I'm excited to announce that I'm launching a new initiative here on Knowledgette: an evolving collection of images of natural fractures to accompany the series of videos in my course: Naturally Fractured Reservoirs – Recognition and Characterization for Geologists and Reservoir Engineer.

Every week I’ll add a new image to the collection along with some comments about its fracture -related character. This will give us all something to look forward to weekly! By the end of the year we will have a collection of photographs that illustrate attributes of a reservoir natural fracture system.

We’re calling it Fifty Photos for Fracture Aficionados.

So, our first image!

What do you see when you visit in Las Vegas? A short drive northeast to Arrow Canyon reveals Pennsylvanian-age Bird Spring Formation. This exposure of bedded carbonates is in the east-dipping panel of a large anticline similar to those currently being explored in the Kurdish region of Iraq. The joints in this photo are perpendicular to bedding. Did they originally form vertically, prior to folding of the beds, then rotate to their current attitude? Or did they form normal to bedding after the anticline developed? Or something in-between? Notice that the distance between joints varies with bed thickness.