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现代地质 ›› 2009, Vol. 23 ›› Issue (5): 843-851.

• 石油构造 • 上一篇    下一篇

鄂尔多斯盆地沿河湾探区低渗储层长61构造裂缝主要形成期应力环境判识

 周新桂1, 张林炎1, 黄臣军1, 刘格云2, 万晓龙3, 鄢犀利1   

  1. 1中国地质科学院 地质力学研究所,北京100081; 2兰州大学 资源与环境学院,甘肃 兰州730000;
    3中国石油长庆油田分公司 勘探开发研究院,陕西 西安710021
  • 收稿日期:2009-04-10 修回日期:2009-07-20 出版日期:2009-10-20 发布日期:2012-02-16
  • 作者简介:周新桂,男,研究员,1966年出生,石油地质专业,主要从事石油地质、储层裂缝定量预测及地应力与油气富集规律研究工作。Email:xinguizhou100@sina.com。
  • 基金资助:

    中国石化华北分公司科研项目(P02077-2,HBK2004-2);中国石油长庆油田分公司科研项目“安塞沿河湾、吴旗地区长6储层裂缝特征和分布规律研究”

Palaeostress Judgement of Tectonic Fractures  in Chang 61 Low Permeable Reservoir in Yanhewan Area, Ordos Basin in Main Forming Period

 ZHOU  Xin-Gui1, ZHANG  Lin-Yan1, HUANG  Chen-Jun1, LIU  Ge-Yun2, WAN  Xiao-Long3, YAN  Xi-Li1   

  1. 1Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing100081,China;
    2College of Resource and Environmental Engineering, Lanzhou University, Lanzhou,Gansu730000,China;
    3Academy of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi'an,Shaanxi710021,China
  • Received:2009-04-10 Revised:2009-07-20 Online:2009-10-20 Published:2012-02-16

摘要:

开展储层裂缝预测研究,首先必须认识构造裂缝形成的期次及其古应力状态。通过上三叠统延长组长61储层岩石声发射实验得出的古构造历史有效最大主应力记忆出现率,厘定鄂尔多斯盆地沿河湾探区长61储层构造裂缝形成时最大主应力介于79.12~89.99 MPa之间。通过岩石古应力分期、裂缝充填物包裹体测温和期次测定,结合区域构造应力场演化分析,确定延长组储层构造裂缝主要形成期为燕山期。通过露头区地层和覆盖区定向岩心共轭裂缝或节理应变测量,恢复了沿河湾地区燕山期构造运动三轴应力状态,即最大主应力(δ1)方向为NW—SE向,优势方位129°∠10°,最小主应力(δ3)优势方位36°∠7°,中间主应力(δ2)近于垂直。裂缝主要形成期及其古应力状态研究成果为沿河湾探区长61低渗储层构造裂缝分布和发育规律定量预测研究提供了地质依据。

关键词: 裂缝形成期, 构造应力环境, 长61低渗储层, 沿河湾探区, 鄂尔多斯盆地

Abstract:

It must be definitely replied to the forming time of tectonic fracture in reservoirs and the state of palaeostress in estimating and predicting work. According to the method of acoustic emission(AE) palaeostress measurement, the effective percentage of the maximum principal stress can be concluded  in the history of palaeo- structure.The AE measurements reveal that  the corresponding maximum principal stress is in the range of 80 to 98 MPa in Chang 61 low permeable reservoir of Upper Triassic in Yanhewan area, Ordos Basin.Based on the result of palaeostress stage,the thermometry measurement of fracture filling inclusion and the evolution characteristics of regional stress field, it can be confirmed that the tectonic fractures form at Yanshanian movement.By the measurement of the strain of the conjugated fissures located in the outcrop area or the overlay area, the triaxial stress state in Yanshanian is resumed in this area.The direction of the maximum principal stress is NW-SE direction, predominant direction is 129°∠10°, the predominant direction of the minimum principal stress is 36°∠7°, the intermediate principal stress is approximate vertical.Those results can provide some references for prediction of tectonic fracture in low permeability reservoirs.

Key words:  The period of tectonic fracture forming, the condition of palaeostress, Chang 61 low permeable reservoir, Yanhewan explorative area, Ordos Basin

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