CN1749780A - Ternary classification method for oil and gas reservoir - Google Patents
Ternary classification method for oil and gas reservoir Download PDFInfo
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Abstract
The invention relates to a ternary classification method for oil and gas reservoirs. The method aims to provide a method for ternary classification of oil and gas reservoirs in oil and gas exploration and development. The method is characterized in that: the method comprises the following steps of firstly, investigating the geological condition of an oil reservoir to obtain basic data of the oil reservoir; secondly, determining the oil-containing flow property of a reservoir in a well in an oil reservoir according to the comprehensive interpretation result of logging oil gas display and electric logging; step three, drawing an oil reservoir cross section according to the recognition results and data in the step one and the step two; and fourthly, calculating the contribution values of the structure, the fault and the lithology to the control degree of the reservoir according to the recognition result of the reservoir and the reservoir profile, and naming the reservoir according to the table 1 and the figure 1 by utilizing the contribution values. The invention follows the scientificity and practicability of oil and gas reservoir classification, solves the quantitative classification problem of the conventional oil and gas reservoir, and leads the classification of the complex oil and gas reservoir to be more accurate.
Description
Technical field:
The present invention relates to ternary classifying method for oil and gas reservoir in oil-gas exploration and the exploitation.
Background technology:
There are many various hydrocarbon-bearing pools in nature, grasps the essential characteristic and the regularity of distribution of hydrocarbon-bearing pool and should at first classify to it.Classification of reserves is an important content in the petroleum geology research.It had both belonged to the research of basic theory, was again the very strong research of application.No matter in theory understanding or from the angle of production practices, it all is very necessary setting up rational classification of reserves method.
Take a broad view of classification of reserves method in the past, especially be purpose based on the exploration oil prospecting, usually all classify according to the trap form and the trap origin cause of formation, and brought into play vital role in the oil-gas exploration practice, the basis of this classification is that the exploration of oil gas shows as the trap exploration in practice.Along with deepening continuously of investigation and prospecting, people are also not the same to the understanding of trap notion.Be appreciated that the structure or the geologic unit that produce for by tectonic movement or deposition, also can be regarded as the elementary cell of enrichment oil gas.Exploration practices more and more shows, our hydrocarbon-bearing pool that seek and that search out, not the hydrocarbon-bearing pool that forms by single trap, especially middle low-permeability sandstone reservoir, form by the hydrocarbon-bearing pool that a plurality of scales are less, it may be the wrong folded sand body that forms of vertical different oil reservoir group or same oil reservoir group, or " the small-sized oil reservoir group " of the different little fault block composition on the plane.
In a word, seek the incompatible exploration idea from now on of theory of single enclosure of oil gas reservoir, as if serving as the classification that foundation is carried out hydrocarbon-bearing pool with the trap form, so, may also have so far the new trap type that does not take place, this that is to say that corresponding classification of reserves forever can not be perfect.From becoming mechanism aspect, Tibetan, the sorting technique theoretical property of some hydrocarbon-bearing pool is not strong, and principle is unclear, is difficult to operation in the work of reality sometimes.
Classification of reserves in the petroleum geology, can not only be satisfied with description to the trap form and the origin cause of formation, but classification of reserves should reflect the relation between the hydrocarbon-bearing pool origin cause of formation and each origin cause of formation, and hydrocarbon-bearing pool forms mechanism and become the inner link of Tibetan, so that draw the regional hydrocarbon-bearing pool regularity of distribution.
Summary of the invention:
The purpose of this invention is to provide a kind of new ternary classifying method for oil and gas reservoir in the oil-gas exploration and development, the science and the practicality of classification of reserves have been followed, especially the classification of the hydrocarbon-bearing pool of sandstone reservoir, solved the quantitative classification problem that conventional gas and oil is hidden, make the complex reservoir classification more accurate, what be convenient in oil-gas exploration and development to sum up the regularity of distribution of hydrocarbon-bearing pool and deeply be familiar with hydrocarbon-bearing pool becomes to hide mechanism, thus the economic benefit of raising oil-gas exploration and development.
The technical solution adopted in the present invention is: this ternary classifying method for oil and gas reservoir comprises following each step: the first step, investigate the geological condition of oil reservoir, and obtain the basic data of oil reservoir; In second step, determine well reservoir oil-containing fluidity matter in the oil reservoir according to well logging show of oil and gas and electric logging integrated interpretation result; In the 3rd step,, draw oil reservoir cruciform cross-section figure according to the first step and cognitive achievements and data in second step; The 4th step, according to the cognitive achievements of oil reservoir,, calculate structure, tomography and lithology contribution margin to the control degree that becomes to hide in conjunction with the oil reservoir sectional view, utilize numerical value to get final product again this oil reservoir is named according to table 1 and Fig. 1.
