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Green fields today mostly can be regarded as marginal fields and successfully developed. It covers the complete assessment of the oil and gas recovery potential from reservoir structure and formation evaluation, oil and gas reserve mapping, their uncertainties and risks management, feasible reservoir fluid depletion approaches, and to the construction of integrated production systems for cost effective development of the green fields. Depth conversion of time interpretations is a basic skill set for interpreters. There is no single methodology that is optimal for all cases. Next, appropriate depth methods will be presented. Depth imaging should be considered an integral component of interpretation. If the results derived from depth imaging are intended to mitigate risk, the interpreter must actively guide the process.
This section features industry or work-related photographs submitted by readers. Selected pictures will be published on the website. Be sure to provide your full name, job position, company name, picture location, and a caption for the picture. This photo was taken in December 2018 during my PhD defense at the University of Calgary. Picture location: Took the photos at home, but the hard hat itself was made in Indonesia.
Africa (Sub-Sahara) A discovery was made at the Ogo-1 well offshore Nigeria. The well reached a total depth of 3206 m and encountered a gross hydrocarbon section of 524 ft with 216 ft of net stacked pay. Optimum Petroleum Development (60%) is the operator in partnership with Afren (22.86%) and Lekoil (17.14%). Asia Pacific Production has begun on the offshore Wenchang 8-3E oil field in China. The field is located in the western Pearl River Mouth basin in China and has an average water depth of approximately 110 m to 120 m. China National Offshore Oil Corporation is the operator with a 100% interest. The Tayum-1 exploration well encountered approximately 49 vertical ft of net gas pay from multiple sandstone intervals within the Miocene and Pliocene section.
Africa (Sub-Sahara) Oil and gas was discovered at the Nene' Marine exploration prospect located in the Marine XII Block offshore Congo. The prospect is estimated to hold 600 million bbl of oil and 700 Bcf of gas. The well was drilled to a total depth of 3031 m and encountered a pre-saline clastic sequence of Lower Cretaceous age. Eni (65%) is the operator in partnership with New Age (25%) and Societé Nationale des Pétroles du Congo (10%). Gas was discovered at the Mkizi-1 well in Block 1 off Tanzania. The well encountered gas pay in three reservoir intervals within a Tertiary aged stacked channel complex. Total net pay was 108 ft. Ophir (40%) is the operator in partnership with BG Group (60%).
Africa (Sub-Sahara) Drilling began in the SL-5-11 block in the deepwater shelf of west Africa. The targeted depth is 4700 m in water depths of more than 2000 m. Lukoil Overseas (49%) is the operator in partnership with Oranto (30%) and PanAtlantic (21%). Asia Pacific Drilling began on an exploration well in Block G4/50 in the Gulf of Thailand. The planned depth is 2350 m targeting Miocene sandstones. The well is estimated to contain mean prospective recoverable resources of 30 million bbl of oil. Salamander Energy is the operator with a 100% interest. Drilling has been completed on the Klalin-14 development well located in the West Papua region of Indonesia.
Africa (Sub-Sahara) Drilling began on the Bamboo-1 well, located around 35 miles offshore Cameroon in the Ntem concession. The Bamboo prospect is a basin floor fan target within an Upper Cretaceous play. The well will be drilled to an estimated depth of 4200 m. Murphy Cameroon (50%) is the operator, with partner Sterling (50%). The Nene Marine 3 exploration well--located in the Marine XII block, which is around 17 km offshore Congo--encountered a wet gas and light oil accumulation in a presalt clastic sequence Eni (65%) operates the Marine XII block, with partners New Age (25%) and Société Nationale des Pétroles du Congo (10%). Asia Pacific China National Petroleum Corporation (CNPC) stated on its website that its subsidiary, PetroChina, discovered gas in the Moxi block of An'yue field, located in the Sichuan basin, China.
Africa (Sub-Sahara) A drillstem test was performed on the Zafarani-2 well--located about 80 km offshore southern Tanzania. Two separate intervals were tested, and the well flowed at a maximum of 66 MMscf/D of gas. Statoil (65%) is the operator, on behalf of Tanzania Petroleum Development Corporation, with partner ExxonMobil Exploration and Production Tanzania (35%). The FA-1 well--located in 600 m of water in the Foum Assaka license area offshore Morocco--was spudded. The well targets Eagle prospect Lower Cretaceous resources. Target depth is 4000 m. Kosmos Energy (29.9%) is the operator, with partners BP (26.4%),
Africa (Sub-Sahara) BG Group discovered gas in the Taachui-1 well and sidetrack in Block 1, offshore Tanzania. The drillship Deepsea Metro Idrilled Taachui-1 close to the western boundary of Block 1, then sidetracked the well and drilled to a total depth of 4215 m. The well encountered gas in a single gross column of 289 m within the targeted Cretaceous reservoir interval. Net pay totaled 155 m. Estimates of the mean recoverable gas resources are around 1 Tcf. Statoil (65%) and co-venturer ExxonMobil (35%) made a sixth discovery--the Piri-1 well--in Block 2 offshore Tanzania. Piri-1 was drilled by drillship Discoverer Americas, at a water depth of 2360 m.
Africa (Sub-Sahara) Bowleven began drilling operations at its Zingana exploration well on the Bomono permit in Cameroon. Located 20 km northwest of Douala, Cameroon's largest city, the well will target a Paleocene (Tertiary) aged, three-way dip closed fault block. The company plans to drill the well to a depth of 2000 m and will then spud a second well in Moambe, 2 km east of Zingana. Bowleven is the operator and holds 100% interest in the license. Asia Pacific China National Offshore Oil Company (CNOOC) has brought its Dongfang 1-1 gas field Phase I adjustment project on line ahead of schedule. The field is located in the Yinggehai basin of the Beibu Gulf in the South China Sea and has an average water depth of 70 m. The field is currently producing 53 MMcf/D of gas and is expected to reach its peak production of 54 MMcf/D before the end of the year.
Africa (Sub-Sahara) Bowleven has started drilling operations at the Moambe exploration well on the Bomono permit in Cameroon. Moambe is the second well in a two-well program, approximately 2 km east of the first well, Zingana. It targets a previously undrilled Paleocene Tertiary three-way dip fault block containing multiple sands and will be drilled to an estimated 1620 m in measured depth. Both wells will be logged. Bowleven is the operator and holds 100% interest. Asia Pacific Murphy Oil discovered gas at its Permai exploration well in deepwater Block H in the South China Sea offshore Malaysia.