CN112034513B - Quantitative evaluation method for peripheral potential resource quantity of developed oil field - Google Patents
Quantitative evaluation method for peripheral potential resource quantity of developed oil field Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
- G01V1/282—Application of seismic models, synthetic seismograms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
- G01V1/30—Analysis
- G01V1/306—Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/62—Physical property of subsurface
- G01V2210/624—Reservoir parameters
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Abstract
The invention relates to a quantitative evaluation method for the quantity of potential resources around developed oil fields, which comprises the following steps: analyzing the development rule of a reservoir around a developed oil field based on a high-resolution sequence stratigraphic evolution rule, and locking the development position of a favorable reservoir; b, searching a seismic reflection interface corresponding to a middle period gyration datum plane adjacent to the favorable reservoir development position depth, performing horizon interpretation, searching potential sand bodies and numbering the potential sand bodies; c, carrying out multi-factor analysis aiming at the potential sand bodies, evaluating each potential sand body, and defining a potential reserve unit; d, determining the reserve calculation parameters of the potential reserve unit, and calculating the reserve of the potential sand body. The method can be widely applied to potential sand body reserve calculation of developed peripheral oil fields of offshore oil fields, and is beneficial to further exploration and development of offshore oil fields.
Description
Technical Field
The invention relates to a quantitative evaluation method for the amount of potential resources around a developed oil field, and belongs to the technical field of oil and gas field development.
Background
After years of development, offshore oilfields gradually enter a double-high development stage with high extraction degree and high water content, and the difficulty of stable production is increased day by day. Meanwhile, the difficulty of new oil field discovery is increased along with the continuous improvement of exploration degree. In view of the similar reservoir conditions of the periphery of the developed oil field and the main body area of the oil field, the oil field has certain reservoir increasing potential and is an advantageous replacing area of the developed area. Therefore, based on the structural interpretation and reserve evaluation and prediction conditions of the target oil field, potential reserves of peripheral undeveloped oil fields are considered on the basis of comprehensively planning favorable reservoirs of the whole oil field, the direction is indicated for the next adjustment of excavation and submergence of the oil field, and the method has important significance for improving the reservoir exploitation level of the oil field and increasing the reserve replacement of the oil field.
At present, most developed oil fields in Bohai sea are facing to the problems of few peripheral data and difficult quantification of potential reserves, and particularly, for potential sand bodies of peripheral oil fields without or with few wells, how to quantify reserve calculation parameters such as oil-bearing area, effective thickness, effective porosity, oil-bearing saturation, volume coefficient and the like of the potential sand bodies in the reserve calculation is not formed, and at present, a set of quantitative evaluation method for the peripheral potential resource quantity of the developed oil fields is not formed.
Disclosure of Invention
Aiming at the outstanding problems, the invention provides a quantitative evaluation method for the quantity of potential resources around developed oil fields, which searches potential sand bodies around the developed oil fields on the basis of researching the development rule of a reservoir, comprehensively carries out multi-factor analysis on oil-gas-containing zones, oil source faults, construction positions, the situation of the surrounding trapped oil and gas reservoirs and the situation of the surrounding drilled wells of each potential sand body, evaluates whether the potential sand body has the potential, carries out reserve calculation on the potential sand body with the potential and realizes the quantification of potential sand body reserve units around the developed oil fields.
In order to realize the purpose, the invention adopts the following technical scheme:
a quantitative evaluation method for the amount of potential resources around developed oil fields comprises the following steps:
analyzing development rules of reservoirs around developed oil fields based on high-resolution sequence stratigraphic evolution rules, and locking development positions of favorable reservoirs;
b, searching a seismic reflection interface corresponding to a middle-period gyrating datum plane adjacent to the favorable reservoir development position depth, performing horizon interpretation, then extracting seismic attributes, analyzing the favorable reservoir development position in the period, searching potential sand bodies and numbering the potential sand bodies;
c, carrying out multi-factor analysis aiming at the potential sand bodies, evaluating each potential sand body, and defining a potential reserve unit;
d, determining the reserve calculation parameters of the potential reserve unit, and calculating the reserve of the potential sand body.
