CN101980053A - Complicated reef flat reservoir predicting method - Google Patents
Complicated reef flat reservoir predicting method Download PDFInfo
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- CN101980053A CN101980053A CN201010510261XA CN201010510261A CN101980053A CN 101980053 A CN101980053 A CN 101980053A CN 201010510261X A CN201010510261X A CN 201010510261XA CN 201010510261 A CN201010510261 A CN 201010510261A CN 101980053 A CN101980053 A CN 101980053A
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Abstract
The invention relates to a complicated reef flat reservoir predicting method, and belongs to the technical field of oil exploration. An seismic facies and a sedimentary facies are taken as restraints, interwell interpolation and horizontal fit extrapolation are performed under the control of a sedimentary facies modified line, a blocky initial impedance model according with the geological characteristics of a reef flat reservoir is constructed, spacial structures and physical properties of underground formations are solved through logging-restrained seismic inversion, the secondary interpretation of the reservoir is further carried out under the restraint of the seismic facies and the sedimentary facies, and the spatial distribution characteristics of the reef flat reservoir are finely described; therefore, the quantitative prediction accuracy of the reservoir is obviously improved, the calculating accuracy of the reservoir is higher, the calculating results are more reliable, and the economic benefit of exploring super-deep complicated reef flat reservoir is greatly improved.
Description
Technical field:
The invention belongs to petroleum exploration field, relate to a kind of complicated reef beach method for predicting reservoir.
Background technology:
Developed multiple method for predicting reservoir at present both at home and abroad, as seismic facies analysis, seismic inversion, seismic attributes analysis etc.Wherein, seismic inversion is a most widely used exploration engineering in the reservoir description.A kind of method of sedimentary facies control prediction sandstone oil reservoir attribute that has been 200510090128.2 patent disclosure as application number, realized the phased prediction of physical parameter such as the thickness, factor of porosity, permeability of reservoir sandstone, initial oil saturation and oil-water relative permeability etc., it is phased prediction at clastic reservoir rock, but, perfect inadequately at the complicated reef of deep layer beach Reservoir Prediction technology, the identification of reservoir and quantitative forecast precision are lower, mainly have following several problem:
(1) at present in the main flow seismic inversion technology of usefulness all based on horizontal layer uniform dielectric theory, be difficult to satisfy reef beach reservoir spatial shape complexity, the geological condition of horizontal fast-changing block stratum body, the geologic model of being set up can't accurately reflect real geologic body spread feature;
(2), often adopt the mode of virtual well interpolation to control the border of reservoir in the less exploration newly developed area of drilling data.Because the space spread complex shape of reef beach reservoir is changeable, can't accurately determine the position and the quantity of virtual well, adopt the mode of virtual well interpolation can't accurately and subtly portray the reservoir border, be difficult to satisfy the requirement of prospect pit deployment and calculation of reserves;
(3) reef beach reservoir thickness is big, and reservoir internal wave resistance difference is less, adopts conventional wave impedance inversion method quantitative forecast precision lower.
Summary of the invention:
The objective of the invention is defectives such as the inverting initial model that exists at above-mentioned existing reef beach reservoir prediction technique is inaccurate, unintelligible and reservoir thickness and factor of porosity quantitative forecast precision be not enough to the border portrayal of reservoir, propose a kind of complicated reef beach method for predicting reservoir that improves the reservoir prediction precision.
For achieving the above object, the present invention is by the following technical solutions:
Step of the present invention is as follows:
1. zone of interest sedimentary facies spread is determined in meticulous depiction sedimentary facies modified line;
2. make up the primary wave impedance model that meets reef beach geologic characteristics, carry out phased well logging constraint inverting, obtain conventional Acoustic Impedance Data body;
3. the secondary modeling makes up meticulousr phased initial model, carries out phased wave impedance inversion of secondary and gamma inverting, obtains reflecting the Acoustic Impedance Data body of pure reservoir;
4. extract low wave impedance and come to determine the distribution range of favourable reservoir unusually;
5. carry out the reservoir parameter inverting, the factor of porosity of quantitative forecast reservoir and thickness are finished the fine description of reservoir.
Wherein, zone of interest sedimentary facies spread is determined in the modified line of meticulous depiction sedimentary facies, may further comprise the steps:
(1) carries out well and shake meticulous demarcation, set up rational geologic model and carry out earthquake and just drilling research, determine the seismic reservoir response characteristic, set up the seismic recognition pattern of reservoir and the seismic facies recognition mode of different sedimentary facies belts;
(2) seismic phase recognition mode in base area is carried out seismic phase analysis accurately, and the planar distribution feature of seismic phase changes into sedimentary facies in conjunction with drilling geology research with seismic facies definitely, accurately portrays the sedimentary facies modified line, determines zone of interest sedimentary facies spread feature.
