Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (2): 19-27.doi: 10.3969/j.issn.1673-8926.2017.02.003

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Distribution characteristics and main controlling factors of stratigraphic lithologic reservoirs in Jizhong Depression

JIN Fengming1, CUI Zhouqi2, WANG Quan2, LI Li2, REN Chunling2, CUI Mingyang3, XIAO Wei2   

  1. 1. PetroChina Dagang Oilfield Company, Tianjin 300280, China;
    2. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    3. School of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2017-01-09 Revised:2017-03-16 Online:2017-03-21 Published:2017-03-21

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Abstract: In order to understand the distribution law and controlling factors of stratigraphic-lithologic reservoirs in sags of Jizhong Depression,these sags were divided into three types(inherited type,migratory type and early prevailing type)according to their unique geological structures and sedimentary characteristics. It shows that the prospects of stratigraphic-lithologic reservoirs are the best in inherited sags with the largest exploration area,are medium in migratory sags,and are relatively poor in early prevailing sags with disadvantage hydrocarbon accumulation conditions. Various plays of stratigraphic-lithologic reservoirs formed by virtue of configuration between sedimentary systems and structural settings,and distributed in different zones,such as gentle slope belt, steep slope belt and trough belt. It is indicated that the zones of stratigraphic overlap denudation belt,lithofacies transition belt and lake strandline change belt are favorable for the formation of various lithologic or stratigraphic traps,and the changes of lithology,physical properties and contact relationships of sandstone reservoirs provide the favorable conditions for the development of lithologic-tratigraphic traps. The enrichment of“sweet spot”of stratigraphic-lithologic reservoirs in groups and belts is controlled by favorable lithofacies belts and favorable diagenetic facies belts. The areas near the“five belts”(lake strandline change belt,lithofacies transition belt,stratigraphic overlap denudation belt,favorable lithofacies belt and favorable diagenetic facies belt)are the important targets for deepening the exploration of stratigraphic-lithologic reservoirs.

CLC Number: 

  • TE122.3
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