Brasil Round 4 Parnaíba Basin

Transcription

1 Brasil Round 4 Parnaíba Basin Adhemar Massao Fugita Block Definition Superintendency

2 Location Map Belém São Luis Fortaleza BT-PN-1 Teresina Total Area = 600,000km 2 Parnaíba Basin Palmas km

3 GENERALITIES Start of Exploration in the 50s with the National Petroleum Council - surface mapping -1 well drilled in Maranhão State To date there have been drilled: 31 Exploration wells Wildcats - 21 (1 under a Risk Contract) Stratigraphic wells - 10

4 Number of Exploration Wells Drilled by Year Blue = Wildcat wells Yellow = Stratigraphic Wells

5 Exploration History Quantitative 2D Seismic: 8,668 km Exploration wells: 31 Indicative 1km 2D/70 Km 2 1 well /19,350 km 2

6 Seismic Lines and Wells Distribution Map Petrobras

7 Structural Framework Petrobras

8 Magnetometric Map Petrobras

9 Geological Section

10 STRATIGRAPHY 7 Sequences: - Cretaceous - Urucuia, Areado, Itapecuru, Codó, Grajaú, Sardinha Fms - Jurssic - Corda, Pastos Bons, Mosquito Fms - Triassic to late Carboniferous - Sambaíba, Motuca, Pedra de Fogo and Piauí Fms - early Carboniferous/Devonian - Poti, Longá, Cabeças, Pimenteiras, Itaim Fms - Silurian - Jaicós, Tianguá and Ipu Fm - Ordovician/Cambrian Mirador Fm - late Proterozoic- Riachão Fm

11 Stratigraphic Column Petrobras

12 Geological Section

13 Geological Map Modified from DNPM

14 PETROLEUM SYSTEM Source rocks - principal = Pimenteiras Fm (Devonian-Frasnian) TOC - average 2-2.5% peak 6% Type II and III - secondary = Tianguá Fm (Silurian) and Longá Fm (Devonian-Famenian) NOTE: The Codó Fm has TOC levels up to 23%, but is immature

15 PETROLEUM SYSTEM Source and seal isopach map Pimenteiras Fm

16 PETROLEUM SYSTEM Radioactive shale isolith map Richest source rock - Pimenteiras Fm DPC&Assoc

17 PETROLEUM SYSTEM Reservoirs Parnaíba Basin Principal Devonian sands of the Cabeças Fm Secondary- Devonian sands of the Itaim Fm, Carboniferous Piaui Fm, Silurian Ipu Fm Other possibilities fractured diabases

18 Cabeças Fm sand isolith Della Fávera,1999

19 PETROLEUM SYSTEM Parnaíba Basin Seals - shales of the Longá Fm for reservoirs of the Cabeças Fm - shales of the Pimenteiras Fm for sands of the Itaim Fm - shales of the Tianguá Fm for coarse clastics of the Ipu Fm - shales and anhydrites of the Pedra de Fogo Fm for reservoirs of the Piauí Fm Diabase intrusives at various stratigraphic levels could seal different reservoirs

20 PETROLEUM SYSTEM Anhydrite(Permian) Isolith Map Possible seal for the Piauí Fm

21 PETROLEUM SYSTEM Traps Conventional structural Parnaíba Basin Associated with normal and reverse faults Related to igneous intrusives Non-conventional Basin-centered

22 PETROLEUM SYSTEM Generation Assured by the thermal effect of the igneous basics within the source rock section.generation must have taken place at the start of the Jurassic Migration -Across faults -Along diabase dykes -By direct contact between source rock and reservoir -Long distance through carrier beds and faults

23 PETROLEUM BASIN Isolith Map Igneous Basic Rocks(diabase and basalts) Maturation by the thermal effect of the intrusives

24 Maturation effect of the diabase intrusives on the Pimenteiras Fm DPC&Assoc.

25 Pimenteiras Fm Orange area %Ro Red area %Ro DPC&Assoc.

26 Petroleum System Event Chart Pimenteiras-Cabeças DPC&Assoc.

27 Block Area 12,261 km2 BT-PN-1 Migrated 2D seismic 898 km Wells drilled 2 Well 2-CP-1-MA highlight (Capinzal)

28 Block BT-PN-1

29 Block BT-PN-1 Available 2D seismic map

30 Block BT-PN-1 Available well map

31 Minimum exploration program - BT-PN-1 Exploration Period MINIMUM PROGRAM - BT-PN-1 Duration (years) 1st 4 2nd 3 3rd 2 Area Relinquishments 50 % of the original area 25 % of the original areal 25 % of the original area Work Program/ Investiments 750 km 2D seismic 1 Well 2 Wells Financial Guarantee 1st Period = USD 5,000,000

32 MAIN ATTRACTION FOR THE BLOCK Possibility of HC accumulations occurrence based upon the probable discovery of a gas field drilled by well 2-CP-1-MA(Capinzal) Associated with the presence of geological factors very favourable to HC accumulations. 32

33 2-CP-1-MA(Capinzal) Seal = diabase 1,492m-1,666m Cabeças Fm 1,666m Pimenteiras Fm 2,006m Diabase 2,050m-2,257m Itaim Fm 2,476m Gas test, 1m-4m flame, from the intervals m- diabase m- Pimenteiras Fm/diabase m- Itaim Fm (isotopic analysis of the gas indicates a maturation level of 2% Ro) Log interpretation indicates a possible untested gas zone in the Cabeças Fm

