Imperial College London
Alternate

Dr Craig Smalley

Faculty of Engineering, Department of Earth Science & Engineering

Visiting Professor
 
 
 
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Contact

 

c.smalley

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

108 results found

Muggeridge A, Abacioglu Y, England W, Smalley Cet al., 2005, The rate of pressure dissipation from abnormally pressured compartments, AAPG BULLETIN, Vol: 89, Pages: 61-80, ISSN: 0149-1423

Journal article

Muggeridge A, Abacioglu Y, England W, Smalley Cet al., 2004, Dissipation of anomalous pressures in the subsurface, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 109, ISSN: 2169-9313

Journal article

Smalley C, England W A, Muggeridge A, Abacioglu Y, Cawley Set al., 2004, Rates of Reservoir Fluid Mixing: Implications for Interpretation of Fluid Data, Understanding Petroleum Reservoirs: Towards an Integrated Reservoir Engineering, Editors: Cubitt M, England A, Larter R, England, Publisher: Geological Society, ISBN: 9781862391680

Book chapter

Worden RH, Smalley PC, Barclay SA, 2003, H<sub>2</sub>S and diagenetic pyrite in North Sea sandstones:: due to TSR or organic sulphur compound cracking?, GEOFLUIDS IV Meeting, Publisher: ELSEVIER SCIENCE BV, Pages: 487-491, ISSN: 0375-6742

Conference paper

Marchand AME, Smalley PC, Haszeldine RS, Fallick AEet al., 2002, Note on the importance of hydrocarbon fill for reservoir quality prediction in sandstones, AAPG BULLETIN, Vol: 86, Pages: 1561-1571, ISSN: 0149-1423

Journal article

Marchand AME, Haszeldine RS, Smalley PC, Macaulay CI, Fallick AEet al., 2001, Evidence for reduced quartz-cementation rates in oil-filled sandstones, GEOLOGY, Vol: 29, Pages: 915-918, ISSN: 0091-7613

Journal article

Worden RH, Smalley PC, 2001, H<sub>2</sub>S in North Sea oil fields:: importance of thermochemical sulphate reduction in clastic reservoirs, 10th International Symposium on Water-Rock Interaction, Publisher: A A BALKEMA PUBLISHERS, Pages: 659-662

Conference paper

Worden RH, Smalley PC, Cross MM, 2000, The influence of rock fabric and mineralogy on thermochemical sulfate reduction: Khuff Formation, Abu Dhabi, JOURNAL OF SEDIMENTARY RESEARCH, Vol: 70, Pages: 1210-1221, ISSN: 1073-130X

Journal article

Worden RH, Smalley PC, Oxtoby NH, 1998, Gas souring by thermochemical sulfate reduction at 140°C:: Reply, AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS, Vol: 82, Pages: 1874-1875, ISSN: 0149-1423

Journal article

Worden RH, Oxtoby NH, Smalley PC, 1998, Can oil emplacement prevent quartz cementation in sandstones?, PETROLEUM GEOSCIENCE, Vol: 4, Pages: 129-137, ISSN: 1354-0793

Journal article

Worden RH, Smalley PC, Oxtoby NH, 1998, Reply to the comment by H.G. Machel on "The effects of thermochemical sulfate reduction upon formation water salinity and oxygen isotopes in carbonate reservoirs", GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 62, Pages: 343-346, ISSN: 0016-7037

Journal article

Smalley PC, Goodwin NS, Dillon JF, Bidinger CR, Drozd RJet al., 1997, New tools target oil-quality sweetspots in viscous-oil accumulations (vol 12, pg 157, 1997), SPE RESERVOIR ENGINEERING, Vol: 12, Pages: 226-226, ISSN: 0885-9248

Journal article

Smalley PC, Goodwin NS, Dillon JF, Bidinger CR, Drozd RJet al., 1997, New tools target oil-quality sweetspots in viscous-oil accumulations, SPE RESERVOIR ENGINEERING, Vol: 12, Pages: 157-161, ISSN: 0885-9248

Journal article

Worden RH, Smalley PC, Fallick AE, 1997, Sulfur cycle in buried evaporites, Geology, Vol: 25, Pages: 643-646, ISSN: 0091-7613

