zahir shah’s Post

I often use the principals of fractal geology to define the structural style of an area

A lot of comments on this post about a thin section. Many draw the conclusion that it preserves delicate sedimentary layering, an unconformity, and brittle fault arrays. My interpretation: this is a crenulated graphitic schist. It probably formed at intermediate metamorphic pressures and temperatures. It presumably had a carbonaceous protolith and compositional layering is likely to reflect primary bedding. Apart from these remnants of it’s pre-metamorphic origins, I see no indications of the macroscopic sedimentary features described by other commenters. While I can see the resemblance to such macro features, I think this is pure coincidence. Importantly, we have no way of knowing the true orientation of this thin section. Flip sideways and the resemblance diminishes. I’m interested in the views of the brains trust.. Is this a ‘white dress/blue dress’ situation? It is a beautiful slide nonetheless.

As a structural geologist, this thin section stands out as one of the most remarkable samples I’ve encountered. 🤩 It serves as a perfect micro-representation of the cross sections we analyze on a larger scale. The folds, fractures, and intricate structural details captured here reflect the same processes we observe in outcrops and subsurface geological formations. This sample demonstrates how the forces shaping our planet operate seamlessly across different scales, from microscopic thin sections to vast tectonic regions. By examining such thin sections, we can better connect our lab work to real-world geological mapping, enhancing our ability to interpret subsurface structures with greater accuracy. #StructuralGeology #Geoscience #Petrography #ThinSection #GeologicalMapping #GeologyInDetail #VancouverPetrographics

Constraining geological models with production data is becoming a reality. We are laying the foundation by adding production-based constraints to our Constrained Forward Stratigraphic Modeling method. We added pressure-based flow barrier interpretation constraints and boundary constraints from the interpretation of well tests with boundary effects. This small step allows the creation of a geological model that honors the radius of investigation of well-test data, adding to the set of multi-scale constraints. There is much more data to use, and we welcome any challenges or tests with geology and production data. Thanks in advance for your collaboration. The diagram below shows how each input data type (geology, seismic, production) defines specific constraints to the processes, objects, and surfaces involved in the modeling. Thanks again for your continued support. #geologicalmodeling, #reservoirmodeling

Understanding Seismic Data Interpretation This image presents a classification of seismic facies and their associated reflection attributes. Seismic Facies and Reflection Attributes: 👉Facies A: -External Geometry: Sheet to wedge. -Internal Configuration: Parallel to wavy. -Continuity: High. -Amplitude Strength: Moderate to high. 👉Facies B: -External Geometry: Sheet to wedge. -Internal Configuration: Parallel to wavy. -Continuity: Semi-continuous to high. -Amplitude Strength: Low to moderate. 👉Facies C: -External Geometry: Sheet to mound. -Internal Configuration: Wavy to hummocky. -Continuity: Disrupted to discontinuous. -Amplitude Strength: Moderate to high. 👉Facies D: -External Geometry: Sheet to wedge. -Internal Configuration: Parallel to subparallel. -Continuity: Semi-continuous to disrupted. -Amplitude Strength: Low to moderate. 👉Facies E: -External Geometry: Lens to wedge. -Internal Configuration: Subparallel to convergent to oblique. -Continuity: Semi-continuous to high. -Amplitude Strength: Low to moderate. 👉Facies F: -External Geometry: Lens to channel-shaped. -Internal Configuration: Wavy to chaotic. -Continuity: Discontinuous. -Amplitude Strength: Low to moderate. 👉Interpretation: The chart categorizes different seismic facies based on the reflection attributes, which include geometry (shape), internal configuration (arrangement of reflections), continuity (how consistent the reflections are), and amplitude strength (signal intensity). These characteristics are used in geological interpretation to understand subsurface structures, sedimentary environments, and stratigraphic patterns. # oilandgasindustry #drillingengineering #exploration #reservoir #geology #geophysics #petrel #software #installation #wells #seismicdata

Take part in our course on Structural Geology and GIS for Mineral Exploration. This course combines core principles of structural geology with advanced 2D and 3D GIS workflows, integrating tectonic, geophysical, geochemical, and metallogenic concepts for mineral deposit targeting. The focus is on analyzing fault and fracture systems, examining their architecture, kinematics, development, association with magmatism, and their influence on mineralization across scales. For details and registration, visit https://lnkd.in/gcZN-wP2 or contact me directly. #StructuralGeology #MineralExploration #GIS

Geological maps are essential tools in geology used to represent rocks and geological features on the Earth's surface. These maps provide an accurate depiction of the distribution of different types of rocks, geological structures such as faults and folds, and display related topographical and geomorphological features. Geological maps are indispensable for geologists and researchers in fields such as natural resource exploration (e.g., oil, gas, and minerals), understanding earthquakes and volcanoes, and assessing environmental hazards. They help identify and map the locations and distribution of mineral deposits and aid in planning urban development safely, away from geologically hazardous areas. They are also used in geotechnical engineering for constructing major structures, such as dams and tunnels, ensuring infrastructure stability. There are various types of geological maps based on their usage: 1. Geological topographic maps: Combine geological and topographic information, allowing for an understanding of how geology interacts with the terrain. 2. Structural geological maps: Focus on representing folds, faults, and fractures, aiding in understanding the formation of the Earth over geological time. 3. Geological time maps: Represent the dates and ages of rock layers according to geological periods, which helps in studying geological evolution. 4. Natural resource maps: Show areas where resources such as oil, minerals, and groundwater are located. 5. Tectonic maps: Display the boundaries of tectonic plates and areas of seismic and volcanic activity. These maps require precise analysis of field geological data and contribute to making important decisions across various fields. Their use is fundamental to developing strategies for managing natural resources, protecting the environment, and understanding Earth's history and evolution. #maps #geology #Life #Earth

