Geochemical evaluation of hydrocarbon source rocks in the Chilingar oilfield along with measuring matrix effect, inert organic material and composition of the active kerogen

Authors

1 Faculty of Petroleum and Natural Gas Engineering, Sahand University of Technology, Tabriz, Iran

2 Department of Geology, National Iranian South Oil Company (NISOC), Ahwaz, Iran

Abstract

Source candidates for the Middle Cretaceous – Early Oligocene petroleum system in the Chilingar oilfield were geochemically evaluated using Rock-Eval pyrolysis and vitrinite reflectance measurements, along with taking matrix retention, inert OM and maturity effects into account. Moreover, the gas-oil ratio potential (GORP) factor was used to split the average live TOC and S2 parameters into the oil-prone and gas-prone constituents. Based on the results, Pabdeh and Gadvan formations have the highest and lowest hydrocarbon potential, respectively. According to the S2 vs. TOC diagram, the mineral retention effect and inert OM content are negligible for the Pabdeh formation. On the contrary, Kazhdumi and Gadvan samples show a significant mineral matrix effect and inert organic material, resulting in a substantial reduction of the hydrogen index and lower apparent quality. Based on the corrected-original parameters, Kazhdumi and Gadvan formations are categorized as mainly oil-prone and gas-prone source rocks, respectively. However, these formations show a low-to-fair quantity of live OM, due to the activities of the Khark-Mish paleo-high during the Cretaceous. In terms of thermal maturity, Pabdeh and Gurpi samples are immature, but Kazhdumi, Dariyan (the upper shaly layers) and Gadvan formations have entered into the preliminary stages of the main oil generation phase. Indeed, insufficient maturity of the source candidates (maximum Ro: 0.72) could be considered as a possible reason for the absence of hydrocarbon reserves in the Asmari and Bangestan reservoirs of the Chilingar oilfield.

