EVIDENCE OF HYDROTERMAL VEINS IN BASAMENT ROCKS, INTEGRATING POTENTIAL DATA WITH ROCK-PHYSICS AND P-IMPEDANCE SEISMIC INVERSION AND ITS RELATIONSHIP WITH SALT WATER DISPOSAL WELLS AT NORTHERN OKLAHOMA

Northern Oklahoma, in particular Osage county has been intensively drilled since the first well was completed in 1896. By 1982 Osage county was the second nationwide for wells drilled with more than 35 thousand drilled wells and produced more than 450 million barrels of Oklahoma crude oil. Given the well density of the area, an unintended benefit is having deep insight on the physical properties of the subsurface, i.e. resistivity, sonic information, rock description, water saturation, etc. Using gravimetry and magnetic data recorded in the area and correlate the basement geometry with seismic information in southeastern Osage county, we established the fault architecture.From borehole wireline logs we investigate dynamic elastic properties from borehole information extrapolated them seismic data using rock-physics models and P-Impedance inversion. Also, calibrate the results using geomechanical model of several wells to imagine hydrothermal veins response on brittleness index. We compute rock mechanic properties on borehole position and extrapolated this response using seismic inversion correlated with borehole well log data. Also, we use other borehole velocity profiles in northeastern Oklahomato show the possibility of having low velocity layer below seismic resolution causing a weakness zone inside the Precambric basement. Also, we show that the sealing capacity of a fault is reduced with pore pressure instabilities product of fluid unbalances; hence fault creep can be initiated by pockets of high pressure of fluids contained within the basement and its connection with Paleozoic stratigraphical units. In general, using rock physics and well-log information from boreholes in the area, we show that borehole drilled near deep faults have severe loss of circulation, especially in faults that show an evidence of connecting Paleozoic groups to the basement and the brittleness index suggest as a possible cause is faults can lead to connect present hydrothermal waters and drilled well created a pressure disruption in fractured igneous rocks that constitute the Precambrian basement northeastern Oklahoma.