Variations of Poisson’s ratio for tight sandstone and shale under changing confining or pore pressure: Characteristics and mechanism

doi:10.13745/j.esf.sf.2020.12.14

Abstract

Abstract:

When the confining pressure (external pressure) or pore pressure (internal pressure) changes, the variation characteristics and mechanism of Poisson’s ratio for tight sandstone and shale still need to be clarified. On the basis of the effective stress theory of Terzaghi and the new concept of effective stress proposed by domestic scholars, this study analyzes the characteristics and mechanism of Poisson’s ratio change based on the dynamic and static Poisson’s ratio measurement results. The rock types consist of tight sandstone of the Gaotaizi Formation and shale of the Qingshankou Formation in the Songliao Basin, respectively. The anisotropic distribution of Poisson’s ratio curves is obvious, which would have some impacts on the propagation law of compression fractures; as far as the scientific definition of “effective stress” is concerned, “Terzaghi effective stress” is suitable for fractured reservoirs while “new effective stress” is suitable for shale with large porosity and uniform pore distribution. The conclusion will provide some important theoretical basis for the effective development of tight oil and gas.

Key words: Songliao Basin, Terzaghi equation, effective stress, Poisson’s ratio;

CLC Number:

TE348
P584

DU Shuheng, LIANG Yaohuan, SHI Yongmin, GUAN Ping. Variations of Poisson’s ratio for tight sandstone and shale under changing confining or pore pressure: Characteristics and mechanism[J]. Earth Science Frontiers, 2021, 28(1): 411-419.

Figures/Tables 14

Fig.1 A sketch map of the study area

Fig.2 Experimental equipments (A and B) and sampling scheme (C). Modified from [37].

Fig.3 Cross-plot between the static Possion’s ratio and the “new effective stress” when changing the external (right panel) or internal (left panel) pressure on the Gaotaizi tight sandstone

Fig.4 Cross-plot between the static Possion’s ratio and the “Terzaghi effective stress” when changing the external (right panel) or internal (left panel) pressure on the Gaotaizi tight sandstone

Fig.5 Cross-plot between the dynamic Possion’s ratio and the “new effective stress” when changing the external (right panel) or internal (left panel) pressure on the Gaotaizi tight sandstone

Fig.6 Cross-plot between the dynamic Possion’s ratio and the “Terzaghi effective stress” when changing the external (right panel) orinternal (left panel) pressure on the Gaotaizi tight sandstone

Fig.7 Cross-plot between the static Possion’s ratio and the “new effective stress” when changing the external (right panel) or internal (left panel) pressure on the Qingshankou source rock of shale

Fig.8 Cross-plot between the static Possion’s ratio and the “Terzaghi effective stress” when changing the external (right panel) or internal (left panel) pressure on the Qingshankou source rock of shale

Fig.9 Cross-plot between the dynamic Possion’s ratio and the “new effective stress” when changing the external (right panel) or internal (left panel) pressure on the Qingshankou source rock of shale

Fig.10 Cross-plot between the dynamic Possion’s ratio and the “Terzaghi effective stress” when changing the external (right panel) or internal (left panel) pressure on the Qingshankou source rock of shale

Table 1 Changing rule of Poisson ratio of the Gaotaizi tight sandstone reservoir

储集层泊松比	变化特征描述	改变内压	改变外压
静态泊松比	曲线类型	线性	对数
	曲线组合样式	“1+1+1”	“2+1”
	“新有效应力”下变化率及各向异性	0.007 MPa^-1 (X≈Y≈Z)	0.001 MPa^-1(Y≈Z)+ 0.002/MPa(X)
	“Terzaghi有效应力” 下变化率及各向异性	0.000 5 MPa^-1 (X≈Y≈Z)	0.001 MPa^-1(Y≈Z)+ 0.002 MPa(X)
动态泊松比	曲线类型	线性	线性
	曲线组合样式	“2+1”	“2+1”
	“新有效应力”下变化率及各向异性	0.203 MPa^-1 (X≈Y≈Z)	0.004 MPa^-1(X≈ Y≈Z)
	“Terzaghi有效应力” 下变化率及各向异性	0.004 MPa^-1 (X≈Y≈Z)	0.004 MPa^-1(X≈ Y≈Z)

Table 2 Changing rule of Poisson ratio of the Qingshankou source rock of shale

烃源岩泊松比	变化特征描述	改变内压	改变外压
静态泊松比	曲线类型	线性	对数(X/Z)+线性(Y)
	曲线组合样式	“2+1”	“1+1+1”
	“新有效应力”下变化率及各向异性	0.010 MPa^-1 (X≈Y≈Z)	0.002 MPa^-1(X)+ 0.000 2 MPa^-1(Y)+ 0.005 MPa^-1(Z)
	“Terzaghi有效应力” 下变化率及各向异性	0.001 MPa^-1 (X≈Y≈Z)	0.002 MPa^-1(X)+ 0.000 2 MPa^-1(Y)+ 0.005 MPa^-1(Z)
动态泊松比	曲线类型	线性	对数(X/Z)+线性(Y)
	曲线组合样式	“1+1+1”	“1+1+1”
	“新有效应力”下变化率及各向异性	0.035 MPa^-1 (X≈Y≈Z)	0.004 MPa^-1 (X≈Y≈Z)
	“Terzaghi有效应力”下变化率及各向异性	0.004 MPa^-1 (X≈Y≈Z)	0.004 MPa^-1 (X≈Y≈Z)

Fig.11 The microscopic characteristics of the Gaotaizi tight sandstone reservoir under the scanning electron microscopy (SEM)

Fig.12 The microscopic characteristics of the Qingshankou source rock of shale under the scanning electron microscopy (SEM)

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