4.1.2 Specification of key parametres of layers of operational objects

As productive collectors on deposit Uzen sandstones and the siltstones which are collectors porovogo of type serve. Characteristic line peschano-alevrolitovyh collectors of productive thickness is their heterogeneity expressed as in their significant variability fiziko-litologicheskih of properties in various directions, and in difficult character of distribution of layers-collectors on the area and a cut.

Movings of front of flood waters on a layer are everywhere observed frequent pereslaivanija and wedging out of the peschano-alevrolitovo-clay breeds, making essential impact on displacement processs of hydrocarbons from layers.

Porosity, permeability, petrosaturation on deposit Uzen were defined at designing of working out [42].

In a horizon structure certain geological law is marked: along with the accurate rhythmical structure presented by alternation of close-grained sandstones, siltstones, glin, thin proplastkov fossil rocks and marls, sites of the most sorted precipitate out sredne - and coarse-grained sandstones of reaching big thickness of 10-47,3 m. These sandy bodies are traced in the form of narrow strips in width of 200-700 m. For monolithic sandstones high values of permeability (0,2-1,0 мкм2 and more) and weak hydrodynamic communication with the basic part of the horizon, caused by sharp reduction of thickness of layers-collectors about 10-51 m to 0,6-1,5 m and pronitsaemostej to 0,05 microns are characteristic. Permeability changes in a wide range from 0,01 to 1,0 microns, however the most part nizkoproduktivnogo a cut to 78 % make layers-collectors with permeability from 0,01 to 0,1 мкм2.

The average value of permeability of XIV object does not exceed 50*103 microns that is characteristic for nizkopronitsaemyh collectors. According to GIS value of the average permeability for XIV makes KpR.sR willows =


0,247 microns. Kollektorsky properties (permeability) in a cut of XV horizon fluctuate from 0,01 to 1,0 microns, are characterised by the big degree of heterogeneity. For XV horizon the average value of permeability of collectors makes 0,179 мкм2, and the calculated average values on blocks fluctuate from 0,125 to 0,323 мкм2.

It is necessary to note still prominent feature of layers-collectors of XV horizon: at identical parametre of heterogeneity (a permeability variation factor - 1,26) for 4 horizons the basic lick (XIII, XV, XVI, XVII) XV horizon is characterised by the least centre size of permeability. Has less favorable conditions of replacement of oil, than compared horizons. According to GIS value of the average permeability for XV makes Kpr.sr.iv = 0,179 мкм2. According to GIS value of the average permeability for XVI makes Kpr.sr.vzv = 0,215 microns.

According to 142] XIII-XVIII horizons are characterised by following average values of the petrosated thickness, porosity and permeability.

Table 4.2

Horizon Type of a collector Permeability, мкм2 Porosity a share of a unit the Saturation Combined water Initial neftenasyshchen-nost XIII Terrigennyj, polimiktovyj 0,193 0,27 0,37 0,63 XIV Terrigennyj, polimiktovyj 0,247 0,25 0,36 0,64 XV Terrigennyj, polimiktovyj 0,179 0,23 0,39 0,61 XVI Terrigennyj, polimiktovyj 0,215 0,22 0,37 0,63 XVII Terrigennyj, polimiktovyj 0,276 0,24 0,37 0,63 XVIII Terrigennyj, polimiktovyj 0,179 0,24 0,43 0,57

In drawing photos of a core from a chink 6602 HSHgorizonta Uzeni, surfaces of the sample showing structure are resulted.


Depth: 1142,03 m Scale: 2,5 sm = 86,0 microns

In a picture In grain of strongly lixivialed feldspar of K.Eto typical shape of porosity of the yielded sample is shown


Depth: 1142,03 m Scale: 2,5 sm = 20,0 microns

This picture with strong increase shows] mezhgranuljarnyj kaolinite and stsementirovannyj calcite. It is possible to see, that kaolinite poorly substitutes calcite; it yields the basis to assume, that calcite settled after

For XIII-XVIII horizons Uzeni characteristicly high maintenance oblomochnyh breeds of quartz - 28 %, feldspars - 18 % and 14 % of fragments effuzivnyh breeds. On material composition oblomochnoj parts, sandy and alevrolitovye breeds-collectors fall into polimiktovym to differences grauvakkovogo type. Cement clay. The maintenance of a clay material makes to 40 % as a part of kaolinite, illita, chlorite, smektita. It is known, that g ".iny are the original catalyst of process gidrofobizatsii collectors.

Clay are one of the most widespread types of the rocks composing to 11 % of all volume of earth crust. Clay are formed by extremely small microcrystals on the size of clay minerals, which in


Much define properties of these breeds. Clay minerals fall into to group of laminated and sloisto-tape silicates. High dispersity of clay minerals is their natural physical condition. Usually size of microcrystals of these minerals in glinah does not exceed several micron. Particles of clay minerals have mainly platelet shape, however there are also particles in the form of strips, tubules, igolochek.

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A source: Kozhabergenov Murat Mokanovich. Substantiation of effective technologies doizvlechenija residual oil from obvodnennyh layers on an example of XIII horizon of deposit Uzen: Dis.... A Cand.Tech.Sci.: 25.00.17. - M: RGB, 2006. 2006

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