Preferably, in the quantitative evaluation method, in the step a, the favorable reservoir development position is a favorable reservoir development position obtained by dividing a medium cycle of the reservoir based on analysis of a high-resolution sequence stratigraphic evolution law, and a transition region of a medium cycle datum plane from water recession to water inflow transition is the favorable reservoir development position.
Preferably, the step b comprises the following steps:
b1, performing horizon interpretation on a seismic reflection interface corresponding to the medium-period cycle datum plane, and using the horizon interpretation as a reference horizon for potential sand body analysis;
b2, selecting a corresponding reference horizon as a top interface according to the favorable reservoir development position depth, and drifting the top interface for a certain time window length according to the reservoir development thickness to serve as a bottom interface of the potential sand body development period;
b3, extracting amplitude seismic attributes from the seismic data between the top interface and the bottom interface in the step b2, judging the development position of the favorable reservoir stratum in the deposition period according to the plane distribution of the amplitude seismic attributes, and numbering the potential sand bodies.
Preferably, in the step c, the following multi-factor analysis is performed on each potential sand body searched in the step b:
(1) The oil-gas-containing zone: according to the recognition of regional accumulation rules, the method is divided into a favorable zone and a non-favorable zone, wherein the favorable zone needs to simultaneously meet two conditions of being close to an oil source fault and being positioned on a fault rising plate; (2) oil source fault: an oil source fault and a non-oil source fault, wherein the oil source fault is a fault communicating a reservoir with a hydrocarbon source rock; (3) construction position: a structure high part and a structure low part, wherein the structure high part is positioned on the ascending disc, and the structure low part is positioned on the descending disc; (4) peripheral implementation reservoir conditions: drilling the same or adjacent blocks to meet the oil and gas reservoir in the same period and not to drill the oil and gas reservoir; (5) peripheral drilling conditions: the periphery is not drilled with the same fault block or adjacent fault blocks.
The potential sand body in the factor (2) takes an oil source fault as a boundary necessary condition, and in the other factors (1), (3), (4) and (5), favorable zones, high-structure parts, oil and gas reservoirs at the periphery and drilled wells at the periphery meet 2 items, so that the potential sand body can be defined as a potential reserve unit.
Preferably, the reserve calculation parameters in the step d include the oil-containing area, thickness, porosity, oil saturation and volume coefficient of the potential sand body.
Preferably, the step d includes the following steps:
d1, calculating the gross volume V of the potential sand body by using the top and bottom interfaces in the step b2 through a construction method;
d2, calculating an effective volume, namely the product of the oil-containing area and the effective thickness by using the product of the oil field reservoir fullness (the ratio of the oil column to the gas column to the trap height) R and the gross volume V in the step d 1;
d3, calculating the potential resource quantity N by using the calculation parameters of the adjacent implemented oil reservoirs, wherein the specific formula is as follows:
N＝0.01VRφS oi ρ oa /B oi (1)
wherein N is potential resource amount with unit of 10 4 t; v is the gross volume of the potential sand body and the unit is km 3 (ii) a R is the oil field oil deposit fullness, and the unit is percent; phi is the effective porosity in%; s oi Is the oil saturation, unit is%; rho oa Is the ground density of crude oil, and has a unit of g/cm 3 ；B oi Is a volume factor.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the method comprises the steps of dividing medium-term cycle of a reservoir, analyzing a development rule of the reservoir, delineating a longitudinal region of potential sand body development by taking a high-resolution sequence stratigraphic theory as a guide, searching a plurality of peripheral potential sand bodies by using slice deduction, carrying out multi-factor analysis on each potential sand body, simultaneously meeting any two items of favorable zones, high-structure parts, oil and gas reservoirs at the periphery and well drilling at the periphery under the condition of meeting the condition of approaching an oil source fault, evaluating the potential sand bodies as potential reserve units, and finally carrying out quantitative resource quantity evaluation on the potential reserve units;
2. on the basis of fully analyzing the understanding of the reservoir development rule, the invention forms a set of multi-factor analysis method for evaluating sand potential, and establishes a judgment standard for determining whether potential sand bodies around the offshore developed oil field have potential;
3. the invention provides a quantitative evaluation method for the amount of potential resources around a developed oil field, which promotes the qualitative prediction of peripheral potential sand bodies to quantitative evaluation and provides quantitative indexes for oil gas potential excavation.
