CN109458175A - The prediction technique of reservoir oil saturation under a kind of Overpressure Condition - Google Patents
The prediction technique of reservoir oil saturation under a kind of Overpressure Condition Download PDFInfo
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- CN109458175A CN109458175A CN201811356278.7A CN201811356278A CN109458175A CN 109458175 A CN109458175 A CN 109458175A CN 201811356278 A CN201811356278 A CN 201811356278A CN 109458175 A CN109458175 A CN 109458175A
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- oil saturation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention discloses a kind of prediction techniques of reservoir oil saturation under Overpressure Condition: (1) carrying out the statistics of Measured formation pressure, while carrying out the prediction of strata pressure by equivalent depth method；(2) it calculates superpressure area hydrocarbon primary rock producing hydrocarbon and is pressurized power value, the power as superpressure area Hydrocarbon Formation Reservoirs；(3) it chooses Reservoir Section and carries out rock core pressure mercury experiment, simulate the process of oily driven water-replacing during hydrocarbon reservoiring into the process of a certain rock sample hole under the conditions of certain pressure (power) by mercury；(4) it is established into mercury pressure by pressure mercury experiment with into the curved line relation plate of mercury saturation degree, the hydrocarbon power value that superpressure area calculates is corresponded in relationship plate, corresponding saturation degree is exactly the reservoir oil saturation predicted.Method of the invention is primarily adapted for use in the prediction of the reservoir oil saturation under Overpressure Condition, also has certain reference to the reservoir prediction of oil saturation under other pressure environments.
Description
Technical field
It is specifically a kind of to pass through superpressure ring the present invention relates to a kind of prediction technique of reservoir oil saturation under Overpressure Condition
The calculating of Hydrocarbon Formation Reservoirs power combines the method for carrying out predicting reservoir oil saturation with the pressure mercury data of reservoir under border, belongs to oil
Gas is at hiding correlation theory research, technical application and oil-gas field geology Exploration Domain.
Background technique
Reservoir prediction of oil saturation is an important research work in petroleum and gas geology and exploration, it is in research basin
The fluid properties of reservoir and the regularity of distribution of oil gas have important directive significance, while it is evaluation oil reservoir production capacity, meter again
It calculates petroleum-in-place and works out the important parameter of oilfield development program.Determine that the method for reservoir oil saturation is main at present
There are two types of: rock core direct measuring method and interpretation of logging data method.Wherein rock core direct measuring method is to oil-base core drilling or close
It closes the rock core that coring mode is got directly to be measured, obtains core oil saturation, and then obtain the oil saturation of reservoir,
This is presently the most accurate method, but is limited by coring data, while the oil saturation expense that rock core directly measures
Higher, the quantity of measurement is relatively fewer.Interpretation of logging data method be usually according to Archie formula Indirect evaluation oil saturation,
Some litho-electric parameters a, m and bs, n of the result of evaluation depending on the resistivity of reservoir, porosity and reservoir, due to underground rock
Property complexity, the litho-electric parameters of different Reservoir Bodies have biggish difference, this gives the accuracy of well log interpretation oil saturation
Bring certain difficulty.
Summary of the invention
For the above-mentioned prior art, the present invention provides a kind of prediction technique of reservoir oil saturation under Overpressure Condition,
It is to be combined by the calculating of Hydrocarbon Formation Reservoirs power under Overpressure Condition with the pressure mercury data of reservoir come predicting reservoir oil saturation
New method, under conditions of the physical property condition of reservoir a certain for superpressure area is essentially identical, power value can be pressurized by hydrocarbon
Calculating combine prediction to realize superpressure area reservoir oil saturation with the experiment of the pressure mercury of certain point.
