ANGOLA OFFSHORE LICENSING 2007 BLOCK 46

Transcription

1 AGOLA OFFHOR LICIG 2007 BLOCK 46 DATA BA AVAILABILITY Figure 1 shows the seismic data available on Block 46. Fig. 1 Commercial 2D surveys: esterngeco: 794 km. GX Technology: 116 km. Commercial 3D surveys: esterngeco: km 2. There are no wells drilled on the block. Block 46 RGIOAL GOLOGY Block 46 is located in the ultra-deepwater offshore Lower Congo Basin, south of Congo River, some 500 km northwest of Luanda and 200 km west of oyo onshore facilities. The water depth in the block is around 2,500 meters. The block is positioned on the outer slope of the basin proximal to the boundary of continental and oceanic crust. Figure 2 illustrates the geological structure and stratigraphy of the block as a geoseismic section. The block predominantly encompasses a Tertiary basin. alt diapirism with mini-basins and presence of meandering channels and lobes in the Miocene dominate the block. Postsalt source potential in Upper Cretaceous Iabe Formation is recognized throughout the block. alt-cored Miocene symmetric fold belt sequences up to 3 km thick provide hydrocarbon traps. Compressional regime tectonics in the block (Figure 3) is less pronounced relative to the blocks in the south. This is attributed to the relative availability of accommodation space during the stretch of the margin within the region of the block. This space availability on the margin gradually reduces further south of the block where it leads to the development of a pronounced salt escarpment and sub-thrust truncation. Migration conduits for oil generated from mature Postsalt source rocks would be along the weak planes of the salt diapir walls and subtle faults. Fig. 2 ABYAL PLAI OUTR FOLD BLT ALT CAOPY COMPRIOAL XTIOAL ZO ZO Marte-1 Jupiter-1 ZO Block46 Block31 Block Outer Basement High 10.0 Pliocene U-M. Miocene L. Miocene U. Cretaceous Paleogene Albian Aptian alt Oceanic Crust Basement (Intermediate and Continental Crust) 10 km

2 AGOLA OFFHOR LICIG 2007 BLOCK 46 Fig. 3 PLAY AD PROPCTIVITY Miocene stacked channels over salt diapir crest Principal plays are recognized in Miocene and Oligocene channel/lobe systems with potential large entrapped hydrocarbon columns in the block s outer fold belt and abyssal plain. uch Tertiary channels/lobes host sand reservoirs in the adjacent deepwater blocks of the Lower Congo Basin, where known reservoirs possess excellent porosity, permeability, and flow rates. To date, major discoveries are known at several different levels in the Miocene and in the Oligocene. Fig. 4 Miocene stacked channels over salt diapir crest Oligocene channel Amplitude in Miocene channel complex on salt flank umerous leads are recognized on the block in Oligo- /lobe complexes associated with salt diapir crests and flanks. Throughout the area of the block, geophysical attributes such as bright amplitudes, AVO anomalies and flat spots indicating oil and gas contacts are common in the Miocene section and to a lesser extent in the Oligocene. These are illustrated in the adjoining seismic panels Miocene channels Fig. 5 Fig. 6? Oligocene channel complex on salt diapir crest alt flank channel complex with flat spots Channel and lobe geometry in Miocene and Oligocene leads is well identified in salt mini-basins within the block. xcellent trap configuration is observed in stacked and isolated channel complexes at several different levels seen in four-way drape closures over salt diapir crests and in stratigraphic traps on salt flanks (Figure 3). Many of these features exhibit flat events indicating oil and gas contacts (red arrows, Figures 4 to 6). Flat events are particularly well seen in salt flank traps where stacked flat spots can indicate multilayer reservoir complexes (Figure 5). The channel/lobe play extends into the abyssal plain in front of the Miocene fold belt. Here, isolated channels display sediment depositional mounding with compactional relief (Figure 6). In summary, the block has potential in the prolific Tertiary channel/lobe play system in the Miocene and possibly in the Oligocene that have similarities to successful plays in the adjacent blocks. Maturity modeling studies (1D and 3D) conducted in the block suggest that there has been hydrocarbon generation from Postsalt sources and pathways for migration have been identified. and lobe complex Migration pathway with amplitude anomalies Crestal amplitude Channel complexes on abyssal plain showing compactional relief

