![]() Point bars and mid-channel bars cannot be distinguished. The overlying point bar deposits may be sand dominated, also giving a blocky signature.” Consultant sedimentologist Jon Noad says on Twitter: “Some meandering river deposits have a thick package of trough cross-bedded sands at the base, giving a thick, blocky signature in an overall meandering setting. However, I would look to justify my interpretation with other evidence of braided fluvial deposits and lack of evidence supporting a meandering river.” He writes: “If I a priori knew that the succession was 100 % fluvial and there was a blocky sand with no fining upward, I would call that a high-discharge braided fluvial deposit. In a comment on the poll on LinkedIn, Adam Goss from CNOOC responded in a way that is probably a good representation of how the “yes” voters approach the question. See also: Should Maximum Flooding Surfaces in carbonate sequences always be interpreted at a peak in thorium and potassium? Out of the 98 people who voted, 47 are of the opinion that it is possible to make a call on river patterns based on a gamma-ray response, while an ever so slight majority of 51 think the other way. ![]() Out of the three questions we polled, the one on the distinction between braided and meandering river deposits resulted in the most engagement and the highest degree of “division”. This is part 2 of the cover story that has now also appeared in Issue 2 of the magazine. Today, we discuss the poll related to fluvial depositional environments. Each poll asked a simple question related to an important depositional environment fluvial, carbonates and deep water. We decided to add some spice to these discussions and ran three polls on LinkedIn and Twitter. The more geologists in the room, the more ideas and interpretations. ![]() For most people working in subsurface teams, discussions related to the interpretation of depositional facies on the basis of well logs are part of the daily routine. ![]()
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