The present invention is achieved by the following technical solutions:
The prediction technique of reservoir oil saturation under a kind of Overpressure Condition, comprising the following steps:
(1) pressure data and well-log information are surveyed from superpressure area fixed well, carries out statistics (the actual measurement pressure of Measured formation pressure
The statistics of power is a basic job, can refer to " formation pressure system parses Organic geochemistry now ", " Weihe River Bei Aoxiankongdian group
Strata pressure development characteristics and history of evolution " etc.), while stratum is carried out by equivalent depth method using well logging sonic differential time data
The prediction of pressure (technology is the prior art, can refer to " origin mechanism and logging prediction of Chexi area abnormal high pressure ")；
(2) on the basis of measured formation pressure data and equivalent depth method prediction of formation pressure, superpressure area hydrocarbon source is calculated
Rock hydrocarbon pressurization power value (it is hydrocarbon pressurization power value that measured formation pressure data, which subtracts the pressure of equivalent depth method calculating),
Using hydrocarbon pressurization power value as the power of superpressure area Hydrocarbon Formation Reservoirs；
(3) it for area's coring data is studied, chooses Reservoir Section and carries out rock core pressure mercury experiment, by mercury in certain pressure
Process (the rock core pressure of oily driven water-replacing during hydrocarbon reservoiring is simulated under the conditions of (power) into the process of a certain rock sample hole
Mercury experiment is a kind of routine experiment means that laboratory obtains core porosity, can refer to " mercury injection method research rock core pore structure
Feature ")；
(4) by pressure mercury experiment establish into mercury pressure with into the curved line relation plate (method for establishing curve of mercury saturation degree
For the prior art, i.e., by the method for statistics into mercury pressure value with into mercury intensity value on Excel opening relationships template),
The hydrocarbon power value that superpressure area calculates is corresponded in relationship plate and (is referred to the hydrocarbon power value of calculating as into mercury pressure
Value), corresponding saturation degree is exactly the reservoir oil saturation predicted.
The prediction technique of reservoir oil saturation under Overpressure Condition of the invention is the hydrocarbon by calculating under Overpressure Condition
Pressurization power stores up under a certain accumulation dynamics with determining into mercury pressure with the relationship into mercury saturation degree for mercury experiment acquisition is pressed
The calculation method of the oil saturation of layer, prediction principle are as follows: theoretical according to classical Hydrocarbon Formation Reservoirs, oil gas mainly takes at hiding
Certainly in pools' forming dynam- and the coupling at hiding resistance, pools' forming dynam- is primarily referred to as the power that driving oil gas is migrated forward, into hiding resistance
It is primarily referred to as the power for preventing oil gas from migrating forward, the process of Hydrocarbon Formation Reservoirs is exactly that pools' forming dynam- constantly overcomes into hiding resistance driving oil
Gas is migrated forward drives the process of water in foramen primum gap side by side.It is exactly to pass through mercury at certain pressure (power) that rock core pressure mercury, which tests its principle,
Under the conditions of enter the process of a certain rock sample hole to simulate the process of oily driven water-replacing during hydrocarbon reservoiring.Pass through a certain rock sample
Press mercury experiment obtain into mercury pressure with into mercury saturation degree relationship it is known that into mercury pressure be greater than breakthrough pressure after with into
Positive correlation is often presented in mercury saturation degree.That is, the power of Hydrocarbon Formation Reservoirs is bigger, the oil saturation of reservoir is higher.
Under Overpressure Condition, the power of Hydrocarbon Formation Reservoirs is mainly the hydrocarbon pressurization power of hydrocarbon source rock, and the resistance at hiding is the capillary of reservoir
Guan Li.Be pressurized power by the hydrocarbon that calculates under Overpressure Condition and press that mercury experiment obtains into mercury pressure with into the pass of mercury saturation degree
System can determine the oil saturation of reservoir under a certain accumulation dynamics.
Prediction technique of the invention, by the hydrocarbon power of superpressure area hydrocarbon source rock and pressure mercury experiment obtain into mercury pressure with into
Mercury saturation degree relation curve combines, propose it is a kind of superpressure area it is easy to operate, can be widely applied in oil field prospecting deployment
Oil saturation calculation method.This method further enriches the calculation method of oil saturation, be properties of fluid in bearing stratum with
And the prediction of oiliness provides new Research Thinking and technological means.Method of the invention is primarily adapted for use under Overpressure Condition
The prediction of reservoir oil saturation also there is certain reference to anticipate the reservoir prediction of oil saturation under other pressure environments
Justice.
The various terms and phrase that the present invention uses are with well known to a person skilled in the art general senses.