Sulfur isotopes are potent indicators of the way in which sulfur behaves chemically during diagenesis. We have studied sulfur isotope ratios ( 34 S/ 32 S) from a number of minerals and compounds across the Permian-Triassic boundary in the Khuff Formation. Abu Dhabi. The δ 34 S in dissolved marine sulfate increased by 10‰ from the Late Permian to the Early Triassic. Despite precipitation of gypsum from Permian and Triassic seawater and its subsequent dehydration to anhydrite at depths greater than about 1000 m, the primary marine stratigraphic sulfur isotope variation has been preserved in anhydrite in the Khuff Formation. A combination of biostratigraphic and absolute age data show that this 10‰ shift occurred over < 2 m.y. Gypsum dehydration to anhydrite has not involved significant isotopic fractionation or diagenetic redistribution of material in the subsurface. The sulfur isotope variation across the Permian-Triassic boundary is also present in elemental sulfur and H 2 S, at depths greater than 4300 m, formed by reaction of anhydrite with hydrocarbons via thermochemical sulfate reduction. This demonstrates that sulfate reduction has not led to isotope fractionation. It also demonstrates that significant mass transfer has not occurred, at least in the vicinity of the Permian-Triassic boundary, even though elemental sulfur and H 2 S art both fluid phases at depths greater than 4300 m. Thus, despite two major diagenetic processes that converted the sulfur in gypsum into elemental sulfur and H 2 S by 4300 m burial and the potentially mobile nature of some of the reaction products, the primary differences in sulfur isotopes have been preserved in the rocks and fluids. All reactions occurred in situ; there was no significant sulfur isotope fractionation, and only negligible sulfur was added, subtracted, or moved internally within the system.

Journal article

Worden RH, Smalley PC, Fallick AE, 1997, Sulfur cycle in buried evaporites, GEOLOGY, Vol: 25, Pages: 643-646, ISSN: 0091-7613

Journal article

Worden RH, Smalley PC, Oxtoby NH, 1997, Gas souring by thermochemical sulfate reduction at 140 degrees C: Reply, AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS, Vol: 81, Pages: 816-817, ISSN: 0149-1423

Journal article

Fouke BW, Everts AJW, Zwart EW, Schlager W, Smalley PC, Weissert Het al., 1996, Subaerial exposure unconformities on the Vercors carbonate platform (SE France) and their sequence stratigraphic significance, Geological Society Special Publication, Vol: 104, Pages: 295-320, ISSN: 0305-8719

The integration of data on diagenesis and stratal geometry at the margin of the Vercors carbonate platform (SE France) shows that the most prominent break in depositional style does not coincide with the platform-top horizon exhibiting the most extensive meteoric alteration. This observation again illustrates the ambiguity of geometrical criteria to define sequence boundaries related to subaerial exposure. Outcrops at the margin of the Cretaceous Vercors platform expose prograding to aggrading tongues of platform grainstones. Growth and lateral progradation of these platform tongues was frequently interrupted, as evidenced by the deposition of wedges of fine-gmtaed deeper water sediments that encroached the clinoform slopes. Petrographic and geochemical analyses have been carried out at strategic bedding surfaces in order to evaluate the extent to which these breaks relate to sea-level falls and subaerial exposure. The analyses reveal evidence for minor meteoric alteration at all four of the bedding surfaces on the platform top that were studied. However, the Surface 3 bedding plane is unique in that it shows the overprinting of several events of meteoric diagenesis. Petrographic and geochemical analyses suggest that the rudist floatstones at this particular surface were diagenetically overprinted at least three times by meteoric groundwaters that dissolved skeletal grains and precipitated bladed and blocky calcite cements that exhibit bladed to blocky morphologies, low Mg, Mn and Fe abundances, depleted δ18O and δ13C signatures, and freshwater fluid inclusions. Hardground borings then cross-cut the meteoric calcite cements and biomolds, indicating that the subaerial exposure and meteoric overprinting took place prior to deposition of the overlying marine grainstones. This ensuing period of marine inundation was also accompanied by the deposition of red argillaceous internal sediments and dolomitization. The marine grainstones overlying Surface 3 contain

Journal article

Worden RH, Smalley PC, 1996, H2S-producing reactions in deep carbonate gas reservoirs: Khuff Formation, Abu Dhabi, CHEMICAL GEOLOGY, Vol: 133, Pages: 157-171, ISSN: 0009-2541

Journal article

Worden RH, Smalley PC, Oxtoby NH, 1996, The effects of thermochemical sulfate reduction upon formation water salinity and oxygen isotopes in carbonate gas reservoirs, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 60, Pages: 3925-3931, ISSN: 0016-7037

Journal article

Smalley PC, Hale NA, 1996, Early identification of reservoir compartmentalization by combining a range of conventional and novel data types, SPE FORMATION EVALUATION, Vol: 11, Pages: 163-169, ISSN: 0885-923X

Journal article

Smalley PC, Goodwin NS, Dillon JF, Bidinger CR, Drozd RJet al., 1996, New tools target oil quality sweetspots in viscous oil accumulations, Pages: 911-917

API gravity and dead oil viscosity can be predicted using geochemical parameters measured from core or sidewall core samples. Spatial variations in oil properties can be difficult to map empirically simply by contouring data, since more than one controlling factor may be operative. A major step in improving fluid mapping is to identify and quantify these controls and map them. These maps are then used to attempt oil sweetspot prediction in areas away from well control.

