ISPRS IGU CIG Table of contents Authors index Search Exit SIPT UCI ACSG Table des matières Index des auteurs Recherches Sortir USE OF AIRSAR / JERS-1 SAR DATASETS IN GEOLOGIC / STRUCTURAL MAPPING AT THE NORTHERN NEGROS GEOTHERMAL PROJECT (NNGP), NEGROS OCCIDENTAL, PHILIPPINES R. A. Camit, L.F. Bayrante, C.C. Panem, O.C. Bien and J.A. Espiridion PNOC Energy Development Corporation, Merritt Road, Fort Bonifacio, Metro Manila 1201, Philippines [email protected] Commission IV, WG IV/7 KEYWORDS: Airborne SAR, Topographic SAR, Polarimetric SAR, DEM, aerial photography, high resolution, hillshading ABSTRACT: A remote sensing study of the Northern Negros Geothermal Project (NNGP) was conducted using Airborne Synthetic Aperture Radar (AIRSAR) AND JERS-1 SAR images. A digital elevation model (DEM) was generated from the topographic SAR (TOPSAR) data sets where various hillshading maps were extracted to emphasize the general geology and the structural configuration of the study area. Due to the high resolution of the imagery, geologic mapping interpretations were done to refine the traditional and existing aerial photography interpretations including the volcanic history and its implication to the project. The over-all result of this study have dealt with (1) the delineation of the semi-detailed geology at NNGP, thereby, giving way to the reinterpretation of the volcanic history of Canlaon volcano; (2) refinement of the structural map of Panem and Leynes (1996) with the establishment of chronological order of fault events where NW, WNW and ENE predominates the field; (3) delineation of new structural targets at Pataan area (e.g. Mambucal-B and -C, Asia-C, Asia Splay-A, -B, -C and -D, Catugasan-B Splay, Catugasan-C and -D, Kinabkaban-B, Kinabkaban-C and Pataan-C Splay); (4) confirmation of surface and subsurface interception of Talave Formation (rather than Caliling Formation) with findings of PNOC-EDC (2001); and (5) singling out of Hardin Sang Balo (rather than Tubidiao crater / collapse and Saray dome / collapse) as the probable heat source being tapped by the Pataan sector of NNGP. 1.0 INTRODUCTION The study area is geographically bounded by Panay Island to the northwest, by Cebu Island to the west and structurally 11° P N H I NORTHERN NEGROS bounded by the Negros Trench to the southwest (Fig. 1). The E L G I LEYTE RO P H S P G I U T N GEOTHERMAL PROJECT R O E R E T PNOC Energy Development Corporation (PNOC-EDC) drilled N N A C P W H H LA A IL P . F A 12 exploration and delineation wells (e.g. MC-1, MC-2, HG- U H L C T N E Mt.Silay SULU R H T C 1D, CT-1D, PT-1D, PT-2D, PT-3D, PT-4D, PT-5D, PT-6D, N U SEA SUL E R T PT-7D and PT-1RD) within the study area (Fig. 2). Wells SELEBES SEA Mt. Mandalagan N I S PT-7D and PT-1RD are yet fully tested while drilling of PT-8D A B C Mt. Canlaon R is still ongoing as of this writing. The wells are distributed A U N C A I B Y within the Mambucal, Hagdan, Catugasan and Pataan sectors, A 10° N E S A I C V C respectively, of the Northern Negros Geothermal Project L Razor Back O V Mountains (NNGP). PNOC-EDC intends to develop the Northern Negros NEGROS Geothermal Project with an aggregate capacity of 40MWe. BOHOL S N O R E G G E This study is the result of integrating available remote sensing N R Mt. Guinsayawan SO. NEGROS (Palinpinon) data (e.g. airborne synthetic aperture radar of NASA-JPL and O GEOTHERMAL FIELD S JERS-1 synthetic aperture radar of ERSDAC) with the T Mt. Talines 9° R L E G E N D: available geographic information system (GIS) database of E Cuernos de Negros N Trench C NNGP. SOUTHERN NEGROS H GEOTHERMAL FIELD Volcanic center Geothermal project The interpretation of AIRSAR imagery for geologic and 123° 124° structural mapping applications, however, was limited to the Figure 1. Location Map of the Northern Negros Geothermal project site at the northwestern sector of Mt. Canlaon (Camit et Project and the Negros volcanic arc. The Southern al., 2000). Thus, to compensate for the lack of data in the other Negros Geothermal Field is located at the southern sectors, a three-strip mosaic of processed Topographic side of the island. Synthetic Aperture (TOPSAR) data sets at 20-m contour interval were utilized to map geologic units. In addition, confirmation of said geologic