Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (5): 35-45.doi: 10.12108/yxyqc.20240504

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Prediction and main controlling factors of tuff reservoirs of Cretaceous Huoshiling Formation in Dehui fault depression，Songliao Basin

WANG Hongxing1, HAN Shiwen2, HU Jia1, PAN Zhihao1   

  1. 1. Research Institute of Geophysical Exploration, PetroChina Jilin Oilfield Company, Songyuan 138000, Jilin, China;
    2. No. 2 Geo-Logging Company, PetroChina Daqing Drilling Engineering Company, Songyuan 138000, Jilin, China
  • Received:2023-10-06 Revised:2024-04-08 Online:2024-09-01 Published:2024-09-04

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Abstract: Based on the core analysis，data of well logs and seismic，the distribution characteristics and oil-gas enrichment conditions of tuff reservoirs of Cretaceous Huoshiling Formation in Dehui fault depression of Songliao Basin were analyzed by using forward modelling and multi-parameter inversion body fusion technology， and the distribution of high-quality reservoirs was predicted. The results show that：（1）The tuff of Cretaceous Huoshiling Formation in Dehui fault depression，Songliao Basin，is a pyroclastic rock formed by fissure eruption，which mainly consists of breccia-bearing welded tuff，breccia-bearing crystal tuff and sedimentary tuff. The seismic reflection shows low frequency，poor continuity，medium strong amplitude or weak amplitude. The sweet spot distribution of tuff reservoirs predicted by multi-parameter inversion body fusion technology has a high coincidence rate with drilling data. The average value of tuff reservoir drilling catching rate is 92.8%，and the average gas reservoir drilling catching rate is 81.0%，among which 12 wells has obtained industrial gasflow. The reservoirs of Huajia structural belt and Guojia fault step belt are mainly composed of breccie-bearing welded tuff and breccie-bearing crystal tuff，with developed faults，making these two areas as the high-quality reservoir zones.（2）The lithology and lithofacies template formed by matching the well log and seismic facies characteristics of the tuff in the study area were useful to identify seismic facie of the tuff. It was confirmed that the crater and proximal crater facie characterized by amplitude attributes are favorable lithology distribution areas. （3）High-quality source rocks developed in Huoshiling Formation，Shahezi Formation and Yingcheng Formation have a thickness of more than 300 meters，with TOC of 0.26%-5.08%，0.10%-5.55%，0.10%-9.74%，S1+S2 of 0.24-8.23 mg/g，0.12-18.15 mg/g，0.25-2.86 mg/g，and Ro of 0.6%-1.3%，1.1%-1.6%，1.0%-2.2%，respectively. With the characteristic of high abundance and moderate maturity，they lay a good material foundation for a large-scale reservoir formation.（4）The tuff gas reservoir in the study area is a set of tight gas reservoirs with source and reservoir lateral connection and high enrichment. The accumulation is mainly controlled by structural styles，faults development and hydrocarbon supply windows. The imbricated fault-bending folds formed by tension and extension，is the major factor to control the degree of hydrocarbon enrichment，and the size of faults and hydrocarbon supply windows determine the gas reservoir scale.

Key words: tuff, seismic amplitude attribute, source and reservoir lateral connection, tectonic style, fault bend fold, hydrocarbon supply window, forward modelling, Huoshiling Formation, Cretaceous, Dehui fault depression, Songliao Basin

CLC Number: 

  • TE122
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