Detailed description of the invention
Fig. 1: the new method operational flowchart of prediction superpressure area reservoir oil saturation of the invention.
Fig. 2: the prediction of oil saturation figure that a well reservoir porosity in superpressure area is 11.5% in the specific embodiment of the invention.
Fig. 3: the prediction of oil saturation figure that a well reservoir porosity in superpressure area is 13.9% in the specific embodiment of the invention.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated.However, the scope of the present invention is not limited to following realities
Apply example.One of skill in the art, can be to the present invention it is understood that under the premise of without departing substantially from the spirit and scope of the present invention
Carry out various change and modification.
Instrument involved in following embodiments, reagent, material etc. are unless otherwise noted existing in the prior art
Conventional instrument, reagent, material etc., can be obtained by regular commercial sources.Experimental method involved in following embodiments, inspection
Survey method etc. is unless otherwise noted existing routine experiment method in the prior art, detection method etc..
The prediction technique of reservoir oil saturation under 1 Overpressure Condition of embodiment
Steps are as follows (flow chart is as shown in Figure 1):
(1) calculating of (step 101) observed pressure statistics and log pressure
Pressure data and well-log information are surveyed from superpressure area fixed well, carries out the statistics of Measured formation pressure, utilizes simultaneously
Well logging sonic differential time data carries out the prediction of strata pressure by equivalent depth method.
(2) calculating of (step 102) hydrocarbon pressurization power
On the basis of measured formation pressure data and equivalent depth method prediction of formation pressure, superpressure area primary rock producing hydrocarbon is calculated
Hydrocarbon is pressurized power value, using hydrocarbon pressurization power value as the power of superpressure area Hydrocarbon Formation Reservoirs.
(3) (step 103) carries out rock core pressure mercury experiment
For research area, coring data, selection Reservoir Section carry out rock core and press mercury experiment, (dynamic in certain pressure by mercury
Power) under the conditions of enter the process of a certain rock sample hole to simulate the process of oily driven water-replacing during hydrocarbon reservoiring, and record into
Mercury pressure and corresponding into mercury intensity value.
(4) (step 104) establish into mercury pressure with into the relation curve of mercury saturation degree
On the basis of rock core pressure mercury experiment, established into mercury pressure value and into mercury intensity value into mercury pressure according to statistics
With the relation curve into mercury saturation degree.
(5) prediction of (step 105) superpressure area reservoir oil saturation
By the hydrocarbon of calculating pressurization power value correspond into mercury pressure on mercury saturation degree relation curve, corresponding saturation
Degree is exactly the reservoir oil saturation predicted, to realize the prediction of superpressure area reservoir oil saturation.
Application example (using a well 3585m two blocks of rock cores as example, be porosity 11.5% and porosity respectively
13.9% two block of rock core): research object is the wellblock a of A recess, passes through the statistics and interval transit time of the wellblock a Measured formation pressure
The calculating of strata pressure shows that the wellblock is superpressure area.It is calculated according to Measured formation pressure value and interval transit time value formation pressure
Hydrocarbon of the well at buried depth 3585m is pressurized power value out, and from the point of view of the result of calculating (table 1), hydrocarbon is pressurized power value can be with
Reach 8.14Mpa.
1 superpressure area a well hydrocarbon of table is pressurized power value tables of data
Meanwhile we according to research area a well buried depth 3585m at, porosity be 11.5% and 13.9% rock core pressure mercury
Data, establish into mercury pressure and into mercury saturation degree relation curve (as shown in Figure 2 and Figure 3, the unit in figure into mercury pressure is
MPa, the unit into mercury saturation degree are %, and the unit of porosity is %), the hydrocarbon pressurization power value of calculating is corresponded into mercury pressure
For power on mercury saturation degree relation curve, corresponding saturation degree is exactly the reservoir oil saturation predicted.
From the point of view of the result of prediction, the oil saturation which is 11.5% is about 67.5%, porosity is
13.9% oil saturation is about 72%.And the oil saturation that practical logging is explained is respectively 66.95%, 71.55%, two
The error of person is very small, and precision is very high, it is seen then that prediction technique of the invention has good dependable with function.
