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Natural Gas Geoscience ›› 2021, Vol. 32 ›› Issue (6): 923-930.doi: 10.11764/j.issn.1672-1926.2021.01.014

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Method and application of in-situ stress field to evaluate fault sealing of underground gas storage traps

Guang-quan ZHANG(),Da-qian ZENG,Zhao-wei FAN,Li-dong MI,Jun-fa ZHANG,Dan-dan WANG,Yue-wei JIA,Xiao-song YANG   

  1. SINOPEC Petroleum Exploration and Production Research Institute，Beijing 100083，China
  • Received:2020-10-13 Revised:2021-01-17 Online:2021-06-10 Published:2021-05-24
  • Supported by:
    The Project Group of SINOPEC Ministry of Science and Technology(p18096);Supported by National Natural Science Foundation of China(51804334)

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Abstract:

At present， there are great differences in the evaluation methods of underground gas storage traps in different regions and types， especially in the aspect of fault dynamic sealing， there is no systematic and complete evaluation method and system. Based on the investigation of a large number of literatures on sealing evaluation of gas storage at home and abroad， combined with the sealing evaluation examples of 27 built gas storages in China， this paper puts forward a method to evaluate the dynamic sealing property of gas storage traps by using stress field. From the perspective of geomechanics， the dynamic sealing property of gas storage traps is evaluated by analyzing the change of stress field in the process of injection and production. Firstly， the in-situ stress parameters of single well are calculated， the current three-dimensional in-situ stress field is established， and the spatial distribution of principal stress and effective stress is analyzed. Secondly， the Coulomb failure criterion is used to judge the fault stability under the present in-situ stress state. Finally， the main purpose of this paper is to establish a three-dimensional numerical model to simulate the dynamic change of reservoir pressure and the cyclic pressure of gas injection reservoir. The process of dynamic change （effective stress） of in-situ stress caused by the change can be used to evaluate the stress risk of fault sealing. This method can be used to determine whether the gas storage can be operated safely under different injection production periods.

Key words: Underground gas storage, Trap sealing, In situ stress field, Pore pressure, Coupling model

CLC Number: 

  • TE121

Table 1

Calculation model of in-situ stress and rock mechanical parameters of single well in underground gas storage"

模型参数计算公式公式符号说明
上覆岩层压力σV=∫0Hρgdhρ为岩石密度，g/cm3;g为重力加速度,m/s2;h为垂深,m
地层孔隙压力Pp=σV-σV-PNCTxNCTxobs3.0PNCT为正常地层压力,MPa;xNCT、xobs分别为正常压力和实际压力条件下的测井响应
最大水平主应力SHmax=K1×SV-Pp+PpK1为最大水平主应力有效应力比值，暂取0.43
最小水平主应力SHmin=K2×SV-Pp+PpK2为最小水平主应力有效应力比值，暂取0.62
砂岩单轴抗压强度UCSST=325??700×exp-0.037×DTCODTCO为声波时差,s/m
泥岩单轴抗压强度UCSSH=72.5×Vp2Vp为纵波速率,km/s
砂、泥岩动态弹性模量YMD=ρVs23Vp2-4Vs2/Vp2-Vs2Vp、Vs分别为纵、横波速率,km/s
砂、泥岩静态弹性模量YMS=0.066×YMD1.632
动态泊松比PRD=Vp2-2Vs2/2Vp2-Vs2Vp、Vs分别为纵、横波速率,km/s
伪密度DEN=0.23×1??000??000/DTCO0.25DTCO为声波时差,s/m

Fig.1

In situ stress model"

Fig.2

Stress distribution pattern of rock sample under triaxial compression"

Fig.3

Fault distribution of X underground gas storage"

Fig.4

Laboratory test results of faults of X underground gas storage"

Fig. 5

Calculation results of in-situ stress of Well X1"

Fig.6

3D geostress model of overlying formation pressure (SV) of X underground gas storage"

Fig.7

Parameter diagram of ground stress of F1 fault in X underground gas storage"

Fig.8

Stability of fault under current in-situ stress of X underground gas storage （Tau-ratio of foult F1）"

Fig.9

Stability of fault under maximum pore pressure predicted by underground gas storage"

Fig.10

Distribution of pore pressure at a certain time in the section"

Fig.11

Four dimensional dynamic stability analysis of fault"

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