34 PARNAÍBA BASIN 2-CP-1-MA SEP ELAN 1670 GAS NET PAY 11 M PROBABLE PERMEABILITY BARRIER AT 1681 M 1690 WATER ZONE 1995 /1999M 34

35 PARNAÍBA BASIN 2-CP-1-MA SEP ELAN CORRELATION BETWEEN ACQUIRED CURVES VERSUS RECONSTRUCTED CURVES DIABASE DENSITY NEUTRON SONIC RESISTIVITY AND GAMA RAY SANDSTONES 35

36 PARNAÍBA BASIN SEP 2-CP-1-MA M - N PLOT SANDSTONE W/ GÁS 36

37 PARNAÍBA BASIN SEP 2-CP-1-MA PLOT In red= gas effect PHID - PHIN EFEITO DE GÁS 37

38 ACCUMULATION (?) OF GAS IN 2-CP-1-MA COULD BE: - A conventional or discrete type of anticlinal structure with Cabeças Fm reservoir, sealed by diabase and a defined gas/water contact - A non-conventional, continuous, basin-centered accumulation in sweet spots NOTE- this type of accumulation is responsible for 10%-15% of the total gas production in the USA

39 Conventional vs basin-centered Surdam et al.1997

40 Conventional vs basin-centered Surdam et al1997

41 Bacia do Parnaíba 2-CP-1-MA 59-RL-64 40

42 Bacia do Parnaíba 2-CP-1-MA 41

43 42

44 Basin-Centered type accumulations TIPO DIRETO TIPO INDIRETO Source Rock gas-prone oil-prone Pressure mechanism HC generation Oil cracking Abnormal pressure high/low generally low Seal relative K / capillary P lithological Top of accumulations generally Ro > 0,7% Ro > 1,3-1,4 Top of accumulations cross estratigrphic boundaries follow boundaries Migration short distance short distance Ben Law (2001) 43

45 BASEMENT OR PRE-SILURIAN STRUCTURAL CONTOURS BASED ON WELL DATA

46 PARNAÍBA BASIN Wattenberg Field Most prolific in the Denver-Julesburg Basin Discovered in 1970 produced more than 2.2MMBO and 600BCFG Basin-centered type of accumulation Petroleum Development Corporation, 2000

47 PARNAÍBA BASIN Jonah Field - Centered-basin Accumulation Green River Basin Poros 8-12% k= 3-20 microd Current Production +100MMCFGD gas column pés Fracturing needed 46

48 Distribution of silurian accumulations Appalachian Basin Basin-Centered to Hybrid to Conventional USGS-Ryder R.T.98 47

49 Graph of Typical Gas Production Tight gas sand with adequate fracturing Green River Basin Drilling and completion costs can be recovered in 2 years Wells can produce for years.

50 ATTENTION If the 2-CP-1-MA accumulation is a basin-centered type one, the reserves calculations can not be done according to the traditional method applied to conventional accumulations The geometry of the accumulation, in special, can be quite different. 49

51 NOMINATIONS FOR FUTURE ROUNDS ASTROBLEMES EAST FLANK SOUTH FLANK

52 Riachão Ring Astrobleme S 07º43 W 46º39 diametre 4.5 km

53 Riachão Ring Astrobleme

54 Serra da Cangalha Astrobleme S 08º05 W 46º51 diameter 14 km

55 Astrobleme Types Meteor Crater (Donofrio R.R.1981) Cannon P.J.2000

56 Astrobleme producing field Red Wing Creek Field Donofrio R.R.1981

57 Astrobleme producing field Viewfield Field DonofrioR.R.1981

58 The attraction of the Parnaíba Basin East Flank Transbrazilian Lineament and associated structures Shallow fields at the basin margin Immature source rock (biogenic gas)

59 Geological Section

60 Map modified from DNPM) Attraction of the South Flank Surface structural inversion Possibility to test the São Francisco Basin (proterozoic)

61 Seven Cities National Park - Piauí Cabeças Fm outcrop

62 PARNAÍBA BASIN

63 PARNAÍBA BASIN SEVEN CITIES - TURTLE

64 PARNAÍBA BASIN SEVEN CITIES FINGER OF GOD

65 SEVEN CITIES Channel

66 PARNAÍBA BASIN SEVEN CITIES Rock Art

67 SERRA DA CAPIVARA NATIONAL PARK SERRA GRANDE GROUP OUTCROP

68 Serra da Capivara - Piauí Serra Grande Group

69 Serra da Capivara National Park Piauí

70 Serra da Capivara Piauí RockArt

71 Serra da Capivara-Piauí Rock Art

72 SERRA DA CAPIVARA Rock Art

73 SERRA DAS CONFUSÕES NATIONAL PARK

74 Bacia do Parnaíba SERRA DAS CONFUSÕES LITTLE ANDES

75 SERRA DAS CONFUSÕES

76 Bacia do Parnaíba SERRA DAS CONFUSÕES PEDRA DO GUARDIÃO

77 SERRA DAS CONFUSÕES

78 Thank you for your attention