Duvernay shale lithofacies distribution analysis in the West Canadian Sedimentary Basin

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Zhu, Houqin^1 ; Kong, Xiangwen^1 ; Long, Huashan^2 ; Huai, Yinchao^3

Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China^1

JiDong Oilfield Company, CNPC, Tangshan, Hebei, China^2

School of Earth Science and Resources, Chang'An University, Xi'an, China^3

关键词: Distribution analysis;    Energy dispersive spectrometers;    Horizontal distribution;    Lithofacies analysis;    Photoelectric absorption;    Reservoir property;    Rock physics model;    Sedimentary basin;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/5/052007/pdf
DOI  :  10.1088/1755-1315/121/5/052007

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In the West Canadian Sedimentary Basin (WCSB), Duvernay shale is considered to contribute most of the Canadian shale gas reserve and production. According to global shale gas exploration and development practice, reservoir property and well completion quality are the two key factors determining the shale gas economics. The two key factors are strongly depending on shale lithofacies. On the basis of inorganic mineralogy theory, all available thin section, X-ray diffraction, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) data were used to assist lithofacies analysis. Gamma ray (GR), acoustic (AC), bulk density (RHOB), neutron porosity (NPHI) and photoelectric absorption cross-section index (PE) were selected for log response analysis of various minerals. Reservoir representative equation was created constrained by quantitative core analysis results, and matrix mineral percentage of quartz, carbonate, feldspar and pyrite were calculated to classify shale lithofacies. Considering the horizontal continuity of seismic data, rock physics model was built, and acoustic impedance integrated with core data and log data was used to predict the horizontal distribution of different lithofacies. The results indicate that: (1) nine lithofacies can be categorized in Duvernay shale, (2) the horizontal distribution of different lithofacies is quite diversified, siliceous shale mainly occurs in Simonette area, calcareous shale is prone to develop in the vicinity of reef, while calcareous-siliceous shale dominates in Willesdon Green area.