Submarine-fan reservoir architecture of deepwater gasfield X in Rovuma Basin offshore East Africa: insights for the interaction between sediment gravity flows and bottom currents
ZHANG Jiajia1,2, WU Shenghe1,2, WANG Ruifeng3, WANG Min3, CHEN Mei1,2, WANG Xiaofeng4, XU Qingyan3, XIONG Qicong1,2, YU Jitao1,2, WANG Li3
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249,China; 3 Research Institute of Petroleum Exploration and Development,PetroChina, Beijing 100083,China; 4 CNODC Mozambique Ltd.,Company, Beijing 100034,China
Abstract Bottom currents are common phenomenon in the deepwater setting of continental margins,which have important impacts on the deepwater sedimentary process and sandstone distribution. Extensive studies have been focused on the mechanisms and sedimentary products of gravity flow-bottom current interaction,but it remains much unknown regarding the submarine-fan reservoir architecture model modified by bottom currents. The Rovuma Basin offshore East Africa is a typical region to study the interaction between sediment gravity flows and bottom currents. Taking the representative submarine channel systems from the Lower Eocene as an example,this paper characterizes the reservoir architecture by integrating cores,well logs and 3D seismic data,with an aim to establish the submarine channel architecture model under interaction of sediment gravity flows with bottom currents. Results show that the target channel system developed three types of architectural elements,channel,overbank,and lobe,where channel deposits contain channel complexes, individual channels,and other smaller hierarchical units. Fine-grained materials could be transported by bottom currents forming asymmetrical distribution of overbanks deposits. This forced channel complexes to migrate laterally against bottom currents,with shale barriers easily preserved. Individual channels show downstream migration or lateral migration against bottom currents. In downstream migration,channels incised each other forming good sand connectivity,while indined shale baffles may develop in lateral migration. As influenced by sediment gravity flows,individual channel-fills evolved from mixed sand-shale to sand-prone channels,and in the mapview sandbodies are mostly distributed in the axis of channel bends.
Fund:Co-funded by the National Natural Science Foundation of China(Nos. 42002112,42272110),the Strategic Cooperation Technology Projects of CNPC and CUPB(No. ZLZX2020-02),and the Science Foundation for Youth Scholars of China University of Petroleum(Beijing)(No.2462022BJRC006)
About author: ZHANG Jiajia,born in 1990,is a lecturer at College of Geosciences,China University of Petroleum(Beijing). He is mainly engaged in the study of mechanism and characterization of oilfield reservoir heterogeneity. E-mail: zhangjiajia0103@cup.edu.cn.
Cite this article:
ZHANG Jiajia,WU Shenghe,WANG Ruifeng et al. Submarine-fan reservoir architecture of deepwater gasfield X in Rovuma Basin offshore East Africa: insights for the interaction between sediment gravity flows and bottom currents[J]. JOPC, 2023, 25(1): 163-179.
ZHANG Jiajia,WU Shenghe,WANG Ruifeng et al. Submarine-fan reservoir architecture of deepwater gasfield X in Rovuma Basin offshore East Africa: insights for the interaction between sediment gravity flows and bottom currents[J]. JOPC, 2023, 25(1): 163-179.
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