The Maule Field: An Economic Small Field Development

Transcription

1 AUSTRALIA ARGENTINA CANADA EGYPT NORTH SEA U.S. CENTRAL U.S. GULF The Maule Field: An Economic Small Field Development J. Pyle*, K. Koster, G. Barker and P. Rose

2 Introduction 2 Eocene penetrations with logs, no sand Brimmond sands present Forties Brimmond Maule

3 Brimmond Sand Fairway 3 Brimmond Approximated Gross Thickness B. Kilhams et al., Petroleum Geoscience, Vol , pp Maule Field Area (100% Apache above Forties) Brimmond Field Outline Forties OWC Maule Field Outline

4 4 Wet Sands Clearly Visible NEAR STACK 2005 Near Stack Data A A Wet sands have a class I AVO character Discovery Well (14m TVD net pay) 1 +ve Amplitude -ve Amplitude Dike A -ve Amplitude +ve Forties Field 1 A Offset/Angle Wet Sand 2p 2 Pay Sand

5 Pay Sands Have Class II AVO Response FAR STACK 2005 Far Stack RAI Data A A Continuation of discordant bedding on far stack highlighting the oil leg of the Maule field above a notional OWC of -1970m TVDss Discovery Well (14m TVD net pay) 2 Possible OWC -1960m 1 +ve Amplitude -ve Amplitude Dike A Forties Field -ve Amplitude +ve 5 1 A Offset/Angle Wet Sand 2p 2 Pay Sand

6 6 Maule Discovery Overview 2005 Near Stack Data A A Discovery Well (14m TVD net pay) Very distinct ramp and flat geometry on near stack data indicating the presence of injectites at Maule 2 Sills Possible OWC -1960m 1 Dike +ve Amplitude -ve Amplitude Dike A -ve Amplitude +ve Forties Field 1 A Offset/Angle Wet Sand 2p 2 Pay Sand

7 Maule Reservoir Injected Sands: Outcrop Thoughts 7 Irregular, intrusive bodies with sharp lateral margins and irregular scalloped tops (Thompson et. Al. 1999, 2007). Images from excellent injected sands volume: AAPG Memoir 87 Sand Injectites: Implications for hydrocarbon 5/19/ Exploration and Production. Editors: Andrew Hurst and Joseph Cartwright.

8 Diagnostic Signs for Eocene Sand Injection 8 Steeply dipping seismic character s (in places penetrated by wells) Top Eocene Depth Sand at base Oligocene -only penetration of this age sand in the area. Well crosses a fault at this depth. Steep dips from density image data Jacked up structures above injected sand

9 Pre-Drill Depth Map 9 Anticipated STOIIP of c. 6MMBO mean case Recoverable reserves of 2.9MMBO

10 Pre-Drill Pay Thickness Distribution 10

11 A55x Horizontal Pilot Hole 11

12 A55w Production Wellbore 12

13 Pre-Drill Concepts Confirmed; Finer Details Emerge A55 (Pilot) 10.1m TVD Oil Sand Indicator Seismic (Far Stack RAI) Seismic Top Reservoir OWC -1960m? 50m 5m A55y Rugose tops, high dips especially on entry and exit F 3 A55w 2 A55x Nearby injected lobe at a lower elevation (as seen in discovery)- creates sharp dip boundary at horizontal heel? 50m OWC -1960m? 5m

14 2010 4D Snapshot Records Sweep Pattern 14 -ve Amp +ve A55w Well Curtain Section 2000 Far-Far Stack Quadrature Blue= soft Increase in Sw Far stack soft pick Amp 4D hardening pick +ve Amplitude -ve Amplitude NW SE A55w Seismic boat shot lines over Maule 4-6 weeks after production commenced Full Stack Difference (4D Volume) Red= hardening (interpreted as water displacing oil) Data is excellent quality with a low signal/noise and good 4D response 4D hardening pick Far stack soft pick 80m

15 4D Signal Early in Field Life A11 A11 +ve Amplitude -ve Amplitude A48 A48 A52 A52 H A55w H A55w T T 150m 150m 2010 Far Stack Depth Map D Hardening 15

16 Maule Field Project Timeline & Production History Initial production just 9 months after TD of the discovery well MMBO Cumulative Production Current production steady at c.1000bopd

17 Summary 17 Economic development made possible by: Nearby facilities Small field allowance Flexible, low cost drilling operations Sense of urgency both at Apache and DECC (capitalising on 4D survey data for future development wells) The future for Maule: 2nd producer location identified (aided by 4D data) & planned for Q Potential for further infill location(s) in thinner wings

18 u u Acknowledgements Andrew Hurst & Aberdeen University Apache s: u u u u Klaas Koster Gregg Barker Phil Rose Paul White 18