3 AGOLA OFFHOR LICIG 2007 BLOCK 47 DATA BA AVAILABILITY Figure 1 shows the seismic data available on Block 47. Fig. 1 Commercial 2D surveys: esterngeco: 936 km. Block 47 GX Technology: 159 km. Commercial 3D surveys: esterngeco: km There are no wells drilled on the block. RGIOAL GOLOGY Block 47 is located in the ultra-deepwater offshore Lower Congo Basin, south of Congo River, some 450 km northwest of Luanda and 200 km west of oyo onshore facilities. The water depth in the block is around 2,500 meters. The block is positioned on the outer slope of the basin proximal to the boundary of continental and oceanic crust. Figure 2 illustrates the geological structure and stratigraphy of the block as a geoseismic section. The block predominantly encompasses a Tertiary basin. alt diapirism with mini-basins and presence of meandering channels and lobes in the Miocene dominate the block. Postsalt source potential in Upper Cretaceous Iabe Formation is recognized throughout the block. alt-cored Miocene symmetric fold belt sequences up to 3 km thick provide hydrocarbon traps. Compressional regime tectonics in the block (Figure 3) is less pronounced relative to the blocks in the south. This is attributed to the availability of accommodation space during the stretch of the margin within the region of the block. This space availability on the margin gradually reduces further south of the block where it leads to the development of a pronounced escarpment and sub-thrust truncation. The block has many similarities to its northern counterpart (Block 46), but displays the ocean bottom escarpment more distinctly (Figures 4 and 5). Migration conduits for oil generated from mature Postsalt source rocks would be along the weak planes of the salt diapir walls and subtle faults. ABYAL OUTR FOLD ALT CAOPY COMPRIOAL XTIOAL ZO PLAI BLT ZO Hebe-1 ZO Tchiumba-1 Block 47 Block 31 Block 15 Blk Outer Basement High Pliocene U-M. Miocene L. Miocene U. Cretaceous Paleogene Albian Aptian alt Oceanic Crust Basement (Intermediate and Continental Crust) 10 km

4 AGOLA OFFHOR LICIG 2007 BLOCK 47 Fig. 3 PLAY AD PROPCTIVITY tacked crestal amplitude anomalies in Oligo- alt flank channels with flat spots umerous leads are recognized on the block in Oligo- /lobe complexes associated with salt diapir crests and flanks. Throughout the area of the block, geophysical attributes such as bright amplitudes, AVO anomalies and flat spots indicating oil and gas contacts are common in the Miocene section and to a lesser extent in the Oligocene. These are illustrated in the adjoining seismic panels Fig. 4 Crestal amplitude in channel complex with flat event with crestal anomalies Oligocene channel with crestal and flat spot Channel and lobe geometry in Miocene and Oligocene leads is well identified in salt mini-basins within the block. xcellent trap configuration is observed in stacked and isolated channel complexes at several different levels seen in four-way drape closures over salt diapir crests and in stratigraphic traps on salt flanks (Figure 3). Many of these features exhibit flat events indicating oil and gas contacts (red arrows, Figures 3 to 6). Flat events are particularly well seen in salt flank traps where stacked flat spots can indicate multilayer reservoir complexes (Figure 3). Figures 3 and 4 also show multiple stacked crestal anomalies over salt diapirs. Figure 5 illustrates a possible faulted trap caused by salt thrusting. The channel/lobe play extends into the abyssal plain in front of the Miocene fold belt. Here, isolated channels display sediment depositional mounding with compactional relief (Figure 6). The presence of flat spots indicates that effective migration has taken place in this domain. Fig. 5 tratigraphic trap in lobe facies In summary, the block has potential in the prolific Tertiary channel/lobe play system in the Miocene and possibly in the Oligocene that have similarities to successful plays in the adjacent blocks. Maturity modeling studies (1D and 3D) conducted in the block suggest that there has been hydrocarbon generation from Postsalt sources and pathways for migration have been identified. Fig. 6 Miocene channel complex in upthrown fault trap Crestal amplitude Miocene stacked channels over salt diapir crest with flat spots Channel and lobe complex Oligocene channel complex