Structure meets the primary wave impedance model of reef beach geologic characteristics, carries out phased well logging constraint inverting, obtains conventional Acoustic Impedance Data body, may further comprise the steps:
(1) utilize structure meticulous interpretation layer position and layer data achievement to make up stratum frame model accurately;
(2) be guidance with known geologic rule, with seismic facies and sedimentary facies is constraint, the well that adheres to different sedimentary facies belts separately is carried out well curvature correction and normalized respectively, utilize interpolation and laterally match extrapolation between sediment phase change line traffic control well, make up the phased initial model that meets reef beach geologic characteristics;
(3) utilize this model to carry out well logging constraint inverting, obtain conventional Acoustic Impedance Data body.
The secondary modeling makes up meticulousr phased initial model, carries out phased wave impedance inversion of secondary and gamma inverting, obtains reflecting the Acoustic Impedance Data body of pure reservoir, may further comprise the steps:
(1) on the Acoustic Impedance Data body, carries out the meticulous demarcation of secondary and the reservoir preliminary interpretation of reservoir, determine top, the bottom boundary of reservoir, and then will carry out the phased modeling of secondary in reservoir top, the bottom boundary adding stratum frame model, make up meticulousr primary wave impedance model, carry out secondary well logging constraint wave impedance inversion;
(2) utilize secondary wave impedance inversion data volume to carry out the gamma inverting, set rational gamma threshold value and utilize the gamma body that wave resistance antibody is carried out filtering, remove the muddy limestone interlayer of high gamma, obtain reflecting the Acoustic Impedance Data body of pure reservoir as soft-constraint.
Extract low wave impedance and come to determine the distribution range of favourable reservoir unusually, it is the meticulous explanation of under the constraint of seismic facies and sedimentary facies, carrying out reservoir, with low wave impedance muddy limestone rejecting in the equiphase zone between water channel, backreef lagoon, beach between reef, extract the distribution range that low wave impedance comes to determine favourable reservoir unusually.
Carry out the reservoir parameter inverting, the factor of porosity of quantitative forecast reservoir and thickness are finished the fine description of reservoir, may further comprise the steps:
(1) correlationship of reservoir porosity and Acoustic Impedance Data is analyzed in intersection, carries out the reservoir parameter inverting, obtains reservoir porosity and predicts the outcome;
(2) extract the objective interval factor of porosity in the favourable reservoir distribution district that determines and add up greater than 2.5% low wave impedance sampling point and obtain reservoir time thickness, multiplying each other with the reservoir interval velocity obtains the reservoir net thickness and distributes;
(3) on above-mentioned reservoir porosity prediction and thickness prediction achievement basis, carry out reservoir comprehensive evaluation, finish the fine description of reservoir.
The present invention is to be constraint with seismic facies and sedimentary facies, in the interpolation and laterally match extrapolation of carrying out under the control of sedimentary facies modified line between well, structure meets the block primary wave impedance model of reef beach geologic characteristics, come underground rock stratum space structure and physical property are found the solution by well log constrained seismic inversion, and then under the constraint of seismic facies and sedimentary facies, carry out the second interpretation of reservoir, the space spread feature of fine description reef beach reservoir, reservoir quantitative forecast precision is obviously improved, the calculation of reserves precision is higher, result of calculation is more reliable, has significantly improved the exploration economic benefit of the complicated reef of super deep layer beach reservoir.
Description of drawings:
Fig. 1 is a FB(flow block) of the present invention;
Fig. 2 is the present invention and prior art initial model effect contrast figure;
Fig. 3 is the present invention and prior art inverting section comparison diagram.
Embodiment:
The present invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1, the present invention includes following steps:
1. zone of interest sedimentary facies spread is determined in meticulous depiction sedimentary facies modified line;
2. make up the primary wave impedance model that meets reef beach geologic characteristics, carry out phased well logging constraint inverting, obtain conventional Acoustic Impedance Data body;
3. the secondary modeling makes up meticulousr phased initial model, carries out phased wave impedance inversion of secondary and gamma inverting, obtains reflecting the Acoustic Impedance Data body of pure reservoir;
4. extract low wave impedance and come to determine the distribution range of favourable reservoir unusually;
5. carry out the reservoir parameter inverting, the factor of porosity of quantitative forecast reservoir and thickness are finished the fine description of reservoir.
