CN109323970B - Method for evaluating vertical conductance performance of movable section - Google Patents
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Abstract
The invention discloses an evaluation method for vertical conductance performance of a movable section, which comprises the steps of determining effective activity time of different positions of the section, determining the storage power strength of a source storage of the section and determining the vertical conductance performance of different positions of the section. The invention has the beneficial effects that: the vertical conductivity of oil gas at different positions on the section can be rapidly and effectively determined, the filling difficulty of the oil gas at the position to a reservoir and the possibility of accumulation are determined, important data support is provided for oil gas exploration work in a research area, and the vertical conductivity determination method has great economic benefit and has important geological significance for oil and gas geology, tectonics, oil gas accumulation characteristic analysis and the like.
Description
Technical Field
The invention relates to an evaluation method, in particular to an evaluation method of vertical conductivity of a movable section, belonging to the technical field of exploration and development of petroleum and natural gas geological resources.
Background
Petroleum and natural gas are important strategic resources of the country, and influence many aspects of the country such as politics, economy, safety and the like. The fault is a structural form widely developed in structural movement, connects a lower source rock stratum and an upper reservoir stratum and is an important channel for vertical migration of oil and natural gas. When the movable fault is opened, a cavity distributed along the section can be formed, and oil gas is driven by buoyancy and pressure difference to vertically migrate along the section to a favorable reservoir. Because the efficiency of fault vertical conductance is far greater than that of reservoir lateral migration under the drive of buoyancy, the evaluation of fault conductance performance is always a research hotspot in geologists. In the past, the evaluation of the vertical conductivity of the fault mainly focuses on the communication relationship between source rock stratums on two sides of the fault and reservoir stratums, but in the actual underground situation, the activity characteristics of different parts on the fault surface are different, and the fault surface is often communicated with a plurality of sets of reservoir stratums, so that the evaluation difficulty of the conductivity of the fault surface is greatly increased. Therefore, the method for evaluating the vertical conductivity of the movable section is provided, is used for representing the difficulty of filling oil and gas to a reservoir at different positions on the section, and has important significance for oil and gas exploration and development.
Disclosure of Invention
The invention aims to solve the problems and provide a method for evaluating the vertical conductivity of a movable cross section.
The invention realizes the purpose through the following technical scheme: a method for evaluating the vertical conductance performance of a movable section comprises the following steps:
step A, determining effective activity time of different positions of the section, selecting different positions of the section, calculating the breakpoint distance of two reservoir layers of the section, and dividing the breakpoint distance by the reservoir layer thickness to obtain the effective activity time of the section to the reservoir layer set:
Tstore up＝(hStore up-hStore')/HStore up；
In the formula, hStore up、hStore'The breakpoint depths of the ascending disc and the descending disc of the set of reservoir are respectively m; hStore upIs the thickness of the set of reservoirs in m;
and step B, determining the inter-source reservoir formation power strength of the section, and representing the inter-source reservoir formation power strength according to the ratio of the difference between the source rock stratum and the reservoir stratum static pressure to the difference between the hydrostatic pressures:
fpressure difference＝(PSource-PStore up)/(ρWater (W)ghSource-ρWater (W)ghStore up)
Wherein, PSource、PStore upStatic pressure of source rock formation and reservoir formation respectivelyIn MPa; rhoWater (W)Is the density of water, and has a unit of 1.0g/cm3(ii) a g is the acceleration of gravity, and the unit is 9.8m/s2(ii) a h source, hStore upThe unit is m, which is the buried depth of the source rock stratum and the reservoir stratum;
and step C, determining the vertical conductivity of the section at different positions, and calculating the vertical conductivity S of the section to the reservoir according to the butt joint of the section at different positions and the reservoir:
S＝Tstore up×fPressure difference＝(hStore up-hStore')/HStore up×(PSource-PStore up)/(ρWater (W)ghSource-ρWater (W)ghStore a)；
And D, judging the vertical conductivity of the section to the set of reservoir according to the S value obtained by the calculation of the step.
Preferably, in order to ensure that the distance for disconnecting the reservoir is longer and further the effective activity time of the set of reservoir is longer, in the step a, the selected section position is cut through the horizon.
Preferably, in order to evaluate the vertical conductivity of the fracture surface, in the step B, the source rock layer is in fault communication with the reservoir, the reservoir formation pressure is usually hydrostatic pressure, and the source rock layer is abnormally high in pressure.
Preferably, in the step C, in order to obtain the oil and gas vertical conductivity data at different positions on the cross section, three positions of the cross section in the reservoir are selected, and the vertical conductivity S is calculated.
Preferably, in order to quickly and effectively determine the vertical conductivity of oil and gas at different positions on the section, in the step D, the calculated vertical conductivity S value is in a direct linear relationship with the vertical conductivity of the reservoir.
