Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 8-15.doi: 10.12108/yxyqc.20190202

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Sedimentary evolution and its significances for petroleum exploration in the west slope of Kaikang trough,Muglad Basin, Sudan-South Sudan

HONG Liang1, CHEN Bintao1, LIU Xiongzhi1, HUI Xuezhi2, FANG Naizhen1, SU Yuping1   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. No.7 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710021, China
  • Received:2018-08-01 Revised:2018-10-16 Online:2019-03-21 Published:2019-03-21

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Abstract: The west slope of Kaikang trough in Muglad Basin has been proven as a hydrocarbon-enriched belt. However,no significant exploration breakthrough has been gained. In order to study hydrocarbon accumulation conditions and reservoir-controlling mechanism of multi-stage tectonic movements,fine seismic interpretation, sedimentary facies analysis and sedimentary evolution were analyzed. The results show that:(1) The study area underwent three stages of tectonic movement and formed two sets of major petroleum systems,the upper play (lacustrine mudstone seal of upper Nayil Formation and delta sandstone reservoir of lower Nayil Formation) and the lower play (lacustrine mudstone seal of Aradeiba Formation and fluvial sandstone reservoir of Bentiu Formation); (2) The stage Ⅰ rifting-depression of Early Cretaceous controlled the distribution of in-place source rock of AG Formation in the slope area,stage Ⅱ rifting-depression of Late Cretaceous controlled the development of traps in the lower play,and stage Ⅲ rifting-depression of Paleogene controlled the major period of hydrocarbon generation and expulsion that matched with the rifting. The three stages of tectonic-sedimentary evolution worked together to gain the hydrocarbon enrichment model of "fault-seal control the accumulation together,differential accumulation in multi layers" in the west slope of Kaikang trough.

Key words: rifting-depression, sedimentary evolution, petroleum accumulation, west slope of Kaikang trough, Muglad Basin

CLC Number: 

  • TE122
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