units was likewise observed on four rock samples from wells and surface outcrops (Lubas, JERS-1 SAR imagery from ERSDAC. The relative age of each 2001). unit was based on superposition relationships, flow morphology, degree of dissection, vent source, relief and The existing reports on the geology, volcanology and textural differences. The paleontologic dates were derived from stratigraphy of the area have been freely consulted and used Symposium on Geospatial Theory, Processing and Applications, Symposium sur la théorie, les traitements et les applications des données Géospatiales, Ottawa 2002 Taal Lake CT-1D M LUZON T A R N Iriga SOUTH E IL N A C V Mayon Geothermal Block H o lc a CHINA n Boundary PT-6D ic H z o Bulusan C n O PHILIPPINE N e l E d SEA o e R f r T P v N h o SEA i l A l. c PT-1D W a a r n A c i L c A r P PT-2D P North Palawan NNGP o c k h Microcontinent s H Study i PT-3D E a l C n i G Area R d p N N C PT-5D PANAY A I A R m p L R S A C I e E E A i Park l n B N a M T n U A e g C O Visayan e Boundary L o O T f PALAWAN V PT-4D Basin P r S h e i O l . n R CEBU a n G c d E BOHOL h N H 10° N a e l m g NEGROS a r b o e r s a SULU SEA T A r HG-1D rench c C R A IC C H N o V A t o C a C l b c MINDANAO N E L a E G O a R V t n N o T i c A s L z E y U o s L M n t e U e m S o Figure 2. Location of NNGP wells at Mambucal, ( f ? ) P D os a Hagdan, Catugasan and Pataan sectors showing si bl v e a bu o rrie d trench g geothermal block and Natural park boundaries. u T lf - a la GE W Mambucal wells MC-1 and MC-2 are located ID C e u R R V C Buddajo A s d R A t o A IN G l R R S AN S c E a T BA O i B n NW of Pataan (PT) wells. OU C C M a d R A i R n c A A Z g R - g E IC LU z e T N o U A SU ih O LC O- SULAWESI SEA e n VO E e N OR o B f TH S OR a N n g i h e when applicable to synthesize the geology and stratigraphy 0 300 A r c within the project (Melendres, 1975; Ferrer, 1979; BMGS, KM 1982; Umbal and Arboleda, 1987; Pornuevo, 1988; Umbal and Arboleda, 1988; Pamatian et al., 1992; Catane, 1994; von 120° 125° Biedersee and Pichler, 1995; PNOC-EDC, 1998; Martinez- Figure 3. Distribution of Active and Inactive Volcanoes Villegas, 1999). and the Different Tectonic Features of the Philippines(Hamilton, 1979). This study presents: (1) the general geology, structural lineaments and proposed stratigraphy within the Northern Ferrer AGE (1979) BMGS Pamatian et al. PNOC-EDC Martinez-Villegas This Study Negros Geothermal Project (NNGP) and (2) a reinterpretation Melendres (1981) (1992) (1998) (1999) (2001) (1975) Quaternary of the volcanic history of the Canlaon volcano. This study was Alluvium HOLOCENE Alluvium Pyroclastics based on interpretations made mainly from Topographic & Volcanics Sagay flow Volcanics Caliling Canlaon Fm. PLEISTOCENE Volcanics. Synthetic Aperture Radar (TOPSAR) and JERS-1 SAR (Cf) (CnV) Carcar (CnV) (Cf) Caliling Caliling Formation Caliling Canlaon Volcanics Canlaon Formation (Cf) Formation imageries and synthesis of earlier geological, petrological and Fm. Caliling Limestone Volcanics Canlaon Hardin Volcanics HnV) Volcanics Hardin Canlaon Volcanics (CnV) Volcanics Canlaon paleontological studies. Talav e PLIOCENE Paton-an Paton-an Caliling Formation Formation Fm. (Cf) Fm. Talave Fm. (Tf) (Tf) ? ? Talave Limestone LATE Nalikban Conglomerate Talave Fm . Macasilao Fm. Talave MIDDLE Paghumayan Shale Paghumayan Fm. Formation 2.0 METHODOLOGY MIOCENE Ania Conglomerate Talave Tigbao Fm. (Tf) EARLY Odeong Formation Macasilao Formation ? F Formation Basak ? (Tf) Escalante Formation Formation (Bf) The C-DEM file was mainly used in this study where it was OLIGOCENE Escalante ? Formation Budlasan Budlasan Budlasan Volcanics Volcanics (?) Volcanics (?) converted to physical parameters, generating the lambertian (Blv) Basement (Blv) (Blv) ? ? Complex ? (shaded relief) surface and extraction of the polarimetric LATE (?) Isio MIDDLE Limestone Basak information such as the aspect and slope that was done using EARLY Fm. Basak Basak ? EOCENE ? (Bf) Formation Formation (Bf) the topographic modeling option of ENVI 3.2. Final processing PALEOCENE Basak Dacite Buried Formation (Bf) and interpretation of the topographic data are done through CRETACEOUS ILWIS 2.1. An attempt to delineate the general geology, Table 1.