页岩储层脆性指数的随钻测井计算方法研究——以威远地区寒武系筇竹寺组为例

Abstract

Abstract:

As a new parameter of the rock mechanics evaluation, the brittleness index （BI） has an important influence on the later fracturing and reconstruction of the reservoirs. The traditional calculation methods of the BI applied to the geosteering drilling of the shale gas horizontal wells have many limitations. Aiming at the calculation of the BI in real time by the LWD curves, we started with the experimental study on the BI and porosity to provide an experimental basis for calculating the BI by the porosity log information. Then, we used the regression method to analyze the relevance of the AC, DEN, CNL, GR logging values and BI, calculated the BI by using single LWD curves, and through the contribution of different logging curves to the BI, established a BI calculation method by logging while drilling of the shale reservoirs. Finally, we analyzed the feasibility of the model by the examples. The research result shows that the model is effective and adaptable, which provides a reliable basis for the geosteering drilling of the horizontal wells of the shale gas by the BI.

Key words: brittleness index（BI）, Shale gas horizontal well, LWD, Logging curve, Geosteering

CLC Number:

TE311

Hanwei Wang,Hongquan Xia,Chang Liu, et al. Research on calculation method of BI by logging while drilling of shale reservoirs: A case of Qiongzhusi formation in Cambrian, Weiyuan area[J]. Reservoir Evaluation and Development, 2018, 8(3): 73-78.

Figures/Tables 9

Table 1

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Table 2

Calculation model of brittleness index by logging while drilling with different logging curves"

随钻测井曲线组合类型	脆性指数的随钻测井计算模型
AC、DEN、CNL、CGR	$B I 1 = 146.725 - 0.338 AC - 22.257 DEN - 0.453 CNL - 0.081 CGR$
DEN、CNL、CGR	$B I 2 = 156.002 - 31.073 DEN - 0.633 CNL - 0.113 CGR$
DEN、CGR	$B I 3 = 211.688 - 49.299 DEN - 0.272 CGR$
CGR	$B I 4 = - 0.356 CGR + 86.687$

Table 2

Fig. 7

References 15

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Research on calculation method of BI by logging while drilling of shale reservoirs: A case of Qiongzhusi formation in Cambrian, Weiyuan area

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