Depositional Processes and Reservoir Characteristics of Siltstones, Mudstones and Shales
Siltstones, mudstones and shales have been studied mainly with regard to general transportdeposition processes and clay mineralogy. A small group of investigators, with differing backgrounds, have worked on these fine-grained deposits. Recent studies on deepwater deposits from cores and outcrops indicate that the presence of finer-grained deposits greatly affect the fluid flow properties of deepwater reservoirs. Characteristics and rock properties of these deposits, which resulted from a variety of depositional processes, are just beginning to be understood.
Microfabric and Organic Matter Impact on Burial Diagenesis from Mud to Shale
Published:January 01, 2004
Richard H. Bennett, Michael W. Lambert, Matthew H. Hulbert, Conrad W. Curry, Harold W. Olsen, Allen Lowrie, 2004. "Microfabric and Organic Matter Impact on Burial Diagenesis from Mud to Shale", Depositional Processes and Reservoir Characteristics of Siltstones, Mudstones and Shales, Erik D. Scott, Arnold H. Bouma
Download citation file:
Observations by transmission and scanning electron microscopy (TEM and SEM) of surficial sediment microfabric along with quantitative geochemical tests of organic matter from continental margin deposits reveal important fundamental interrelationships of material properties and processes during diagenesis of mud to shale. Fine-grained surficial muds possessing ≥2% total organic carbon (TOC) and ≥5% smectite commonly have very high porosities (≥90%), low wet bulk densities, and very low effective stresses that are consistent with minimal dewatering and consolidation in the upper few meters subbottom. These muds are characterized by random orientation of clay domains and marine organic material in the form...