Drawings
FIG. 1 is a schematic flow diagram of the quantitative evaluation method of the present invention;
FIG. 2 is a graph illustrating the mid cycle division of a reservoir in a ballast group according to an embodiment of the present invention;
FIG. 3 illustrates a seismic reflection interface corresponding to the comparison of the mid-cycle division of the ballast set in accordance with an embodiment of the present invention;
FIG. 4 is a graph of sand volume search for the potential of the brightening ballast group III-1 in accordance with one embodiment of the present invention (the bottom graph is the minimum amplitude attribute graph);
FIG. 5 is a plot of hydrocarbon zone division versus source fault distribution for an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer and more complete, the technical solutions of the present invention are described below clearly, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1-5, the present embodiment further describes a peripheral potential sand body 1 in the same period as the sand body in the bohai BZ oil field a in eastern part of china as an example.
As shown in figures 2 and 4, the lower section of the brightening ballast of the BZ oil field is a shallow water deltaic facies sedimentary stratum, the oil grade is equivalent to a medium-term gyric scale, wherein sand body A (namely, a fallen oil deposit A) is positioned in a main body area of the oil field, potential sand body 1 is positioned at the periphery of the oil field, potential sand body 1 is III oil top synchronous sand body, and the invention adopts the following technical scheme to quantitatively evaluate the quantity of potential resources at the periphery of the developed BZ oil field.
and a, analyzing the development rule of the reservoir around the developed oil field based on the high-resolution sequence stratigraphic evolution rule, and locking the development position of the favorable reservoir.
In the step a, the favorable reservoir development position is an advantageous reservoir development position based on analysis of a high-resolution sequence stratigraphic evolution rule (based on the high-resolution sequence stratigraphic evolution rule, the conventional well logging curve and the conventional high seismic response surface comprehensive division of the revolution of the stratum), the medium-term revolution of the reservoir is divided, and the favorable reservoir development position is a conversion area of the medium-term revolution reference surface from water recession to water-in conversion.
Through high-resolution sequence stratigraphic recognition, three half-middle gyrations develop in the II-V oil groups of the Minghua Zhen groups, the conversion regions positioned on the reference plane of the middle gyrations, namely the middle upper part of the V oil group, the top of the III oil group and the middle lower part of the II oil group, develop relatively, and the middle reservoir of the III oil group at the maximum lake flooding period does not develop.
b, searching a seismic reflection interface corresponding to the medium-term gyrating datum plane adjacent to the development position depth of the favorable reservoir, performing horizon interpretation, then extracting seismic attributes, analyzing the development position of the favorable reservoir in the period, searching potential sand bodies and numbering the potential sand bodies.
The step b comprises the following specific steps:
b1, performing horizon interpretation on a seismic reflection interface corresponding to the medium-period convolution datum plane, and using the horizon interpretation as a reference horizon for subsequent potential sand body analysis; as shown in fig. 3, which is a corresponding seismic reflection interface interpreted from the mid-cycle reference plane divided according to step a;
and b2, selecting a corresponding reference horizon as a top interface according to the depth of the favorable reservoir development position, and drifting the top interface for a certain time window length according to the reservoir development thickness to be used as a bottom interface of the potential sand body development period.
The development position of a reservoir at the top of the III oil group and the middle lower part of the II oil group is taken as a target, an adjacent earthquake reference layer is taken as a III oil group top interface, and the reference layer drifts downwards for 30ms as a bottom interface of the development of the sand body in the period according to the well drilling thickness range of the developed sand body in the period which is drilled with the depth of 8-25 m.
b3, extracting amplitude seismic attributes from the seismic data between the top interface and the bottom interface in the step b2, judging the development position of the favorable reservoir stratum in the deposition period according to the plane distribution of the amplitude seismic attributes, and numbering potential sand bodies.
And (c) extracting amplitude seismic attributes by using the top and bottom interfaces determined in the step b as a time window range, and using the amplitude seismic attributes to represent the plane development condition of the potential sand bodies in the period, as shown in fig. 4. III, the top of the oil group + II, the middle and lower reservoir slices of the oil group are deduced to find 7 potential sand bodies in the same period.