5 AGOLA OFFHOR LICIG 2007 BLOCK 48 DATA BA AVAILABILITY Figure 1 shows the seismic data available on Block 48. Fig. 1 JUO Commercial 2D surveys: Block 48 PALA esterngeco: 1443 km GX Technology: 278 km. Commercial 3D surveys: esterngeco: km 2. There are no wells drilled on the block RGIOAL GOLOGY Block 48 is located in the ultra deepwater offshore Lower Congo Basin, south of Congo River, some 400 km northwest of Luanda and 200 km west of oyo onshore facilities. The water depth in the block is around 2,500 meters. The block is positioned on the outer slope of the basin proximal to the boundary of continental and oceanic crust. Figure 2 illustrates the geological structure and stratigraphy of the block as a geoseismic section. The block predominantly encompasses a Tertiary basin. alt diapirism with mini basins and presence of meandering channels and lobes in Miocene dominate the block. Postsalt source potential in Upper Cretaceous Iabe Formation is recognized throughout the block. alt-cored Miocene symmetric fold belt sequences up to 3 km thick provide hydrocarbon traps. Compressional regime tectonics are prominent relative to the blocks further north. This is attributed to the reduced space availability on the stretched margin. It leads to the development of more distinct mini-basin development and a pronounced salt escarpment and sub-thrust truncation (Figure 6). Migration conduits for oil generated migration from mature Postsalt source rocks would be along the weak planes of the salt diapir walls and subtle faults. ABYAL PLAI OUTR FOLD ALT CAOPY COMPRIOAL XTIOAL ZO BLT ZO ZO Bengo-1 Block 48 Block 32 Block 31 Block 16 Bengo Outer Basement High Pliocene U-M. Miocene L. Miocene U. Cretaceous Paleogene Albian Aptian alt Oceanic Crust Basement (Intermediate and Continental Crust) 10 km

6 AGOLA OFFHOR LICIG 2007 BLOCK 48 Fig. 3 PLAY AD PROPCTIVITY over salt crest over salt diapir crest Principal plays are recognized in Miocene and Oligocene channel/lobe systems with potential large entrapped hydrocarbon columns in the block s outer fold belt and abyssal plain. uch Tertiary channels/lobes host sand reservoirs in the adjacent deepwater blocks of the Lower Congo Basin, where known reservoirs possess excellent porosity, permeability, and flow rates. To date, major discoveries are known at several different levels in the Miocene and in the Oligocene. Fig. 4 in salt mini basin umerous leads are recognized on the block in Oligo-/lobe complexes associated with salt diapir crests and flanks. Throughout the area of the block, geophysical attributes such as bright amplitudes, AVO anomalies and flat spots indicating oil and gas contacts are common in the Miocene section and to a lesser extent in the Oligocene. These are illustrated in the adjoining seismic panels Fig. 5 complexes over salt diapir crests Channel and lobe geometry in Miocene and Oligocene leads is well identified in salt mini-basins within the block. xcellent trap configuration is observed in stacked and isolated channel complexes at several different levels seen in four-way drape closures over salt diapir crests and in stratigraphic traps on salt flanks (Figures 3 and 4). Many of these features exhibit flat events indicating oil and gas contacts (red arrows, Figures 3 to 6). Flat events are particularly well seen in channels draped over salt diapirs and associated with gas hydrate traps (Figure 5). The channel/lobe play extends into the abyssal plain in front of and beneath the salt thrust. ub-thrust truncation traps are recognized below the salt (Figure 6). Away from the salt isolated channels display sediment depositional mounding with compactional relief (Figure 6). Fig. 6 in sub-hydrate traps with flat event In summary, the block has potential in the prolific Tertiary channel/lobe play system in the Miocene and possibly in the Oligocene that have similarities to successful plays in the adjacent blocks. Maturity modeling studies (1D and 3D) conducted in the block suggest that there has been hydrocarbon generation from Postsalt sources and pathways for migration have been identified. Crestal above salt thrust anomalies Channels on abyssal plain with compactional relief alt flank channel Truncation traps beneath salt thrust with amplitude anomalies