Conference paper

Smalley PC, Dodd TA, Stockden IL, Råheim A, Mearns EWet al., 1995, Compositional heterogeneities in oilfield formation waters: Identifying them, using them, Geological Society Special Publication, Vol: 86, Pages: 59-69, ISSN: 0305-8719

Two new techniques are now available for gaining information on formation water composition from core samples: core centrifugation, in which preserved core samples, complete with their preserved fluid content, are ultracentrifuged to extract the oil and water; and residual salt analysis (RSA), where salts are redissolved from unpreserved dry core and parameters such as 87Sr/86Sr are measured in the leachate. These methods are described and details given on the quality control measures that are crucial in order to avoid artefacts of core contamination by drilling fluids. Such methods have allowed formation-water compositional data to be obtained at the sub-metre scale, in some cases revealing significant small-scale variations (gradients and steps) in formation-water chemistry. Resistivity (related to salinity) variations are important for interpretation of water saturation from electrical resistivity logs, which in turn affects the estimate of the total amount of oil contained in the field. In the Machar chalk-reservoired oilfield, formation-water data derived by RSA and core centrifugation both indicate variations in salinity (TDS 140 000-220 000 ppm) that significantly affect resistivity. In some oilfields, assumption of a single resistivity value for the whole field could thus lead to errors in petroleum reserves estimation. Step changes in formation-water composition can be used as indicators of reservoir fluid compartmentalization, important for field development strategy. Examples are given of cases where RSA variations have been used to distinguish between laterally restricted and laterally extensive shales, both in the oil and water legs. Analysis of water compositional variation forms a valuable addition to the range of tools available for assessing reservoir compartmentalization during reservoir appraisal. This is because natural variations in fluid compositions provide quasi-dynamic data (i.e. how fluids have moved slowly during geological time), from whi

Journal article

Smalley PC, Hale NA, 1995, Toolkit for early identification of reservoir compartmentalization, Pages: 25-34

Reservoir compartmentalization (vertical and lateral) is often a major uncertainty at the field appraisal stage, impacting important investment decisions. Unfortunately the most definitive compartmentalization data (dynamic production data) are not usually available so early in field life. This paper illustrates how early indications of compartmentalization can be achieved by integration of various types of static data, using an example from the Ross oilfield, UKCS. Here, integration of oil molecular maturity parameters, GC fingerprinting, PVT data, well test analysis and fault seal analysis with interpretation of 3-D seismic revealed the presence of several sealing faults, and thus enabled the field to be described in terms of its natural segmentation. Vertical compartmentalization was investigated using a combination of oil geochemistry (maturity, GC fingerprinting), residual salt analysis and high-resolution stratigraphy, revealing a continuous shale that has a lateral extent of >5 km; it divides the reservoir into two main layers. The results of this study helped to decrease uncertainty in field development planning. The key message is that there are many tools available in the toolkit to aid in assessing compartmentalization, but individually they each only give part of the picture. It is therefore important to use several tools in combination.

Conference paper

WORDEN RH, SMALLEY PC, OXTOBY NH, 1995, GAS SOURING BY THERMOCHEMICAL SULFATE REDUCTION AT 140-DEGREES-C, AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS, Vol: 79, Pages: 854-863, ISSN: 0149-1423

Journal article

MALIVA RG, DICKSON JAD, SMALLEY PC, OXTOBY NHet al., 1995, DIAGENESIS OF THE MACHAR FIELD (BRITISH NORTH-SEA) CHALK - EVIDENCE FOR DECOUPLING OF DIAGENESIS IN FRACTURES AND THE HOST ROCK, JOURNAL OF SEDIMENTARY RESEARCH SECTION A-SEDIMENTARY PETROLOGY AND PROCESSES, Vol: 65, Pages: 105-111, ISSN: 1073-130X

Journal article

WORDEN RH, WARREN EA, SMALLEY PC, PRIMMER TJ, OXTOBY NHet al., 1995, EVIDENCE FOR RESETTING OF FLUID INCLUSION TEMPERATURES FROM QUARTZ CEMENTS IN OILFIELDS - DISCUSSION, MARINE AND PETROLEUM GEOLOGY, Vol: 12, Pages: 566-570, ISSN: 0264-8172

Journal article

Richard H Worden, P Craig Smalley, 1995, Reactions Controlling H2S Concentration in Deep Carbonate Reservoirs: ABSTRACT, AAPG Bulletin, Vol: 79, ISSN: 0149-1423

Journal article

Warren EA, Smalley PC, 1994, The Amethyst Field, Geological Society Memoir, Vol: 15, Pages: 3-77, ISSN: 0435-4052

Journal article

Warren EA, Smalley PC, 1994, Part 2: SPWLA Water Resistivity (R<inf>w</inf>) Atlas, Geological Society Memoir, Vol: 15, Pages: 79-103, ISSN: 0435-4052

Journal article

Warren EA, Smalley PC, 1994, North Sea formation waters atlas, ISBN: 1897799071

This atlas provides data on formation water compositions from throughout the North Sea Basin. The objective was not simply to provide a table of water compositions, but to supply as much supplementary data on reservoir conditions and geological setting as possible to enable the individual data to be placed in context. The atlas contains four main sections: a field compendium, comprising a field-by-field compilation of water compositions with accompanying geological description and field maps; a water resistivity (R w ) atlas; scale prediction maps estimating susceptibility of produced waters to scaling; and a water chemistry atlas. -from Editors

Book

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