CN105572726A - Fine drawing method for multistage laminated sector under lithostratigraphic architecture - Google Patents
Fine drawing method for multistage laminated sector under lithostratigraphic architecture Download PDFInfo
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Abstract
The invention discloses a fine drawing method for a multistage laminated sector under a lithostratigraphic architecture. The fine drawing method comprises the steps of (a) establishing a work-area stratigraphic architecture; (b) determining the characteristic of a sector boundary on a seismic profile in the stratigraphic architecture; (c) determining the response characteristic of the sector boundary on a logging curve; (d) drawing a single-stage single sector boundary on each contrast profile through seismic data and logging data; and (e) establishing a backbone contrast profile, and repeating the steps (b) to (d), determining each stage sandstone boundary point, and finely drawing a multistage-laminated sector assembly. The fine drawing method has advantages of sufficiently exerting advantages of the seismic data and the logging data, improving precision in drawing the sector boundary through comprehensively utilizing the advantages of data, and improving the grade in drawing the single sector.
Description
Technical field
The present invention relates to oil exploration technology field, a kind of meticulous depiction method of time stacked fan body of many phases under specifically referring to sequence stratigraphic framework.
Background technology
Stratigraphic framework (stratigraphicframework, stratigraphicarchitecture) is the regional space-time ordered arrangement pattern being widely used in all kinds of stratum or lithologic unit in bed succession: Lithostratigraphic Framework (lithostratigraphicframework/architecture) reflects stratum and lithologic unit space arrangement pattern; Chronological change screen work (chronostratigraphicframework/architecture) reflects stratum or lithologic unit space-time type of array.The vertical superimposition of sedimentary formation that Steno discussed in 1667, side direction continuously, original level principle, can be described as original Stratigraphic framework concept; Sequence stratigraphic framework is then the Typical Representative of contemporary Stratigraphic framework concept.
The professional conceptual that the present invention relates to is as follows:
(1) Stratigraphic framework: the regional space-time ordered arrangement pattern of all kinds of stratum or lithologic unit in bed succession.
(2) fan body: outfall fan is the fan-shaped accumulation body that river goes out mountain pass place.The plane of fan body generally comprises water channel, between dike and water channel.Longitudinal profile can be divided into fan (interior wing), middle fan, lower fan (exterior wing).Because turbidite fan sand body is general near hydrocarbon source rock, grows in groups, easily become favourable oil-gas exploration region with its favourable source-reservoir-seal assemblage condition.Fan body reservoir is the main Storage category of rich accumulation of oil and gas and exploratory development research, has major significance to the analysis of portraying description and advantage facies tract and reservoir inner structure of fan body to oil-gas exploration and development.
(3) fan body is portrayed: by using the multiple theory and technology such as geology, geophysics, describing and portraying form and the distribution range of fan body and ingredient thereof, finding and implement the favored site of oil gas reservoir.
Due to nonuniformity and the general more complicated of cyclicity of fan body, the deficiency that several fan body recognition technology of current tradition all exists, so mostly rest on the basis of qualitative description to portraying of fan body at present, cannot carry out quantitative accurate description.
(1) method of seismic data amplitude attribute is utilized: usually present strong amplitude according to Sand member and portray fan body compared with the feature of continuous print seismic response features, using seismic properties to portray fan body border is conventional a kind of way, but because the vertical resolution of seismic data is limited, under sequence stratigraphic framework, do not portray sand body simultaneously, the fan body of growing is superposed mutually to many phases time can not tell single fan body on vertical, only can portray cover fan body more than a fan body group or a thing source growth and concentrate the border of growth, precision is lower.
(2) utilize the method for seismic data spectral decomposition: the processing links that just in seism processing one of the spectral decomposition of seismic data is isolated, all may distort the useful information seismic signal primitive character from processes such as collecting superposition, skew.And the data processing and explanation of these information to high precision, high reliability is vital.The method is subject to the restriction of seismic data quality and actual geological condition, and carrying out spectrum analysis to real data needs in conjunction with various data and other disposal routes of conbined usage, can improve the quality of process and the reliability of explanation.
(3) seismic model forward modeling method: coherence properties is combined with strata slicing by seismic data FREQUENCY SPECTRUM DECOMPOSITION TECHNIQUE by the method, use electrofacies, sedimentary facies data, set up seismic model just to drill, integrated forecasting is carried out to fan body, the method is higher to data degree of dependence, therefore cannot set up forward model accurately without well or few well area, precision of prediction is limited to data situation, is of limited application.
(4) seismic facies analysis method: change method infers sedimentary environment change by seismic facies analysis, determine the sedimentary facies belt of reservoir and the distribution range of fan body, the observation of using well-log information and rock core is needed to the determination of seismic facies and sedimentary facies corresponding relation simultaneously, judge sedimentary facies belt for there is no the area of well or not boring the regional compare difficulty of meeting Special Earthquakes body.Meanwhile, human factor is more, and seismic data longitudinal frame is limited, and precision is generally lower than 20 meters, and be difficult to divide the fan body that single thickness is less than 20 meters on therefore vertical, can only portray profile roughly for time stacked fan body of many phases, precision is lower.
