多尺度离散裂缝三维精细地质建模及地热资源评价研究——以渤海湾盆地献县地热田为例

doi:10.13809/j.cnki.cn32-1825/te.2024622

Abstract

Abstract:

The Xianxian County geothermal field in the Bohai Bay Basin is highly developed, providing data support for the refined construction of geothermal field models and the evaluation of geothermal resources. Structurally, the Xianxian geothermal field belongs to the Xianxian County Uplift of the Cangxian County Uplift in the Bohai Bay Basin, with the Fucheng Depression to the east and the Raoyang Depression to the west. The main thermal reservoirs developed in the study area are porous sandstone thermal reservoirs and karst limestone thermal reservoirs. Taking the Wumishan Formation limestone thermal reservoir of the Jixian System as the research object, a multi-scale discrete fracture three-dimensional refined geological modeling method was employed to evaluate the geothermal resources of the Xianxian County geothermal field. The geological structure model of the Xianxian County geothermal field was constructed using deterministic and stochastic modeling methods. The model mesh was set with a step size of 25 m × 25 m, and 300 layers were simulated vertically, with a single layer thickness of 1 m and a total mesh number of 2 333.06 × 10⁴. Under the constraints of the secondary interpretation results of well logging, a geological model of lithofacies, physical properties, and temperature fields of the Wumishan Formation was established. The model analysis showed that the distribution trend of thermal reservoir resources in the Xianxian County geothermal field was positively correlated with the structural morphology of the Xianxian County Uplift. The shallower the burial depth, the better the geothermal resource conditions. Comparison with existing well completion parameter data further validated the model, indicating good adaptability. A volumetric method based on the refined thermal reservoir geological model was employed to evaluate the geothermal resources in the region. The results showed that the total thermal reservoir capacity of the Wumishan Formation in the Jixian System of Xianxian County geothermal field was 2.881 × 10¹⁶ kJ, equivalent to 9.841 × 10⁸ t of standard coal, with a total recoverable heat of 0.432 × 10¹⁶ kJ. The hot water volume was 35.75 × 10⁸ m³, and the heat content in the hot water was 0.105 × 10¹⁶ kJ, equivalent to 0.359 × 10⁸ t of standard coal. These findings confirm the huge potential of geothermal resources in the Xianxian County geothermal field, and the proposed model provides technical support and basis for the subsequent development in the Xianxian County geothermal field.

Key words: Bohai Bay Basin, Xianxian County geothermal field, multi-scale discrete fracture, geological modeling, geothermal resource evaluation

CLC Number:

TE132

REN Xiaoqing,GAO Xiaorong,WANG Hongliang, et al. Research on multi-scale discrete fracture 3D refined geological modeling and geothermal resource evaluation: A case study of Xianxian County geothermal field, Bohai Bay Basin[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(6): 1104-1111.

Figures/Tables 13

Table 1

Fig. 1

Table 2

Table 3

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Table 4

Table 5

Characteristic values of rock physical property parameters in Xianxian County geothermal field， Bohai Bay Basin"

热储	岩石密度特征值 $ρ r$ /(kg/m³)			岩石比热特征值 $c r$ /[kJ/(g·℃)]			岩石孔隙度特征值φ/%
热储	最小值	最大值	最可能值	最小值	最大值	最可能值	最小值	最大值	最可能值
雾迷山组	2 702.0	3 060.0	2 881.0	0.86	1.02	0.94	1.00	32.91	13.5

Table 5

Table 6

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井名	井深/m	利用热储段深度/m	裂缝类型	孔隙度/%	渗透率/10^-3 μm²	井温/℃
ZFJ2	2 157.00	1 526.00~2 157.00	Ⅰ类裂缝	11.25	345.59	87
GYY1	2 210.00	1 568.90~2 210.00	Ⅲ类裂缝	8.79	6.07	90
GYY2	2 114.00	1 501.50~2 114.00	Ⅱ类裂缝	9.03	63.35	80
GYY3	2 559.00	1 630.00~2 559.00	Ⅲ类裂缝	8.93	5.14	84
NGC1	2 060.00	1 459.00~2 060.00	Ⅱ类裂缝	8.16	26.44	92
NGC2	2 187.00	1 554.00~2 187.00	Ⅲ类裂缝	8.57	11.97	93
NGC3	2 200.00	1 591.00~2 200.00	Ⅲ类裂缝	7.94	0.89	96
ZFJ1	2 080.00	1 476.00~2 080.00	Ⅲ类裂缝	6.62	3.22	88
XFT2	2 200.00	1 449.62~2 200.00	Ⅰ类裂缝	10.73	164.10	86

地质分层	纵向模拟层/个	单层厚度/m
平原组	5	50~80
明化镇组	50	10~20
雾迷山组	300	1

井名	模拟温度/℃	实测温度/℃	误差率/%
NGC3	95	96	1.04
GYY1	88	90	2.22
XFT2	85	86	1.16
ZF1	84	88	4.54

Research on multi-scale discrete fracture 3D refined geological modeling and geothermal resource evaluation: A case study of Xianxian County geothermal field, Bohai Bay Basin

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