Petrolog is a geological well logging service company that operates primarily in the San Joaquin, Santa Maria, Los Angeles, and Ventura basins. We provide real time web-based data that includes rock description, oil show evaluation, gas chromatography, sample photos and more. We hire degreed geologists to operate our onsite mobile laboratories. Through our mud logging services, it is our professional goal to search for and discover more oil. Attention to detail is our motto and professional personalized service is our practice.