Table 1
| Class | Subclass | Group | |||
| Title (code) | Quantizating index (%) | Title (code) | Quantizating index (%) | Title (code) | Quantizating index (%) |
| Structure (g) | g≥75 | Tomography-structure (dg) | 75＞g≥50 d＞v | Lithology-tomography-structure (ydg) | 50＞g≥33 g＞d＞y |
| Lithology-structure (yg) | 75＞g≥50 v＞d | Tomography-lithology-structure (dyg) | 50＞g≥33 g＞y＞d | ||
| Tomography (d) | d≥75 | Structure-tomography (gd) | 75＞d≥50 g＞y | Lithology-structure-tomography (ygd) | 50＞d≥33 g＞g＞y |
| Lithology-tomography (yd) | 75＞d≥50 y＞g | Structure-lithology-tomography (gyd) | 50＞d≥33 d＞y＞g | ||
| Lithology (y) | v≥75 | Structure-lithology (gy) | 75＞v≥50 g＞d | Tomography-structure-lithology (dgy) | 50＞v≥33 y＞g＞d |
| Tomography-lithology (dy) | 75＞v≥50 d＞g | Structure-tomography-lithology (gdy) | 50＞v≥33 y＞d＞g | ||
Above-mentioned structure is meant that the structural deformation with the stratum is the condition of blocking; Tomography is meant that the reservoir is subjected to fault barrier in some direction; Lithology is meant to change the reservoir rerum natura variation cause or pinching owing to mode of deposition as the condition of blocking.
Hydrocarbon-bearing pool ternary classification be exactly the fundamental prerequisite that forms with reflection hydrocarbon-bearing pool be principle, be key element with structure, tomography and lithology, utilize triangular plot to represent as shown in Figure 1, hydrocarbon-bearing pool quantitatively is divided into 3 classes, 6 subclass and 6 groups as above shown in the table 1.
The meaning of hydrocarbon-bearing pool ternary classification is: it is from the ultimate principle that rich accumulation of oil and gas becomes to hide, and the formation of having illustrated any hydrocarbon-bearing pool is not by single factors control, just the degree difference of control.
Hydrocarbon-bearing pool ternary classification need become to hide key element to structure, tomography and three of lithology carries out quantitatively, and quantitative principle is with each key element the control degree that becomes to hide to be assessed, and the control degree that becomes the Tibetan just is meant contribution to the oil geologic reserve.
The invention has the beneficial effects as follows: adopting above-mentioned hydrocarbon-bearing pool ternary classification is that conventional gas and oil is hidden, and the especially classification of the hydrocarbon-bearing pool of sandstone reservoir does not comprise the classification of special reservoirs such as hydrodynamic force, crack and buried hill; Hydrocarbon-bearing pool ternary classification has solved the quantitative classification problem that conventional gas and oil is hidden, and methodological science, reasonable, practical makes the complex reservoir classification more accurate.Hydrocarbon-bearing pool ternary classification has disclosed the ultimate principle of hydrocarbon-bearing pool, and the formation of having illustrated any hydrocarbon-bearing pool is not the result by the single factors effect, and just control degree is different; Hydrocarbon-bearing pool ternary classification is hidden conventional gas and oil and is divided 3 classes, 6 subclass and 6 groups, and type is clear.Hydrocarbon-bearing pool is named can provide more one-tenth to hide information, uses the regularity of distribution that helps finding hydrocarbon-bearing pool in Exploration Domain.
Description of drawings:
Fig. 1 is a hydrocarbon-bearing pool ternary classification chart;
Fig. 2 is QJ oil reservoir Fuyu County oil reservoir oil reservoir sectional view;
Fig. 3 is the high four groups of oil reservoir oil reservoir sectional views of QJ oil reservoir;
Fig. 4 is the oil reservoir oil-bearing area figure of QJ oil reservoir Fuyu County;
Fig. 5 is the high four groups of oil reservoir oil-bearing area figure of QJ oil reservoir;
Fig. 6 is the oil reservoir ternary classification chart of high four groups of Fuyu County's oil reservoirs and high estrade oil reservoir.
