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Natural Gas Geoscience ›› 2019, Vol. 30 ›› Issue (9): 1332-1340.doi: 10.11764/j.issn.1672-1926.2019.05.024

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Application of 3D geological modeling in quantitative characterization of shale gas sweet spots: Case study of Zhaotong national demonstration area of Yangtze region

Lei-fu Zhang1,2,3(),Da-zhong Dong1,2,3(),Sha-sha Sun1,2,Rong-ze Yu1,2,Lin Li4,Shi-yao Lin5,Xiao-hu Ouyang6,Zhen-sheng Shi1,2,Jin Wu1,2,Yan Chang1,2,Chao Ma1,2,Ning Li1,2   

  1. 1. CNPC Research Institute of Petroleum Exploration and Development, Beijing 100083，China
    2. National Energy Shale Gas R & D (Experiment) Center, Langfang 065007, China
    3. CNPC Key Laboratory of Unconventional Oil and Gas, Langfang 065007, China
    4. CNPC Zhejiang Oilfield, Hangzhou 310023, China
    5. CNPC International Exploration and Production Corporation, Beijing 100086, China
    6. China Petroleum Pipeline Engineering Co. Ltd. , Langfang 065000, China
  • Received:2019-03-09 Revised:2019-05-30 Online:2019-09-10 Published:2019-10-14
  • Contact: Da-zhong Dong E-mail:zhangleifu@petrochina.com.cn.;ddz@petrochina.com.cn.

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Abstract:

Based on seismic interpretation, drilling data, well logging data, and prior geological knowledge, taking the Zhaotong shale gas National Demonstration Area as a research target, using the three-dimensional modeling software PetrelTM, three-dimensional reservoir models covering the TOC, porosity, gas saturation, gas content, brittleness index and other properties have been built. Free gas resources are calculated using PetrelTM built-in modules. Adsorption gas resources are calculated according to the volumetric method. The overall shale gas resources are estimated to be more than 1 000×108m3, in good accordance with the EUR forecasts. The CNPC sweet spot evaluation standard is applied to filter all the grids in the 3D property models, so that sweet spot layers in the research area can be quantitatively evaluated and sweet spot body can be quantitatively characterized in 3D. Such results can provide guidance for shale gas reservoir development plan, which serve as the priority among all priorities for the geology-engineering integration practice.

Key words: Zhaotong national shale gas demonstration area, 3D geological modeling, Shale gas sweet spot, Quantitative characterization

CLC Number: 

  • TE122.2

Fig.1

Location of study area and stratigraphic division of the target horizon"

Fig.2

3-D effective porosity model of the study area（number1-9 represents different wells）"

Fig.3

Property model and cross-well profile"

Fig.4

Distribution of critical properties used for calculating shale gas resouces"

Table 1

Parameter standard for high-quality reservoir"

参数 Ⅰ类 Ⅱ类 非I+II类
TOC/% ≥3 2-3 ≤2
孔隙度/% ≥5 3~5 ≤3
脆性指数/% ≥55 45~55 ≤45
含气量 GIPSG/(m3/t) ≥3 2~3 ≤2

Fig.5

Distribution of high-quality reservoir of the study area"

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