Wherein, zone of interest sedimentary facies spread is determined in the modified line of the 1. described meticulous depiction sedimentary facies of step, draws a circle to approve favourable facies tract and distributes, and comprising:
(1) carries out well and shake meticulous demarcation, set up rational geologic model and carry out earthquake and just drilling research, determine the seismic reservoir response characteristic, set up the seismic recognition pattern of reservoir and the seismic facies recognition mode of different sedimentary facies belts;
(2) seismic phase recognition mode in base area is carried out seismic phase analysis accurately, and the planar distribution feature of seismic phase changes into sedimentary facies in conjunction with drilling geology research with seismic facies definitely, accurately portrays the sedimentary facies modified line, determines zone of interest sedimentary facies spread feature;
The 2. described structure of step meets the primary wave impedance model of reef beach geologic characteristics, carries out phased well logging constraint inverting, obtains conventional Acoustic Impedance Data body.Comprise:
(1) utilize structure meticulous interpretation layer position and layer data achievement to make up stratum frame model accurately;
(2) be constraint with seismic facies and sedimentary facies, the well that adheres to different sedimentary facies belts separately is carried out well curvature correction and normalized respectively, utilize interpolation and laterally match extrapolation between sediment phase change line traffic control well, structure meets the phased initial model of reef beach geologic characteristics, as shown in Figure 2, the initial model that the phased modeling technique that the present invention adopts obtains, reflected accurately Xiang Jiao beach, carbonate platform edge reservoir in length and breadth to the spread feature, interpolation between well and extrapolation meet this district's geologic rule, and the model stratiform feature that conventional method obtains is obvious, is not inconsistent with the geologic feature of " bulk; horizontal change is fast " of reef beach reservoir;
(3) utilize this model to carry out well logging constraint inverting, obtain conventional Acoustic Impedance Data body.
The 3. described secondary modeling of step makes up meticulousr phased initial model, carries out phased wave impedance inversion of secondary and gamma inverting, obtains reflecting the Acoustic Impedance Data body of pure reservoir.Comprise:
(1) on the Acoustic Impedance Data body, carries out the meticulous demarcation of secondary and the reservoir preliminary interpretation of reservoir, determine top, the bottom boundary of reservoir, and then will carry out the phased modeling of secondary in reservoir top, the bottom boundary adding stratum frame model, make up meticulousr primary wave impedance model, carry out secondary well logging constraint wave impedance inversion;
(2) utilize secondary wave impedance inversion data volume to carry out the gamma inverting, set rational gamma threshold value and utilize the gamma body that wave resistance antibody is carried out filtering, remove the muddy limestone interlayer of high gamma, obtain reflecting the Acoustic Impedance Data body of pure reservoir as soft-constraint.
The low wave impedance of the 4. described extraction of step comes to determine the distribution range of favourable reservoir unusually, it is the meticulous explanation of under the constraint of seismic facies and sedimentary facies, carrying out reservoir, with water channel between reef, backreef lagoon, low wave impedance muddy limestone rejecting in the equiphase zone between the beach, extract low wave impedance and come to determine the distribution range of favourable reservoir unusually, as shown in Figure 3, conventional inverting Acoustic Impedance Data can be discerned the reef beach reservoir of big cover, but the reflection to interlayer is unclear, the inverting data that the phased inversion technique that the present invention adopts obtains can more clearly describe reef beach reservoir in length and breadth to the distribution minutia.
Step is 5. described carries out the reservoir parameter inverting, and the factor of porosity of quantitative forecast reservoir and thickness distribution are finished the fine description of reservoir.Comprise:
(1) correlationship of reservoir porosity and Acoustic Impedance Data is analyzed in intersection, carries out the reservoir parameter inverting, obtains reservoir porosity and predicts the outcome;
(2) extract the objective interval factor of porosity in the favourable reservoir distribution district that determines and add up greater than 2.5% low wave impedance sampling point and obtain reservoir time thickness, multiplying each other with the reservoir interval velocity obtains the reservoir net thickness and distributes;
(3) on above-mentioned reservoir porosity prediction and thickness prediction achievement basis, carry out reservoir comprehensive evaluation, finish the fine description of reservoir.
