Myths of the NWS PESA Talk Oct 2015 NWS

Transcription

1 Myths of the NWS PESA Talk Oct 2015 NWS Dariusz Jablonski Finder Exploration Slide 1

2 What is this presentation not about 1. This is not about being personal, egos, where you come from, your credentials, experience or even how much you know 2. It is not even about data as all have access to more or less same data set Slide 2

3 What is this presentation about? 1. This is about asking questions and acting accordingly: Don t be afraid to be ridiculous and Have lots of fun!!! 2. Once you ask questions you will come up with your own personal laundry list Slide 3

4 My Laundry List 1. NWS severely tilted toward the Indian Ocean 2. NWS is a very prolific hydrocarbon system 3. You can t correlate across wide distances 4. Does the Callovian unconformity exist? 5. All hydrocarbons migrate to the top porosity 6. Majority of HCs require a structure 7. Deep water is very prospective 8. Oil is dominantly sourced from the Upper Jurassic in the Dampier Sub-basin Today's PESA Talk Slide 4

5 My Laundry List 1. NWS severely tilted toward the Indian Ocean 2. NWS is a very prolific hydrocarbon system 3. You can t correlate across wide distances 4. Does the Callovian unconformity exist? 5. All hydrocarbons migrate to the top porosity 6. Majority of HCs require a structure 7. Deep water is very prospective 8. Oil is dominantly sourced from the Upper Jurassic in the Dampier Sub-basin Today's PESA Talk Slide 5

6 NWS is severely tilted toward the Indian Ocean Water Depth Animation Slide 6

7 NWS is severely tilted toward the Indian Ocean NW Unflattened Regional Seismic Example JO at 2824m Brigadier-1 SW TWT (sec) JO JO JO Water Depth Map (m) Slide 7

8 NWS is severely tilted toward the Indian Ocean NW 40% SB flattened Regional Seismic Example JO at 2824m Brigadier-1 SW TWT (sec) JO JO JO JO Oceanic Crust Water Depth Map Slide 8

9 NWS is severely tilted toward the Indian Ocean 40% SB flattened Regional Seismic with ODP and Galahad Well Projection NW JO at 2736m ODP Wells JO at 2065m Galahad-1 JO at 1935m JO at 2824m Brigadier-1 SW TWT (sec) JO JO JO JO Oceanic Crust Water Depth Map Slide 9

10 NWS is severely tilted toward the Indian Ocean JO Oceanic Crust Lwr Triassic JO Triassic JO Kms Basement Rift Shoulder Uplift Courtesy of Ion (GeoExPro Dec, 2014) Slide 10

11 My Laundry List 1. NWS severely tilted toward the Indian Ocean 2. NWS is a very prolific hydrocarbon system 3. You can t correlate across wide distances 4. Does the Callovian unconformity exist? 5. All hydrocarbons migrate to the top porosity 6. Majority of HCs require a structure 7. Deep water is very prospective 8. Oil is dominantly sourced from the Upper Jurassic in the Dampier Sub-basin Today's PESA Talk Slide 11

12 NWS is a very Prolific Hydrocarbon System JO (Oxfordian Unconformity) Animation Slide 12

13 NWS is a very Prolific Hydrocarbon System NWS vs Alberta (Canada) Fields NWS 3000 wells Av. HC POS ~10% Alberta ~500,000 wells with virtually all encountering HCs (av. HC POS >80%) Discoveries up to 1990 Torosa Oil Sands Ichthys Jansz Gas Phoenix South-1 Pembina 12BB bbls in place (1.5BB bbls produced) Barrow Island Oil 0.355BB bbls res. Slide 13

14 NWS is a very Prolific Hydrocarbon System NWS vs Alberta (Canada) SR Characteristics Lynx-1 SR (Example of 2 SRs - in the middle of the basin) Alberta SR Example of 3 SRs Oxfordian SR Lwr Jurassic SR Signal Slide 14

15 NWS is a very Prolific Hydrocarbon System Alberta (Canada) SR Log Detection Lwr Cret 2 nd White Speckle Shale SR S Lwr Cret Fish Scale SR Bottom Line: 1. Alberta: Multiple easily identifiable SRs on logs 2. NWS: Sporadic, low (diluted?) TOC SR (except Mungaroo coals) S S Oil-prone Source Rock Gas-prone Source Rock S Lwr Cret Mannville SR Triassic Doig SR S 20m S Base Triassic Montney SR Slide 15

16 My Laundry List 1. NWS severely tilted toward the Indian Ocean 2. NWS is a very prolific hydrocarbon system 3. You can t correlate across wide distances 4. Does the Callovian unconformity exist? 5. All hydrocarbons migrate to the top porosity 6. Majority of HCs require a structure 7. Deep water is very prospective 8. Oil is dominantly sourced from the Upper Jurassic in the Dampier Sub-basin Today's PESA Talk Slide 16

17 Can t Correlate across Significant Distances Can t correlate across Grabens within the Same Tectonic Trend (1980-ties) 26kms Low JO Depth High SE NW Slide 17

