Controlling factors of acoustic properties in continental carbonates: Implications for high-resolution seismic imaging

نویسندگان

چکیده

Continental carbonates are characterized by multi-scale heterogeneous porous networks, making the geological interpretation of seismic imaging difficult. We investigate two sedimentary sections exhibiting a similar facies succession, combining characterizations and acoustic measurements. Based on outcrop investigation petrographic description, we define nine displaying contrasted early diagenetic evolutions. According to vertical variations, develop depositional model corresponding low gradient valley fed freshwaters, subdivided into three main domains (alluvial plain, palustrine paludal). To understand properties studied rocks while remaining representative their heterogeneity, acquire measurements at different scales: i) log-scale, directly surfaces using frequency 250 kHz; ii) plug-scale as usually done in laboratory 500 kHz. these geophysical acquisitions, link in-situ P-wave velocities with characterizing centimeter-scale Representative Elementary Volumes (REVs). Conversely, based thin-section petrography, relationships between velocity, porosity, facies, diagenesis, millimeter-scale REVs. Using both velocity plug densities, construct 1-D synthetic seismograms showing meter-scale reflectors equivalent crosswell ranges. This approach shows following: high-amplitude fit changes associated contrasts (e.g. cemented versus uncemented carbonates); reflection free-zones match succession affected homogenization intensely pervasively recrystallized carbonates). Our work highlights importance relating an extensive description (facies, model, diagenesis) together modelling predict high-resolution heterogeneities subsurface reservoirs.

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ژورنال

عنوان ژورنال: Marine and Petroleum Geology

سال: 2022

ISSN: ['0264-8172', '1873-4073']

DOI: https://doi.org/10.1016/j.marpetgeo.2021.105518