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Geological Description for Unlocking Potential of Najmah-Sargelu Reservoir in Greater Burgan FieldNormal access

Author: B. Al-Enezi
Event name: Third EAGE WIPIC Workshop: Reservoir Management in Carbonates
Session: Poster Session / Coffee Break Day 2
Publication date: 19 November 2019
DOI: 10.3997/2214-4609.201903128
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.24Mb )
Price: € 20

The Najmah-Sargelu are regionally extensive formations extending across Kuwait. The Najmah formation lying above Sargelu limestone is a prolific source rock that has been attributed as one of the key hydrocarbon sources for most of the overlying reservoirs in South-Eastern Kuwait along with the Makhul and Kazdhumi. The Najmah formation in Burgan Field consists of limestones and mudrocks with a set of particularly rich shales at its center, which are potential targets for an unconventional shale play. Within neighboring fields to the west of Greater Burgan, permeable and pervasive fracture networks are present within the Najmah and Sargelu. The presence of these fracture networks connecting the prolific source rock source rock with competent carbonate beds, and with a thick Gotnia evaporite cap rock, form an effective hydrocarbon system that has been developed successfully in the nearby Kuwait fields. The Najhmah shale benefits from having very high TOC and reservoir pressure but has low overall net thickness and porosity that will directly affect the resource density. This play has the most potential along the northeastern part of the Burgan field where intense deformation is most likely to create a permeable and pervasive fracture network capable of delivering significant quantities of oil. This paper involves the subsurface description of two play-types (Najmha Shale and Najmah-Sargelu Fractured Limestone) and their spatial development across the Greater Burgan Field, critical review and comparison of Burgan and analogue data to establish a view of unlocking potential resources in Greater Burgan and develop analogue based views of possible recovery and productivity in the Najmah-Sargelu formation in Greater Burgan. This paper also emphasizes the possibility of exploiting the fractured Najmah-Sargelu play within Burgan and predicts where the play is most likely to be successful.

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