A. Ayub

University of the Punjab

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Mazlan Madon

University of Malaya

Y. Azhar

Mazlan Hj Madon

I. Ahmad Zamzamie

D.S. Amin Suyitno

A.B. Azwa Jannah

B. Khairul Amri

S. M Najmi

Siti Fatimah Jabbar

Petronas (Malaysia)

Mohamed A. Hamdan

Cairo University

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Petronas (Malaysia)

University of Malaya

National Cancer Council Malaysia

University of Oxford

Cairo University

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Fractured Basement Play in the Malay Basin: Play Concept and Seismic Recognition

Mazlan Hj Madon J. Liu A. Ayub Mohamed A. Hamdan Y. Azhar

This paper reviews our current understanding of basement play in the Malay basin, offshore Peninsular Malaysia. Of more than the fifty basement penetrations, most were secondary drilling objectives. The wells revealed a variety of lithologies in the pre-Tertiary basement, including igneous, metamorphic and sedimentary rocks. The first basement oil discovery was made in the Anding area in the southwestern part of the basin. This has been used as the basis of a basement play concept in further exploration. In this study, a basin-wide seismic interpretation was carried out to identify and rank prospective areas for fractured basement play. The use of high-quality 3D seismic has enabled the recognition of potential fractured zones in the basement. Seismic recognition of fractures is a key factor in finding new prospects in fractured basement. Based on detailed mapping, potential areas of fractured basement reservoirs have been identified for further analysis.

Basement

Lithology

10.3997/2214-4609.201526192

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The NNG Discovery: A New Oil Play in the Pre-Cycle I Basement, Offshore Sarawak

Siti Fatimah Jabbar D.S. Amin Suyitno A.B. Azwa Jannah B. Khairul Amri J. Basiron

Nuang-1 was drilled in 2015 as exploration wildcat by PETRONAS in Sarawak Basin. The well is located in the western part of the Tatau Half Graben Sub-Province, in the Open Block SK304B (Figure 1). The Tatau Half Graben Sub-Province has been neglected due to high concentrations of carbon dioxide (CO2) and nitrogen (N2). For instance, H2.2X encountered 50% CO2 and 30% of N2 (M.B. Idris, 1992).

Basement

Horst and graben

10.3997/2214-4609.201526163

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Structural Evolution of the NW Sabah Deepwater Fold-and-Thrust Belt and Its Implications for Hydrocarbon Prospectivity

Mazlan Madon J. Norazlina A. Ayub M. Nor Kartini Suriati S. M Najmi

Summary Analysis of 3D seismic data across the NW Sabah deepwater fold-thrust belt (DWFTB) has given further insight into its kinematic evolution. The DWFTB may be viewed as the deformed sedimentary fill of the Sabah Trough foreland basin. Deformation along the margin appears to have been diachronous, increasing northwards. Progressive deformation of the initially flat-lying Sabah Trough sedimentary wedge produced a series of fault-propagation folds. Deformation involved mainly forward/seaward-breaking thrusts, while landward-verging backthrusts in the north resulted in complex interference fold-thrust structures. The kinematic evolution comprises a ‘constructive’ and a ‘destructive’ phase. New or reactivated faults formed during the latter phase increase the risk of seal breach and the re-migration of hydrocarbons from earlierformed traps. This late stage structural modification in the northern part of the DWFTB may explain the predominantly gas accummulations to the north.

Anticline

Trough (economics)

Diachronous

Décollement

Thrust fault

10.3997/2214-4609.201526140

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