Full text loading...
-
Sedimentology of the Major W Crocker Submarine Fan System; Analogue to the Younger Productive Fans, NW Sabah Basin
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Petroleum Geoscience Conference & Exhibition 2013, Mar 2013, cp-340-00062
Abstract
The West Crocker Formation (WCF) outcrops in NW Sabah, Borneo represent a large (25000 km2), sandstone-dominated basin-floor submarine fan that was deposited in an accretionary foredeep basin complex during the Oligocene to Early Miocene period.The sedimentological analysis of the WCF outcrops has resulted in seven sedimentary facies types and five facies associations. The seven facies are categorised into three major groups: (1) sand-dominated facies (F1 to F3), comprise high- to low-density turbidites (2) debris flow-dominated facies (F4 to F6), comprises mud- and sand-dominant debris flows and mass transport deposits (MTD) and (3) mudstone dominated facies (F7) of hemipelagic settling. The five facies associations are: (1) Inner Fan Channel-Levee complex, 2) Mid-Fan Channelised Lobes,(3)Mid-Fan Non-Channelised Lobes, (4) Outer Fan Distal Lobes, (5) Mid Fan Mass Transport Complexes MTCs). A range of depositional elements are identified including channel-levee, lobes (shallow channel / channelised& non-channelised and distal lobes) and mass-transport complexes (MTCs). The four proposed laterally contiguous depositional environments for the WCF are: (1) inner fan channel-levee complex; (2) mid-fan channelised lobes; (3) mid-fan non-channelised lobes; and (4) outer fan distal lobes.The West Crocker submarine fan system is best described as a multiple-sourced, shelf-fed, Type II, low-efficiency and sand-rich system.