檀文慧^1,2,,
巴晶^1,,,
符力耘³,
José M. Carcione^1,4,
周欣¹
1. 河海大学地球科学与工程学院, 地球探测研究所, 南京 211100
2. 中国石化石油物探技术研究院, 南京 211103
3. 中国石油大学(华东), 地球科学与技术学院, 山东青岛 266580
4. National Institute of Oceanography and Applied Geophysics (OGS), Trieste, Italy

基金项目: 国家自然科学基金项目（41974123），江苏省双创计划，江苏省****基金项目，国家科技重大专项课题（2017ZX05069-002）资助


详细信息

作者简介: 檀文慧, 女, 1991年生, 博士, 工程师, 主要从事致密油气储层岩石物理模型及脆性特征研究.E-mail: twh@hhu.edu.cn

通讯作者: 巴晶, 男, 1980年生, 博士, 河海大学教授, 主要从事孔隙介质波传播理论、岩石物理学和储层流体地震检测方法研究.E-mail: jba@hhu.edu.cn

中图分类号: P631

收稿日期:2020-10-09
修回日期:2021-04-15
上线日期:2021-08-10

3D rock physics template analysis and "sweet spot" prediction of Longmaxi-Wufeng organic-rich shale

TAN WenHui^1,2,,
BA Jing^1,,,
FU LiYun³,
José M. Carcione^1,4,
ZHOU Xin¹
1. School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
2. Sinopec Geophysical Research Institute, Nanjing 211103, China
3. School of Geosciences, China University of Petroleum(East China), Qingdao Shandong 266580, China
4. National Institute of Oceanography and Applied Geophysics(OGS), Trieste, Italy


More Information

Corresponding author: BA Jing,E-mail:jba@hhu.edu.cn

MSC: P631

--> Received Date: 09 October 2020
Revised Date: 15 April 2021
Available Online: 10 August 2021


摘要
摘要:为识别四川盆地丁山区龙马溪-五峰组目的层富含页岩气的"甜点区"，本文对页岩的有机碳含量、脆性、孔隙度及微裂隙等核心指标进行分析研究.对页岩展开岩石物性特征和岩石物理分析，结果显示"甜点区"具有TOC含量高、高孔隙度、低密度、脆性高（石英含量高）的特点，此外储层的拉梅常数和密度的乘积λρ分布范围是18~30 GPa·g·cm^-3，泊松比υ范围是0.18~0.22，剪切模量μ范围是13~18 GPa.根据储层的岩石物理特征，同时考虑孔隙度、裂隙纵横比和矿物组分对优质页岩敏感弹性参数的影响，采用等效嵌入体应力平均（EIAS）理论模型构建适合页岩气储层的三维岩石物理模板，进而预测储层的孔隙度、裂隙纵横比和石英矿物含量.基于测井数据，对构建的三维岩石物理模板进行校正，将校正后的模板应用到研究工区，选取过三口井的二维测线和三维区块，进行孔隙度、裂隙纵横比和石英矿物含量的定量预测.对比实际资料分析得出的优质页岩储层孔隙度预测范围与测井结果吻合较好，过三口井的目的层产气情况与预测结果一致性良好，目的层页岩具有高孔隙度、低裂隙纵横比和高石英含量的特征，可有效地指示优质页岩储层分布.
关键词: 页岩气/
有机碳含量/
脆性/
孔隙度/
"甜点"预测/
岩石物理模板

Abstract:For the purpose of identifying the "sweet spots" of rich shale gas in the Longmaxi-Wufeng target Formations of Dingshan area of Sichuan Basin, this work investigates the key indexes of shale, such as content of total organic carbon (TOC), brittleness, porosity, microfractures, etc. We analyze on the rock characteristics and perform rock physics analysis, and the results show that the sweet spot areas exhibit high TOC, high porosity, low density and high brittleness (high quartz content). Furthermore, λρ (product of the first Lamé constant and density) ranges in 18~30 GPa·g·cm^-3, Poisson's ratio υ ranges in 0.18~0.22, and shear modulus μ ranges in 13~18 GPa for those reservoirs. According to the rock physics properties of reservoir, by considering the impact of porosity, crack aspect ratio and mineral components on the sensitive elastic parameters of high-quality shales, EIAS (equivalent inclusion-average stress) model is adopted to establish 3D rock physical templates for shales, and the reservoir porosity, crack aspect ratio and quartz content are predicted. Based on the log data, the constructed 3D rock physics templates are calibrated, and the calibrated templates are applied to the work area. For the 2D seismic test lines (crossing the three wells) and a 3D seismic dataset, porosity, crack aspect ratio, and quartz content are quantitatively estimated. Compared to the actual data analysis, it is concluded that the range of the predicted porosity for high-quality shale reservoirs are in good agreement with the log data. The gas production data for the target layer of the three Wells are consistent with predictions. The characteristics of high porosity, low crack aspect ratio, and high quartz content of rocks of target formation effectively indicate the spatial distribution of high-quality shale reservoirs.
Key words:Shale gas/
Content of total organic carbon (TOC)/
Brittleness/
Porosity/
Sweet spot prediction/
Rock physics template



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