Rock Physics and Petrographic Parameters Relationship Within Siliciclastic Rocks: Quartz Sandstone Outcrop Study Case

41st HAGI Annual Convention and Exhibition 2016

Syafriyono, S.^1 ; Caesario, D.^1 ; Swastika, A.^1 ; Adlan, Q.^1 ; Syafri, I.^2 ; Abdurrokhim, A.^2 ; Mardiana, U.^2 ; Mohamad, F.^2 ; Alfadli, M.K.^2 ; Sari, V.M.^3

PT FERG Geosains Indonesia, Cigadung Greenland, K55 Bandung

40191, Indonesia^1

Department of Geological Engineering, Padjadjaran University, Jl. Raya Bandung Sumedang KM 21, Jatinangor

45363, Indonesia^2

Department of Geophysical Engineering, Institute of Technology Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia^3

关键词: Compressional waves;    Depositional environment;    Parameters relationship;    Petrographic analysis;    Reservoir characteristic;    Reservoir characterization;    Reservoir conditions;    Siliciclastic rocks;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/132/1/012004/pdf
DOI  :  10.1088/1755-1315/132/1/012004

来源: IOP

【 摘 要 】

Rock physical parameters value (Vp and Vs) is one of fundamental aspects in reservoir characterization as a tool to detect rock heterogenity. Its response is depend on several reservoir conditions such as lithology, pressure and reservoir fluids. The value of Vp and Vs is controlled by grain contact and contact stiffness, a function of clay mineral content and porosity also affected by mineral composition. The study about Vp and Vs response within sandstone and its relationship with petrographic parameters has become important to define anisotrophy of reservoir characteristics distribution and could give a better understanding about local diagenesis that influence clastic reservoir properties. Petrographic analysis and Vp-Vs calculation was carried out to 12 core sample which is obtained by hand-drilling of the outcrop in Sukabumi area, West Java as a part of Bayah Formation. Data processing and interpretation of sedimentary vertical succession showing that this outcrop comprises of 3 major sandstone layers indicating fluvial depositional environment. As stated before, there are 4 petrographic parameters (sorting, roundness, clay mineral content, and grain contact) which are responsible to the differences of shear wave and compressional wave value in this outcrop. Lithology with poor-sorted and well-roundness has Vp value lower than well-sorted and poor-roundness (sub-Angular) grain. For the sample with high clay content, Vp value is ranging from 1681 to 2000 m/s and could be getting high until 2190 to 2714 m/s in low clay content sample even though the presence of clay minerals cannot be defined neither as matrix nor cement. The whole sample have suture grain contact indicating telogenesis regime whereas facies has no relationship with Vp and Vs value because of the different type of facies show similar petrographic parameters after diagenesis.