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.
Given the heterogeneous nature of the carbonates, significant difficulties arise when attempting to determine productive intervals using only petrophysical evaluations and borehole image logs. This paper discusses how productive intervals are identified by integrating mobility from formation pressure testers. To determine the role exerted by diagenetic processes (mainly cementation and compaction) on the fluid storage and migration pathways within the slope to deepwater carbonates, permeability structures had to be appraised. Over the past several decades, wireline formation testers have proved to be an efficient method of assessing mobility and inferred productivity, in addition to gathering representative fluid samples for accurate pressure, volume, and temperature (PVT) analysis. Recent advancements have further improved the efficiency of wireline testers in such environments by combining the benefits of straddle packer systems with enhanced probes. In this paper, in-depth analysis is presented on the integration of a comprehensive pressure and productivity data set acquired using the latest-generation wireline tools with advanced formation evaluation and image logs. The revolutionary advances provided by a new multifrequency dielectric tool were also used to provide an Archie mn exponent log from continuous in-situ measurement of rock texture.
White, Charles N. (Enersea Transport) | Copple, Robert W. (International Design, Engineering and Analysis Services (I.D.E.A.S.), Inc.) | Capanoglu, Cuneyt (International Design, Engineering and Analysis Services (I.D.E.A.S.), Inc.)