致密砂岩多期裂缝形成机制及定量表征研究进展

孙志勇; 陈开远; 冯建伟; 隋淑玲

致密砂岩多期裂缝形成机制及定量表征研究进展

1.
中国地质大学(北京)能源学院, 北京 100083
2.
中国石化胜利油田分公司勘探开发研究院, 山东东营 257015
3.
中国石油大学(华东)地球科学与技术学院, 山东青岛 266580

基金项目:

国家重大专项"大型油气田及煤层气开发" 2008ZX05014-004

中央高校基本科研业务费专项资金 14CX05016A

详细信息

作者简介:
孙志勇(1979-), 男, 高级工程师, 主要从事石油地质研究工作。E-mail:502498897@qq.com

中图分类号: TE122
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出版历程
- 收稿日期: 2016-10-11
- 刊出日期: 2017-04-01

RESEARCH PROGRESS ON THE FORMATION MECHANISM AND QUANTITATIVE CHARACTERIZATION OF MULTIPHASE FRACTURE NETWORKS OF TIGHT SANDSTONE

1.
School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China
2.
Exploration and Development Research Institute, Shenglioilfield, SINOPEC, Dongying 257015, Shandong, China
3.
School of Geosciences in China University of Petroleum, Qingdao 266580, Shandong, China

摘要

摘要: 致密砂岩油气是重要的非常规资源，裂缝作为主要渗流通道，其本身分布规律的复杂性以及多期发育和多期充填的特征，直接影响着裂缝预测的精度，目前尚缺乏一套全面解决构造裂缝定量预测的系统方法。因此，需要深入探讨多期裂缝的识别、充填过程和形成—叠加演化机制，建立合理的裂缝表征模型，以定量预测裂缝参数分布范围。在大量文献调研的基础上，本文认为致密储层裂缝研究主要涉及三个关键方向：通过野外露头和岩心观察，分析裂缝发育特征，结合构造演化和流体包裹体分析，确定裂缝发育期次；通过热液充填模拟实验和岩石力学实验，揭示裂缝充填机制，及其在多期应力作用下裂缝的萌生、扩展和叠加过程；采用实验统计方法，基于能量守恒定理和最大应变能密度理论，建立考虑裂缝差异充填的各向异性强度破裂准则，建立裂缝参数的定量表征模型。最终，本文形成和完善了致密砂岩多期裂缝演化及量化表征的理论体系，为此类油气田的勘探开发提供重要科学依据。
- 致密砂岩 /
- 多期裂缝 /
- 差异充填 /
- 叠加演化 /
- 定量表征
Abstract: Tight sandstone oil gas is an important unconventional resource.As the primary seepage channel, fracture networks commonly have the charactistics including complex distribution regularity as well as multiphase development and filling process, which directly influence fracture prediction accuracy.At present, there is no systematic method for solving the quantitative prediction of structural fissures, which is still in the exploration stage. Therefore, it is necessary to explore more about fraction networks identification, filling process and formation-superposition evolution mechanism. and set up a reasonable fracture characterization model for quantitative prediction of fracture networks parameter distribution range. On the basis of plenty of literature research, it is believed that the research of tight reservoir fracture is mainly in three key directions.Field observation and core observation were carried out to analyze the development characteristics of fracture networks.combing with tectonic evolution history and fluid-inclusion analysis, fractures development times were defined. Then, hydrothermal filling simulation experiments and rock mechanics experiments were conducted to reveal the mechanism of fractures filling and dynamic process of fractures from initiationto extension and superposition. Finally, experimental statistical methods were used to establish the anisotropic failure criterion in view of different filling rules and create quantitative characterization of fracture parameters based on the principle of conservation of energy and the theory of strain energy density factor. At last, a theoretical system of multiphase fractures development and their parameters characterization were formed and completed, which provides an important scientific basis for the exploration and exploit of tight sandstone gas field.
- tight sandstone /
- multiphase fracture networks /
- different filling /
- evolution of superposition /
- quantitative characterization

HTML全文

图 1 岩石同一截面在不同应力阶段的CT扫描图像^[9]

Figure 1. A CT scan of the same section of the rock in different stress stages

下载: 全尺寸图片幻灯片

图 2 岩石抗剪强度与先存裂缝走向与后期压应力方向夹角的关系(据文献[18]修改)

Figure 2. Relationship between the shear strength of rock and angle between the direction of the crack and the stress direction at the later stage

下载: 全尺寸图片幻灯片

图 3 研究技术路线总体框图

Figure 3. Block diagram of technical thoughts

下载: 全尺寸图片幻灯片

图 4 史深100块沙三中现今应力场下的裂缝开度和裂缝线密度^[38]

Figure 4. Fracture aperture and fracture linear density in middle reservoirs of the third Shahejie Formation of block Shishen 100

下载: 全尺寸图片幻灯片

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