SM Energy公司于2025年与Civitas Resources公司合并，该公司在德克萨斯州西南部靠近美墨边境的地方设立了该研究地点。这项耗资2000万美元的项目包括两个配备精密仪器的三井井场，它们是奥斯汀白垩纪/鹰福特油田实验室的一部分，该实验室的部分资金由美国能源部提供，并由德克萨斯农工大学的研究人员牵头。
New Answers to Tight Rock’s Biggest Mystery What Do Hydraulic Fractures Really Look Like?
Findings from two new SPE papers argue that the tight-rock sector needs to rethink longstanding assumptions about how hydraulic fractures form underground.
Source: Dimitrios Stefanidis/Getty Images.
Almost a quarter century into the modern era of horizontal wells and multistage hydraulic fracturing, many questions remain about what actually happens in the deep subsurface when water and sand meet tight rock. Two of the biggest questions can be boiled down to this: What do hydraulic fractures really look like, and how are they really created?
One of them, SPE 230601, comes from a team of 10 researchers from academia, the private sector, and US government laboratories and presents what is believed to be the first documented field evidence of large-scale bedding-plane slippage induced by hydraulic fracturing operations in the US.
Illustrations show conceptual models of two different types of bedding-plane slippage events: (a) shows a small-scale event, while (b) shows a large-scale event where tectonic stress and induced vertical fractures play a role. The latter is seen often in China’s Sichuan Basin, where tectonic forces are pronounced, and when not planned for, the slippage can result in unwanted impacts such as casing deformation.
Source: SPE 230601.
SM Energy, which merged with Civitas Resources in 2025, hosted the study site in southwest Texas near the US-Mexico border. The $20-million project involved a highly instrumented pair of three-well pads that were part of the Austin Chalk/Eagle Ford Field Laboratory, which was partially funded by the US Department of Energy and led by researchers from Texas A&M University.
The latest study on the data obtained from the test site is focused on a treatment-monitor well pair within one of the three-well pads that were stimulated between late 2021 and early 2022.
The paper about what happened there stands out because it argues that a substantial fracture area was created through bedding-plane slippage of a soft layer of clay that is known to be present within the formation.
This is well outside what most completions engineers plan for, because it is not only difficult to predict but can also lead to casing deformation or induced seismicity. But in this case, the outcome was oil and gas production from both wells that beat the operator’s typical type curves.
The paper did not share production figures, leaving conference attendees without a clear sense of how strongly the wells ultimately performed. What the industry is told in the paper is that the above-average result “suggests that bedding planes and preexisting vertical fractures effectively connected wells to complex natural fracture networks, significantly increasing effective fracture surface area.”
The authors continued, writing, “The shear motion of bedding plane shear and vertical natural fracture reactivation may preserve conductivity in the long term, which would significantly increase reservoir productivity.”
Ge Jin, a geophysicist and associate professor at the Colorado School of Mines, is the lead author and presented the paper at HFTC in February.
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