[1]石玉江,么勃卫,夏宏泉.致密油储层岩石各向异性的动态声学实验研究[J].测井技术,2019,43(03):228-234.[doi:10.16489/j.issn.1004-1338.2019.03.002]
 SHI Yujiang,YAO Bowei,XIA Hongquan.Experimental Study on Dynamic Acoustics of the Rock Anisotropy in Tight Oil Reservoir[J].WELL LOGGING TECHNOLOGY,2019,43(03):228-234.[doi:10.16489/j.issn.1004-1338.2019.03.002]
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致密油储层岩石各向异性的动态声学实验研究()
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《测井技术》[ISSN:1004-1338/CN:61-1223/TE]

卷:
第43卷
期数:
2019年03期
页码:
228-234
栏目:
实验研究
出版日期:
2019-08-30

文章信息/Info

Title:
Experimental Study on Dynamic Acoustics of the Rock Anisotropy in Tight Oil Reservoir
文章编号:
1004-1338(2019)03-0228-07
作者:
石玉江1 么勃卫2 夏宏泉2
(1.长庆油田分公司勘探开发研究院, 陕西 西安 710021; 2.西南石油大学油气藏地质及开发工程国家重点实验室, 四川 成都 610500)
Author(s):
SHI Yujiang1 YAO Bowei2 XIA Hongquan2
(1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710021, China; 2. State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China)
关键词:
实验研究 致密油储层 各向异性 声学速度 岩石力学 泊松比
Keywords:
experimental study tight oil reservoir anisotropy acoustic velocity rock mechanics Poisson's ratio
分类号:
P631.84
DOI:
10.16489/j.issn.1004-1338.2019.03.002
文献标志码:
A
摘要:
致密油储层具有明显的声速和力学各向异性特征,各向同性的动态声学和岩石力学评价方法对致密油储层存在明显的不适用性,因此开展岩石各向异性声学和力学实验研究。针对鄂尔多斯盆地陇东地区长6、长7和长8段致密油储层全直径岩心,进行多尺度多方位(0°,45°,60°,90°)钻取水平样和垂直样,对圆柱体岩样和方岩样进行常温常压下的声学参数测量,开展模拟地层条件下高温变围压的岩石声学参数测量。研究发现,取心角度和围压明显影响纵横波速度的大小,当取心角度由0°向90°变化,其波速逐渐减小,且当垂直样的纵波横波速度比小于21/2时,其动态泊松比为负值。另外,基于实验波速和密度值计算的刚度系数也表现出明显的各向异性特征,由此计算的泊松比和弹性模量较传统方法计算结果,更能反映低孔隙度低渗透率致密油储层的3D岩石力学各向异性。该实验结果为建立各向异性储层的动静态岩石力学参数转换模型和精准计算水平地应力提供了重要依据。
Abstract:
Tight oil reservoirs are characterized by obvious anisotropic acoustics and mechanics. Isotropic dynamic acoustics and mechanics evaluating methods are not applicable for tight oil reservoirs. It is necessary to carry out acoustic and mechanical experiments on rock anisotropy. Full-diameter, multi-sized and multi-azimuth cores(0°, 45°, 60°, 90°)were sampled from the tight oil reservoirs in Chang 6, Chang 7 and Chang 8 oil-bearing formations in Longdong, the Ordos Basin, including horizontal and vertical core samples. The cylindrical and square cores were measured by acoustic experiments at normal temperature and pressure, and then at downhole conditions(variable confining pressure and high temperature). The experiment results indicate that coring azimuth and confining pressure significantly affect the velocities of P wave and S wave. When the azimuth is from 0° to 90°, the velocity decreases gradually, and when the vp/vs ratio of the vertical sample is less than 21/2, the dynamic Poisson's ratio is negative. In addition, the stiffness coefficient calculated based on the experimental velocity and density is obviously anisotropic, and the Poisson's ratio and modulus of elasticity are better than those calculated by a traditional method, which can reflect the 3D mechanical anisotropy of the tight oil reservoir with low porosity and permeability. The experimental results provide an important basis for establishing dynamic and static mechanic parameter conversion models for anisotropic reservoirs and for accurately calculating horizontal stresses.

参考文献/References:

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备注/Memo

备注/Memo:
基金项目: 国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(2016ZX05050) 第一作者: 石玉江,男,1971年生,教授级高级工程师,博士,从事测井解释综合研究。E-mail:syj_cq@petrochina.com.cn 通讯作者: 么勃卫,男,1992年生,硕士研究生,从事岩石力学、偶极声波成像测井的精细解释及应用研究。E-mail:971500905@qq.com
更新日期/Last Update: 2019-08-30