267 A geochemical evaluation of the West Crocker Formation - clues to deepwater source rock facies? AzLINA ANuARl, PETER ABOLINS 1 , PAUL CREVELLo 2 AND WAN HASIAH ABDULLAH 3 1PETRONAS Research and Scientific Services Sdn. Bhd. Lot 3288 & 3289, off Jalan Ayer ltam, Kawasan Institusi Bangi 43000 Kajang, Selangor Darul Ehsan, Malaysia 2Petrex Asia Sdn. Bhd. 7-15-2, Kirana, 7 Jalan Pi nang, 50450 Kuala Lumpur, Malaysia 3Department of Geology, University of Malaya 50603 Kuala Lumpur, Malaysia Paper 6 Recent exploration activity in the present day deepwater areas of offshore northwest Sabah have resulted in varied successes in the targetted turbidite sands; results ranging from dry wells to considerable oil discoveries. These mixed results have raised some issues regarding the hydrocarbon charge in a turbidite setting, particularly concerning the source rock distribution, quality and maturity (Walker, 1978). Almost all published geochemical studies to date have focussed on the shallow water (present day and ancient) areas of offshore Sabah and have discussed source facies dominated by dispersed terrigenous organic matter (Azlina Anuar, 1994; Leong et al., 1999). However, are these source facies appropriate models for deepwater depositional settings? To try to address this issue, a field study and subsequent geochemical characterisation study, of an onshore deepwater analogue - the West Crocker Formation - were carried out. The West Crocker was selected by virtue of geographic and temporal proximity to the current exploration turbidite targets. In this way, source facies variations were minimised. Furthermore, the West Crocker has been well described sedimentologically, with several turbidite elements recognised and described in the field (Crevello, 1998; Crevello, 2001). Warta Geologi, Vol. 29, No.6, Nw-Dec 2003 Warta Geologi (Newsletter of the Geological Society of Malaysia), Vol. 29, No. 6, November-December 2003 Copyright © 2017 by Geological Society of Malaysia (GSM)