Abstract:
Geologically, Block 2768-3 (Ex Block-22) is situated in the Central Indus Basin on the northeastern flank of Khairpur-Jacobabad high. The block has a long, staggered exploration history. OGDCL relinquished the block without drilling after acquiring 445 line km 2D seismic data in 1976. In 1991, Block-22 was granted to OMV (Operator) PPL/Hardy Joint Venture who acquired about 855 line km 2D seismic data and delineated three small structures at Sui Main Limestone (SML) of Eocene. The total Gas Initially In Place (GIIP) of 57 Bcf estimated for these structures was considered uneconomical and therefore the area was relinquished by the JV. The area was granted to Petroleum Exploration (Pvt) Limited [PEL-Operator] and GHPL on 16 November 1994. The re-evaluation and re-mapping of the existing data by PEL T indicated another large structure (Hamza) in the northeastern part of the block with estimated GIIP of 1.5 Tcf. Considering the possibility of a large upside potential in the block, PPL acquired 65% working interest along with operatorship on 1st July 1996. The exploration team of the PPL re-evaluated the block with a modest G&G work including reprocessing/ mapping of 258 line km 2D vintage data of OGDCL and OMV. This resulted in delineation of five small sized structures (three prospects `A`, `C` and `D` and two lead `B` and `E`) at SML level. It was clear since inception of the project that no single prospect could be economical on stand-alone basis due to their small sizes and possible higher concentration of non-combustible gases as that in the offset Kandra & Badar discoveries. However, it was envisaged that in case of multiple discoveries and cost optimization, the project could turn out to be profitable due to its proximity to the infrastructure and the gas demand in the country. Therefore, based on the prospectivity ranking, JV drilled 1st exploratory well Hamza X-1 over prospect `A` considered to be the largest followed by two exploratory wells, Hasan X-1 & Sadiq X-1 on prospects `D` & `C` during 1998-2000 which resulted in three consecutive gas discoveries. The structural leads `B` and `E` were firmed up with further 2D seismic of 50 line km in the year 2000-2002. Exploratory well Yusuf X-1 (2000) was drilled on Prospect `E` which turned out to be water wet whereas, exploratory well Khanpur X-1 drilled on prospect `B` resulted in fourth gas discovery in the block in 2002. Based on the encouraging test results, the JV obtained three D & PLs over Hasan, Sadiq, and Khanpur discoveries with a total GIIP of about 197 Bcf. Hamza discovery is under further evaluation.The area once marked as uneconomical by various Operators has proven to be economical and it is producing about 20 MMcfd gas. This has happened as a result of JV commitment to explore & exploit indigenous energy resources, persistent efforts of JV partners, a step-wise approach, prudent project management, and tight budgetary control resulting in relatively low well costs and optimum capex investment. The JV continued its efforts for economical development of Hamza discovery. The recently acquired seismic has indicated that Hamza X-1 was drilled down-dip close to GWC and an up-dip potential exists for drilling another well. Accordingly the JV have decided to drill another well on Hamza structure
Page(s):
153-170
DOI:
DOI not available
Published:
Journal: Proceedings SPE-PAPG Annual Technical Conference, Volume: 0, Issue: , Year: 2008