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| 鄂尔多斯盆地沿河湾探区低渗储层长6_1构造裂缝主要形成期应力环境判识 | |
| 引用本文： | 周新桂,张林炎,黄臣军,刘格云,万晓龙,鄢犀利.鄂尔多斯盆地沿河湾探区低渗储层长6_1构造裂缝主要形成期应力环境判识[J].现代地质,2009,23(5). |
| 作者姓名： | 周新桂 张林炎 黄臣军 刘格云 万晓龙 鄢犀利 |
| 作者单位： | 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 |
| 基金项目： | 中国石化华北分公司科研项目，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" |
| 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(1δ)方向为NW—SE向,优势方位129°∠10°,最小主应力(3δ)优势方位36°∠7°,中间主应力(2δ)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 |
Palaeostress Judgement of Tectonic Fractures in Chang 61 Low Permeable Reservoir in Yanhewan Area, Ordos Basin in Main Forming Period |
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| ZHOU Xin-gui,ZHANG Lin-yan,HUANG Chen-jun,LIU Ge-yun,WAN Xiao-long,YAN Xi-li.Palaeostress Judgement of Tectonic Fractures in Chang 61 Low Permeable Reservoir in Yanhewan Area, Ordos Basin in Main Forming Period[J].Geoscience——Journal of Graduate School,China University of Geosciences,2009,23(5). | |
| Authors: | ZHOU Xin-gui ZHANG Lin-yan HUANG Chen-jun LIU Ge-yun WAN Xiao-long YAN Xi-li |
| 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 6_1 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. |
| Keywords: | the period of tectonic fracture forming the condition of palaeostress Chang 6_1 low permeable reservoir Yanhewan explorative area Ordos Basin |
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