Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (6): 66-76.doi: 10.12108/yxyqc.20240607

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Favorable exploration area and formation condition of bedrock reservoir in the of central paleo-uplift，northern Songliao Basin

RAN Yixuan1, WANG Jian1, ZHANG Yi2   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. Exploration and Production Research Institute, Daqing Oilfield, Daqing 163712, Heilongjiang, China
  • Received:2024-06-26 Revised:2024-07-07 Online:2024-11-01 Published:2024-11-04

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Abstract: The favorable area of bedrock gas exploration in the central paleo-uplift of Songliao Basin was se lected on the basis of genesis and formation condition analysis，in order to find the gas accumulation areas. The result shows that：（1）The gas composition and genesis in the central paleo-uplift of northern Songliao Basin is similar to Xujiaweizi fault depression. They are all coal-type gas formed in high and over mature stage，indicate that the gas in the central paleo-uplift is come from the Xujiaweizi fault depression.（2）The union of formation condition such as favorable source rock，favorable reservoir，transport system and favorable cap are the key fac tors for bedrock reservoir. The TOC of source rocks of Shahezi Formation mudstone and coal is 4.33% and 32.56%，which are in mature to high state. The hydrocarbon generation intensity in Songzhan sag and Xuxi sag is greater than 180×108 m3/km2，which is main gas source for the bedrock reservoirs. The pore layer on top of weathering crust and fracture layer in bottom of inner bedrock are the favorable reservoirs，which are formed by "weathering + fracture"，with a porosity of 4.3% and 1.3%，and permeability of 0.45 mD and 6.3 mD. There are “S”type，“T”type and“fault- fracture”transport channels coupled by the crust of weathering，fault and frac ture，promote the natural gas migration in lateral. The mudstone of Denglouku Formation formed early than gas migration，which is characteristic by great thickness and high breakthrough pressure，due to the preservation of gas reservoirs.（3）Central paleo-uplift can be divided to three favorable exploration areas. The gas in Wangjiatun and Changde bulge are mainly crust of weathering，with a“S”type and“T”type transport channel. The gas are control by the union of transport channel and preservation condition. The gas in Zhaozhou bulge are bedrock gas reservoir，with a transport channel of“fault- fracture”body，which is under controlled by reservoir thickness， quality and trapes.

Key words: bedrock reservoir, accumulation condition, pore layer of weathering rust, fracture layer of inner bedrock, dense zone of inner bedrock, source rocks of Shahezi Formation, central paleo-uplift, northern Songliao Basin

CLC Number: 

  • TE122.3
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