基于动态弹性力学模型的煤系致密砂岩储层裂缝预测方法

黄玉欣; 胡望水; 尹帅

doi:10.11911/syztjs.2018082

基于动态弹性力学模型的煤系致密砂岩储层裂缝预测方法

黄玉欣^1,2,
胡望水¹,
尹帅^3, ,

1.
长江大学地球科学学院, 湖北武汉 430100;
2.
中国石油吉林油田分公司勘探开发研究院, 吉林松原 138000;
3.
西安石油大学地球科学与工程学院, 陕西西安 710065

基金项目:

国家科技重大专项"致密油有效开发机理与关键技术"（编号：2016ZX05046-003-001）资助。

详细信息

作者简介:
黄玉欣(1981-),男,吉林农安人,2004年毕业于长江大学资源勘查工程专业,2007年获长江大学矿物学岩石学矿床学专业硕士学位,在读博士研究生,主要从事非常规致密储层评价研究工作。

通讯作者:
尹帅,speedysys@163.com

中图分类号: P618.13
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出版历程
- 收稿日期: 2017-06-30
- 刊出日期: 1899-12-31

Fracture Prediction Method for Coal-Bearing Tight Sandstone Reservoirs Based on a Dynamic Elastic Mechanics Model

1.
College of Geoscience, Yangtze University, Wuhan, Hubei, 430100, China;
2.
Exploration and Development Research Institute, PetroChina Jilin Oilfield Company, Songyuan, Jilin, 138000, China;
3.
College of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, Shaanxi, 710065, China

摘要

摘要: 为了提高强非均质性煤系致密砂岩储层裂缝识别效果，根据测井资料，利用动态弹性力学模型对该类储层进行裂缝预测。首先利用寻优算法及阵列声波测井资料获取岩石各模量参数，然后利用微分等效介质（DEM）理论模型计算岩石孔隙纵横比（α），进而对裂缝进行定量表征。单井裂缝预测结果与岩心裂缝实际发育情况的符合率较高，约为90%，表明利用DEM模型预测煤系致密砂岩储层裂缝的可靠性较高。在此基础上，根据测井资料，利用DEM模型对沁水盆地南部地区山西组Ⅱ砂组的裂缝平面分布进行了预测，裂缝预测结果与断裂性质、构造部位及岩心裂缝观察结果均较为吻合。研究表明，动态弹性力学模型适用于煤系致密砂岩储层的裂缝定量表征。
- 动态弹性力学模型 /
- 致密砂岩 /
- 裂缝预测 /
- 测井资料 /
- 沁水盆地
Abstract: In order to improve fracture identification for tight sandstone reservoirs with strong heterogeneity,the dynamic elastic mechanics theoretical model has been used with loggin data to predict fractures in tight reservoirs.First,the optimization algorithm and the array acoustic data were applied to obtain various modulus parameters of rocks,and then to calculate the rock pore aspect ratio (α) with the differential equivalent medium (DEM) theoretical model,so as to quantitatively characterize the fracture.Predictions of fractures in single wells achieved an accuracy level of 90% when predicted fractures were compared with actual.Such a high rate of coincidence between predicted and actual confirmed the reliability of DEM model in predicting fractures in coal-bearing tight sandstone reservoirs.Based on those results,the DEM model was used to predict the fracture plane distribution of the sand group Ⅱ of Shanxi Formation in the southern part of the Qinshui Basin based on well log data.Further,the fracture prediction results were consistent with fracture properties,structural locations and core fracture observations.The research showed that the dynamic elastic mechanics model was applicable to the quantitative characterization of fractures in coal-bearing sandstone reservoirs.
- dynamic elastic mechanics model /
- tight sandstone /
- fracture prediction /
- well logging data /
- Qinshui Basin

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