Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (1): 126-135.doi: 10.12108/yxyqc.20260111

• PETROLEUM EXPLORATION • Previous Articles    

A method for assessing fault lateral sealing based on high-resolution geological modeling: A case study of Archean buried hill reservoir in Xinglongtai structural belt of Liaohe Depression

LI Bin(), MIN Zhongshun, MENG Lingna, ZHANG Yuanli, YIN Jianfeng, ZHOU Peijie   

  1. Research Institute of Exploration and Development, PetroChina Liaohe Oilfield Branch, Panjin 124010, Liaoning, China
  • Received:2025-05-09 Revised:2025-08-05 Online:2026-01-01 Published:2026-01-23

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Abstract:

Allan diagram analysis is of great significance for the study of fault sealing. Taking Archean buried hill hydrocarbon reservoir in Xinglongtai structural belt of Liaohe Depression as an example, an improved Allan diagram method based on high-resolution geological modeling technology was proposed to analyze fault sealing by integrating well logging, 3D seismic, and experimental analysis and testing data. The results show that: （1） The high-resolution geological model established based on the well-seismic integration can address the issue of missing well-location data. Based on a detailed analysis of lithology development and fracture-forming capability in various regions of the metamorphic buried hill, the high-resolution geological model can accurately depict the stratigraphic contact relationship and lithology distribution pattern on both sides of the fault. After manual inspection and adjustment, the final improved Allan diagram can be formed. （2） There are six lithology docking patterns on the fault plane in the study area. The docking patterns with good sealing properties include breccia-mudstone, migmatite-mudstone, migmatite-gneiss, migmatite-breccia, and breccia-breccia. The peripheral faults F3 and F5 in the area are completely sealed, and the altitude of the leakage point in the area is -4 390 m. （3） Cross-verification was carried out by combining the fuzzy mathematics method and the on-site fluid distribution. The analysis results of each region were highly consistent with the lateral fault sealing analyzed by the improved Allan diagram method, indicating that the method shows excellent applicability and accuracy in metamorphic buried hills and has high application value.

Key words: improved Allan diagram method, fault sealing, gas storage, high-resolution geological modeling, Archean buried hill, Xinglongtai structural belt, Liaohe Depression

CLC Number: 

  • TE122

Fig. 1

Location of Xinglongtai structural belt （a） and stratigraphic column （b） of Liaohe Depression"

Fig. 2

Schematic diagram of the principle of traditional Allan diagrams"

Fig. 3

Analysis process of improved Allan diagrams based on high-resolution geological modeling technology"

Table 1

Comprehensive information statistics of buried hill faults in the southern block of Xinglongtai structural belt, Liaohe Depression"

断
层		 性
质		 与地层
组合关系		 断距/m 埋深/m 走
向		 倾向 倾角/（°） 长度/m 与现今主应力关系/（°） 对盘岩性 对盘流体 断层泥
比率SGR		 断面正应力/MPa
F3 正 反向式 200~300 4 700 EW S 65~75 6.30 30~45 泥岩 无油气 0.81 40~60
F4 正 反向式 250~800 4 600 EW N—NE 65~75 4.60 85~95 角砾岩、混合岩 薄层差油层 0.35 40~60
F5 正 反向式 150~400 4 600 NE W 65~75 3.20 0~5 泥岩、片麻岩、煌斑岩 无油气 0.41 40~60
F6 正 同向式 50~300 4 400 EW S 65~75 2.20 30~45 泥岩、角砾岩、混合岩 油水界面
一致		 0.26 40~60

Table 2

Discrete membership functions and weighting coefficients for lateral sealing of buried hill faults in the southern block of Xinglongtai structural belt, Liaohe Depression"

影响因素 性质 隶属度 权重系数
断层性质 正断层 0.7 0.02
逆断层 1.0
与地层产状
组合关系		 正向式断层 1.0 0.02
反向式断层 0
断层倾角/(°) > 50 0.3 0.02
< 50 1.0
断层埋深/m > 4 500 1.0 0.02
< 4 500 0.7
断层断距/m > 500 1.0 0.02
< 500 0.7
与最大主应力
夹角/(°)		 垂直 1.0 0.05
夹角 0.7
平行 0.3
对盘岩性 储集岩 0 0.19
非储集岩 1.0
对盘流体性质 无油气显示 1.0 0.22
差油气层 0.8
油水界面不一致 0.4
油水界面一致 0
断层泥比率SGR > 0.60 1.0 0.19
0.30~0.60 0.5
< 0.30 0
断面正压力/MPa > 60 1.0 0.15
40~60 0.7
< 40 0.5

Table 3

Comprehensive evaluation criteria for lateral sealing of buried hills faults in the southern block Xinglongtai structural belt, Liaohe Depression"

侧向封闭性 封闭 不封闭
评判指标B > 0.50 < 0.50

Table 4

Fuzzy mathematics-based evaluation results of fault lateral sealing for buried hills in the southern block of Xinglongtai structural belt, Liaohe Depression"

断层 评判指标B 侧向封闭性
F3 0.91 封闭
F4 0.64 封闭
F5 0.83 封闭
F6 0.29 不封闭

Fig. 4

Process of establishing a high-precision tectonic model for buried hills in the southern block of Xinglongtai structural belt, Liaohe Depression"

Fig. 5

Lithology statistics for buried hills in the southern block of Xinglongtai structural belt, Liaohe Depression"

Fig. 6

Lithology-fracture density histogram of buried hills in the southern block Xinglongtai structural belt, Liaohe Depression"

Fig. 7

Lithology allocation plan for buried hills in the southern block of Xinglongtai structural belt, Liaohe Depression"

Fig. 8

Simplified lithology model for buried hills in the southern block of Xinglongtai structural belt, Liaohe Depression"

Fig. 9

Fine characterization for connection status of lithology cross-section of buried hills in the southern block of Xinglongtai structural belt, Liaohe Depression"

Fig. 10

Applications evaluation of improved Allan diagrams for buried hills in the southern block of Xinglongtai structural belt, Liaohe Depression"

Fig. 11

Profile of Archean reservoir in buried hills in the southern block of Xinglongtai structural belt, Liaohe Depression"

Fig. 12

Reservoir profile （a） and comparison of crude oil physical properties （b） of Archean in buried hills in the southern block of Xinglongtai structural belt, Liaohe Depression"

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