基于声学数据反演定量评价致密砂岩储层微裂隙应力敏感性新方法

doi:10.16285/j.rsm.2017.02.014

›› 2017, Vol. 38 ›› Issue (2): 409-418.doi: 10.16285/j.rsm.2017.02.014

基于声学数据反演定量评价致密砂岩储层微裂隙应力敏感性新方法

尹帅^{1, 2, 3}，丁文龙^{1, 2, 3}，单钰铭⁴，周文⁴，谢润成⁴

1. 中国地质大学能源学院，北京 100083；2. 中国地质大学海相储层演化与油气富集机理教育部重点实验室，北京 100083； 3. 中国地质大学页岩气资源战略评价国土资源部重点实验室，北京 100083； 4. 成都理工大学油气藏地质及开发工程国家重点实验室，四川成都 610059

收稿日期:2015-05-26 出版日期:2017-02-11 发布日期:2018-06-05
通讯作者: 丁文龙，男，1965年生，教授，博士后，博士生导师，长期从事石油构造分析与控油作用、非常规油气构造和裂缝及其与含气量关系等方面的教学与科研工作。E-mail: dingwenlong2006@126.com E-mail: speedysys@163.com
作者简介:尹帅，男，1989年生，博士研究生，主要从事石油构造分析与控油作用、非常规油气构造和裂缝及其与含气量关系研究
基金资助:
国家自然科学基金项目（No. 41572130，No. 41372139，No. 41072098）；国家科技重大专项专题（No.2016ZX05046-003-001，No. 2011ZX05018-001-002，No.2011ZX05009-002-205，No. 2011ZX05033-004）。

A new method for quantitative evaluation of microcrack stress sensitivity of tight sandstone reservoir based on inversion of acoustic data

YIN Shuai^{1, 2, 3}, DING Wen-long^{1, 2, 3}, SHAN Yu-ming⁴, ZHOU Wen⁴, XIE Run-cheng⁴

1. School of Energy Resources, China University of Geosciences, Beijing 100083, China; 2. Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism of Ministry of Education, China University of Geosciences, Beijing 100083, China; 3. Key Laboratory for Shale Gas Exploitation and Assessment of Ministry of Land and Resources, China University of Geosciences, Beijing 100083, China; 4. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu University of Technology, Chengdu, Sichuan 610059, China

Received:2015-05-26 Online:2017-02-11 Published:2018-06-05
Supported by:
This work was supported by the National Natural Science Foundation of China(41572130, 41372139, 41072098) and the National Science and Technology Major Project of China (2016ZX05046-003-001, 2011ZX05018-001-002, 2011ZX05009-002-205, 2011ZX05033-004).

摘要/Abstract

摘要： 设计试验方法流程对塔中地区深层致密砂岩储层岩样进行不同围压条件下声学测试，提出基于声学数据反演定量研究致密砂岩储层微裂隙应力敏感性的评价方法。通过Biot相洽理论和DEM理论组合模型分别对岩石裂隙密度和孔隙纵横比进行反演，探讨了不同围压条件下岩石、的变化规律，并对微裂隙应力敏感性进行评价。结果表明：随围压的增加而降低，随围压的增加而增加，这主要是由于微裂隙的闭合引起的；根据不同围压条件下值降低幅度可以确定发生闭合的裂隙或依然保持张开的裂隙所占的百分比；在较高围压条件下依然具有较大值的样品应力敏感性较弱，反之，应力敏感性较强；定义试验中岩石内部孔裂隙性质发生急剧变化的点为转折点，发现该点对应的值相差不大，该值可视为该致密砂岩储层的裂隙共性特征，并可作为裂隙相对发育程度的对比指标；分别探讨了值（围压65 MPa）及所定义转折压力与岩石孔隙度间的相关性，结果表明，两者正相关性均非常好，对于该地区深层低渗致密砂岩储层而言，存在低应力敏感性的有利类型裂隙受岩石物理性质影响程度最大。

关键词: 塔中地区, 声学, 反演, 致密砂岩储层, 微裂隙, 应力敏感性

Abstract: Acoustics tests are conducted on deep tight sandstone reservoir samples in Tazhong area. A new method is developed for quantitatively evaluating the microcrack stress sensitivity of tight sandstone reservoir using inversion of acoustic data. The fracture density and the aspect ratio are inversed by using the Biot consistent model and the DEM model, and the variations of and are discussed under different confining pressures. The stress sensitivity of microfractures are also evaluated. The results show that, with the increase of confining pressure, decreases and increases, mainly due to the closing of the microfracture. According to the reducing amplitude of under different confining pressures, the percentage of fractures that close or open can be determined. Samples with a larger under high confining pressure represent low stress sensitivity. Otherwise, the stress sensitivity is higher. This paper defines the point, where the pore-fracture in the rock changes greatly, as the turning point. The values of corresponding to the turning points of different samples are similar. This phenomenon can be seen as the common characteristics of tight sandstone reservoir fractures, and it can also act as the contrast indicator of the fracture development degree. The correlations of (with a confining pressure of 65 MPa) and turning pressure with rock porosity are discussed, which shows that they both have a very good positive correlation. For the deep low permeability sandstone reservoir in this region, the favorable fracture that has weak stress sensitivity is influenced mostly by physical properties of rock.

Key words: Tazhong area, acoustics, inversion, tight sandstone reservoir, microcrack, stress sensitivity

中图分类号:

P 554

尹帅，丁文龙，单钰铭，周文，谢润成,. 基于声学数据反演定量评价致密砂岩储层微裂隙应力敏感性新方法[J]. , 2017, 38(2): 409-418.

YIN Shuai, DING Wen-long, SHAN Yu-ming, ZHOU Wen, XIE Run-cheng,. A new method for quantitative evaluation of microcrack stress sensitivity of tight sandstone reservoir based on inversion of acoustic data[J]. , 2017, 38(2): 409-418.

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基于声学数据反演定量评价致密砂岩储层微裂隙应力敏感性新方法

A new method for quantitative evaluation of microcrack stress sensitivity of tight sandstone reservoir based on inversion of acoustic data

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