And c, carrying out multi-factor analysis including oil-gas-containing zones, oil source faults, construction positions, the situation of the peripheral trapped oil and gas reservoirs or the situation of peripheral drilling aiming at the potential sand bodies, evaluating each potential sand body, and determining potential reserve units.
As shown in fig. 5, in the step c, the following multi-factor analysis is performed on each potential sand body searched out in the step b:
(1) Oil-gas-containing zone: according to the recognition of the regional accumulation rule, the method is divided into a favorable zone and a non-favorable zone, wherein the favorable zone needs to simultaneously meet two conditions of being close to an oil source fault and being positioned on a fault rising tray. In a BZ oil field, a fracture system develops, a research area has a plurality of fault blocks which are controlled by a deep large fault and are divided into a descending disc and an ascending disc, and potential sand bodies 1 are positioned on the ascending disc and belong to favorable zones.
(2) Oil source fault: an oil source fault and a non-oil source fault, wherein the oil source fault is a fault that communicates the reservoir with the hydrocarbon source rock. The oil source fault control construction pattern, but not the oil source fault, is late in forming time and small in scale, a reservoir and a hydrocarbon source rock cannot be effectively connected, and a potential sand body 1 develops near the oil source fault.
(3) Constructing a position: a high construction part and a low construction part, wherein the high construction part is positioned on the lifting disc, the potential sand body 1 is positioned on the lifting disc and grows at the high construction part.
(4) The situation of the peripheral trapped reservoir: drilling the same or adjacent blocks to meet the oil and gas reservoir in the same period and not to drill the oil and gas reservoir; the potential sand body 1 is a drilling oil-gas reservoir of the synchronous sand body A.
(5) Peripheral drilling conditions: the periphery is not drilled with well and the well drilling of the same fault block or the adjacent fault blocks. Potential sand body 1 periphery bores and meets 3 exploitation wells, all bores and meets the oil reservoir.
Aiming at the potential sand body 1, the condition that the potential sand body in the factor (2) is close to an oil source fault is necessary is met, and in the other factors (1), (3), (4) and (5), 2 items are met in favorable zones, high-structure parts, oil and gas reservoirs at the periphery and drilling at the periphery, so that the potential sand body 1 is considered as a potential reserve unit.
d, determining the reserve calculation parameters of the potential reserve unit, and calculating the reserve of the potential sand body.
The reserve calculation parameters in the step d comprise the oil-containing area, the thickness, the porosity, the oil saturation and the volume coefficient of the potential sand body.
The step d comprises the following specific steps:
d1, calculating the gross volume V of the potential sand body by using the top and bottom interfaces in the step b2 through a construction method; calculating the gross volume V =22.29km by using the sand body drilling OWC (Oil Water Contact, oil-Water boundary) and the top and bottom surfaces of the structure through a structuring method 3 ；
d2, calculating an effective volume, namely the product of the oil-containing area and the effective thickness by using the product of the oil field oil reservoir fullness (the ratio of the oil column to the gas column to the trap height) R and the gross volume V in the step d1, counting that the average fullness of the oil layer of the BZ oil field is 58 percent, 0.58V is the effective volume of the potential sand body 1, and actually calculating the effective volume to be 12.93km 3 ；
d3, calculating the potential resource quantity N by using the calculation parameters of the adjacent implemented oil reservoirs, wherein the specific formula is as follows:
N＝0.01VRφS oi ρ oa /B oi (1)
wherein N is potential resource amount with unit of 10 4 t; v is the gross volume of the potential sand body and the unit is km 3 (ii) a R is the oil field oil deposit fullness, and the unit is; phi is the effective porosity in%; s oi Is oil saturation, unit is%; ρ is a unit of a gradient oa Is the ground density of crude oil, and has a unit of g/cm 3 ；B oi Is a volume factor.
