The reservoirs are tight sand, with an average porosity of 4. 74% and permeability of 0. 417×10-3 μm2. Delta front underwater distributary channel and mouth bar are the favorable reservoir micro-facies.
The sand body of the Yang-61-2 oil layer in Y oil field is accurately identified in its configuration, the river channel is considered the best exploration and exploitation area for oil-gas pools in the Ordos basin.
The braided river channel and underwater distributary channel microfacies are favorable sedimentary facies belts in the Block and the geometry and distribution of reservoir sandbodies are controlled by the direction and extended distance of channels.
Based on point bar sedimentarymechanism, and combine with point bar vertical sequences, type and compositionlateral bedings of point bar, we built the transversal sedimentary model of singlelateral beding and the sedimented rock model of lateral accretion of point bar, andform inner interlayer and combined relation of point bar, the description methodsof space distributing characterization and the internal architecture modelingtechnologies in meandering stream channel sand.
②the contain capacity of flexure slope break is large and abundance in sediment source. The fan-delta, coastal lake facies, eroded valley and lowstand fan formed by under-water fluvial channel are located at the third level sequence boundary.
The deposited sandstone style including fluvial channel sand, crevasse channel sand, interstream sand, interstream silt, under water distributary channel sand, delta front sheet sand and etc.
To meander channel, because the channel continuously moved, form duplicate fluvial sand bodies largely, and there are many area of non sandbodies or in fluvial sandbodies, there are some abandoned channel, all make the continuous of sandbodies poor upper the meander channel sandbodies, so remained oil is mainly distributed in sandbodies in fluvial channel, abandoned channel and non sandbodies area nearby.
Aliasing error bounds are derived for one- and two-channel sampling series analogous to the Whittaker-Kotel'nikov-Shannon series, and for the multi-band sampling series, and a "derivative" extension of it, due to Dodson, Beaty, et al.
Guanidine-type compounds that reached clinical status include amongst others the potassium channel opener, pinacidil and the histamine H2-receptor antagonists (e.g.
Their cross sectional distribution patterns in relation to the river channel morphologies were examined by using ship-mounted ADCP (Acoustic Doppler Current Profiler) instrument.
The influence of the water level in the period of the open river channel and the duration of lower floodplain inundation on the feeding conditions, abundance, and population state of coregonids in the Lower Ob was investigated.
It is shown that the radionuclide distribution across the floodplain and along the river flow is determined by the formation of a barrier to their migration near the river channel, at which less mobile 137Cs accumulates.
Electromagnetic terrain conductivity surveys were performed within the stream channel to identify zones of increased relative water saturation to depths less than 15 m.
Using this information on potential loss zones, an experimental grouting procedure was applied by injecting an expandable polyurethane grout to a depth less than one meter into the alluvial streambed over a 180-m section of the stream channel.
The Yaodian Formation consists of fluvial channel deposits (11.67-10.40 Ma) at the bottom, floodplain deposits in the middle (10.40-9.23 Ma) and shallow lake sediments at the top (9.23-7.43 Ma).
The planoconcave fluvial channel-fill sandbodies with unidirectional cross-beds are clearly distinguishable from the delta front bars that show a convexo-plan or bi-convex sandbody geometry and dominance of wave and combined flow bedforms.
It has been observed from the production practice in Daqing, Yumen and Dagang oil fields that in the process of waterflooding in sandstone oil pools, the injected water generally advances more rapidly in the same direction as the trend of deposition of the sandstone than against it, and wide discrepancies exist in the state of exploitation of wells in the different directions. This is because most of the pay zones in these oil fields are channel sandstone deposits. On the basis of the process and character ...
A typical terrigenous lacustrine deltaic distributary channel sandbody is investigated in the outcrop of Pliocene series at Youshashan, west Chaidamu basin, Qinghai province. The sandbody is composited of pebble sandstone and middle—fine sandstone with 2 or 3 segments of straight line on the grain size cumulative probability curves. Its sedimentary structure includes large-scale inclined beddings, trough cross-beddings, low-angle cross-beddings as well as an erosional basal surface. The sandbody has 2 asymm...
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