GEOLOGICAL SOCIETY OF THE PHILIPPINES
A Submarine Fan Model for the Sigaboy Formation,
Davao Oriental: Implications to the Reservoir Potential
of Turbidite Deposits in the Agusan-Davao Basin
Karlo L. Queano
Mines and Geosciences Bureau (Central Office)
North Avenue, Diliman, Quezon City 1104
The Sigaboy Formation outcropping in Pujada Peninsula, Davao Oriental consists of submarine channelized and unchannelized deposits laid down by low and high density turbidity currents. This formation is derived from an ophiolite suite, associated sediment carapace and metamorphic rocks and is associated with volcanism based on the tuffaceous character of some of the deposits. Facies defined in these rocks studied from Sitio Talisay in the north to Barangay Lavigan in the south points to a possible submarine fan model for the formation.
The stacking pattern of the succession in the studied sector of the Sigaboy Formation formed vertical and lateral continuity of sandy and gravelly facies whose possible equivalence in the adjacent Agusan-Davao Basin could attract explorers to consider them as potential reservoirs. However, porosity studies of the different facies of the turbidite system from various stratigraphic intervals clearly show that porosity is very low. This is due to the unstable mineralogy, diagenesis, poor sorting and the unfavorable geologic setting of the Sigaboy Formation.
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