The invention has the beneficial effects that: the evaluation method of the vertical conductivity of the movable section has reasonable design, in the step A, the selected section position cuts through the layer to ensure that the distance of the disconnected reservoir is larger, and further the effective activity time of the set of reservoir is longer, in the step B, the source rock stratum is communicated with the reservoir through the fault, the reservoir stratum pressure is usually hydrostatic pressure, the source rock stratum has multiple abnormal high pressure, the pressure difference between the two sets of layers is the important power for the vertical migration of oil and gas through the fault, therefore, the vertical conductivity of the section is convenient to evaluate through calculation, in the step C, the sections are respectively positioned at three positions of the reservoir, the vertical conductivity S is respectively calculated to obtain the vertical conductivity data of the oil and gas at different positions on the section, and further, the evaluation is convenient, in the step D, the calculated vertical conductivity S of the oil and gas is in a proportional linear relationship with the vertical conductivity of the reservoir, the vertical oil and gas transmission and conduction performance of different positions on the section can be rapidly and effectively determined, and the filling difficulty of the oil and gas at the position to the reservoir and the possibility of accumulation and accumulation are determined.
Drawings
FIG. 1 is a cross-sectional effective activity time determination diagram of the present invention;
FIG. 2 is a plot of the determination of the inter-source storage power intensity of the cross section of the present invention;
FIG. 3 is a table comparing vertical conductivity of a cross section according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, a method for evaluating vertical conductance of a movable cross section includes the following steps:
step A, determining effective activity time of a fracture surface, selecting geological profiles at two positions of an east section and a west section of the fracture surface, respectively calculating breakpoint distances and stratum thicknesses of two sets of reservoirs of a reservoir a and a reservoir b of the fracture surface, and determining the effective activity time of the fracture surface;
the calculation results are as follows:
east segment:
Tdongdong section·Reservoir a＝(hDongdong section·Reservoir a-hDongdong section·Reservoir a’)/HDongdong section·Reservoir a
＝(3073-3037)/(3095-3037)＝0.62
TDongdong section·Reservoir b＝(hDongdong section·Reservoir b-hDongdong section·Reservoir b’)/HDongdong section·Reservoir b
＝(3210-3176)/(3233-3176)＝0.60
In the west segment:
Twestern-style segment·Reservoir a＝(hWestern-style segment·Reservoir a-hWestern-style segment·Reservoir a’)/HWestern-style segment·Reservoir a
＝(3098-3083)/(3130-3083)＝0.32
TWestern-style segment·Reservoir b＝(hWestern-style segment·Reservoir b-hWestern-style segment·Reservoir b’)/HWestern-style segment·Reservoir b
＝(3234-3212)/(3280-3212)＝0.32
Step B, determining the source reservoir forming power strength of the section, calculating the static pressure difference between the middle part of the source rock stratum c and the middle parts of the reservoir stratum B and the reservoir stratum a, and representing the source reservoir forming power strength by the ratio of the static pressure difference to the static pressure difference;
wherein the source rock c is abnormally high in pressure, the static pressure is 45.8MPa, and the reservoir section is at normal pressure which is equal to the hydrostatic pressure;
east segment:
fdongdong section·Reservoir a＝(PSource rock c-ρWater (W)ghDongdong section·Reservoir a)/(ρWater (W)ghSource rock c-ρWater (W)ghDongdong section·Reservoir a)
＝(45.8-30.0)/(33.1-30.0)＝5.1
fDongdong section·Reservoir b＝(PSource rock c-ρWater (W)ghDongdong section·Reservoir b)/(ρWater (W)ghSource rock c-ρWater (W)ghDongdong section·Reservoir b)
＝(45.8-31.4)/(33.1-31.4)＝5.3
In the west segment:
fwestern-style segment·Reservoir a＝(PSource rock c-ρWater (W)ghWestern-style segment·Reservoir a)/(ρWater (W)ghSource rock c-ρWater (W)ghWestern-style segment·Reservoir a)
＝(45.8-30.4)/(33.1-30.4)＝5.7
fWestern-style segment·Reservoir b＝(PSource rock c-ρWater (W)ghWestern-style segment·Reservoir b)/(ρWater (W)ghSource rock c-ρWater (W)ghWestern-style segment·Reservoir b)
＝(45.8-31.9)/(33.1-31.9)＝11.6
Step C, determining vertical conductivity of different positions of the fracture surface, and combining the effective activity time of the fracture surface and the calculation result of the dynamic strength of the reservoir between the source reservoirs to obtain vertical conductivity S of oil and gas from two sets of reservoirs of an east reservoir and a west reservoir of the hydrocarbon source rock C to the fracture surface and a reservoir a;
the calculation process is as follows:
east segment:
Sdongdong section·Reservoir a＝TDongdong section·Reservoir a×fDongdong section·Reservoir a＝0.62×5.1＝3.16
SDongdong section·Reservoir b＝TDongdong section·Reservoir b×fDongdong section·Reservoir b＝0.60×5.3＝3.18
In the west segment:
Swestern-style segment·Reservoir a＝TWestern-style segment·Reservoir a×f west segment·Reservoir a＝0.32×5.7＝1.82
SWestern-style segment·Reservoir b＝TWestern-style segment·Reservoir b×f west segment·Reservoir b＝0.32×11.6＝3.71
And D, calculating the S value obtained through the steps, wherein the difference between the east and west vertical conductance performance of the fault is obvious, the difficulty of filling oil gas into the west reservoir b of the fault after the oil gas is discharged from the source rock c is the smallest, the possibility of accumulating the oil gas into the reservoir is the largest, the filling difficulty difference between the east reservoir a and the reservoir b is not large, and the difficulty of filling the oil gas into the west reservoir a is the largest.
