Results 121 to 130 of about 1,267 (203)
Some of the next articles are maybe not open access.
Paleokarsts at Unconformities: ABSTRACT
AAPG Bulletin, 1982The awareness of the importance of subaerial exposure in the diagenesis of limestones has led to the recognition of a variety of subaerial phenomena in carbonate sequences such as vadose cements and calcrete crusts. Other such phenomena include paleokarsts, of which there are surprisingly few detailed descriptions. One problem in recognizing paleokarst
openaire +1 more source
Impact of Paleokarst on the Pinnacle Reef Reservoirs in the Sirt Basin, Libya
Petroleum GeoscienceMore than twenty pinnacle reefs have been discovered in the southeast of Ajdabiya Trough within the Paleocene carbonate sediments, most of which are oil-bearing.
Abdeladim M. Asheibi, Asghar Shams
semanticscholar +1 more source
1982
Karst-type ore deposits are a major new discovery in many countries made by many mining geologists during the past decade. The present paper offers a case study of an area in southern Sardinia where karstification took place at various intervals, producing superimposed karst systems and local sulphide-barite concentrations.
BONI, MARIA, AMSTUTZ G. C.
openaire +2 more sources
Karst-type ore deposits are a major new discovery in many countries made by many mining geologists during the past decade. The present paper offers a case study of an area in southern Sardinia where karstification took place at various intervals, producing superimposed karst systems and local sulphide-barite concentrations.
BONI, MARIA, AMSTUTZ G. C.
openaire +2 more sources
Ellenburger paleokarst in Midland basin: New insights
International Meeting for Applied Geoscience & EnergyThe study of Ellenburger paleokarst system has a long history. For more insights of this system, we focused on seismic facies and regional patterns of karst processes and distribution in 17 seismic surveys in Midland Basin and Central Basin Platform ...
Hongliu Zeng, R. Loucks, X. Janson
semanticscholar +1 more source
Fluid prediction for paleokarst carbonate reservoir
SEG Technical Program Expanded Abstracts 2015, 2015Summary Ordovician paleokarst carbonate reservoirs are widely developed in the Tahe Oilfield, China. The storage space is complex, mainly including dissolved caves, pores and fractures, which significantly influence the seismic velocity. In order to accurately discriminate the saturated pore fluids, DEM-Gassmann rock physic model is employed to address
Sam Zandong Sun +5 more
openaire +1 more source
International Meeting for Applied Geoscience & Energy
Paleokarst channels constitute a significant reservoir type within the Ordovician carbonate fracture-cavity reservoirs of the Tahe Oilfield. However, due to their deep burial depth and complex spatial distribution and considerable challenges for seismic ...
Hui Lv +3 more
semanticscholar +1 more source
Paleokarst channels constitute a significant reservoir type within the Ordovician carbonate fracture-cavity reservoirs of the Tahe Oilfield. However, due to their deep burial depth and complex spatial distribution and considerable challenges for seismic ...
Hui Lv +3 more
semanticscholar +1 more source
1991
Abstract The process of diagenesis can be defined for HD-reservoirs as porosity constructive or porosity destructive. Most reservoirs have been “metamorphosed” to some extent, especially carbonates, and this process develops reservoir heterogeneity.
openaire +1 more source
Abstract The process of diagenesis can be defined for HD-reservoirs as porosity constructive or porosity destructive. Most reservoirs have been “metamorphosed” to some extent, especially carbonates, and this process develops reservoir heterogeneity.
openaire +1 more source
A correction method of paleokarst channel width: A case study in the Tarim Basin, China
International Meeting for Applied Geoscience & EnergyPaleokarst channels of the Ordovician carbonate reservoirs are widely spread in the Tahe oilfield. However, paleokarst channel width identified by seismic attributes is very different from that of actual drilling, and there is a lack of effective ...
Hui Lv +4 more
semanticscholar +1 more source
Paleokarst as a target for modern karstification
Carbonates and Evaporites, 1995Paleokarst phenomena are those that at present or for some duration in the past have been decoupled from all active hydrogeochemical systems. They are widely distributed geographically and are recognized from the Lower Proterozoic onwards in the geological record. Amongst the many fascinating features that they offer for study is their exploitation as “
openaire +1 more source
Ordovician Knox Paleokarst Unconformity, Appalachians
1988The Ordovician Knox unconformity in the Appalachians developed in less than 10 m.y. during a time of initial collision of the passive margin and of eu- static sealevel lowering. It formed on cyclic limestones and dolomites of the 200- to 1200-m-thick Upper Knox-Beekmantown Group, and provides an example of the effects of long-term exposure on a ...
William J. Mussman +2 more
openaire +1 more source