Claims (6)
1. complicated reef beach method for predicting reservoir is characterized in that may further comprise the steps:
1. zone of interest sedimentary facies spread is determined in meticulous depiction sedimentary facies modified line;
2. make up the primary wave impedance model that meets reef beach geologic characteristics, carry out phased well logging constraint inverting, obtain conventional Acoustic Impedance Data body;
3. the secondary modeling makes up meticulousr phased initial model, carries out phased wave impedance inversion of secondary and gamma inverting, obtains reflecting the Acoustic Impedance Data body of pure reservoir;
4. extract low wave impedance and come to determine the distribution range of favourable reservoir unusually;
5. carry out the reservoir parameter inverting, the factor of porosity of quantitative forecast reservoir and thickness are finished the fine description of reservoir.
2. a kind of complicated reef according to claim 1 beach method for predicting reservoir is characterized in that: the modified line of meticulous depiction sedimentary facies, determine zone of interest sedimentary facies spread, and may further comprise the steps:
(1) carries out well and shake meticulous demarcation, set up rational geologic model and carry out earthquake and just drilling research, determine the seismic reservoir response characteristic, set up the seismic recognition pattern of reservoir and the seismic facies recognition mode of different sedimentary facies belts;
(2) seismic phase recognition mode in base area is carried out seismic phase analysis accurately, and the planar distribution feature of seismic phase changes into sedimentary facies in conjunction with drilling geology research with seismic facies definitely, accurately portrays the sedimentary facies modified line, determines zone of interest sedimentary facies spread feature.
3. a kind of complicated reef according to claim 1 and 2 beach method for predicting reservoir is characterized in that: make up the primary wave impedance model that meets reef beach geologic characteristics, carry out phased well logging constraint inverting, obtain conventional Acoustic Impedance Data body, may further comprise the steps:
(1) utilize structure meticulous interpretation layer position and layer data achievement to make up stratum frame model accurately;
(2) be guidance with known geologic rule, with seismic facies and sedimentary facies is constraint, the well that adheres to different sedimentary facies belts separately is carried out well curvature correction and normalized respectively, utilize interpolation and laterally match extrapolation between sediment phase change line traffic control well, make up the phased initial model that meets reef beach geologic characteristics;
(3) utilize this model to carry out well logging constraint inverting, obtain conventional Acoustic Impedance Data body.
4. a kind of complicated reef according to claim 3 beach method for predicting reservoir, it is characterized in that: the secondary modeling makes up meticulousr phased initial model, carry out phased wave impedance inversion of secondary and gamma inverting, obtain reflecting the Acoustic Impedance Data body of pure reservoir, may further comprise the steps:
(1) on the Acoustic Impedance Data body, carries out the meticulous demarcation of secondary and the reservoir preliminary interpretation of reservoir, determine top, the bottom boundary of reservoir, and then will carry out the phased modeling of secondary in reservoir top, the bottom boundary adding stratum frame model, make up meticulousr primary wave impedance model, carry out secondary well logging constraint wave impedance inversion;
(2) utilize secondary wave impedance inversion data volume to carry out the gamma inverting, set rational gamma threshold value and utilize the gamma body that wave resistance antibody is carried out filtering, remove the muddy limestone interlayer of high gamma, obtain reflecting the Acoustic Impedance Data body of pure reservoir as soft-constraint.
5. a kind of complicated reef according to claim 4 beach method for predicting reservoir, it is characterized in that: extract the distribution range that low wave impedance comes to determine favourable reservoir unusually, it is the meticulous explanation of under the constraint of seismic facies and sedimentary facies, carrying out reservoir, with low wave impedance muddy limestone rejecting in the equiphase zone between water channel, backreef lagoon, beach between reef, extract the distribution range that low wave impedance comes to determine favourable reservoir unusually.
6. a kind of complicated reef according to claim 5 beach method for predicting reservoir, 5. its feature carries out the reservoir parameter inverting, and the factor of porosity of quantitative forecast reservoir and thickness are finished the fine description of reservoir, may further comprise the steps:
(1) correlationship of reservoir porosity and Acoustic Impedance Data is analyzed in intersection, carries out the reservoir parameter inverting, obtains reservoir porosity and predicts the outcome;
(2) extract the objective interval factor of porosity in the favourable reservoir distribution district that determines and add up greater than 2.5% low wave impedance sampling point and obtain reservoir time thickness, multiplying each other with the reservoir interval velocity obtains the reservoir net thickness and distributes;
(3) on above-mentioned reservoir porosity prediction and thickness prediction achievement basis, carry out reservoir comprehensive evaluation, finish the fine description of reservoir.
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