Embodiment:
The invention will be further described below in conjunction with example: the process of the concrete enforcement of this ternary classifying method for oil and gas reservoir: the first step, investigate the geological condition of oil reservoir, the regional Petroleum geologic characteristics of research oil reservoir, mainly be the formation time and the mutual relationship of petroleum source bed, reservoir and cap rock, collect formation testing, well logging, earthquake and well data; Second step, utilize and get core well and formation testing data formulation effective pay thickiness standard, again according to well logging show of oil and gas and electric logging data, the purpose reservoir contains fluid properties in the integrated interpretation oil reservoir; The 3rd step, utilize seismic data establishment oil reservoir end face structural map, the structural map engineer's scale is 1: 25000 or 1: 50000, and proofreaies and correct with the drilling well individual-layer data.According to the first step and cognitive achievements and data in second step, draw oil reservoir cruciform cross-section figure, detect cognitive achievements is drawn a circle to approve oil reservoir on oil reservoir end face structural map oil-bearing area in conjunction with individual well formation testing and hydrocarbon; The 4th step, foundation in conjunction with oil reservoir sectional view, oil-bearing area figure, calculates structure, tomography and lithology to becoming to hide the contribution margin of control degree to the cognitive achievements of the synthetic study of oil reservoir, just, according to table 1 and Fig. 1 this oil reservoir is named then the contribution of geologic reserve.
Application example
The first step, the geological condition of investigation oil reservoir, the regional Petroleum geologic characteristics of research oil reservoir mainly is the formation time and the mutual relationship of petroleum source bed, reservoir and cap rock, collects formation testing, well logging, earthquake and well data.
The QJ oil reservoir is textural to be positioned at the neat family in northern central down warping region district, loose distant basin-Gu Long the North that caves in.Exploration fundamental purpose layer is Fuyu County's oil reservoir of four sections in the high estrade oil reservoir of two, three sections of Lower Cretaceous Series green hill mouth groups and spring.
For the structure of seeing clearly this district forms and evolution, utilize the prospect pit data to work out the high estrade in this district, Fuyu County's oil reservoir end face structural history planimetric map by recovering the palaeotectonics method, utilize seismic section to work out the structural history sectional view.
Find out that from Fuyu County's oil reservoir end face structural evolution trend when the green hill mouth is organized Nenjiang group deposition (100Ma-73Ma), the grand celebration placanticline is large-scale negative structure, be one high in the east and low in the west, the low paleoslope in high south, north.Qi Jiabei is in the loudspeaker-Sa structure west side of grand celebration placanticline, is in northwest height, the low paleoslope in the southeast this period always.After the Nenjiang group deposition (73Ma), because the lifting of difference structure has formed grand celebration placanticline blank, local area loudspeaker west nosing structure is also had a blank before the Yao Jia group deposition.The structure main body is between g702-g704-g703, and this tectonic framework remains to the open fire group always and deposits latter stage.Along with grand celebration placanticline structure amplitude increases, to Tai Kang group deposition end, the typing fully of grand celebration placanticline structure has also just formed loudspeaker west nosing structure group now the tectonic framework of local area based on loudspeaker west nosing structure.The uniclinal structure that the long-term inheritance of local area the is grown Yu Qijia depression oil generation center of pitching has certain sensing and inducing action to oil-gas migration.
Can find out that from the structural history sectional view local area middle-shallow layer tomography mainly contains three developmental stages.For the first time be that faulting is frequent, T in green hill mouth group deposition period
2Layer tomography is maximum, and be disconnected to TlG on the part
4Layer; For the second time be to deposit period in Yao Jia group-Nenjiang group, faulting a little less than, only grow indivedual minor faults; Be that constructed counter-rotating along with the large-scale tectonic movement in full basin this moment before Nenjiang group deposition deposited to the tertiary system later on for the third time, the fracture activity is stronger, the fracture of shallow faults and deep is joined, and trunk fracture turn-off increases, faults control the formation and the distribution of structural trapping.Be again that oil gas is given birth to waiting in a large number this moment, and tomography becomes the better channels of oil-gas migration.Therefore, this district's structure, fracture and oil gas generate has good space-time configuration relation, for rich accumulation of oil and gas has been created condition.
This is distinguished high estrade oil reservoir deposition and controlled by northern thing source, basin, sand body is mainly based on mouth bar, sand dam far away, sand sheet, sand body is ribbon, lensing and seat shape and distributes, the plane is wrong repeatedly in flakes, and major reservoir mainly concentrates on the high four groups of blue or green two, three pars infrasegmentalis stratum, and sand body is nearly north-south and stretches, general 4～15 layers of single layer of sand number, single sand layer thickness is generally at 1.2～4.2m, and boring and meeting the sandstone gross thickness is 9～34m, and sandy ground is than changing between 8～50%.The factor of porosity of reservoir mainly is distributed in 10～20%, and average pore is 15%, and permeability mainly is distributed in 0.2～34.8 * 10
-3μ m
2, mean permeability is 11.4 * 10
-3μ m
2
Fuyu County's oil reservoir deposition is influenced by mainly in northern thing source period, be the shallow lake deltaic deposit system, the main low-water level delta-front facies deposition of growing, sand body is based on waterborne, distributary channel and crevasse-splay deposit under water, nearly north-south spread is positioned at the main stem swing and is with that sandstone thickness is big, rerum natura good, and sand body transversely connectedness is poor, sand body is wrong repeatedly in flakes on the plane, has created condition for forming the large tracts of land lithologic oil pool.Fuyu County's oil reservoir list layer of sand number is generally at 4～8 layers, and single sand layer thickness is generally at 1.4～4.0m, and boring and meeting the sandstone gross thickness is 10～24m, and sandy ground is than changing between 12～35%.Fuyu County's oil reservoir distribution of porosity is 7～19%, and permeability distribution is 0.08～30 * 10
-3μ m
2, average pore is 12%, mean permeability is 5 * 10
-3μ m
2
According to OIL SOURCE CORRELATION research, this oil of distinguishing high four groups of oil reservoirs and Fuyu County's oil reservoir comes from the blue or green one section oil source rock of local area, but most oil sources is oblique from neat tame north orientation.
