HOMING IN ON 'SWEET SPOTS' IN CRETACEOUS AUSTIN CHALK

Gilbert E. Thomas Thomas & Associates Denver Frank P. Sonnenberg Consulting Geologist Denver In discussing the nature and causes of fracturing in the Cretaceous Austin chalk of south central Texas, many geologists and operators involved in horizontal drilling of the chalk consider regional rock stress as the probable main cause of the fractures. Galloway et al.,1 for example, states that the "fractures resulted from regional extensional stress acting on brittle chalk units sandwiched between

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