18 Can t Correlate across Significant Distances Can t correlate across Tectonic Trends (1990-ties) ~70kms Low JO Depth High N S Slide 18

19 Can t Correlate across Significant Distances Can t correlate across Basins (2000,s) Flattened on JO 1,000kms Low JO Depth High Slide 19

20 Can t Correlate across Significant Distances 1. We should understand stratigraphy by now 2. But often we don t as we mix lithostratigraphy with chronostratigraphy 3. Why? Because most of us don t use the sequence stratigraphic method Slide 20

21 My Laundry List 1. NWS severely tilted toward the Indian Ocean 2. NWS is a very prolific hydrocarbon system 3. You can t correlate across wide distances 4. Does the Callovian unconformity exist? 5. All hydrocarbons migrate to the top porosity 6. Majority of HCs require a structure 7. Deep water is very prospective 8. Oil is dominantly sourced from the Upper Jurassic in the Dampier Sub-basin Today's PESA Talk Slide 21

22 Does the Callovian Unconformity Exist? Well & Seismic Example Jablonski (1997) Slide 22

23 Does the Callovian Unconformity Exist? Well & Seismic Example Jablonski & Saitta (2004) Slide 23

24 Does the Callovian Unconformity Exist 3000kms NW of Dampier Sub-basin? JO Laminaria JC Plover Slide 24

25 Does the Callovian Unconformity Exist? JO Event in the Core Persephone-1 JO at 3136mRT (erosional, no Calypso) Fresh undisturbed sst (Legendre) Persephone-1 WCR (mod., 2007) JK/JT/KV at mRT JO at 3136mRT Slide 25

26 Does the Callovian Unconformity Exist? Rift Mechanism Pre-Rift (pre-jc) (uniform subsidence) Syn-Rift (JC) (continental stretch -> accelerated nonuniform subsidence) Break-up Unconformity Phase (JO) (Uplift as Oceanic Crust Break through thinned continental crust) Jablonski & Saitta (2004) Slide 26

27 Does the Callovian Unconformity Exist? Rift Mechanism -> Better Understanding of Plate Tectonics SAUDI ARABIA MESOTETHYS OCEAN TRIPPLE JUNCTIONS LHASA/ WEST BURMA SIKULEH/ WEST SUMTRA PM WS CS GREATER INDIA B-D H AP V SH M NP C PT G SP AUSTRALIA PANTHALASSA GREATER LORD HOWE RISE ENVIRONMENTS OCEANIC CRUST, DEEP DISTAL SHELF/BASIN PRESENT DAY COASTLINE/ BLOCK BOUNDARY ACTIVE SPREADING RIDGE/VILCANISM FAILED SPREADING RIDGE/SPORADIC VOLCANISM EXTINCTSPREADING RIDGE ANTARCTICA COMPRESSION/COLLISION SEDIMENT INPUT VOLCANIC SEDIMENTS NZ & SURRONDS My (JC to JO) Callovian Plate Reconstruction CONTINENTAL MARGIN PROXIMAL SHELF DELTAIC- NEARSHORE- SHELF LIMESTONE NEARSHORE- SHELF EVAPORITES NON-MARINE NON-DEPOSITION UPLAND,UPLIFT,SIGNIFICANT EROSION,MOUNTAINS Slide 27

28 Does the Callovian Unconformity Exist? Rift Mechanism -> Better Understanding of Paleogeography Slide 28

29 Does the Callovian Unconformity Exist? 1. Callovian Unconformity : Callovian-Oxfordian section is controlled by mega-tectonics (inter-continental plate interactions and no age diachronism is observed) 2 tectonic events Collapse (stretch/jc transgression) followed by uplift (onset of oceanic crust formation: JO composite seq. boundary) Contrary to most break-up models that predict uplift first then subsidence Seismic and well recognition criteria (JC-no angularity; JO-angularity on basin margin, no angularity in the basin) Synrift is likely to be clst dominated and hence no sst (or limited) in grabens during tectonism Sst disposition (basin floor fans) in non-exposed areas as a result of uplift at JO 2. Stretch followed by uplift is repeated many times on the NWS (Jablonski & Saitta, 2004) 3. There is no such thing as a Callovian Unconformity JO Uplift JC Transgression D. Jablonski (1997) Slide 29

30 My Laundry List 1. NWS severely tilted toward the Indian Ocean 2. NWS is a very prolific hydrocarbon system 3. You can t correlate across wide distances 4. Does the Callovian unconformity exist? 5. All hydrocarbons migrate to the top porosity 6. Majority of HCs require a structure 7. Deep water is very prospective 8. Oil is dominantly sourced from the Upper Jurassic in the Dampier Sub-basin (WABS 4, Jablonski et al.; 2013) Today's PESA Talk Slide 30

31 Final Thought (one of the most overused Quotes). doing the same thing.and expecting different results Benjamin Franklin? (Albert Einstein repeated that later) Slide 31

32 Myths of the NWS PESA, Oct 2015 Abbreviated Presentation is posted on finderexp.com website (under reports tab) Slide 32