Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 106-116.doi: 10.12108/yxyqc.20230612

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Deep-water sedimentary characteristics and sequence boundary identification of Middle Eocene in Rovuma Basin,East Africa

SUN Hui, FAN Guozhang, WANG Hongping, DING Liangbo, ZUO Guoping, MA Hongxia, PANG Xu, XU Xiaoyong   

  1. PetroChina Hangzhou Research Institute of Petroleum Geology, Hangzhou 310023, China
  • Received:2023-04-24 Revised:2023-05-09 Online:2023-11-01 Published:2023-11-07

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Abstract: Guided by the classic model of sequence stratigraphy,using core,welllog,mudlog and seismic data,the characteristics of the third-order and fourth-order sequence boundaries of Middle Eocene in the deep-water area of Rovuma Basin in East Africa were summarized. Corresponding to channel-lobe complexes in deep-water depo-sits,sedimentary subfacies and microfacies were divided. Based on this,the evolution laws of deep-water deposits and the influence of sedimentary microfacies on reservoirs were explored. The results show that:（1）The top boundary of the third-order sequence of Middle Eocene in Rovuma Basin is located at the top of the condensed section and occasional carbonate debris flow,and the bottom boundary is located at the bottom of the gravity flow that migrates southward in stages. The fourth-order sequence is determined by the top boundary of the bathyal deposit and the sedimentary interface with good continuity on the seismic section,but can only be interpreted within the distribution range of the channel-lobe complexes.（2）Two sedimentary facies,including channel complex and lobe complex,have been identified in deep-water deposits in the study area. The two sedimentary facies can be subdivided into four subfacies:composite channel,lobe,crevasse splay,and overbank/drift deposits. There are nine microfacies,including channel axis/edge filling,internal natural levee,mass transport deposits（MTD）,channel bottom lag deposit,lobe element main body/edge,crevasse splay,and overbank/drift deposits. Both crevasse splay and overbank/drift deposits are distributed in the northern part of the composite channel,and the crevasse splay affected by bottom flow is in a northward divergent vein shape.（3）The evolution of deep-water depo-sits of Middle Eocene in the study area can be divided into four stages,namely SQ1-SQ4 in sequence,showing a process of progradational deposition and retrograde deposition as a whole. Affected by the interaction between gravity flow and bottom current,the channel-lobe complexes gradually migrated southward.（4）The development of reservoirs in the research area is mainly controlled by sedimentary microfacies. The main body of the lobe element and the axis of the channel developed high-quality reservoirs. The reservoirs are the most developed and the physical properties are the best in the main body of the lobe element,with a porosity of 13.00%-21.00% and a permeability of 5.0-118.0 mD. The reservoir properties at the axis of the channel are secondary,with a poro-sity of 13.00%-19.00% and a permeability of 0.8-23.0 m D. The reservoir properties of overbank/drift deposits are poor,and the reservoirs in the crevasse splay are not developed.

Key words: deep-water deposit, gravity flow, bottom current, composite channel-lobe, crevasse splay, sequence boundary, Middle Eocene, Rovuma Basin in East Africa

CLC Number: 

  • TE121.3
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