Seismic geomorphology and stratigraphic trap analyses of the Lower Cretaceous siliciclastic reservoir in the Kopeh Dagh-Amu Darya Basin

Gholamreza Hosseinyar,Iraj Abdollahie Fard,Asadollah Mahboubi,Reza Moussavi-Harami,Rooholah Noemani Rad

doi:10.1007/s12182-019-0347-1

Gholamreza Hosseinyar, Iraj Abdollahie Fard + Show 3 more

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https://doi.org/10.1007/s12182-019-0347-1

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Abstract

Lower Cretaceous Shurijeh–Shatlyk Formations host some of the main reservoirs in the Kopeh Dagh-Amu Darya Basin. Exploration in this area so far has focused on the development of structural traps, but recognition of stratigraphic traps in this area is of increasing importance. Integration of 3D seismic data with borehole data from thirteen wells and five outcrop sections was used to identify potential reservoir intervals and survey the hydrocarbon trap types in the East Kopeh Dagh Foldbelt (NE Iran). Analyses of horizontal slices indicated that the lower Shurijeh was deposited in a braided fluvial system. Generally, three types of channel were identified in the lower Shurijeh Formation: type 1, which is low-sinuosity channels interpreted to be filled with non-reservoir fine-grained facies; type 2, which is a moderately sinuous sand-filled channel with good prospectively; and type 3, which is narrow, high sinuosity channel filled with fine-grained sediments. Results indicate that upper Shurijeh–Shatlyk Formations were deposited in fluvial to delta and shallow marine environments. The identified delta forms the second reservoir zone in the Khangiran Field. Study of the stratigraphic aspects of the Shurijeh succession indicates that both lower and upper Shurijeh reservoirs are stratigraphic reservoir traps that improved during folding.

Highlights

The Kopeh Dagh-Amu Darya Basin (KDADB) is a large and producing world-class hydrocarbon province (Fig. 1a, Kryuchkov 1996; Ulmishek 2004; Brunet et al 2017)
The main objective of this study is to investigate the stratigraphic aspects of the Lower Cretaceous Shurijeh-Shatlyk reservoirs of the KDADB, focusing on the eastern Kopeh Dagh Foldbelt
+ve 1.5 km Seismic geomorphological analyses indicate that the palaeo-flow direction in the Khangiran Field was from the south-southwest toward the northeast, where it turned to the north-northwest downstream

Summary

Introduction

The Kopeh Dagh-Amu Darya Basin (KDADB) is a large and producing world-class hydrocarbon province (Fig. 1a, Kryuchkov 1996; Ulmishek 2004; Brunet et al 2017). The KDADB is bounded on the north side by the Kyzylkum high with Paleozoic metamorphic and igneous rocks To the southeast, it adjoins the Afghan-Tajik Basin which was connected to the KDADB from the Early Mesozoic until Miocene times (Ulmishek 2004). The South Caspian Basin forms the western boundary of the basin To the south, it is bounded by the Palaeo-Tethys suture zone and Bande Turkestan Foldbelt (Fig. 1). The Palaeo-Tethys suture zone occluded on the Cimmerian oceanic closure between Eurasia with Iran and Afghan blocks. It separates the Neo-Tethys Ocean from the KDADB (Robert et al 2014; Siehl 2015)

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