The Geophysical Gravity/Microgravity method The gravity method measures the gravitational attraction exerted by the Earth at a specific station on its surface. The strength of this gravitational field is directly proportional to the mass and, consequently, the density of subsurface materials. Variations in the Earth's gravitational field, known as anomalies, are caused by lateral changes in the density of these subsurface materials. These anomalies arise from the superimposition of the gravitational force due to buried mass differences in the larger gravitational force exerted by the entire mass of the Earth. Therefore, at the Earth's surface, two components of gravitational forces are measured: a general, relatively uniform. The SCINTREX CG-6 Autograv underwent a 9-hour stabilization period before field use. Field calibration was performed on the instrument and consisted of a long-term drift correction and temperature compensation adjustment. The following corrections were calculated for each gravity measurement: Drift Correction, Latitude Correction, Free-Air Correction, Bouguer Correction and Terrain Correction. A base station was established at the survey site, and gravity was repeatedly measured at this base station approximately every hour to derive instrument drift. A base station-derived instrument drift curve was interpolated to the time of each survey station reading, and each station reading was then corrected for instrument drift by the Geosoft OASIS Montaj program. Application of gravity method: *Hydrocarbon exploration. *Geology and structure geology studies. *Detection of sub-surface cavities. *Location of the buried rock/valleys. 

The procedure for seismic data interpretation can be summarized as follows 📈📊📉 1) Collect the main input which are the processed seismic and well data. The seismic data can be post and/or pre-stack data, depending on the purpose of the study. The most important well data are check-shot, sonic log and density log. 2) Set the objectives and the target interval of the study The common objective is to get the following information/model for the studied interval: a. Time and/or depth structure b. Facies and/or depositional system c. Physical properties (porosity, sand/shale, pore-fluid saturation, etc) 3) Understand the geology of the studied interval, especially the related tectonic, basin evolution, structure and stratigraphy. 4) Acquire basic rock-physics knowledge to understand the relations between the physical properties of rock targets and the seismic properties. 5) Determine polarity, phase and resolution of the seismic record. 6) Tie the seismic with the well and understand the geological (lithology, thickness, porosity, pore-fluid type, vertical and lateral distribution, etc.) and geophysical (velocity, density, gamma ray/SP response, etc.) characteristics of the target. 7) When necessary do forward modeling and target response evaluation: a. Forward modeling to model the seismic response of a certain geological model. b. Backward modeling to infer the geological meaning of seismic response. 8) Determine and understand the noise of the seismic data and their associated interpretation pitfalls. 9) Do geological interpretation of the seismic data to achieve the objectives. Depending on the objectives, the product of the interpretation can be the models / maps of the target structure in time and/or depth, its facies and depositional system, and physical properties. 10) When necessary use sequence seismic stratigraphy and advance methods such as seismic inversion and seismic attributes analysis to achieve the objectives #SeismicInterpretation #Geophysics #Geology #OilAndGas #Exploration

🚢🔍 Unlocking the Secrets of the Seabed with Sub-Bottom Profiling! 🔍🚢 🌊 Ever wondered what's beneath the ocean floor? In #2017, our Marine Research team embarked on an important mission using the sophisticated Exail #iXBlue #ECHOES10000 Sub-Bottom Profiler. Our objective was to meticulously map the seabed layers for a challenging dredging project. As seen in the profile image below, we thoroughly mapped out various layers, including muddy sands, sands, and extensive mud deposits. Here's a glimpse into what we discovered: 🌊 Muddy Sand: Sitting atop, this layer showcases a fascinating mix of sand and mud, hinting at the dynamic processes shaping our seabed. 🏖️ Sand Layers: We identified distinct sand formations, albeit with some uncertainty. These insights are crucial for understanding sediment transport and deposition patterns. 🛠️ Mud Deposits: Predominant in the subsurface, these layers provide essential information for assessing the seabed's stability and suitability for dredging activities. 📏 Layer Thickness: Using geotechnical sampling data and sound velocity measurements, we accurately determined the thickness of each layer, ensuring precise planning for our project. Our sub-bottom profiling efforts not only supported the dredging project but also enhanced our understanding of the seabed's geological history. This knowledge is invaluable for environmental conservation, resource exploration, and future marine projects. The collaboration and dedication of our team, combined with modern technology, continue to push the boundaries of marine research. 🌐🔬 Curious to learn more about our findings and the technologies we use? Let's connect and dive deeper into the fascinating world of marine geophysics! #MarineResearch #SubBottomProfiling #DredgingProject #SBP #GeotechnicalSurvey #SeabedLayers #iXBlueECHOES10000 #MarineGeophysics #OceanExploration #SeafloorMapping #MarineScience #UnderwaterTechnology #EnvironmentalResearch #CoastalEngineering #MarineInnovation #SeabedAnalysis #Hydrography #MarineSurveying #SeabedGeology #MarineTechnology #ProjectManagement #OceanFloor #MuddySand