顶岩
1.Accumulating sand can lead to great pressure on top of the grottoes and ponding in the rock mass.
2.Study on Organic Geochemistry of the Siliceous Rocks of Taiyangding Group---The Source Bed of Laerma Gold Deposit
3.The author describes the characteristics of the Caledonian erosional surface in the North China, i. e the top sur-faceof the Ordovician marine carbonate system (Tg reflection wave group), and its controlling over the formation of the oil/gas pools in the marine carbonate sequences.
4.Therefore, in the process of load transfer within the unconsolidated confined aquifer, the key strata of overburden rock are prone to have a compound breakage when the load on the upper interface of bedrock is great and the bedrock is very thin.
5.The reef of Baodao 23 1 structure(Reef 1158) is located in an enclosed carbonate platform along the south margin of Shenhu Uplift,Pearl River Mouth Basin,and its top T32 horizon (the lower top of Member 2,Pearl River Formation) has a trap area of 80km 2.A comprehensive analysis of available data (seismic,logging,lithochemistry,paleontology and drill core) has indicated that some platform rim reefs may develop along the south margin of Shenhu Uplift.
6.However, the authors discovered recently that the top and bottom surfaces of the Loushanguan Formation are palaeokarst unconformity interfaces, and there are a lot of interbeds of granular (oolite, pisolite and oncolite) dolomite and algae-mat dolomite, especially sedimentary structures such as the bird?s eye, stromatolite, cross bedding and tepee structures.
7.Hefei-Ningguo profile which was interpreted geologically and geophysically is given in the paper,and the isobath map of g_2 interface,corresponding to the top surface of Chinglong limestone deposited in Indo-Chinese epoch,is also shown in the pa- per.
8.Compared to poststack time migration, prestack time migration results in clear images of fractures and cavities in the Ordovician carbonate rocks, and definite unconformities at top of the Ordovician.
9.Emperor Titus. New the top of the Temple Mount is occupied by the Dome of the Rock and a mosque.
10.Lower Paleozoic buried hill of Zhuangxi was comprised by Cambrian of Lower Paleozoic and carbonate rock of Ordovician. The buried depth of top surface is 3500 ~ 4600m, and total thickness is 1300 ~ 1500m. The basement is granite gneiss of Archaean.
