Origin of Porosity in Deep Woodbine-Tuscaloosa Trend, Louisiana: ABSTRACT

Pre-requisites, processes, and prediction of chlorite grain coatings in petroleum reservoirs: A review of subsurface examples

“…Authigenic chlorite may also develop during diagenesis as a result of the dissolution of iron-and magnesium-rich detrital grains and volcanic rock fragments (AlDahan and Morad, 1986;Anjos et al, 2000;Blackbourn and Thomson, 2000;Burns and Ethridge, 1979;De Ros et al, 1994;Remy, 1994;Thomson, 1979;Valloni et al, 1991;Worden and Morad, 2003), and from mud intraclasts (Worden and Morad, 2003), and this can lead to a wide range of chlorite compositions. The development of chlorite-coats in reservoir sands from this range of detrital grains requires at least the partial dissolution of the original grain and the neoformation of a clay mineral.…”

“…Although attempts to generate a 'pure' chlorite proved difficult, the authors were able to generate a magnesium-rich 7Å phase with boxwork morphology. Thomson (1979) suggested that volcanic rock fragments (VRFs) could be the source of ions for the chlorite-coats in the Tuscaloosa Formation, Gulf Coast, USA. The study suggested a positive relationship between chlorite-coatings and VRFs.…”

Pressure retardation of organic maturation in clastic reservoirs: a case study from the Banqiao Sag, Eastern China

“…In fact, the concept of depth and/or thermal maturity controlled 'deadlines' for economic reservoir quality has permeated published work for decades (Branner, 1937;Hayes, 1991;Landes, 1967). Deep drilling in certain geological provinces, however, has demonstrated the preservation of reservoir quality that is exceptional considering the depth and thermal conditions to which the reservoirs have been exposed (Dixon, Summers, & Surdam, 1989;Thomson, 1979). Our work in the Banqiao Sag suggest that overpressure retardation of diagenesis may be a important factor controlling reservoir quality.…”

Connecting Microscopic Geological Features to Pore Geometry and Pore Structure: Case Study - Sandstone Reservoir of Balikpapan Formation, Kutai Basin

“…Pore-lining, pore bridging, pore-filling cement reduces pore space and throats in some extent. The occurrence of clay cement also inhibits the precipitation of other cement especially quartz overgrowths (Thomson, 1979 andBjorlykke, 1987), or clay cement such as kaolinite may also intergrown with quartz overgrowths. The existence of clay cement needs to be considered, although other diagenetic events such as grain dissolution and compaction may counteract the effect of cementation on pore geometry or pore structure.…”