A geologic study of the Livingston field

The Livingston field is located in the southern part of Polk County, Texas. Over the greater part of the field, the outcropping formation is the Willis, while in the extreme southern portion some Lissie is found in outcrop. The author has made use of electrical well log surveys, fault plane contours, cross-sections, and horizon contour maps in working out the structure of the field. Formations encountered in the wells are all Tertiary, from the outcropping Willis to some forty three hundred feet of Wilcox in the deepest well. The circular outline and amount of structural relief suggests that the field is a deep-seated dome, which is dissected by a complex network of faults. Outstanding among the structural features is a system of major faults dividing the structure into three upthrown blocks and an arched down-thrown block segmented by minor faults. The formations steepen and thicken on the downthrown sides in the vicinity of the faults, and the throws of most faults diminish upwards. These factors are Indicative of continuous activity of the faults since their origin, and the existence of an active upward thrust during their geologic existence. Four separate oil horizons are present in the field. The two most prolific are in the topmost sands of the Yegua and Wilcox. The third is a thin ten foot sand of Sparta age, absent in the western part of the field, and the fourth is a correspondingly thin sand of Hockleyensis age, of limited extent.