In the embodiment, three development wells are arranged on the periphery and are drilled in oil-meeting layers, and the porosity phi =32% and the oil saturation S of the peripheral developed reserve units are utilized oi =68.1%, volume factor B oi =1.076, crude oil ground density ρ oa ＝0.919g/cm 3 Calculating the potential resource quantity N;
N＝0.0001*22.29km 3 *58％*32％*68.1％*0.919g/cm 3 /1.076＝240.61×10 4 t。
finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A quantitative evaluation method for the amount of potential resources around developed oil fields is characterized by comprising the following steps:
analyzing the development rule of a reservoir around a developed oil field based on a high-resolution sequence stratigraphic evolution rule, and locking the development position of a favorable reservoir;
b, searching a seismic reflection interface corresponding to a mid-term gyrating datum plane adjacent to the development position depth of the favorable reservoir, performing horizon interpretation, then extracting seismic attributes, analyzing the position favorable to reservoir development in the period, searching potential sand bodies and numbering the potential sand bodies;
c, carrying out multi-factor analysis aiming at the potential sand bodies, evaluating each potential sand body, and defining a potential reserve unit;
d, determining a reserve calculation parameter of the potential reserve unit, and calculating the reserve of the potential sand body;
in the step c, performing the following multi-factor analysis on each potential sand body searched in the step b:
(1) Oil-gas-containing zone: according to the recognition of regional accumulation rules, the method is divided into a favorable zone and a non-favorable zone, wherein the favorable zone needs to simultaneously meet two conditions of being close to an oil source fault and being positioned on a fault rising plate;
(2) Oil source fault: an oil source fault and a non-oil source fault, wherein the oil source fault is a fault communicating a reservoir with a hydrocarbon source rock;
(3) And (3) constructing positions: a construction high part and a construction low part, wherein the construction high part is positioned on the ascending disc;
(4) The peripheral well-filled reservoir condition: drilling the same or adjacent blocks to meet the oil and gas reservoir at the same period and not drilling the oil and gas reservoir;
(5) Peripheral drilling conditions: no drilling and drilling with the same or adjacent fault blocks at the periphery;
aiming at each potential sand body, the condition that the potential sand body in the factor (2) is close to an oil source fault is necessary is met, and in the other factors (1), (3), (4) and (5), the favorable zone, the high-structure part, the oil and gas reservoir at the periphery and the drilling well at the periphery meet 2 items, so that the potential sand body is considered as a potential reserve unit.
2. The quantitative evaluation method of claim 1, wherein in the step a, the favorable reservoir development position is a mid-cycle of the reservoir based on analysis of high-resolution sequence stratigraphic evolution rules, and a transition region of a mid-cycle datum plane from water receding to water entering transition is the favorable reservoir development position.
3. The quantitative evaluation method according to claim 2, wherein the step b comprises the following specific steps:
b1, performing horizon interpretation on a seismic reflection interface corresponding to the middle-period cycle datum plane, and using the horizon interpretation as a reference horizon for potential sand body analysis;
b2, selecting a corresponding reference horizon as a top interface according to the depth of the favorable reservoir development position, and drifting the top interface for a certain time window length according to the reservoir development thickness to be used as a bottom interface of the potential sand body development period;
b3, extracting amplitude seismic attributes from the seismic data between the top interface and the bottom interface in the step b2, judging the development position of the favorable reservoir stratum in the deposition period according to the plane distribution of the amplitude seismic attributes, and numbering the potential sand bodies.
4. The quantitative evaluation method of claim 3, wherein the reserve calculation parameters in the step d comprise the oil-bearing area, the thickness, the porosity, the oil saturation and the volume coefficient of the potential sand body.
5. The quantitative evaluation method according to claim 4, wherein the step d comprises the following specific steps:
d1, calculating the gross volume V of the potential sand body by using the top and bottom interfaces in the step b2 through a construction method;
d2, calculating the effective volume by using the product of the oil field oil deposit fullness R and the gross volume V in the step d 1;
d3, calculating the potential resource quantity N by using the calculation parameters of the adjacent implemented oil reservoirs, wherein the specific formula is as follows:
N＝0.01VRφS oi ρ oa /B oi (1)
wherein N is the potential resource amount, V is the gross volume of the potential sand body, R is the oil field oil deposit fullness, phi is the effective porosity, and S is oi Is the oil saturation, p oa As crude oil surface density, B oi Is a volume factor.
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