CN104111483B - A kind of exploitation method of fault depressed lacustrine basin slope belt oil pool distribution - Google Patents
A kind of exploitation method of fault depressed lacustrine basin slope belt oil pool distribution Download PDFInfo
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Abstract
The present invention relates to a kind of exploitation method of fault depressed lacustrine basin slope belt oil pool distribution, belong to oil exploration technology field.The present invention explores the later stage for fault depressed lacustrine basin, by counting hydrocarbon source rock in target area, fluid potential, Sedimentary Facies and the relevant information of tomography, mutually leads principle, comprehensive analysis above- mentioned information according to source potential so that it is determined that oil pool distribution area favourable in target area.The present invention has broken the exploration limitation of positive oil-control, is shifted to negative structure and positive structure flank, carries out comprehensive analysis according to fault parameter in oil sources, fluid potential, sedimentary facies distribution and area, slope belt is evaluated, chooses favourable exploration target area.
Description
Technical field
The present invention relates to a kind of exploitation method of fault depressed lacustrine basin slope belt oil pool distribution, belong to oil exploration technology field.
Background technology
In face of the crude oil production situation that my oil field is increasingly serious, and the complicated Oil ＆ Gas Reservoir Formation Conditions of depression, carry out in a deep going way
The research method for evaluating fault depressed lacustrine basin slope belt Favorable Areas is to realize the key that the exploration of NANYANG DEPRESSION next step breaks through.At present, state
It is inside and outside that many researchs there has also been to the complicated fault depressed lacustrine basin of terrestrial facies.NANYANG DEPRESSION belongs to the complicated fault depressed lacustrine basin of terrestrial facies, and construction is complicated, tomography
Development, material resource are enriched, and pass through the exploration of decades, it was found that a variety of Oil-gas Accumulation Types, except disconnected nose（Fault block）, oil-gas anticlinal deposits
Outside, also develop complicated small-sized disconnected（Nose）Block oil-gas reservoir, the compound oil-gas reservoir of tomography+lithology, lithology, stratigraphic unconformity oil-gas reservoir,
The complicated type oil-gas reservoir such as basement hydrocarbon reservoir, fractured shale reservoirs.In recent years, the collection with high precision seismic data and place
The continuous improvement of reason level, basin analysis, into hydrocarbon reservoiring theory, seismic stratigraphy, the further development of sequence stratigraphy and should
With providing new theoretical foundation and strong technological means for the exploration that carries on NANYANG DEPRESSION oil-gas reservoir.
Early in the 40-50 ages in 20th century, Hubbert just illustrates and expressed underground fluid (oil, gas with the concept of fluid potential
And water) the characteristics of motion, to characterize the fluid ability of fluid.During oil-gas migration, the effective seepage flow and effective displacement of fluid
Ability arranges the remaining displacement pressure (kinetic energy of fluid) and buoyancy of hydrocarbon from hydrocarbon source rock, which constitutes the main dynamic of Hydrocarbon Formation Reservoirs
Power.The basic motive condition of Gas Accumulation is represented with gesture, oil gas condition of acceptance is represented with Xiang Lai, then the process of Hydrocarbon Formation Reservoirs
Just the power representated by gesture constantly overcomes the process of the resistance representated by phase.Oil gas selectively filling Reservoir Body is to be attributed to
" phase "（Reservoir medium attribute）" gesture "（Flow of fluid ability）Coupling between the two, only when fluid potential overcomes storage
During layer displacement pressure, the stratum water in reservoir pore space could could turn into the useful space for receiving oil gas by displacement, hole.
The proposition that " phase-gesture " coupling control is hidden, can preferably recognize the reservoiring mechanism of subtle pool, instruct oil-gas reservoir to survey
Visit, but " phase-gesture " coupling control at present is hidden and also rests on the qualitative description stage mostly.The oil-gas reservoir that NANYANG DEPRESSION has found is generally
Middle-shallow layer breaks nose, fault block and faulted anticline class oil-gas reservoir, and construction is complicated, and controlling factor is more so that " phase-gesture " coupling control hide it is theoretical by
To certain influence.
The content of the invention
It is an object of the invention to provide a kind of exploitation method of fault depressed lacustrine basin slope belt oil pool distribution, to solve fault depressed lacustrine basin
Slope belt oil pool distribution is influenceed to cause selected by existing exploitation method by factors such as boundary fault segmenting feature, sedimentary facies and tomographies
Take the problem of oil pool distribution area favourable in target area is not accurate enough.
