Faults and fault properties in hydrocarbon flow models

The petroleum industry uses subsurface flow models for two principal purposes: to model the flow of hydrocarbons into traps over geological time, and to simulate the production of hydrocarbon from reservoirs over periods of decades or less. Faults, which are three-dimensional volumes, are approximated in both modelling applications as planar membranes onto which predictions of the most important fault-related flow properties are mapped. Faults in porous clastic reservoirs are generally baffles or barriers to flow and the relevant flow properties are therefore very different to those which are important in conductive fracture flow systems. A critical review and discussion is offered on the work-flows used to predict and model capillary threshold pressure for exploration fault seal analysis and fault transmissibility multipliers for production simulation, and of the data from which the predictions derive. New flow simulation models confirm that failure of intra-reservoir sealing faults can occur during a reservoir depressurization via a water-drive mechanism, but contrary to anecdotal reports, published examples of production-induced seal failure are elusive. Ignoring the three-dimensional structure of fault zones can sometimes have a significant influence on production-related flow, and a series of models illustrating flow associated with relay zones are discussed.     

The One Nation Group: A Tory Approach to Backbench Politics and Organisation, 1950-55

The One Nation Group enjoys a mythic place in the history ofthe postwar Conservative Party. It has often been portrayedas being of extraordinary importance both for its early writings,One Nation (1950) and Change is Our Ally (1954), and for a behind-the-scenesparliamentary influence seen to exceed greatly that which wouldnormally be expected from a private dining group of ConservativeMPs. The group, with its firm association with ‘One Nation’Conservatism, has been seen to be at the fore of modernizingforces in the party in the early postwar years, and to haveplayed a pivotal role in the reshaping of Conservatism in thisperiod. This study examines the group via its publications,minutes of its weekly discussions, memoranda, and correspondence.These provide insight into the nature of backbench Conservatismand shed light upon the dynamics, activities, and beliefs ofa body that swiftly established itself as by far and away themost prestigious and respected of the unofficial Conservativeparliamentary groups. ¹I would like to acknowledge my debt to the following for givingfreely of their time in interview or correspondence for thisstudy: the late the Rt. Hon. the Lord Alport, TD, DL; the Rt.Hon. the Lord Carr of Hadley, FIC; the Rt. Hon. the Lord Gilmourof Craigmillar; the late Sir Gilbert Longden, MBE; and the lateJ. Enoch Powell, MBE; and two other sources who wished to remainanonymous. Stuart Ball, Nicholas Crowson, Dona Diani, and JohnRamsden have all read this article at various stages and offeredhelpful advice and criticism, and I would also like to thankJohn Barnes for advice when this project was in an earlier incarnation.     

A COMPARISON OF INDUCTIVELY-COUPLED PLASMA EMISSION SPECTROMETRY AND ATOMIC ABSORPTION SPECTROMETRY ANALYSIS ON STANDARD REFERENCE SILICATE MATERIALS AND CERAMICS

Analyses by inductively coupled plasma atomic emission spectrometry and atomic absorption spectrometry of 22 ceramic standards and sherds are compared. Further data from analyses of one of the ceramic standards analysed by both methods are also discussed. The results show that for most major elements, the methods are comparable, but that use of common standards would be advisable if data from the two methods are to be compared.