Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (3): 27-38.doi: 10.12108/yxyqc.20210303

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Element feature and coupling model of source-to-sink system in depression lacustrine basin: A case study of Neogene Jimidi Formation in Melut Basin, South Sudan

YANG Lisha1,2, CHEN Bintao1, MA Lun1, SHI Zhongsheng1, XUE Luo1, WANG Lei1, SHI Jianglong1, ZHAO Yanjun3   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. Key Laboratory of Reservoir Description, CNPC, Lanzhou 730020, China;
    3. CNPC International Nile Limited, Khartoum 10687, Sudan
  • Received:2021-02-03 Revised:2021-03-19 Published:2021-06-03

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Abstract: Characteristics of elements in source-to-sink system and their coupling relationships，as one of the most important method for quantitative prediction in sediments and oil/gas reservoirs，have become the research hotspots in sedimentology. In order to characterize the elements feature and coupling relationships of source-to-sink system during the deposition of Neogene Jimidi Formation in Melut Basin，well drilling and logging data analysis，and interpretation of high-resolution 3D seismic data and 2D seismic data in the basin margins were carried out，and the elements of the source-to-sink system for depression lacustrine basin were characterized. The results show that： （1）The basement in the north depression of Melut Basin was dominated by Precambrian metamorphic rocks（phyllite）and granitic gneiss. Three first-level catchments were developed in the study area during the deposition of Jimidi Formation，four types of transportation pathways，V-type，U-type，W-type and fault trough type，were found.（2）Three source-to-sink systems can be divided：Kaka-Ruman source-to-sink system in the northwest was the typical slope-type source-to-sink coupling model，where the river-shallow delta depositional system of 600 m2 was developed in the catchment；Gandool-Wengi source-to-sink system in the northeast and Tean-Ruman West source-to-sink system in the southwest were characterized by fault-slope-break，where fan deltas of 400 km2 and 112 km2 were developed respectively.（3）The quantitative analysis for elements of the source-to-sink systems in the study area showed that the total sediments inside the basin were closely relevant with area of catchments in the source area，topographic height difference and cross-sectional area of the transport channel during the depression stage in the lacustrine basins. The area of catchments was the primary influencing factor for the scales of depositional systems，and large catchments were favorable for the development of large depositional systems. Based on the results，types of depositional system and direction of sediments source for Jimidi Formation in Ruman area of Melut Basin have been confirmed and the distribution of favorable reservoir sandbodies have been predicted， which will guide the exploration deployment effectively.

Key words: source-to-sink system, quantitative analysis, coupling relationship, Jimidi Formation, Neogene, Melut Basin, depression lacustrine basin

CLC Number: 

  • TE121.3
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