The present invention provides a kind of exploitation method of fault depressed lacustrine basin slope belt oil pool distribution to solve above-mentioned technical problem, should
Method comprises the following steps：
1）The range distribution that oil reservoir and hydrocarbon center are had found in resources of play, Statistical Area band is calculated according to hydrocarbon source rock；
2）According to target area formation pressure calculation target zone fluid potential planar distribution feature；
3）According to the interval of target area study of micro-sedimentary phase evaluation of result purpose, with reference to physical property analysis result, calculating mutually refers to
Number feature；
4）Relation according to the occurrence of target area slope belt major faults and its with construction crestal line, to Fault-Sealing coefficient
SGR is counted；
5）According to the dependency relation of the phase index, fluid potential and the oil reservoir that are determined in above-mentioned steps be respectively divided out low phase, in
Phase low phase and low gesture, middle gesture and high gesture, make the plane isopleth of phase index, fluid potential and Fault-Sealing coefficient S GR values
Figure, determines the favourable petroleum play for being substituted by oil gas that phase index is lower, fluid potential value is lower and Fault-Sealing coefficient is higher.
Described step 1）Middle migration distance is shown as to the control action of oil-gas pool distribution：With the increasing of migration distance
Greatly, oil-gas reservoir number first increases is reduced afterwards, is difficult into Tibetan more than certain migration distance oil gas.
, the step 2）In fluid potential calculation formula be：
Фo=gz+P/ρo
Wherein Ф o are the fluid potential of the point, and g is acceleration of gravity, and z is elevation of this relative to reference plane, and data are come
Each layer structural map is come from, P is measuring point pressure, and ρ o are oil density.
Described step 3）In phase formula of index be：
FI=(Φi+Ki)/2；Φi=Φ/Φmax；Ki=lgK/lgKmax
Wherein Φ i are fraction porosity (%)；Φ is rock porosity (%)；Φ max are maximum porosity under equal conditions
(%)；Ki is that (K, 10-3 μm 2) for relative permeability；K is finger rock permeability (10-3 μm 2)；Kmax oozes for maximum under equal conditions
Saturating rate (10-3 μm 2).
The step 4）In Fault-Sealing coefficient S GR be used for characterize dredging for the tomography that target area is connected with hydrocarbon center
Property and its conformability with advantage sand body, Fault-Sealing coefficient S GR is also referred to as tomography mud stone mass fraction, and its value is bigger, and reflection is disconnected
The seal-off effect of layer is better, and its calculation formula is：
SGR=∑（V×△Z）/D×100%
Wherein V represents each rock stratum shale content in fault throw, and △ Z represent the thickness of each rock stratum, and D represents turn-off.
The beneficial effects of the invention are as follows:The present invention for fault depressed lacustrine basin explore the later stage, by count hydrocarbon source rock in target area,
The relevant information of fluid potential, Sedimentary Facies and tomography, mutually leads principle, comprehensive analysis above- mentioned information is so that it is determined that target according to source potential
Favourable oil pool distribution area in area.The present invention has broken the exploration limitation of positive oil-control, to negative structure and positive structure flank
Transfer, carries out comprehensive analysis according to fault parameter in oil sources, fluid potential, sedimentary facies distribution and area, slope belt is evaluated,
Choose favourable exploration target area.
Brief description of the drawings
Fig. 1 is oil pool distribution schematic diagram in the embodiment of the present invention；
Fig. 2 is different migration distance oil-gas pool distribution feature schematic diagrames；
Fig. 3 is oil reservoir phase index and fluid potential relation schematic diagram；
Fig. 4 is that reservoir fluid gesture, phase index and tomography SGR value plane isopleths cross figure in the embodiment of the present invention.
Embodiment
The embodiment to the present invention is further described below in conjunction with the accompanying drawings.
The exploitation method of the fault depressed lacustrine basin slope belt oil pool distribution of the present invention mutually leads principle according to source potential, breaks positive oil-control
Exploration limitation, shifted to negative structure and positive structure flank, to solve in the Filling process being recessed at present, be controlled by border
The segmenting feature of fracture, source rock development has its unique one side, and oil reservoir source control feature is obvious, meanwhile, sedimentary facies, tomography
Also the distribution of oil reservoir is significantly controlled, the problem of oil reservoir is by many factors Comprehensive Control specifically includes following steps：
1. the range distribution that oil reservoir and hydrocarbon center are had found in resources of play, Statistical Area band is calculated according to hydrocarbon source rock,
With the distance of target area and hydrocarbon center（L）Characterized with maximum row's hydrocarbon intensity (M), it has been found that oil reservoir and the distance at hydrocarbon center
Refer to each oil reservoir distal border in hydrocarbon maximum intensity region distance, by statistics, can reflect the zone for hydrocarbon source power and
The ability of transporting Oil/gas Traps in area, is the basis that look for oil and gas is hidden, and migration distance is showed the control action of oil-gas pool distribution
For：With the increase of migration distance, oil-gas reservoir number first increases to be reduced afterwards, is difficult into Tibetan more than certain migration distance oil gas.
