Print this pageSeismic Geomorphology of Mid-Oligocene to Miocene Carbonate Buildups, Offshore Madura, Indonesia: Landforms, Depositional Environments and Basin Fill Analysis
Henry Posamentier1, Priscilla Laurin2, Alex
Warmath2, and Andrew Mehlhop1
1 Anadarko Canada Corporation, Calgary, AB
2 Anadarko Petroleum Corporation, The Woodlands, TX
A variety of carbonate landscapes have been imaged on 3D seismic data. Carbonate buildups including small patch reefs, carbonate bank with outliers, and tide influenced elongate large patch reefs/ mini platforms are observed within the Kujung 2, Kujung 1 and Wonocolo Formations. Clastic input characterized by low-angle clinoforms prograding from the north-northwest and ubiquitous polygonal fracturing occurred between deposition of the Kujung 1 and the Wonocolo Formations.
The small patch-reef buildups of the Kujung 2 range in size from less than 120 m up to 500 m diameter. Across the platform these buildups are closely spaced with less than 100 m separating isolated buildups. Each buildup is circular in plan view, with vertical relief of approximately 25-40 m.
Larger-scale patch reefs of the Kujung 1 form a northwest-southeast trending carbonate bank of coalescing patch reefs. Individual build-ups within the platform range from 600 m to 2 km in diameter and from 200-300 m in thickness. Large scale build-ups form the north of the carbonate bank and can be up to 400m thick with diameters from 1-10 km. The Kujung 1 reefs are circular to elliptical with anastamosing channels 200 m deep and 650 m wide trending normal to the carbonate bank.
The Woncolo carbonate buildups generally are larger than the Kujung buildups and are characterized by internal clinoform architecture. These buildups are circular to elliptical and range in size from 4-10 km wide, and up to 20 km in length. They are separated from each other by 1.2-2.5 km wide tidal channels.
AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005