Collect formation testing (table 2), well logging (table slightly), earthquake (table slightly) and well data (table slightly).
Table 2 QJ oil reservoir formation testing tables of data
| Pound sign | Layer position | Perforated interval | Penetrate out thickness m | The number of plies | Small size layer | The formation testing mode | Day produce oil t/d | Daily gas m 3/d | Daily output water m 3/d | The formation testing conclusion |
| g701 | G-F | 1955-2248.8 | 21.6 | 9 | 33，34，37， | Gaslift | 3.98 | 0 | 1.92 | Oil-water-layer |
| g701 | F | 2176.1-2178 | 14 | 5 | 39-42，44 | MFE | 0.81 | 4.1 | 8.2 | Oil-water common-layer |
| g701 | F | 2186.2-2248.8 | 6.8 | 2 | 41，44 | Bailing | 0.035 | Low pay sand | ||
| g701 | F | 2176.8-2204.4 | 7.2 | 3 | 40,42, outer | Bailing | 0.47 | Low pay sand | ||
| g701 | G | 1955.0-2086.4 | 7.6 | 4 | 33，34，37 | Gaslift | 4.04 | 2.04 | Commercial oil reservoir | |
| g701 | S | 1695.4-1701.4 | 5.8 | 1 | 16 | Gaslift | 20.4 | Water layer | ||
| g701 | H | 1391.0-1396.0 | 5 | 1 | 11 | Gaslift | 1.74 | Water layer | ||
| g702 | F | 2100.2-2117.2 | 5.6 | 2 | 32，33 | MFE | 3.99 | 1.37 | Commercial oil reservoir | |
| g702 | G | 1769.0-1773.2 | 3 | 2 | 17，18 | MFE | 2.38 | Water layer | ||
| g702 | G | 1958.2-1991.2 | 8.2 | 4 | 29，b1，b2，b3 | Gaslift | 2.49 | Trace | Commercial oil reservoir | |
| g702 | F | 2100.2-2117.2 | 5.6 | 2 | 32，33 | MFE | 1.24 | Commercial oil reservoir | ||
| g702 | F | 2114.0-2117.2 | 3.2 | 1 | 33 | Pressure is taken out | ||||
| … |
Fuyu County's oil reservoir has 2 mouthfuls of wells to obtain high-voltage physics data to see Table 3.
Table 3 QJ oil reservoir Fuyu County oil reservoir high pressure property tables of data
| Pound sign | Reservoir pressure (MPa) | Original saturation pressure (MPa) | Initial gas-oil ratio (m 3/t) | Formation temperature | Volume factor | Compressibility coefficient | Shrinkage factor (%) | Underground oil density (g/m 3) | Underground viscosity of crude (mPa.s) | Solubility factor (m 3/m 3MPa) |
| G708 | 23.08 | 6.25 | 34.1 | 91.9 | 1.136 | 0.0013 | 11.99 | 0.7521 | 1.74 | 4.02 |
| G72 | 22.4 | 6.87 | 26.31 | 88.6 | 1.134 | 0.0015 | 11.81 | 0.7805 | 3.64 | 3.83 |
| On average | 30.2 | 1.135 | 0.7663 | 3.93 |
High estrade oil reservoir and Fuyu County's oil reservoir surface flow volume property see Table 4.
