Study on rock mechanics characteristics and fracture conductivity of shale reservoirs in Chang 7 member of Ordos Basin

LIU ZHICHAO; LAI FENGPENG; DOU LIANGBIN; ZHANG LINLIN

doi:10.13809/j.cnki.cn32-1825/te.2024454

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Study on rock mechanics characteristics and fracture conductivity of shale reservoirs in Chang 7 member of Ordos Basin

Engineering Techniques | 更新时间：2026-03-10

- Study on rock mechanics characteristics and fracture conductivity of shale reservoirs in Chang 7 member of Ordos Basin
- Petroleum Reservoir Evaluation and Development Vol. 16, Issue 2, Pages: 458-468(2026)
- 作者机构：
  
  1.中国地质大学（北京）能源学院，北京 100083
  2.非常规天然气能源地质评价与开发工程北京市重点实验室，北京 100083
  3.西安石油大学石油工程学院，陕西西安 710065
  4.中国石油长庆油田分公司物资供应处，陕西西安 710016
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2024454
  CLC： TE122
- Received：07 February 2025，
  
  Published：26 March 2026
- 稿件说明：
移动端阅览
柳智超, 赖枫鹏, 窦亮彬, 等. 鄂尔多斯盆地长7段页岩储层岩石力学特征及裂缝导流能力研究[J]. 油气藏评价与开发, 2026, 16(2): 458-468.

LIU Zhichao, LAI Fengpeng, DOU Liangbin, et al. Study on rock mechanics characteristics and fracture conductivity of shale reservoirs in Chang 7 member of Ordos Basin[J]. Petroleum Reservoir Evaluation and Development, 2026, 16(2): 458-468.
柳智超, 赖枫鹏, 窦亮彬, 等. 鄂尔多斯盆地长7段页岩储层岩石力学特征及裂缝导流能力研究[J]. 油气藏评价与开发, 2026, 16(2): 458-468. DOI： 10.13809/j.cnki.cn32-1825/te.2024454.

LIU Zhichao, LAI Fengpeng, DOU Liangbin, et al. Study on rock mechanics characteristics and fracture conductivity of shale reservoirs in Chang 7 member of Ordos Basin[J]. Petroleum Reservoir Evaluation and Development, 2026, 16(2): 458-468. DOI： 10.13809/j.cnki.cn32-1825/te.2024454.

摘要

页岩油作为非常规油气资源，已成为全球能源开采的热点。然而，页岩油储层具有低孔低渗的特点，传统开采技术难以实现高效产出，需采用水力压裂技术进行开发。页岩岩石力学特征显著影响压裂效果。通过岩石力学实验和X射线衍射全岩心实验，对比分析了鄂尔多斯盆地长7段页理型、纹层型和夹层型3种不同类型页岩的弹性模量、泊松比等力学参数及地应力变化，明确了不同类型页岩的力学性质与储层特征，并建立了矿物成分与岩石力学特征的关联性。同时，通过支撑剂导流能力实验和嵌入实验，揭示了压裂裂缝导流能力的变化规律，为支撑剂选择提供指导。结果表明：①夹层型页岩弹性模量大、泊松比小，易于造缝；页理型和纹层型页岩地应力梯度大，裂缝扩展难度较高。②岩石中刚性矿物含量越高，弹性模量越大、泊松比越小；脆性矿物含量越高，脆性指数越大。相较于纹层型和页理型页岩，夹层型页岩性质硬脆，压裂时更易产生裂缝且能有效保持裂缝张开。③基于夹层型页岩的力学性质，其支撑剂嵌入深度最小，导流能力最强，有利于流体流动。根据支撑剂选择实验，建议低围压下采用10~20目石英砂作为支撑剂，支撑剂填充密度宜为14 kg/m²。

Abstract

Shale oil

as an unconventional oil and gas resource

has become a global hotspot for energy extraction. However

shale oil reservoirs are characterized by low porosity and low permeability

making it difficult for traditional extraction technologies to achieve efficient production

and hydraulic fracturing technology is required for development. The mechanical characteristics of shale significantly influence the fracturing effectiveness. Through rock mechanics experiments and X-ray diffraction whole-rock analysis

the mechanical parameters

such as elastic modulus

Poisson’s ratio

and in-situ stress variations of three different types of shale (laminated

bedded

and interbedded) in the Chang 7 Member of the Ordos Basin

were compared and analyzed

clarifying the mechanical properties and reservoir characteristics of different shale types and establishing the relationship between mineral composition and rock mechanical characteristics. Additionally

the variation patterns of fracture conductivity were revealed through proppant conductivity experiments and embedding experiments

providing guidance for proppant selection. The results showed that: (1) interbedded shale had a high elastic modulus and a s

mall Poisson’s ratio

making it easy to create fractures

while laminated and bedded shales had higher in-situ stress gradients

making fracture propagation more difficult. (2) The higher the content of rigid minerals in the rock

the larger the elastic modulus and the smaller the Poisson’s ratio. The higher the content of brittle minerals

the larger the brittleness index. Compared with bedded and laminated shales

interbedded shale was hard and brittle

making it easier to generate fractures and effectively maintain fracture opening during fracturing. (3) Based on the mechanical properties of interbedded shale

it had the smallest proppant embedment depth and the highest conductivity

which facilitated fluid flow. According to the proppant selection experiments

it is recommended to use 10-20 mesh quartz sand as the proppant under low confining pressure

with a proppant packing density of 14 kg/m

关键词

Keywords

references

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