, R. D., Saenz, V., Huggins R. J. 1992. Feasibility of CDP seismic reflection to image structures in a 220- m deep, 3-m thickcoal zone near Palau, Coahuila, Mexico. Geophysics 57, 1373–13811.
Ocakoğlu, F. 2007. A re-evaluation of the Eskisehir Fault Zone as a recent extensional structure in NW Turkey. Journal of Asian Earth Science 31, 2, 91- 103.
Peters, T. 2005. The successful integration of 3D seismic into the mining process: Practical examples from Bowen Basin underground coal mines. 165-169.
Pietsch, K., Slusarczyk, R. 1992. The applications of high resolution seismics in Polish coal mining. Geophysics 57, 171–180.
Siyako, F., Coşar, N., Çokyaman, S., Coşar, Z. 1991. Bozüyük - İnönü - Eskişehir - Alpu – Beylikova - Sakarya Çevresinin Tersiyer Jeolojisi ve Kömür Olanakları. Maden Tetkik ve Arama Genel Müdürlüğü Rapor No. 9281, Ankara (unpublished).
Şengüler, İ. 2010. Coal Explorations in Turkey: New Projects and New Reserves. Twenty-Seventh Annual International Pittsburgh Coal Conference (October 11-14, 2010). Abstract Booklet, 11, Istanbul, Turkey.
Şengüler, İ. 2011. Eskişehir Sivrihisar Havzası Neojen Kompilasyonu ve Kömür Potansiyeli. Maden Tetkik ve Arama Genel Müdürlüğü Rapor No.11473, Ankara (unpublished).
Widess, M. B. 1973, “ How thin is a thin bed?” Geophysics
, 6, 1176-1180.

ISSN: 0026-4563
Yayın Aralığı: Yılda 3 Sayı
Başlangıç: 1950
Yayıncı: Cahit DÖNMEZ

Arşiv