The high estrade of table 4 QJ oil reservoir, Fuyu County's reservoir fluid character statistical form
| Layer position | Oil property | Local water character | |||||||||||||
| Ground oil density (t/m 3) | Viscosity (mPas) | Solidifying point (℃) | Wax content (%) | Gel content (%) | Chloride ion content (mg/l) | Total mineralization (mg/l) | The water type | ||||||||
| MinimumMaximum | On average | MinimumMaximum | On average | MinimumMaximum | On average | MinimumMaximum | On average | MinimumMaximum | On average | MinimumMaximum | On average | MinimumMaximum | On average | ||
| G | 0.85760.8599 | 0.859 | 16.520.5 | 18.3 | 33.037.0 | 35.0 | 18.626.6 | 22.6 | 14.820.0 | 17.4 | 3139.24060.2 | 3599.7 | 7289.48879.6 | 8084.5 | NaHCO 3 |
| F | 0.8510.8639 | 0.858 | 10.033.7 | 22.0 | 31.037.0 | 34.3 | 25.339.8 | 30.7 | 9.412.0 | 10.8 | 1082.01964.8 | 1329.4 | 7029.510696.2 | 8496.2 | NaHCO 3 |
Second step, utilize and get core well and formation testing data formulation effective pay thickiness standard, again according to well logging show of oil and gas and electric logging data, the purpose reservoir contains fluid properties in the integrated interpretation oil reservoir.
1. formulate net thickness rerum natura lower limit standard:
QJ oil reservoir Fuyu County oil reservoir reservoir properties changes greatly, and nonuniformity is stronger, does not have typical lower limit layer, can't determine lower limit with the formation testing achievement, therefore utilizes the abundant core data of getting in this district, adopts the empirical statistics method to determine the rerum natura lower limit.Promptly do factor of porosity, the permeability histogram of getting core well section reservoir inner analysis sample that production capacity is arranged after the formation testing, get the about 10% place's correspondence of cumulative frequency the hole, ooze value and be lower limit (simultaneously with reference to sudden change more obviously locate), this value shows that maximum reserves is lost less than 10% below it, the rerum natura lower limit standard of determining is: factor of porosity is 9.0%, and permeability is 0.1 * μ m
2From the hole, ooze graph of a relation (figure slightly) as can be seen, factor of porosity 9.0% and permeability 0.1 μ m
2Mate.
2 mouthfuls of wells only in the high estrade oil reservoir area, main oil reservoir is not also got core, so do not formulate the rerum natura lower limit standard, all adopts electrical measurement criteria net thickness.
2. formulate the electrical lower limit standard of net thickness:
Because it is few that local area Fuyu County oil reservoir is introduced series, and carried out getting core, all the other are homemade series, do not make standard to introducing series, are foundation with the formation testing achievement, divide net thickness by the rerum natura lower limit standard, have only made the electrical lower limit standard of homemade series.3 mouthfuls of wells of high estrade oil reservoir (g701, g702, j62) are homemade series, consider that this district and neat tame southern area adjoin, and have similar one-tenth and hide condition, and reservoir lithology, rerum natura are basic identical, have therefore set up homemade series standard with neat family southern area.
3, formulate reservoir oil-water-layer discrimination standard:
Fuyu County's oil reservoir has been chosen the spontaneous potential curve of identification fluid properties in the logging suite, the dark three side direction resistivity curves of reflection true formation resistivity, set up and hand over draw (figure slightly), plate has been used 10 mouthfuls of wells, 15 layers in oil reservoir is with 6 layers on layer, 6 layers of water layers, miss 2 oil-water common-layers, plate precision 92.6%.Oil, profit, separatrix, pool are two oblique lines among the figure, and its top is the oil district, and the below is the pool, is the oil-water common-layer district between two oblique lines.Article two, the oblique line equation is respectively:
(RLL3D)=1.9019 (SP)-4.3636, top
(RLL3D)=1.9019 (SP)-10.091, below
In the formula: RLL3D---dark three side direction resistivity, Ω m;
SP-spontaneous potential amplitude, mv;
The high four groups of oil reservoirs of the QJ high estrade oil reservoir in area do not have the pure water layer of formation testing based on net pay zone, therefore do not make oil-water-layer and differentiate plate.
4, net thickness is accepted or rejected layer standard:
Every kind of logging trace has its characteristics on reflection lithology, rerum natura, oiliness, therefore trade-off curve establishment plate can be obtained effect preferably targetedly.Dark three side direction resistivity have reflected the true resistivity on stratum substantially, after eliminating calcareous, shale influence, generally increase along with oil saturation increases resistivity, and dried layer resistivity are lower, so dark three side direction resistivity can be distinguished oil reservoir effectively and do layer.What the acoustic travel time logging curve mainly reflected is the lithology and the factor of porosity of reservoir.
Fuyu County's oil reservoir is used 11 mouthfuls of wells, and 15 layers in oil reservoir with 6 layers on layer, is done 7 layers on layer, and 7 layers on calcium layer has been worked out dark three side direction resistivity and interval transit time and concerned plate, occurs 1 and is strayed into some plate precision 97.1%.Determined the net thickness criteria for classifying: dark three side direction resistivity 〉=12 Ω m, interval transit time 〉=225 μ s/m.