Summary of the invention
A kind of meticulous depiction method of time stacked fan body of many phases under the object of the present invention is to provide sequence stratigraphic framework, realization establishes high-precision sequence stratigraphy framework, under the constraint of screen work inside, portray sand body, overcome the problem that conventional art can only portray fan body group.Limit the scope that fan body is portrayed simultaneously, improve the precision that fan body is portrayed, inner at high-resolution sequence framework, in conjunction with the earthquake on fan body border and the individual features of well-log information, determine that fan body grows border, portray the growth scope of single fan body.This technology solves current fan body and portrays the lower problem of the precision of existence, reaches the object improving and portray precision.
Object of the present invention is achieved through the following technical solutions:
A meticulous depiction method for time stacked fan body of many phases under sequence stratigraphic framework, comprises the following steps:
A () sets up work area sequence stratigraphy framework;
B () determines the feature of fan body border on seismic section in Stratigraphic framework inside;
C () determines the response characteristic of fan body border on logging trace;
D () portrays single single fan body border on each bar contrast section by seismic data and well-log information;
E () foundation key contrast section, repeats step (b) to step (d), determines every first phase time sandstone frontier point, accurately portray secondary stacked fan body complex of many phases.
Above step mainly establishes high-precision sequence stratigraphic framework, limit the scope of portraying fan body, improve fan body and portray precision, simultaneously in conjunction with the response characteristic of fan body border in earthquake and well-log information, earthquake is utilized to walk crosswise the high advantage of resolution, advantage that well-log information vertical resolution is high, comprehensively portray single fan body, improve the precision that fan body describes on section and in plane.
Described step (a) is set up work area sequence stratigraphy framework and is comprised the following steps:
(a1) inner at seismic strata screen work, according to spontaneous potential SP features of logging curve, differentiate is carried out to SP curve values;
(a2) in the hope of first order derivative be 0 and second derivative is not equal to the maximum value or minimum value of the point of 0 or the transfer point indicative curve of first order derivative positive and negative values, wherein first order derivative is by just becoming negative indication maximum value and crest, and first order derivative is just representing minimal value and trough by bearing change; Second derivative be 0 and three order derivatives be not equal to 0 point or the positive and negative transfer point of second derivative as point of inflexion on a curve, construct sequence stratigraphy framework; Wherein second derivative is just representing interface location under certain layer by bearing change, and second derivative is by just becoming interface location on negative indication same layer.
This step mainly first sets up seismic strata Sequence Stratigraphic Formation, and this screen work is lower by seismic data resolution limiting, and general zone thickness of differentiating is at more than 20m.Then under seismic strata screen work, well shake combines, set up the relation between seismic time territory and well-log information Depth Domain, use the advantage that well-log information resolution on vertical is high, use the feature of spontaneous potential curve SP differentiate reaction stratigraphic cycles to set up high-precision sequence stratigraphic framework.Fully use the combination of earthquake and well-log information relative to prior art, and divided sedimentary cycle by the method for the automatic differentiate of spontaneous potential SP curve, effectively raise the precision that Stratigraphic framework is set up.
In Stratigraphic framework inside, described step (b) determines that the feature of fan body border on seismic section comprises the following steps:
(b1) zone thickness sudden change, lineups occur interrupted;
(b2) lineups occur stacked, and amplitude strengthens suddenly;
(b3) by contrast and lineups variation characteristic between well, the position of fan body abrupt changes in thickness is determined.
Determine that many utilizations seismic properties in fan body border is determined at present, but there is multi-solution in seismic properties, and the scope of a fan body group can only be determined in plane, this step in the individual features determining fan body edge, then spreads to plane to determine fan body border by section from section.
Described step (c) determines that the response characteristic of fan body border on logging trace comprises the following steps:
(c1) portray individual well sandstone thickness by logging trace, and carry out contrasting between well under sequence stratigraphic framework;
(c2) the unexpected increase of sandstone thickness or the change point of minimizing is determined.
This technology is under High Resolution Sequence Stratigraphic Framework, between well, contrast the variation tendency determining sand body.At well pattern improvement position, between offset well, within the scope of a well spacing there is the pinching of sand body or variation in thickness then can be judged as fan body border more than 50% in (300m), at the relatively large position of well spacing (being greater than 500m), and the fan body border selecting seismic data to determine.
Single the single fan body border that described step (d) is portrayed on each bar contrast section by seismic data and well-log information comprises the following steps;
(d1) individual well well point constraint;
(d2) seismic data interpolation arithmetic;
(d3) under the unified constraint of succession of strata general layout, single single fan body border on each bar contrast section is accurately portrayed.
Under sequence stratigraphic framework, use single well point to portray border in conjunction with earthquake interpolation arithmetic, comprehensively portray fan body border, this step overcomes the limitation that traditional alone earthquake or well-log information portray fan body, improves the precision that fan body is portrayed.
