PETROLEUM GEOLOGY OF THE WESTERN PART OF THE CENTRAL IRAN BASIN

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
G. Abbasi, H. Motamedi, K. Orang, A. A. Nickandish
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引用次数: 2

Abstract

Eocene extension and magmatism in Central Iran was followed by late Eocene – early Oligocene uplift, erosion, volcanism and the deposition of the continental and evaporitic sediments of the Lower Red Formation. During the late Oligocene – early Miocene, an extensional (or transtensional) phase occurred with the deposition of the limestones and marls of the Qom Formation, followed by the evaporitic deposits or mudstones of the basal part of the Upper Red Formation. Since the late Miocene, compression has resulted in regional shortening and uplift, with the deposition of the thick, clastic-dominated upper part of the Upper Red Formation and the overlying conglomeratic unit.

Between 1951 and 2016, a total of 45 exploration, appraisal and development wells were drilled across the western part of the Central Iran Basin where the Alborz, Sarajeh and Aran fields are hydrocarbon discoveries. Traps at these fields are NW-SE oriented detachment folds formed during the late Miocene – Pliocene. Porous and fractured limestones in the Qom e-member are the principal reservoir units, and are capped by evaporites or mudstones in the basal part of the Upper Red Formation. Organic-rich mudstones in the Qom e- and c-members together with shales in the Jurassic Shemshak Formation are potential source rocks.

An overview of 80 years of exploration efforts in the western part of the Central Iran Basin suggests that the main reasons for the general lack of success include drilling-associated problems, poor reservoir characteristics, lack of hydrocarbon charge, and underestimating the thickness of the overburden on top of the Qom reservoir.

伊朗中部盆地西部的石油地质
伊朗中部的始新世伸展和岩浆作用之后是始新世晚期-渐新世早期的隆起、侵蚀、火山活动以及下红组大陆和蒸发岩沉积物的沉积。在渐新世晚期-中新世早期,随着库姆组石灰岩和泥灰岩的沉积,出现了伸展(或张拉)阶段,随后是上红组基底部分的蒸发岩沉积或泥岩。自中新世晚期以来,压缩作用导致了区域缩短和隆起,沉积了上红组以碎屑为主的厚上部和上覆的砾岩单元。
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来源期刊
Journal of Petroleum Geology
Journal of Petroleum Geology 地学-地球科学综合
CiteScore
3.40
自引率
11.10%
发文量
22
审稿时长
6 months
期刊介绍: Journal of Petroleum Geology is a quarterly journal devoted to the geology of oil and natural gas. Editorial preference is given to original papers on oilfield regions of the world outside North America and on topics of general application in petroleum exploration and development operations, including geochemical and geophysical studies, basin modelling and reservoir evaluation.
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