High estrade oil reservoir Senior Three, high four groups use that 8 layers in 2 mouthfuls of well oil reservoirs of local area have been worked out dark three side direction resistivity with the southern regional material point of neat family and microinverse resistivity, interval transit time concern plate, plate precision 94.5%.Determined the net thickness criteria for classifying: dark three side direction resistivity 〉=11 Ω m, interval transit time 〉=225 μ s/m, microinverse resistivity 〉=4.5 Ω m.
5, button low-resistance interlayer plate:
Fuyu County's oil reservoir is used 7 mouthfuls of wells, 10 layers in interlayer, 11 layers in non-interlayer, worked out the return degree plate of microinverse intermediate value and microinverse and deducted muddy intercalation, the return degree of microballoon 〉=28% occurs being strayed into 2 for deduction low-resistance interlayer standard, miss 1, plate precision 86%.
High estrade oil reservoir is used area, neat family south button low-resistance oil reservoir standard, and the return degree of microballoon 〉=27% is deduction low-resistance interlayer, plate precision 90.9%.
Above-mentioned plate precision satisfies the calculation of reserves requirement all more than 86%.
The electrical lower limit standard summary sheet of table 5 QJ oil reservoir net thickness
| Layer position | Logging suite | Accept or reject layer standard | Button low-resistance interlayer | ||
| Dark three side direction (Ω .m) | Microinverse (Ω .m) | Interval transit time (μ s/m) | Microinverse return (%) | ||
| F | Homemade series | 12 | 225 | 28 | |
| G4 | 11 | 4.5 | 225 | 27 | |
6, net thickness value:
According to the aforesaid net thickness criteria for classifying each well layer in the exploratory area being carried out net thickness divides.13 mouthfuls of wells in Fuyu County, g708 wellblock oil reservoir oil-bearing area, individual well accumulative total net thickness is respectively 2.0m～11.2m, and the well point arithmetic mean is 5.56m, and the area balance is 5.5m, and the calculation of reserves adopted value is 5.5m.
2 mouthfuls of wells in high four groups of oil reservoir g701 wellblock oil-bearing areas, net thickness is 2.4～3.1m, and the well point arithmetic mean is 2.75m, and the area balance is 2.1m, and the calculation of reserves adopted value is 2.1m.
The 3rd step, utilize seismic data establishment oil reservoir end face structural map, the structural map engineer's scale is 1: 25000 or 1: 50000 and proofreaies and correct with the drilling well individual-layer data.According to the first step and cognitive achievements and data in second step, draw oil reservoir cruciform cross-section figure again, detect cognitive achievements is drawn a circle to approve oil reservoir on oil reservoir end face structural map oil-bearing area in conjunction with individual well formation testing and hydrocarbon.
The reserves work area is by 3-D seismics achievement in 2003, unify to proofread and correct with the prospect pit individual-layer data, finally draw out this and distinguish high four groups of end faces and Fuyu County's oil reservoir end face structural map (figure slightly), the structural map engineer's scale is at 1: 25000 or 1: 50000, implemented the form of structure, tomography.The precision of structural map satisfies the requirement of calculating prognostic reserves.
According to the first step and cognitive achievements in second step and data drafting oil reservoir cruciform cross-section figure.
Fig. 2 is QJ oil reservoir Fuyu County oil reservoir oil reservoir sectional view;
Fig. 3 is the high estrade oil reservoir of a QJ oil reservoir oil reservoir sectional view.
Detect cognitive achievements is drawn a circle to approve oil reservoir on oil reservoir end face structural map oil-bearing area in conjunction with individual well formation testing and hydrocarbon.
Fig. 4 is the oil reservoir oil-bearing area figure of QJ oil reservoir Fuyu County;
Fig. 5 is the high four groups of oil reservoir oil-bearing area figure of QJ oil reservoir.
In the 4th step, foundation in conjunction with oil reservoir sectional view, oil-bearing area figure, estimates structure, tomography and lithology to becoming to hide the contribution margin of control degree to the cognitive achievements of the synthetic study of oil reservoir, according to table 1 and Fig. 1 this oil reservoir is named again.
QJ oil reservoir oil prognostic reserves calculate and divide two oil reservoir groups: the first, and Fuyu County's oil reservoir group; The second, high estrade oil reservoir is high four groups:
The first, Fuyu County's oil reservoir group:
The sand body of this Fuyu County, district oil reservoir is based on waterborne, distributary channel and crevasse-splay deposit under water, nearly north-south spread, be positioned at main stem swing and be with that sandstone thickness is big, rerum natura good, sand body is transversely connective poor, sand body is wrong repeatedly in flakes on the plane, and the oil reservoir of formation is controlled in the good organic cooperation of preserving sand body and nosing structure background that is subjected to reservoir properties jointly.Oil reservoir vertical water distribution relation that oils in Fuyu County's is simpler, is mainly the water that oils down, and the part is the pure oil of full section.Oil reservoir focuses mostly in oil reservoir middle and upper part, Fuyu County, and reservoir buried depth is at 1958.2-2248.8m, and oil reservoir middle part buried depth 2106.5m, oil column height be at 19.2-73.8m, average oil column height 52.5m.The whole district does not have unified water-oil interface, the plane profit distributes certain regularity of distribution generally, the oil reservoir number of plies is many in the structure high-order bit, but the rich accumulation of oil and gas degree depends primarily on the quality of sandstone development situation and reservoir properties, and the g708 well productivity that is positioned at the structure top is higher.
