Research on high-intensity fracturing stimulation measures for continental shale oil in Subei Basin

DI SHIYING; MA SHOU; CAI LYUZHONG; CHENG SHIQING; SHI WENYANG

doi:10.13809/j.cnki.cn32-1825/te.2024587

Engineering Techniques | Views : 0 下载量: 138 CSCD: 0 CNKI被引量: 0 Scopus: 0 更多指标

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Research on high-intensity fracturing stimulation measures for continental shale oil in Subei Basin
Vol. 16, Issue 2, Pages: 434-442(2026)
Received：31 March 2025，

Published：26 March 2026
DOI： 10.13809/j.cnki.cn32-1825/te.2024587
稿件说明：

移动端阅览

邸士莹, 马收, 蔡履忠, 等. 苏北盆地陆相页岩油高强度压裂增产措施研究[J]. 油气藏评价与开发, 2026, 16(2): 434-442. DOI： 10.13809/j.cnki.cn32-1825/te.2024587.

DI Shiying, MA Shou, CAI Lyuzhong, et al. Research on high-intensity fracturing stimulation measures for continental shale oil in Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2026, 16(2): 434-442. DOI： 10.13809/j.cnki.cn32-1825/te.2024587.

摘要

页岩油藏结构复杂，储层普遍具有低渗、低孔特征，基质向裂缝的供液能力较弱，压裂增产措施是改善储层裂缝发育程度与流体流动能力的关键手段。传统压裂施工方案中，针对储层结构特征对压裂强度影响的直接研究较少，导致增产效果不佳。为优化压裂方案，基于储层结构开展系统研究，通过X射线衍射实验（XRD）明确岩石矿物成分及含量；借助小直径真三轴实验获取岩石力学参数及应力-应变测试曲线；结合电镜扫描资料与薄片观察确定储层微观结构；利用渗吸实验及核磁共振实验（NMR），基于

谱曲线分析储层岩石孔径分布特征。采用数值模拟方法，对比常规强度压裂与高强度压裂后的裂缝扩展形态及产能差异。研究结果表明，苏北页岩脆性矿物含量较高；平行层理方向页岩破坏后裂缝主要沿层理发育，垂直层理方向破裂形态多样，岩心内部形成交叉复杂裂缝；储层微观结构以粒间孔为主，微裂缝以层理缝为主；核磁共振

谱曲线显示储层岩心发育小孔隙、中孔隙及天然微裂缝。数值模拟结果显示，该区块岩石特征适配高强度压裂方案（排量20 m

/min、单段液量4 000 m

、单段砂量400 m

）。实施该方案后，水平井附近储层含油饱和度场与压力场发生明显变化，表明高强度压裂可形成更复杂的缝网系统，提升储层流体流动性，有效改善压裂增产效果。研究成果为页岩油藏压裂增产方案优化提供了参考依据。

Abstract

Shale oil reservoirs are characterized by complex structures

low permeability

and low porosity. The fluid supply capacity from the matrix to the fractures is weak. Fracturing stimulation measures are key methods for improving the degree of fracture development and fluid flow capacity in the reservoirs. In traditional fracturing construction plans

there are limited direct studies on the influence of reservoir structural characteristics on fracturing intensity

which leads to poor production enhancement results. To optimize the fracturing design

systematic research was conducted based on the reservoir structure

and X-ray diffraction (XRD) experiments were used to clarify the mineral composition and content of the rocks. Small-diameter true triaxial experiments were performed to obtain rock mechanics parameters and stress-strain test curves. Sca

nning electron microscope data and thin section observations were combined to determine the microstructure of the reservoir. Imbibition experiments and nuclear magnetic resonance (NMR) experiments were conducted

and the pore size distribution characteristics of the reservoir rocks were analyzed based on the

spectrum curves. Numerical simulation method was used to compare the fracture propagation patterns and production capacity differences between conventional intensity fracturing and high-intensity fracturing. The results showed that the shale from Subei Basin had a high content of brittle minerals. After failure in the direction parallel to bedding

fractures mainly developed along the bedding

while in the direction vertical to bedding

the fracture patterns were diverse

and complex intersecting fractures were formed inside the core. The microstructure of the reservoir was mainly composed of intergranular pores

and the micro-fractures were mainly layer-bedding fractures. The NMR

spectrum curves showed that the reservoir core developed small pores

medium pores

and natural micro-fractures. The numerical simulation results indicated that the rock characteristics of this block were suitable for implementing the high-intensity fracturing plan (displacement rate of 20 m

/min

single-stage fluid volume of 4 000 m

and single-stage sand volume of 400 m

). After the implementation of this plan

significant variations were observed in the oil saturation field and pressure field of the reservoir near the horizontal well

indicating that high-intensity fracturing could form a more complex fracture network system

enhance the fluid mobility of the reservoir

and effectively improve the fracturing stimulation effectiveness. The research findings provide a reference for the optimization of fracturing stimulation plans in shale oil reservoirs.

关键词

Keywords

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