A level where sedimentary rocks cover an older rock surface partly removed by erosion. The level marks a time gap. Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited Want to thank TFD for its existence?Tell a friend about us, add a link ...
An unconformity is a contact between two rock layers between which time is missing or the geologic record is broken. This means there was an erosional event in the past that removed rock before the layers were deposited on top and a piece of the fossil record is missing. How is angular un...
erosion, and renewedsediment deposition. Geologists find angular unconformities particularly valuable, as they document past changes in rock layer orientation caused by tectonic forces. These formations, seen in rock layers around the world, offer insights into the complex ...
the ends of the old strata abut the base of the younger overlying stratum. Angular unconformities are formed when previously deposited strata have been tilted or folded and then the upper parts of the strata destroyed (by marine erosion, for example) and layers of a new stratum deposited on...
Differences of Hydrocarbon Enrichment between the Upper and the Lower Structural Layers in the Tazhong Paleouplift The Tazhong paleouplift is divided into the upper and the lower structural layers,bounded by the unconformity surface at the top of the Ordovician carbonate rock.The reservoirs in the ...
4.Unconformityplays an important role in hydrocarbon accumulation. 不整合对油气藏形成有重要作用。 youdao 5. Surface ofunconformitycontrols the gas migration and accumulation. 不整合控制着天然气的运移和聚集。 youdao 6. At Scinto 6 uranium occurs in much altered dolerite below theunconformity. ...
At the same time, the structural body may be divided into three layers, including upper layer, mid layer, and lower layer. The upper layer with good primary porosity serves as the hydrocarbon migration system, and also accumulates the hydrocarbon. The mid layer with compactness and ductility ...
pathwaysintheSikeshuSagoftheJunggarBasin,whichconsistsofthreelayers:uppercoarseclastic rock.1owerweatheringcrustandIeachedzone.Theuppercoarseclasticrockischaracterizedbyhigher densityandlowerSDTandgamma-rayloggingparameters,whilethelowerweatheringcrustdisplays
According to the types and affect of transporting layers, the pathway systems for hydrocarbon migration in western Gaoyou Sag were classified into three ca... Q Chen,WH Zhang,F Huang,... - 《Journal of Oil & Gas Technology》 被引量: 7发表: 2009年 Principal controlling factors of the forma...
The unconformity surface at the bottom of the Paleogene, located in the Sikeshu Sag of the Junggar Basin, Northwest China, is one of the most important hydrocarbon migration pathways and characterized by 3 layers of upper coarse clastic rock, lower weathering crust and leached zone. The upper ...