考虑隔层影响的页岩油储层可压性评价方法

doi:10.13809/j.cnki.cn32-1825/te.2023.01.008

Abstract

Abstract:

The physical properties of shale oil reservoir are extremely poor, so it is necessary to form a network fracture system through volume fracturing to realize economic and effective development. However, there are lower permeability interlayers both in the top and bottom of shale oil reservoirs, so to master the fracture propagation law of reservoir with interlayers is the key for the successful fracturing of shale oil. With the help of the numerical simulation software, RFPA, of the rock fracture damage analysis system, the influencing factors of fracture propagation in the reservoir interlayers are studied. On the premise of considering the heterogeneity of strata, and by the comprehensively consideration of the elastic modulus, Poisson's ratio, uniaxial compressive strength, tensile strength, horizontal stress difference and interlayer stress difference of the reservoir, the fracability of shale oil reservoir is evaluated by the analytic hierarchy process. The results show that the elastic modulus of the reservoir interlayer, the difference of horizontal in-situ stress and the uniaxial compressive strength of the reservoir are negatively correlated with the degree of crack propagation. As these parameters increase, the cracks are more difficult to expand. However, there is a positive correlation between the ratio of tension and compression of reservoir and the stress difference between layers of reservoir and the degree of fracture propagation, that is, the increase of tensile strength and interlayer stress difference will help to increase the scale of fracture propagation, and the larger interlayer stress difference will make the fractures pass through the interlayers and continue to develop in the interlayer. Meanwhile, the mathematical model of the fracability is established by the analytic hierarchy process in fuzzy mathematics, and applied to the fractured wells in the work area. The predicted results are consistent with the experimental microseismic monitoring results, and the research results can provide reference for shale oil fracturing reform.

Key words: shale reservoir, interlayer, fracability, numerical simulation, analytic hierarchy process

CLC Number:

TE132

LIU Yexuan,LIU Xiangjun,DING Yi,ZHOU Xin,LIANG Lixi. Evaluation method of fracability of shale oil reservoir considering influence of interlayer[J].Reservoir Evaluation and Development, 2023, 13(1): 74-82.

Figures/Tables 15

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Table 1

Table 2

Table 3

Table 4

Table 5

Table 6

Comprehensive evaluation result of fracability"

井号	E^s	$σ t s$	$σ c t s$	μ^s	E^k	$σ t k$	$σ c t k$	μ^k	σ_sd	σ_ah	D
1	0.589	0.593	0.595	0.483	0.472	0.515	0.533	0.454	0.592	0.543	0.569
2	0.636	0.615	0.587	0.475	0.483	0.521	0.526	0.473	0.623	0.555	0.595
3	0.534	0.553	0.549	0.431	0.425	0.486	0.504	0.417	0.569	0.523	0.529
4	0.495	0.528	0.516	0.405	0.419	0.477	0.512	0.398	0.522	0.504	0.497

Table 6

Table 7

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储层弹性模量	储层单轴抗压强度	储层压拉比	储层泊松比	隔层弹性模量	隔层单轴抗压强度	隔层压拉比	隔层泊松比	层间应力差	水平地应力差
1.235	0.942	0.425	0.052	0.512	0.294	0.108	0.077	1.474	0.230
负相关	负相关	正相关	负相关	负相关	负相关	正相关	负相关	负相关	负相关

	泊松比	压拉比	单轴抗压强度	弹性模量
泊松比	1	3	5	7
压拉比	1/3	1	3	5
单轴抗压强度	1/5	1/3	1	3
弹性模量	1/7	1/5	1/3	1

	泊松比	压拉比	单轴抗压强度	弹性模量
泊松比	1	2	5	8
压拉比	1/2	1	4	7
单轴抗压强度	1/5	1/4	1	3
弹性模量	1/8	1/7	1/3	1

	水平地应力差	层间应力差
水平地应力	1	8
层间应力差	1/8	1

参数	λ_max	CI	RI	一致性比例	检验标准
储层参数	4.071	0.024	0.890	0.021	<0.1
隔层参数	4.076	0.026	0.890	0.023	<0.1
地应力参数	2.000	0	0	0	<0.1

Evaluation method of fracability of shale oil reservoir considering influence of interlayer

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井号	事件数	储层改造体积（10⁴m³）	可压性指数
1	52	457.65	0.569
2	68	529.40	0.595
3	42	303.50	0.529
4	38	283.05	0.497