Row's hydrocarbon intensity of source rock is bigger, and it is also bigger that it controls the reserves hidden area and controlled.
2. calculate the fluid potential of target area
The mechanical energy that fluid potential refers to the fluid of unit mass and had is integrated, for reacting target area and hydrocarbon central potential
The size of energy difference, the calculation formula of fluid potential is as follows：
Фo=gz+P/ρo
Wherein it is the fluid potential of a certain measuring point（J/kg）, g is acceleration of gravity（Here value is 9.8）, z is the measuring point phase
For reference plane（Elevation is 0m）Elevation（m）, data source is in each layer structural map, and P is measuring point pressure（pa）, ρ0It is former for stratum
Oil density（kg/m3）, P here is corresponding to the stratum hydrostatic pressure of measuring point, P=Z ρwG, ρwFor stratum water density.
3. determining the size for the physical properties of rock that target area is determined by sedimentary facies, represented with phase index FI, phase index
Calculation formula is：
FI=(Φi+Ki)/2；
Wherein Φ i=Φ/Φ max, Ki=lgK/lgKmax, Φ i is fraction porosity（%）, Φ is rock porosity（%）,
Φ max are maximum porosity under equal conditions（%）, Ki is relative permeability, and K has been rock permeability, and Kmax is equal conditions
Lower maximum permeability.
Illustrate the phase of oil reservoir by taking NANYANG DEPRESSION as an example below（Phase index）With gesture（Fluid potential）Relation, by Nanyang
Sunk part formation testing achievement and oil-gas Layer physical parameter（Porosity, permeability）Data is counted, actual with reference to NANYANG DEPRESSION
Exploration situation, makes fluid potential energy and phase exponential distribution figure, as shown in figure 3, fluid potential is divided into high gesture（Фo>45）, middle gesture
（30<Фo<40）With low gesture（Фo<30）, phase index is divided into excellent phase（FI>0.6）, middle phase（0.4<FI<0.6）And low phase
（FI<0.4）, slave phase power-relation remittance it can be seen from the figure that, fluid potential is in obvious negative correlativing relation with phase index, and potential energy is high, mutually refers to
Number lower limit is low, and potential energy is low, limit for height under phase index.The high strong phase of gesture, the weak phase of high gesture and low gesture are strong mutually can be into Tibetan.
4. the occurrence pair significant tomography（Mainly co-hade）, seal-off effect parameter（SGR parameters）Counted, blocked
Property is better, and the bigger zone of co-hade is more beneficial for into Tibetan.
With the angle between Fault-Sealing coefficient S GR and tomography and potential energy the segmentation line of rabbet joint（A）To characterize target area and hydrocarbon
The dredging property of the tomography of center UNICOM and its conformability with advantage sand body, Fault-Sealing coefficient tomography mud stone ratio SGR
(Shale Gouge Ratio) is represented, also referred to as tomography mud stone mass fraction, is that Yeiling was proposed in 1997, it calculates knot
Fruit is bigger, reflects that the seal-off effect of tomography is better, its calculation formula is：
SGR=∑（V×△Z）/D×100%
V represents each rock stratum shale content in fault throw, and Z represents the thickness of each rock stratum, and D represents turn-off.
5. the relevant information of the hydrocarbon source rock, fluid potential, Sedimentary Facies and tomography obtained by summary step, in plan
On make the plane equivalence of phase index, fluid potential and tomography SGR values, phase index is lower, and flow valuve gesture value is lower while disconnected
The higher zone of layer clog cofficient is the favourable petroleum play of oil gas.
Embodiment
The oil field selected in the present embodiment based on monoclinal structure, as shown in figure 1, and have 10km apart from oil generation source, and
Based on the type traps such as disconnected nose, fault block and tomography-lithology, fracture is complicated, mature fault and small, development length
Short, meet relation is complicated, Complex Fault Block Oil Reservoir so that fault block area is small, oil columns are small, oil-containing band is narrow, it is vertical on " toothbrush
Formula " oil reservoir is principal character, and Complex Fault Block Oil Reservoir exploration success ratio is not high.With the thinking of " source potential is mutually led ", to oil field oil
The controlling factors such as source, sedimentary facies, tomography carry out overall merit, and its detailed process is as follows：
（1）Source is to oil reservoir control action
By counting oil reservoir apart from the distance at hydrocarbon center as can be seen that oil reservoir focuses mostly within 8km, typically 10~
15km, does not have oil-gas pool distribution more than 30km, therefore, and lateral migration distance is conducive to the shape of depression oil-gas reservoir in 0~15km
Into as shown in Figure 2.
