利用测井资料建立地层剪破裂模型

doi:10.13278/j.cnki.jjuese.20170053

摘要/Abstract

摘要： 利用测井资料建立地层剪破裂模型是对现有张破裂的有效补充，有利于完善钻井、压裂等石油工程中的破裂机理。运用FMI（地层微电阻率扫描成像）测井资料能识别钻井诱导缝和剪破裂的方位、数量和密度。本文通过对地层剪破裂的理论研究和影响因素分析，利用内摩擦系数与矿物含量之间的非线性假设，建立了地层剪破裂的临界剪应力模型。研究发现，地层中的黏土矿物含量、内摩擦系数、内聚强度和应力大小是诱发剪破裂的重要因素。利用内摩擦系数（或内摩擦角）与泥质体积分数之间的统计回归模型简化了地层剪破裂模型，并增强了模型的适用性。实际资料表明，地层发生剪破裂时的临界剪应力与钻井诱导缝数量之间呈反比关系，理论研究与实际资料具有良好的一致性。

关键词: FMI, 剪破裂, 张破裂, 诱导缝, 内摩擦角

Abstract: The formation shear fracture model is an effective supplement to the extensional fracture model, which is helpful to improve the fracture mechanism of petroleum drilling and fracturing engineering. Using formation microScanner image (FMI) logging data we can determine the orientation, number and density of drilling induced fractures and shear fractures. Through the analysis of the theoretical research and influence factors on the shear fracture of shale formation and using the nonlinear assumption of internal friction coefficient and mineral content, we established the critical stress model of formation shear failure. It is found that the content of clay minerals, internal friction coefficient, cohesive strength and stress are the important factors for the shear fractures. Based on the statistical regression model between the internal friction coefficient (internal friction angle) and the shale content, the formation shear failure model is simplified, and the applicability of the model is enhanced. The actual data show that an inverse relationship exists between the critical stress calculated by the shear failure model and the number of drilling induced fractures. The actual data are in good agreement with the theoretical result.

Key words: formation microscanner image, shear fracture, extensional fracture, drilling induced fractures, internal friction angle

中图分类号:

P631.8

廖东良, 曾义金. 利用测井资料建立地层剪破裂模型[J]. 吉林大学学报(地球科学版), 2018, 48(4): 1268-1276.

Liao Dongliang, Zeng Yijin. Establishment of Formation Shear Fracture Model by Logging Data[J]. Journal of Jilin University(Earth Science Edition), 2018, 48(4): 1268-1276.

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