zahir shah’s Post

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

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.

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

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

Better Visualization Comes with 3D Geological Models! ⛏️ At Define Geographic's, we specialise in creating high-quality 3D models that bring complex features, like the ephemeral system in our picture, to life! ️ These models aren't just pretty pictures - they offer a wealth of information: - See the bigger picture: Understand how ephemeral features like streams and sand dunes interact and impact your subsurface environment. - Communicate clearly: Share insights with stakeholders in a way everyone can understand. Make informed decisions: Improve conceptual reservoir analysis, wellbore planning, and resource exploration. We use a variety of data sources to craft our own 3D models, including: - Well logs ⚡ - Seismic data 📍 - Outcrop data ⛰️ See below for a 3D geological model produced by one of the Define Geo Team! Get in touch today and let's transform your data into a powerful visualization tool! Website Link ➡️ https://lnkd.in/gtybpR5V Send us a DM 💬 #geology #3Dmodeling #subsurfacevisualization #ephemeralsystems #geotechnicalengineering Reference - Priddy & Clarke 2020 Priddy, C.L. and Clarke, S.M., 2020. The sedimentology of an ephemeral fluvial–aeolian succession. Sedimentology, 67(5), pp.2392-2425.

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

⚠ The importance of consider different geological models for the same seismic response The Endurance structure, located in the Southern North Sea, is one of several saline aquifer structures that have been identified as potential storage for CCUS. The structure is water-bearing but presents a seismic phase inversion (figure) downdip of the crest. I can easily imagine that this seismic phase inversion could be interpreted as a DHI if the structure was not tested by an exploration well. What is the origin of this seismic phase reverse? Model 1 A seismic phase reversal correlates to the presence of a tightly halite cemented zone at the top of the Bunter Sandstone (Furnival, et al., 2013). Wells on the crest contain reservoir sandstones which are less cemented with average porosity of 25% whilst wells on the flank of the structure with sandstones being more tightly cemented, degrading porosity at top of the reservoir and average porosity of 10% . The less cemented Bunter sandstones are represented seismically by a trough (decrease AI) whilst the cemented sandstones exhibit as a peak (increase AI). When Bunter sandstones become cemented with “fast halite” rather than being water filled, the porosity is reduced, making the rock acoustically hard (sonic velocity increase respect to the overlying sealing claystones) causing the seismic phase to flip from a trough to a peak. The presence of halite cements in the Bunter Sandstones is well documented, however the regional distribution and the causes of these cements are not as well understood. Model 2 The seismic phase reverse is the representation of a paleo contact. Maybe, there used to be gas in the structure but that had spilled due to tilting or breach of the structure and the gas has migrated out. The water then moves up into the crest of the structure, but there is neither sufficient time, nor sufficient fluid flux to further cement the reservoir, hence preservation of the porosity above the paleo GWC. Something to take in consideration is that the seismic phase reversal contact does not exhibit 100% conformance with the structure. ❓ Are there more possible models? Which is the correct model? 🤷♀️ WHO KNOWS but the important thing is considerer multiple models and their implications. #geophysic

⛰ From Rock Cores to Roadmaps: Simplifying Geological Data for Stakeholders 🚓 All too often, geologists either don't have the skillset or the time to deliver accurate drafts and this key step in the subsurface workflow is overlooked. We see presentations full of poorly crafted images and inaccurate representations of the subsurface on a day-to-day basis - this is why Geo's are poorly understood. Our job as geoscientists is not only to interpret and represent the secrets beneath our feet, but also to depict our ideas in a digestible way to educate our management, colleagues, and the public. If you are looking to get your projects/prospects through a tricky peer review process, present a farm-out agreement, or inform the public about a specific geological issue, your material needs to follow these three KEY rules: - Be Clear: Clarity is the key to communication. 🔮 - Be Memorable: Make your images memorable to improve credibility and your chances of success. 🧠 -Be Concise: Ensure your story is concise to retain attention. ⏩ Below is an example of a sedimentary log showing the interpreted lithofacies as well as paleocurrents, illustrating the changing facies throughout the Kayenta Formation from the Colorado Plateau, USA (courtesy of Priddy & Clarke 2020). Reference: Priddy, C.L. and Clarke, S.M., 2020. The sedimentology of an ephemeral fluvial–aeolian succession. Sedimentology, 67(5), pp.2392-2425. #corelogs #coreinterpretation #core #stratigraphiclogs #stratigraphy #SeismicInterpretation #GeologicalDrafting #BridgingTheGap #SubsurfaceDrafting #OilandGasExploration #MiningIndustry #GeoscienceSolutions #SubsurfaceMapping #GeologicalVisualization #DraftingExperts #OilandGasServices #MiningSolutions  #GeologicalInsights #SubsurfaceMapping #GeotechnicalDrafting #OilandGasTech #MiningTech #GeologicalData #PrecisionDrafting #GeologicalMapping #SubsurfaceTechnology #OilandGasInnovation Define Geo Website —> https://lnkd.in/gtybpR5V

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

Some people have asked me about the specific bands used for each mineral index in the app developed with the ASTER collection. For a detailed understanding, I recommend reading the publication by my colleague Rodrigo Brust Santos. In this work, he not only addresses the indices from the ASTER sensor but also explores indices from other satellites that are widely discussed in academic literature. Check it out to deepen your knowledge in remote sensing applications in geology!