In early 1991, Blinman 2 wildcat drilled through 2031 metres of sediments of the late Adelaidean Umberatana Group on the flank of the Blinman Diapir. Three small methane shows occurred in fracture zones in the Tapley Hill Formation.Two potential hydrocarbon source intervals within the drilled sequence have been delineated by the present author. An interval corresponding to the Tindelpina Shale Member, intersected between 1550-1620 metres depth, has maximum TOC values of approximately 1.2%. A similar organic-rich interval from 865-1025 metres depth overlies an anhydrite-cemented breccia interpreted to represent reworked extrusive diapiric breccia. This episode of salt movement resulted in the rapid deepening of secondary peripheral sinks and the formation of anoxic conditions suitable for the preservation of organic matter. The effect of syn-depositional diapirism is also evident throughout the cored section as numerous slumps and turbidites of diapirically-sourced sediments.Analysis of kerogen isolated from the sediments indicates an equivalent vitrinite reflectance of approximately 2%, placing the thermal maturity of these source rocks just beyond the oil generation window. The lack of organic maturation is thought to be due to diapir re-activation and resulting buoyancy during the Delamerian Orogeny, which prevented deep burial of the sediments.The inferred continued movement of the diapir has also resulted in a very complex history of brecciation and cementation. Cement phases include a relic microstromatolitic dolomite rim with bitumen, and saddle dolomite. In general, where fracture porosity is present, entrapped natural gas also occurs.Synthetic seismograms indicate a strong reflector at the base of the Tapley Hill Formation, while other deeper reflectors with weak amplitudes represent various other stratigraphic boundaries.This study shows diapirism is directly related to all facets of hydrocarbon accumulation in the Blinman area, implying further exploration should be concentrated on the diapirs of the Central Flinders Ranges, with Martins Well providing a promising target.