Petroleum-in-place calculates presses the reserves code requirement, adopts volumetric method to calculate, and its basic calculating formula is as follows:
N＝100·A·H·Ф·S
oi·ρ/B
oi
In the formula: A-oil-bearing area
H-average effective thickness
Ф one average effective factor of porosity
S
Oi-oil saturation
ρ-average oil density
B
Oi-average external volume coefficient
Fuyu County's oil reservoir is by a calculation of reserves unit, and the reserves parameter sees Table 6, and oil prediction geologic reserve is 3101 * 10
4T.
1. the oil-bearing area 98km of structural factor control
2, that become to have hidden in the district has 2～5 a floor sand body, and the net thickness of 6 mouthfuls of prospect pits such as g701, g702, g704, g705, g708, j8 is respectively 5.2m, 4.4m, 4.3m, 4.8m, 3.4m, 2.0m, and average effective thickness is 4.0m, and unit reserve factor is 5.0 * 10
4T/km
2.m.
Geologic reserve: Q=unit reserve factor * average effective thickness * oil-bearing area
＝5.0×4.0×98.0
＝1960×10
4t
The percentage that the petroleum-in-place of structural factor accounts for total geologic reserve is: 1960/3101=63.2%.
2. lithology is the second one-tenth Tibetan factor, and many lensing sand bodies become good oil reservoir, and g708 well high yield and its rerum natura have much relations well, and No. 43 floor of g704 well are single lensing sand bodies, and net thickness is respectively 2.1m; Also having No. 29 floor of j72 well, No. 26 floor of j8, No. 94 floor of j81 all is that net thickness is respectively 4.4m, 2.0m, 2.1m, 4.4m because of lithology pinching or lensing sand body one-tenth Tibetan, and average effective thickness is 3.2m, tar sands bulk area 45.0km
2, unit reserve factor is 5.0 * 10
4T/km
2.m.
Geologic reserve: Q=unit reserve factor * average effective thickness * oil-bearing area
＝5.0×3.2×45.0
＝720×10
4t
The percentage that the petroleum-in-place of lithology factor accounts for total geologic reserve is: 720/3101=23.2%.
3. tomography blocks into the Tibetan effect to sand body out of the ordinary, but less than lithology, 110,111, No. 112 floor of 92, No. 94 floor and g72 wells of j81 all are that net thickness is respectively 2.4m, 2.6m because of fault barrier becomes the Tibetan to the control action of become hiding, average effective thickness 2.5m, oil-bearing area 33.6km
2, unit reserve factor is 5.0 * 10
4T/km
2.m.
Geologic reserve: Q=unit reserve factor * average effective thickness * oil-bearing area
＝5.0×2.5×33.7
＝421×10
4t
The percentage that the petroleum-in-place of tomography factor accounts for total geologic reserve is: 421/3101=13.6%.
In a word, structure, lithology and the tomography element of QJ oil reservoir Fuyu County oil reservoir is respectively 63.2%, 23.2%, 13.6% to becoming to hide control degree, and therefore, this block Fuyu County oil reservoir is lithology-structural oil pool (Fig. 2, Fig. 4, Fig. 6).
The second, high estrade oil reservoir is high four groups:
High four groups of oil reservoirs are positioned on blue or green one section petroleum source bed, should keep profit to one-tenth, but tomography is few because it is leading edge distributary channel and sand dam far away in the cover delta, and sand body is grown, owing to lack the condition of blocking, the sand body negligible amounts that becomes to hide.Petroleum-in-place calculates presses the reserves code requirement, adopts volumetric method to calculate, and its basic calculating formula is as follows:
N＝100·A·H·Ф·S
oi·ρ/B
oi
In the formula: A-oil-bearing area
H-average effective thickness
Ф-average effective factor of porosity
S
Oi-oil saturation
ρ-average oil density
B
Oi-average external volume coefficient
High four groups of oil reservoirs are by a calculation of reserves unit, and the reserves parameter sees Table 6, and oil prediction geologic reserve is 305 * 10
4T.