（2）Phase gesture is to oil reservoir control action
Phase index is calculated based on oil reservoir actual measurement porosity and permeability value；Calculated based on Measured formation pressure reservoir buried depth
Go out strata pressure, and then calculate flow valuve gesture value.Dependency relation based on phase index, fluid potential and oil reservoir mark off low phase, in
Phase, high phase and low gesture, middle gesture and high gesture, wherein phase region is relatively favourable zone in low gesture low phase, middle gesture.
Phase index and flow valuve gesture data are returned, fluid potential can be drawn（Displacement pressure）With phase index (under physical property
Limit) regression curve, its relational expression is as follows：
Y=358.9x-1.03
In formula：Y- fluid potentials, kj/kg；X- phase indexes.
As shown in figure 3, be oil-gas bearing area under curve, fluid potential and phase exponential number meet at the region it is easy into
Hide；It is not oil-gas bearing area on curve, what fluid potential and phase index met at the region can not be into Tibetan；Before being bored accordingly
Petroleum-gas prediction.
3. making the isogram of phase index, fluid potential and Fault-Sealing coefficient S GR values respectively, cross in the plane, such as
Shown in Fig. 4, it is seen that it is 20~30kj/kg, phase index more greatly 0.6~0.8, tomography that in northeast, zone flow valuve gesture value is smaller
SGR values are 30~40, are favourable oil-gas accumulation zones, and west and south zone flow valuve gesture value is higher, is 50kj/kg, and phase index is
0.5, it is high gesture low phase belt, the fortune for being unfavorable for oil gas is gathered.
Claims (5)
1. a kind of exploitation method of fault depressed lacustrine basin slope belt oil pool distribution, it is characterised in that this method comprises the following steps：
1) range distribution that oil reservoir and hydrocarbon center are had found in resources of play, Statistical Area band is calculated according to hydrocarbon source rock, that is, is transported
Move range distribution；
2) according to target area formation pressure calculation target zone fluid potential planar distribution feature；
3) according to target area study of micro-sedimentary phase evaluation of result target zone, with reference to physical property analysis result, phase index characteristic is calculated；
4) relation according to the occurrence of target area slope belt major faults and its with construction crestal line, enters to Fault-Sealing coefficient S GR
Row statistics；Characterized with the included angle A between Fault-Sealing coefficient S GR and tomography and fluid potential the segmentation line of rabbet joint in target area and hydrocarbon
The dredging property of the tomography of heart connection and its conformability with advantage sand body；
5) drawn respectively according to the dependency relation of the phase index and the dependency relation of oil reservoir, fluid potential and the oil reservoir that are determined in above-mentioned steps
Low phase, middle phase, excellent phase and low gesture, middle gesture and high gesture are separated, phase index, fluid potential and Fault-Sealing coefficient S GR is made
Plane equivalence, determines that the zone that phase index is lower, fluid potential is lower and Fault-Sealing coefficient S GR is higher is the favourable of oil gas
Petroleum play.
2. the exploitation method of fault depressed lacustrine basin slope belt oil pool distribution according to claim 1, it is characterised in that described step
It is rapid 1) in migration distance the control action of oil-gas pool distribution is shown as：With the increase of migration distance, oil-gas reservoir number first increases
Reduced after many, be difficult into Tibetan more than certain migration distance oil gas.
3. the exploitation method of fault depressed lacustrine basin slope belt oil pool distribution according to claim 2, it is characterised in that the step
2) the fluid potential calculation formula in is：
Ф o=gz+P/ ρ0
Wherein Ф o are the fluid potential of the point, and g is acceleration of gravity, and z is elevation of this relative to reference plane, data source in
Each layer structural map, P is measuring point pressure, ρ0For oil density.
4. the exploitation method of fault depressed lacustrine basin slope belt oil pool distribution according to claim 3, it is characterised in that described step
It is rapid 3) in phase formula of index be：
FI=(Φ i+Ki)/2；Φ i=Φ/Φ max；Ki=lgK/lgKmax
Wherein Φ i are fraction porosity, %；Φ is rock porosity, %；Φ max are maximum porosity, % under equal conditions；
Ki is relative permeability, 10-3μm2；K is finger rock permeability, 10-3μm2；Kmax is maximum permeability, 10 under equal conditions-3μ
m2。
5. the exploitation method of fault depressed lacustrine basin slope belt oil pool distribution according to claim 4, it is characterised in that the step
4) split the included angle A between the line of rabbet joint to characterize in target area and hydrocarbon with Fault-Sealing coefficient S GR and tomography and fluid potential in
The dredging property of the tomography of heart connection and its conformability with advantage sand body, Fault-Sealing coefficient S GR are also referred to as tomography mud stone quality point
Number, its value is bigger, reflects that the seal-off effect of tomography is better, its calculation formula is：
SGR=∑s (V × △ Z)/D × 100%
Wherein V represents each rock stratum shale content in fault throw, and △ Z represent the thickness of each rock stratum, and D represents turn-off.
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