Organic and inorganic geochemistry, oil-source rock correlation, and diagenetic history of the Permian Spraberry Formation, Jo Mill Field, northern Midland Basin, West Texas

Shales from the Permian Spraberry Formation in the northern Midland basin contain sufficient organic matter to be considered excellent potential source rocks. Kerogen from Spraberry shales is a Type II amorphogen. Spraberry shales are submature having reached a maximum temperature of approximately 90;Early diagenetic events in individual lithofacies were influenced by depositional environments and initial sample mineralogy. The porosity and permeability of Spraberry sandstones are controlled by grain-size, total clay, sorting, packing, and the cementation history.;The relatively high porosities and low permeabilities in the Spraberry are attributed to the presence of isolated pores created by the dissolution of framework grains and cements, and abundant microporosity associated with authigenic and detrital matrix material. Much of the secondary porosity may have been created by organic acids.