Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (4): 136-146.doi: 10.12108/yxyqc.20240412

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Tight reservoir characteristics and favorable areas prediction of Lower Cretaceous Nantun Formation in central fault depression zone of Hailar Basin

TIAN Ya, LI Junhui, CHEN Fangju, LI Yue, LIU Huaye, ZOU Yue, ZHANG Xiaoyang   

  1. Research Institute of Exploration and Development, PetroChina Daqing Oilfield Co., Ltd., Daqing 163712, Heilongjiang, China
  • Received:2023-02-02 Revised:2023-03-17 Online:2024-07-01 Published:2024-07-04

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Abstract: The data of core analysis，cast thin sections and high-pressure mercury injection were used to study the reservoir characteristics and main controlling factors of Lower Cretaceous Nantun Formation in central fault depression zone of Hailar Basin，and the favorable areas were quantitatively and comprehensively evaluated. The results show that：（1）The rock types of Nantun Formation in in central fault depression zone of Hailar Basin are mainly lithic sandstone and feldspathic lithic sandstone，with reservoir porosity less than 12% accounting for 70.2% and permeability less than 1 mD accounting for 66.3%. It belongs to the category of tight sandstone reservoir，and the reservoir space is a small number of primary pores and a large number of secondary pores.（2）The sedimentary facies control the overall spatial distribution of reservoir properties in the study area. The most favorable sedimentary facies zones of Nantun Formation are braided river delta front and fan delta front subfacies. Compaction has a pore reducing effect on the reservoir，and dissolution is generally developed，forming a large number of intergranular and intragranular dissolved pores，which has a certain improvement effect on the reservoir properties.（3）There are three types of structural belts developed in the central fault depression zone of the basin：gentle slope fault terrace structural belt，steep slope fault terrace structural belt，and trough belt. Among them，the gentle slope fault terrace structural belt and steep slope fault terrace structural belt are the main oil and gas accumulation zones，and the development of their faults is earlier than or contemporaneous with a large number of hydrocarbon expulsion stages of the source rocks，providing channels for oil and gas migration.（4）Five elements of sedimentary facies，porosity，reservoir thickness，sand to stratum ratio and burial depth were superimposed to quantitatively evaluate the favorable reservoir development areas. Among them，type Ⅰ and type Ⅱ high-quality reservoirs are mainly distributed in the gentle slope fault terrace structural belt and steep slope fault terrace structural belt in the central fault depression zone of the basin.

Key words: tight reservoir, braided river delta front, fan delta front, gentle slope fault terrace structural belt, steep slope fault terrace structural belt, Nantun Formation, Lower Cretaceous, central fault depression zone, Hailar Basin

CLC Number: 

  • TE122.2
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