Lithologic Reservoirs >

2011 , Vol. 23 >Issue 3: 84 - 90

DOI: https://doi.org/10.3969/j.issn.1673-8926.2011.03.016

Study on mixed sedimentary facies of Lower Cretaceous Albian in block A of Lower Congo Basin

  • PENG Wenli ,
  • CUI Dian ,
  • WU Kongyou ,
  • LIU Zhenyu
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology， Chengdu 610059， China； 2. Research Center of CNOOC， Beijing 100049， China； 3. Geology Exploration and Development Institute， Chuanqing Drilling Engineering Co. Ltd.， Chengdu 610051， China

Online published: 2011-06-20

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Abstract

Lower Cretaceous Albian in block AofLower CongoBasin deposited a set of carbonatemixed facies composed of terrigenous sand and mud. Based on regional geologic setting, logging geology, seismic data and thin section observation, the mixed deposition of Albian in the study area is analyzed. The research result shows that:①The profile structure is characterized by 4 types, including alternating deposits of terrigenous debris and carbonate, alternating deposits of terrigenous debris and diamicton, alternating deposits of carbonate and diamicton, and alternating deposits of diamicton themselves; ②A mixed deposition mechanism appropriate for the study area is proposed, called “discontinuity- overlapping” mixed deposition, and the mixed deposition model is established; ③With the seawater entering and the expansion of transgression, the Albian experienced mixed gentle slope, mixed restricted platform, mixed open platform and mixed continental shelf successively, and developed numerous sedimentarymicrofacies such as lime mud mound, sandy shoal, oolitic beach, bioclastic shoal, algal-clastic beach, subtidal static water mudstone and tempestite.

Key words： fault sealing; compaction and packing action; cementation; Nanbaijiantan fault; Junggar Basin

Cite this article

PENG Wenli , CUI Dian , WU Kongyou , LIU Zhenyu . Study on mixed sedimentary facies of Lower Cretaceous Albian in block A of Lower Congo Basin[J]. Lithologic Reservoirs, 2011 , 23(3) : 84 -90 . DOI: 10.3969/j.issn.1673-8926.2011.03.016

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