Above-described embodiment is provided to those skilled in the art, how to implement and use to be advocated with full disclosure and description
Embodiment, rather than for limiting range disclosed herein.Obvious modification will to those skilled in the art
Within the scope of the appended claims.
Claims (5)
1. the prediction technique of reservoir oil saturation under a kind of Overpressure Condition, it is characterised in that: the following steps are included:
(1) pressure data and well-log information are surveyed from superpressure area fixed well, carries out the statistics of Measured formation pressure, while utilizing survey
Well interval travel time data carries out the prediction of strata pressure by equivalent depth method；
(2) on the basis of measured formation pressure data and equivalent depth method prediction of formation pressure, superpressure area primary rock producing hydrocarbon is calculated
Hydrocarbon is pressurized power value, using hydrocarbon pressurization power value as the power of superpressure area Hydrocarbon Formation Reservoirs；
(3) it for area's coring data is studied, chooses Reservoir Section and carries out rock core pressure mercury experiment, through mercury under the conditions of certain pressure
The process of oily driven water-replacing during hydrocarbon reservoiring is simulated into the process of a certain rock sample hole；
(4) it is established by pressure mercury experiment into mercury pressure and into the curved line relation plate of mercury saturation degree, the hydrocarbon that superpressure area is calculated
Power value corresponds in relationship plate, and corresponding saturation degree is exactly the reservoir oil saturation predicted.
2. the prediction technique of reservoir oil saturation under Overpressure Condition according to claim 1, it is characterised in that: the step
Suddenly in (2), hydrocarbon is pressurized the calculation of power value are as follows: measured formation pressure data subtracts the pressure of equivalent depth method calculating.
3. the prediction technique of reservoir oil saturation under Overpressure Condition according to claim 1 or 2, it is characterised in that: institute
It states in step (4), the concrete mode into mercury pressure and the curved line relation plate into mercury saturation degree is established by pressure mercury experiment are as follows: logical
Cross statistics method into mercury pressure value with into mercury intensity value on Excel opening relationships template.
4. the prediction technique of reservoir oil saturation under Overpressure Condition according to claim 1 or 2 or 3, it is characterised in that:
In the step (4), the hydrocarbon power value that superpressure area calculates is corresponded into the concrete mode in relationship plate are as follows: the life of calculating
Hydrocarbon power value corresponds to relationship plate as into mercury pressure value.
5. the prediction technique of reservoir oil saturation, feature under Overpressure Condition according to any one of claims 1 to 4
Be: steps are as follows:
(1) calculating of observed pressure statistics and log pressure: pressure data and well-log information are surveyed from superpressure area fixed well, is carried out
The statistics of Measured formation pressure, while passing through the prediction of equivalent depth method progress strata pressure using well logging sonic differential time data；
(2) calculating of hydrocarbon pressurization power: on the basis of measured formation pressure data and equivalent depth method prediction of formation pressure,
It calculates superpressure area hydrocarbon primary rock producing hydrocarbon and is pressurized power value, using hydrocarbon pressurization power value as the power of superpressure area Hydrocarbon Formation Reservoirs；
(3) carry out rock core pressure mercury experiment: for area's coring data is studied, choosing Reservoir Section and carry out rock core pressure mercury experiment, pass through
Mercury simulates oily driven water-replacing during hydrocarbon reservoiring under the conditions of certain pressure (power) into the process of a certain rock sample hole
Process, and record into mercury pressure and corresponding into mercury intensity value；
(4) establish into mercury pressure with into the relation curve of mercury saturation degree: the rock core pressure mercury experiment on the basis of, according to statistics into
Mercury pressure value and into mercury intensity value establish into mercury pressure with into the relation curve of mercury saturation degree.
(5) prediction of superpressure area reservoir oil saturation: by the hydrocarbon of calculating pressurization power value correspond into mercury pressure with into mercury
On saturation degree relation curve, corresponding saturation degree is exactly the reservoir oil saturation predicted.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110107283A (en) * | 2019-04-26 | 2019-08-09 | 中国石油化工股份有限公司 | The method and system of Accumulation zone prediction are carried out according to potential energy value and physics value |
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