陆相泥页岩在水平地应力作用下裂缝的多样性——以济阳坳陷古近系泥页岩为例

doi:10.7623/syxb201907002

石油学报 ›› 2019, Vol. 40 ›› Issue (7): 777-785.DOI: 10.7623/syxb201907002

陆相泥页岩在水平地应力作用下裂缝的多样性——以济阳坳陷古近系泥页岩为例

包友书

中国石油化工股份有限公司胜利油田分公司勘探开发研究院山东东营 257015

收稿日期:2018-05-23 修回日期:2018-10-17 出版日期:2019-07-25 发布日期:2019-07-28
作者简介:包友书,男,1972年9月生,1995年毕业于承德石油高等专科学校,2012年获中国石油大学地质资源与地质工程专业博士学位,现为中国石油化工股份有限公司胜利油田分公司勘探开发研究院高级工程师,主要从事石油地质及地球化学研究。Email:baoyoushu@126.com
基金资助:
国家科技重大专项（2016ZX05006-001，2017ZX05049-004）和中国石油化工股份有限公司科技攻关项目（KL17035）资助。

Fracture diversity of continental shale under horizontal geostress: a case study of the Paleogene shale in Jiyang depression

Bao Youshu

Exploration and Development Research Institute, Sinopec Shengli Oilfield Company,Shandong Dongying 257015,China

Received:2018-05-23 Revised:2018-10-17 Online:2019-07-25 Published:2019-07-28

摘要/Abstract

摘要：

基于水平最大主应力（S_H）、水平最小主应力（S_h）和垂向应力（S_V）数据，探讨了济阳坳陷的地应力状态。济阳坳陷中，埋深小于2 600 m的地层总体处于Ⅰ类地应力状态（S_V>S_H>S_h），埋深大于3 200 m的地层一般处于Ⅲ类地应力状态（S_H > S_V > S_h），在不同地区由Ⅰ类地应力状态转换为Ⅲ类地应力状态的深度不同。利用岩心资料分析了Ⅲ类地应力状态下的动力学特征，动力学作用表现为横向挤压和错动，并识别出5类典型的Ⅲ类地应力裂缝，即脆性层竖直缝、非均质层竖直主干缝+水平分支缝、雁列式方解石透镜体充填缝、挤压逆冲派生缝和复杂网状缝。由于陆相泥页岩的组成和力学性质在纵向上具有强烈的非均质性，在Ⅲ类地应力状态下更容易形成多样性裂缝。

关键词: 地应力, 裂缝, 陆相泥页岩, 古近系, 济阳坳陷

Abstract:

Based on the data of maximum horizontal principal stress (S_H), minimum horizontal principal stress (S_h) and vertical stress (S_V), this study explores the geostress characteristics of Jiyang depression. The strata with the burial depth less than 2 600 m are generally under the type Ⅰ geostress (S_V > S_H > S_h), and that with the burial depth greater than 3 200 m are generally under the type Ⅲ geostress (S_H > S_V > S_h). The depth of geostress transforming from type Ⅰ to type Ⅲ is different for various regions. The kinematic feature of shales under type Ⅲ geostress was analyzed by coring data, shown as lateral compression and displacement, and five categories of typical type Ⅲ geostress factures were identified, i.e., vertical joints in brittle layer, vertical main fractures jointed by horizontal branch fractures in anisotropic shale, fractures filled with en echelon calcite crystals in lenticular forms, overthrusting fractures and complex reticular fractures. The continental shale has strong heterogeneity in composition and mechanical properties in the vertical direction. Therefore, continental shale is prone to form various fractures under type Ⅲ geostress.

Key words: geostress, fracture, continental shale, Paleogene, Jiyang depression

中图分类号:

TE122.3

包友书. 陆相泥页岩在水平地应力作用下裂缝的多样性——以济阳坳陷古近系泥页岩为例[J]. 石油学报, 2019, 40(7): 777-785.

Bao Youshu. Fracture diversity of continental shale under horizontal geostress: a case study of the Paleogene shale in Jiyang depression[J]. Acta Petrolei Sinica, 2019, 40(7): 777-785.

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陆相泥页岩在水平地应力作用下裂缝的多样性——以济阳坳陷古近系泥页岩为例

Fracture diversity of continental shale under horizontal geostress: a case study of the Paleogene shale in Jiyang depression

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