钻遇断层阵列侧向测井响应特性正演研究

Abstract

Abstract:

Firstly, we established a 3D forward model of the vertical well when drilling in faults, the response of the array lateral logging was numerically simulated by the finite element method. And then, we analyzed the effects of different fault dip angles, fault distances, and surrounding rock conductivity on the characteristics of array lateral logging response in the drilling process of fault. The results showed that when in the drilling process of the fracture zone, the larger the fault dip angle was, the smaller the width of the fracture zone would be reflected by the apparent resistivity. As the array lateral logging equipment went deeper and the fault distance（≤4 meters） got greater, the measured apparent resistivity would be closer to the resistivity of the fractured zone and surrounding rocks. When under the same detection mode, the apparent resistivity would increase with the increasing of the resistivity of lower surrounding rocks. When the detection mode and the surrounding rock resistivity were the same, the apparent resistivity would decrease with the increase of the resistivity of the surrounding rock while drilling the footwall of fault.

Key words: array lateral logging, fault, finite element, 3D geological modeling

CLC Number:

TE132.1

Yang Yong,Li Heng,Yang Duo,Du Shuangjun,Peng Jie,Chen Kun. Forward simulation of response characteristics of the array lateral logging in drilling process of fault[J].Reservoir Evaluation and Development, 2019, 9(2): 50-55.

Figures/Tables 8

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References 19

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井段序号	不同井眼位置
1	仪器经上围岩穿过断层的下盘到达下围岩;仪器水平距离断层破碎带中心点15 m
2	仪器经上围岩,并穿过小段的破碎带,又经一小段上围岩,再到断层下盘及下围岩;仪器水平距离断层破碎带中心点6 m
3	仪器经上围岩、断层上盘一角、破碎带、断层下盘及下围岩;仪器水平距离断层破碎带中心点3 m
4	仪器经上围岩、断层上盘、破碎带、断层下盘及下围岩;仪器水平距离断层破碎带中心点2 m
5	仪器经上围岩、断层上盘、破碎带、断层下盘及下围岩;仪器水平距离断层破碎带中心点1 m
6	仪器经上围岩、断层上盘、破碎带、断层下盘及下围岩;仪器垂直穿过破碎带中心点
7	仪器经上围岩、断层上盘、破碎带、断层下盘及下围岩;仪器水平距离断层破碎带中心点1 m
8	仪器经上围岩、断层上盘、破碎带、断层下盘及下围岩;仪器水平距离断层破碎带中心点2 m
9	仪器经上围岩、断层上盘、下围岩、穿过一小段破碎带穿到下围岩;仪器水平距离断层破碎带中心点6 m
10	仪器经过上围岩、断层上盘到下围岩;水平距离断层破碎带中心点15 m

Forward simulation of response characteristics of the array lateral logging in drilling process of fault

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