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We develop and test a methodology to infer paleostress from the morphology ofstylolites within borehole cores. This non-destructive method is based on theanalysis of the stylolite trace along the outer cylindrical surface of thecores. It relies on an automatic digitization of high-resolution photographsand on the spatial Fourier spectrum analysis of the stylolite traces. We testand show, on both synthetic and natural examples, that the information fromthis outer cylindrical surface is equivalent to the one obtained from thedestructive planar sections traditionally used. The assessment of paleostressfrom the stylolite morphology analysis is made using a recent theoreticalmodel, which links the morphological properties to the physical processesacting during stylolite evolution. This model shows that two scaling regimesare to be expected for the stylolite height power spectrum, separated by across-over length that depends on the magnitude of the paleostress duringformation. We develop a non linear fit method to automatically extract thecross-over lengths from the digitized stylolite profiles. Results on cores fromboreholes drilled in the surroundings of the Andra Underground ResearchLaboratory located at Bure, France, show that different groups of sedimentarystylolites can be distinguished, and correspond to different estimated verticalpaleostress values. For the Oxfordian formation, one group of stylolitesindicate a paleostress of around 10 MPa, while another group yields 15 MPa. Forthe Dogger formation, two stylolites indicate a paleostress of around 10 MPa,while others appear to have stopped growing at paleostresses between 30 and 22MPa, starting at an erosion phase that initiated in the late Cretaceous andcontinues today. This method has a high potential for further applications onreservoirs or other geological contexts where stylolites are present.

Morphological analysis of stylolites for paleostress estimation in limestones surrounding the Andra Underground Research Laboratory site