Keywords

Main Subjects

References

Agha Nabati, A., 2004. Geology of Iran. Geological Survey of Iran, P. 586.
Ahmadi, A., Kamali, M.R., Abdolzadeh, S., Moosavi, M.H., Kabi-Mofrad, A., 2013. Organic Geochemistry of Upper Cretaceous (Gurpi Formation) and Paleogene (Pabdeh Formation) Source Rocks in Par-E-Siah Field, NW Izeh, Iran. Journal of Stratigraphy and Sedimentology Researches 28, 1-24. https://doi.org/20.1001. 1.20087888.1391.28.4.1.0.
Alavi, M., 2007. Structures of the Zagros fold-thrust belt in Iran. American Journal of Science 308, 1064-1095. https://doi.org/10.2475/09.2007.02.
Alizadeh, B., Maroufi, K., Fajrak, M., 2018. Hydrocarbon reserves of Gachsaran oilfield, SW Iran: Geochemical characteristics and origin. Marine and Petroleum Geology 92, 308-318. https://doi.org/10.1016/ j.marpetgeo.2017.08.040.
Alizadeh, B., Saadati, H., Samsami, J., Hosseini, S.H., Gandoumi, A., 2014. Studying of Changing Organic Carbon Content in Kazhdomi Formation in one of the Abadan Plain Oilfeild by Geochemical and Petrophysical Data. Advanced Applied Geology 4, 11-19.
Alizadeh, B., Sarafdokht, H., Rajabi, M., Opera, A., Janbaz, M., 2012. Organic geochemistry and petrography of Kazhdumi (Albian–Cenomanian) and Pabdeh (Paleogene) potential source rocks in southern part of the Dezful Embayment, Iran. Organic Geochemistry 49, 36-46. https://doi.org/10.1016/j.orggeochem.2012.05.0 04.
Asadi Mehmandosti, E., Alizadeh, B., Adabi, M.H., 2012. Geochemical Evaluation of Source Rocks and Crude Oils of Marun Oil Field with Rock-Eval Pyrolysis (VI) and Gas Chromatography Instruments. Scientific Quarterly Journal of Geosciences 21, 31-38. https://doi.org/10.22071/gsj.2011.54436.
Baudin, F., Disnar, J.R., Aboussou, A., Savignac, F., 2015. Guidelines for Rock–Eval analysis of recent marine sediments. Organic Geochemistry 86, 71-80. https://doi.org/10.1016/j.orggeochem.2015.06.009.
Behar, F., Beaumont, V., Penteado, H.L.D.B., 2001. Rock-Eval 6 technology: performances and developments. Oil & Gas Science and Technology 56, 111-134. https://doi.org/10.2516/ogst:2001013.
Bordenave, M., Huc, A., 1995. The Cretaceous source rocks in the Zagros foothills of Iran. Revue de L'institut Français du Petrole 50, 727-752. https://doi.org/10.2516/ogst:1995044.
Bordenave, M.L., Burwood, R., 1990. Source rock distribution and maturation in the Zagros orogenic belt: provenance of the Asmari and Bangestan reservoir oil accumulations. Organic Geochemistry 16, 369-387. https://doi.org/10.1016/0146-6380(90)90055-5.
Bordenave, M.L., Burwood, R., 1995. The Albian Kazhdumi Formation of the Dezful Embayment, Iran: one of the most efficient petroleum generating systems. In: B.J. Katz (Editor), Petroleum Source Rocks. Springer, pp. 183-207. https://doi.org/10.1007/978-3-642-78911-3_11.
Bordenave, M.L., Hegre, J.A., 2005. The influence of tectonics on the entrapment of oil in the Dezful Embayment, Zagros Foldbelt, Iran. Journal of Petroleum Geology 28, 339-368. https://doi.org/10.1111/j.1747-5457.2005.tb00087.x.
Bordenave, M.L., Hegre, J.A., 2010. Current distribution of oil and gas fields in the Zagros Fold Belt of Iran and contiguous offshore as the result of the petroleum systems. Geological Society, London, Special Publications 330, 291-353. https://doi.org/10.1144/SP330.14.
Dahl, B., Bojesen-Koefoed, J., Holm, A., Justwan, H., Rasmussen, E., Thomsen, E., 2004. A new approach to interpreting Rock-Eval S2 and TOC data for kerogen quality assessment. Organic Geochemistry 35, 1461-1477. https://doi.org/10.1016/j.orggeochem.2004.07.003.
Dembicki, H., 2009. Three common source rock evaluation errors made by geologists during prospect or play appraisals. AAPG Bulletin 93, 341-356.
Dembicki, H., 2016. Practical petroleum geochemistry for exploration and production. Elsevier. https://doi .org/10.1016/C2014-0-03244-3.
Espitalié, J., Deroo, G., Marquis, F., 1985. La pyrolyse Rock-Eval et ses applications. Deuxième partie. Revue de L'institut Français du Petrole 40, 755-784. https://doi.org/10.2516/ogst:1985045.
Espitalié, J., Makadi, K.S., Trichet, J., 1984. Role of the mineral matrix during kerogen pyrolysis. Organic Geochemistry 6, 365-382. https://doi.org/10.1016/0146-6380(84)90059-7.
Hunt, M.J., 1996. Petroleum geochemistry and geology, 2nd ed. WH Freeman and company, New York, 743 pp. https://doi.org/10.1021/ef960184w.
Kobraei, M., Sadouni, J.,Rabbani, A.R., 2019. Organic geochemical characteristics of Jurassic petroleum system in Abadan Plain and north Dezful zones of the Zagros basin, southwest Iran. Journal of Earth System Science 128, 1-18. https://doi.org/10.1007/s12040-019-1082-0.
Lalami, H.R.K., Hajialibeigi, H., Sherkati, S., Adabi, M.H., 2020. Tectonic evolution of the Zagros foreland basin since Early Cretaceous, SW Iran: regional tectonic implications from subsidence analysis. Journal of Asian Earth Sciences 204, 104550. https://doi.org/ 10.1016/j.jseaes.2020.104550.
Mahbobipour, H., Kamali, M.R., Solgi, A., 2016. Organic geochemistry and petroleum potential of Early Cretaceous Garau Formation in central part of Lurestan zone, northwest of Zagros, Iran. Marine and Petroleum Geology 77, 991-1009. https://doi.org/10.1016/j.marpetgeo.2016.05.004.
Maleki, B., Bazvandi, A., Senemari, S., Aramani, P., 2021. Kinetic evaluation of oil generation from potential source rocks using the Arrhenius model in Kilverkarim oilfield. Advanced Applied Geology 11, 157-168. https://10.22055/aag.2020.30235.2013.
Maroufi, K., Alizadeh, B., Rokni, E., Fajrak, M., 2017. Integrating Reservoir Geochemistry and Engineering Approaches to Investigate Connectivity of Asmari and Bangestan Reservoirs in Gachsaran Oilfield. Advanced Applied Geology 7, 27-39. https://doi.org/10.22055/aag.2017.20831.1650.
McCarthy, K., Rojas, K., Niemann, M., Palmowski, D., Peters, K., Stankiewicz, A., 2011. Basic petroleum geochemistry for source rock evaluation. Oilfield Review 23, 32-43.
Motiei, H., 1995. Petroleum geology of Zagros. Geological Survey of Iran, P. 589.
National Iranian South Oil Company, 2019. Internal Report.
Opera, A., Alizadeh, B., Sarafdokht, H., Janbaz, M., Fouladvand, R., Heidarifard, M.H., 2013. Burial history reconstruction and thermal maturity modeling for the middle cretaceous–early miocene petroleum System, southern Dezful Embayment, SW Iran. International Journal of Coal Geology 120, 1-14. https://doi.o rg/10.1016/j.coal.2013.08.008.
Peters, K.E., 1986. Guidelines for evaluating petroleum source rock using programmed pyrolysis. AAPG bulletin 70, 318-329.
Rabbani, A., Bagheri Tirtashi, R., 2010. Hydrocarbon source rock evaluation of the super giant Ahwaz oil field, SW Iran. Australian Journal of Basic and Applied Sciences 4, 673-686.
Sarı, A., Moradi, A.V., Akkaya, P., 2015. Evaluation of source rock potential, matrix effect and applicability of gas oil ratio potential factor in Paleocene–Eocene bituminous shales of Çamalan Formation, Nallıhan–Turkey. Marine and Petroleum Geology 67, 180-186. https://doi.org/10.1016/j.marpetgeo.2015.05.020.
Tissot, B., du Petrole, E.N.S., Welte, D., 1978. Petroleum formation and occurrence. A new approach to oil and gas exploration.[Book in German]. https://doi.org/10.1007/978-3-642-96446-6.
Advanced Applied Geology
Volume 13, Issue 4
December 2023
Pages 953-977

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