January 24, 2022

Fracture Swarms vs Diffuse Fractures

January 24, 2022

Here we look at two broad categories of natural fractures which are very useful to consider when characterising naturally fractured reservoirs in the subsurface. These are diffuse fractures and fracture swarms.

Steven Ogilvie

November 17, 2021

Folds, Azerbaijan

Asymmetrical folds, Candy Cane Mtns, Azerbaijan.

Steven Ogilvie

November 17, 2021

Folds, Azerbaijan

Asymmetrical folds, Candy Cane Mtns, Azerbaijan.

Here we look at an evolution of styles of asymmetrical folds in an area locally known as Candy Mountain, Azerbaijan.

Steven Ogilvie

November 2, 2021

Shear zone

Veins as Shear Indicators

Steven Ogilvie

November 2, 2021

Shear zone

Veins are useful indicators of the sense of shear - here we look at some calcite veins in limestone in Oman which have a sigmoidal geometry in places and indicate a sinistral sense of shear.

Steven Ogilvie

October 7, 2021

joints

Exfoliation joints, Oman

Steven Ogilvie

October 7, 2021

joints

Here, we look at a type of exhumation fracture called an exfoliation joint with examples in limestones from the Al Hajar Mountains in Oman.

Steven Ogilvie

October 5, 2021

Folds, Faults, Scotland, Stonehaven

Steeply Dipping Beds, Stonehaven, UK

Steven Ogilvie

October 5, 2021

Folds, Faults, Scotland, Stonehaven

Here we look at near vertical beds in the foreshore just N of Stonehaven, UK. It is likely that movement along the HBF is responsible.

Steven Ogilvie

September 20, 2021

Fault Framework, Faults, Folds, Seismic interpretation

Impact of Relay Ramps

Steven Ogilvie

September 20, 2021

Fault Framework, Faults, Folds, Seismic interpretation

Relay ramps can create communication between fault blocks during an oil field development. Here we look at some examples and other types of segmentation which occur in weaker rocks.

Steven Ogilvie

September 9, 2021

In-situ Stress

Insitu Stress - Shmax Orientation

Steven Ogilvie

September 9, 2021

In-situ Stress

Understanding the orientation of Shmax is key to many aspects of field development such as optimal drilling direction (fractured reservoirs). Here, we look at various ways to derived the orientation of Shmax.

Steven Ogilvie

August 24, 2021

Deformation Bands, Faults

Joints breaching the sealing fault ?

Steven Ogilvie

August 24, 2021

Deformation Bands, Faults

Can joints concentrated in zones of stronger deformation bands (compared to weak sandstones) compromise the seals ?

Analogous to mechanical stratigraphy in a sedimentary sequence ?

Steven Ogilvie

August 5, 2021

Faults, Fractured Basement

Fault Block Rotation, Rona Ridge

Steven Ogilvie

August 5, 2021

Faults, Fractured Basement

Low angle faults usually do not form directly - here we look at a fault block rotation model in the Rona Ridge, WOS.

Steven Ogilvie

June 22, 2021

Faults, Fault Framework

Change in fault dip

Steven Ogilvie

June 22, 2021

Faults, Fault Framework

Seismic and outcrop examples of faults changing dip as they are traced through different lithologies

Steven Ogilvie

May 27, 2021

Carbonates, Faults, Fractures

Sheet Model for Karst Fractures

Steven Ogilvie

May 27, 2021

Carbonates, Faults, Fractures

Demo of how to calculate fracture porosity and permeability of the network shown using a simple sheet model

Steven Ogilvie

April 19, 2021

Faults, Folds, sandstones

Fractured & Folded Devonian Sandstones, Caithness

Steven Ogilvie

April 19, 2021

Faults, Folds, sandstones

Fractured & Folded Devonian Sandstones, Caithness

Here, we have a look at some naturally fractured sandstone outcrops in Caithness Scotland which are an analogue for the giant Clair Field, West of Shetland.

Steven Ogilvie

April 12, 2021

Fractures, Faults

Natural vs. Induced fractures in core

Steven Ogilvie

April 12, 2021

Fractures, Faults

$Natural vs. Induced fractures in core$

Here’s my criteria for identifying natural vs. induced fractures in rock core.

Steven Ogilvie

February 20, 2021

Faults, Fault Framework, Mudstone

Imaging a Fault in Valhall Field

Steven Ogilvie

February 20, 2021

Faults, Fault Framework, Mudstone

Here we present an integrated characterisation of a fault zone in mudstones (from the Valhall Field, Central N Sea) using log and core data from a single well.

Steven Ogilvie

September 9, 2020

Faults, Fractures, Mudstone

Natural Fractures in Mudstone

Steven Ogilvie

September 9, 2020

Faults, Fractures, Mudstone

Pink (Devonian age) mudstones on the bank of the River Tay (Perthshire, UK) are intensively fractured - including joints and larger through going fractures Here we look at some of their characteristics including some splaying geometries.

Steven Ogilvie

July 17, 2020

Instagram

Steven Ogilvie

July 17, 2020

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Steven Ogilvie

July 6, 2020

Faults, Fault Framework

Anderson's Model of Faulting

Steven Ogilvie

July 6, 2020

Faults, Fault Framework

These conjugate normal faults are found in the Permo-Trias Hopeman Sandstone, Inner Moray Firth, UK. Here we look at these within the context of Anderson’s model and what it means when for example interpreting seismic data.

Steven Ogilvie

June 2, 2020

Fractures

Concretion-related fractures

Steven Ogilvie

June 2, 2020

Fractures

$Concretion-related fractures$

Carbonate nodules in mudstones, can provide valuable insights into geological history - here we look at some examples from the North Sea.

Steven Ogilvie

May 12, 2020

Faults

Reservoir presence linked to faults

Steven Ogilvie

May 12, 2020

Faults

The Brae Field (N Sea) was a unique play type (at the time) - coarse sediments banked up against normal faults. Here we look at some analogues and examples.

Steven Ogilvie

March 7, 2020

Deformation Bands, Faults

Impact of Deformation Bands

Steven Ogilvie

March 7, 2020

Deformation Bands, Faults

Deformation bands are fault-like structures that reduce the reservoir quality of otherwise good quality sandstones. Here we look at their impact upon effective permeability, which has implications during reservoir development.