In the step A, the selected position of the cross section cuts through the layer, the distance for disconnecting the reservoir is ensured to be larger, and further the effective activity time of the set of reservoir is longer, in the step B, the source rock stratum is communicated with the reservoir through the fault, the reservoir stratum pressure is usually hydrostatic pressure, multiple abnormal high pressures occur on the source rock stratum, the pressure difference between the two sets of layers is important power for vertical migration of oil gas through the fault, so the vertical conductivity of the cross section can be evaluated conveniently through calculation, in the step C, the cross section is respectively positioned at three positions of the reservoir, the vertical conductivity S is respectively calculated, oil gas vertical conductivity performance data at different positions on the cross section are obtained, further the evaluation is convenient, in the step D, the calculated value of the oil gas vertical conductivity S is in a proportional linear relation with the vertical conductivity of the reservoir, and the vertical conductivity of oil gas at different positions on the cross section can be rapidly and effectively determined, and (3) determining the difficulty of filling the oil and gas into the reservoir and the possibility of accumulation at the position.
The working principle is as follows: when the evaluation method of the vertical conductivity of the movable section is used, the vertical conductivity of the section can be obtained through calculation and is used for quantitatively judging the difficulty of oil gas filling of reservoirs at different positions of the section and the possibility of accumulation, the higher the conductivity is, the smaller the difficulty of oil gas filling of the reservoirs is, and the higher the possibility of accumulation is.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A method for evaluating the vertical conductance performance of a movable section is characterized by comprising the following steps: the method comprises the following steps:
step A, determining effective activity time of different positions of the section, selecting different positions of the section, calculating the breakpoint distance of two reservoir layers of the section, and dividing the breakpoint distance by the reservoir layer thickness to obtain the effective activity time of the section to the reservoir layer set:
Tstore up＝(hStore up-hStore')/HStore up；
In the formula, hStore up、hStore'The breakpoint depths of the ascending disc and the descending disc of the set of reservoir are respectively m; hStore upIs the thickness of the set of reservoirs in m;
and step B, determining the inter-source reservoir formation power strength of the section, and representing the inter-source reservoir formation power strength according to the ratio of the difference between the source rock stratum and the reservoir stratum static pressure to the difference between the hydrostatic pressures:
fpressure difference＝(PSource-PStore up)/(ρWater (W)ghSource-ρWater (W)ghStore up)
Wherein, PSource、PStore upRespectively the static pressure of a source rock stratum and a reservoir stratum, and the unit is MPa; rhoWater (W)Is the density of water, and has a unit of 1.0g/cm3(ii) a g is the acceleration of gravity, and the unit is 9.8m/s2；hSource、hStore upThe unit is m, which is the buried depth of the source rock stratum and the reservoir stratum;
and step C, determining the vertical conductivity of the section at different positions, and calculating the vertical conductivity S of the section to the reservoir according to the butt joint of the section at different positions and the reservoir:
S＝Tstore up×fPressure difference＝(hStore up-hStore')/HStore up×(PSource-PStore up)/(ρWater (W)ghSource-ρWater (W)ghStore up)；
And D, judging the vertical conductivity of the section to the set of reservoir according to the S value obtained by the calculation of the step.
2. The method for evaluating the vertical conductance of a movable section according to claim 1, wherein: and in the step A, the selected section position cuts through the layer position.
3. The method for evaluating the vertical conductance of a movable section according to claim 1, wherein: in the step B, the source rock stratum is communicated with the reservoir stratum through a fault, the formation pressure of the reservoir stratum is usually hydrostatic pressure, and the source rock stratum is frequently raised to be abnormally high pressure.
4. The method for evaluating the vertical conductance of a movable section according to claim 1, wherein: and in the step C, selecting three positions of the cross section of the reservoir respectively, and calculating the vertical conductivity S respectively.
5. The method for evaluating the vertical conductance of a movable section according to claim 1, wherein: and D, the calculated vertical conductivity S value is in a direct linear relation with the vertical conductivity of the reservoir.
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