1. tomography is the first one-tenth Tibetan factor, and No. 39 floor of g701 well are the distributary channel sand bodies in the district, is subjected to fault barrier to become to hide at updip direction, and net thickness is 1.4, control oil-bearing area 24.0km
2(table 6), unit reserve factor are 6.1 * 10
4T/km
2.m.
The geologic reserve of faults control: Q=unit reserve factor * average effective thickness * oil-bearing area
＝6.1×1.4×24.0
＝205×10
4t
The percentage that the petroleum-in-place of tomography factor accounts for total geologic reserve is: 205/305=67.2%.
2. lithology is the second one-tenth Tibetan factor, become the 4 floor sand body that have of Tibetan in the district, 34, No. 37 floor of g701 well and 66, No. 74 floor of g709 well are lensing sand bodies, and net thickness is respectively 1.3m, 0.4m, 1.0m, 1.4m, two mouthfuls of well average effective thickness are 2.0m, control oil-bearing area 8.2km
2, unit reserve factor is 6.1 * 10
4T/km
2.m.
The geologic reserve of lithologic character controlling: Q=unit reserve factor * average effective thickness * oil-bearing area
＝6.1×2.0×8.2
=100 * 10
4The percentage that the petroleum-in-place of t lithology factor accounts for total geologic reserve is: 100/305=32.8% (table 6).
3. structural factor has certain effect to becoming to hide, because this oil reservoir is in the nosing structure leading edge, the oil column height of oil reservoir is more than 30 meter, structure is hidden being gathered into of oil and is had certain effect, high four groups of oil reservoirs of the g72 well in oil reservoir west side are in lower position, formation testing has also obtained industry oil stream, illustrates to construct this one-tenth of distinguishing high four groups of oil reservoirs can not hidden absolute effect.Concern that with reference to the oil column height of g701 well and the high four groups of oil reservoirs of g709 well and the rerum natura of reservoir sand body structural factor should be about 10% to the accretion of stock that becomes to hide, lithology factor and tomography factor respectively deduct 5% so.
In a word, the tomography of the high four groups of oil reservoirs of QJ oil reservoir, lithology, structure element are respectively 27.8% and 62.2%, 10.0% to becoming to hide control degree.Therefore, the high four groups of oil reservoirs of QJ oil reservoir are lithology one tomography oil reservoirs (Fig. 3, Fig. 5, Fig. 6).
Table 6 QJ oil reservoir ternary key element controlled reserve is calculated detail list
| Layer position | The wellblock | The reserves parameter | Geologic reserve 10 4t | Account for reserves number percent (%) | ||||||
| Oil-bearing area km | Net thickness m | Net porosity % | Oil saturation % | Oil density t/m 3 | Volume factor | Unit reserve factor 10 4t/ km 2.m | ||||
| G N | G701 | 24.0 | 2.1 | 15 | 54 | 0.859 | 1.151 | 6.1 | 305 | |
| Structure | ||||||||||
| Lithology | 8.2 | 2.0 | 6.1 | 100 | 32.8 | |||||
| Tomography | 24 | 1.4 | 6.1 | 205 | 67.2 | |||||
| F | G708 | 113.0 | 5.5 | 12 | 55 | 0.858 | 1.135 | 5.0 | 3101 | |
| Structure | 98.0 | 4.0 | 5.0 | 1960 | 63.2 | |||||
| Lithology | 45.0 | 3.2 | 5.0 | 720 | 23.2 | |||||
| Tomography | 33.7 | 2.5 | 5.0 | 421 | 13.6 | |||||
| Add up to | 113.0 | 3406 | ||||||||
(annotate: above-mentioned geologic reserve is the prediction petroleum-in-place)
Claims (4)
1. ternary classifying method for oil and gas reservoir is characterized in that: comprise following each step:
The first step is investigated the geological condition of oil reservoir, obtains the basic data of oil reservoir;
In second step, determine well reservoir oil-containing fluidity matter in the oil reservoir according to well logging show of oil and gas and electric logging integrated interpretation result;
In the 3rd step,, draw oil reservoir cruciform cross-section figure according to the first step and cognitive achievements and data in second step;
The 4th step, according to the cognitive achievements of oil reservoir,, calculate structure, tomography and lithology contribution margin to the control degree that becomes the Tibetan in conjunction with the oil reservoir sectional view, utilize contribution margin to name then to this oil reservoir.
2. ternary classifying method for oil and gas reservoir according to claim 1 is characterized in that: structure is meant that the structural deformation with the stratum is the condition of blocking.
3. ternary classifying method for oil and gas reservoir according to claim 1 is characterized in that: tomography is meant that the reservoir is subjected to fault barrier in some direction.
4. ternary classifying method for oil and gas reservoir according to claim 1 is characterized in that: lithology is meant owing to mode of deposition changes the reservoir rerum natura variation or the pinching conduct that cause blocks condition.
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