The present invention compared with prior art, has following advantage and beneficial effect:
1 the present invention is the meticulous depiction method of time stacked fan body of many phases under a kind of sequence stratigraphic framework;
(1) the present invention establishes High Resolution Sequence Stratigraphic Framework, improves the precision of sequence stratigraphic framework
The present invention first sets up seismic strata Sequence Stratigraphic Formation, and this screen work is lower by seismic data resolution limiting, and general zone thickness of differentiating is at more than 20m.Then under seismic strata screen work, well shake combines, set up the relation between seismic time territory and well-log information Depth Domain, use the advantage that well-log information resolution on vertical is high, use the feature of spontaneous potential curve SP differentiate reaction stratigraphic cycles to set up high-precision sequence stratigraphic framework.Fully use the combination of earthquake and well-log information relative to prior art, and divided sedimentary cycle by the method for the automatic differentiate of spontaneous potential SP curve, effectively raise the precision that Stratigraphic framework is set up.
(2) vertical resolution due to seismic data is limited, under sequence stratigraphic framework, do not portray sand body simultaneously, the fan body of growing is superposed mutually to many phases time can not tell single fan body on vertical, only can portray cover fan body more than a fan body group or a thing source growth and concentrate the border of growth, precision is lower.Seismic data longitudinal frame is limited, and precision is generally lower than 20 meters, and be difficult to divide the fan body that single thickness is less than 20 meters on therefore vertical, can only portray profile roughly for time stacked fan body of many phases, precision is lower.The present invention gives full play to the advantage of seismic data and well-log information, and the advantage of the every data of integrated use improves the precision of portraying fan body border, brings up to the rank of portraying single fan body.
Accompanying drawing explanation
Fig. 1 is oil well SP stratigraphic cycles division figure in the embodiment of the present invention;
Fig. 2 is Lian Jing stratum series of strata screen work foundation figure in the embodiment of the present invention;
Fig. 3 be in the embodiment of the present invention each fan body border at seismic cross-section;
Fig. 4 is each fan body border of embodiment of the present invention response characteristic determination fan body boundary graph on seismic section;
Fig. 5 is that the embodiment of the present invention infers fan body border boundary figure in the plane;
Fig. 6 is that between embodiment of the present invention well, fan body border and superimposed station diagram are determined in contrast;
Fig. 7 is that the embodiment of the present invention completes single fan body and portrays schematic diagram;
Fig. 8 is that the embodiment of the present invention completes first phase fan body and portrays figure;
Fig. 9 is that the embodiment of the present invention completes second phase fan body and portrays figure;
Figure 10 is that the embodiment of the present invention completes third phase fan body and portrays figure;
Figure 11 is that the embodiment of the present invention completes fourth phase fan body and portrays figure; .
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
Portray for one of Kazakhstan oil field group of oil reservoir fan body, according to many phases under a kind of sequence stratigraphic framework of the present invention, the meticulous depiction method of time stacked fan body implements following steps successively:
(a1) inner at seismic strata screen work, according to spontaneous potential SP features of logging curve, differentiate is carried out to SP curve values;
(a2) in the hope of first order derivative be 0 and second derivative is not equal to the maximum value or minimum value of the point of 0 or the transfer point indicative curve of first order derivative positive and negative values, wherein first order derivative is by just becoming negative indication maximum value and crest, and first order derivative is just representing minimal value and trough by bearing change; Second derivative be 0 and three order derivatives be not equal to 0 point or the positive and negative transfer point of second derivative as point of inflexion on a curve, construct sequence stratigraphy framework; Wherein second derivative is just representing interface location under certain layer by bearing change, and second derivative is by just becoming interface location on negative indication same layer; Use natural potential logging curve S P, seismic data etc., determine border and the space distribution of single fan body: the determination of reference field cycle in mid-term divides according to spontaneous potential (SP) features of logging curve and in conjunction with existing core column; Logging trace is a kind of response forms of stratigraphic record, the transfer point of the level cycle corresponding to subsequence border, stratigraphic record is be converted to feature with inundation mud stone and phase sequence form; Therefore on logging trace, on the one hand can according to the low-resistivity of inundation mud stone, high natural gamma feature identification subsequence border, another aspect also can using the conversion of logging trace pattern as reference foundation; The transition form of logging trace, with regard to natural gamma, has obvious progradation, adds sum and move back long-pending; With regard to spontaneous potential, there is obvious sand shale transfer point.As shown in Figure 1, the basis being recorded in reference field cycle in mid-term marks off the cycle of reference field short-term further, contrasted the cycle feature of many mouthfuls of wells according to sand shale in these features and core column, the Sequence Stratigraphic Formation of the company's of foundation well, as shown in Figure 2;
B () determines the feature of fan body border on seismic section in Stratigraphic framework inside; (b1) zone thickness sudden change, lineups occur interrupted; (b2) lineups occur stacked, and amplitude strengthens suddenly; (b3) by contrast and lineups variation characteristic between well, the position of fan body abrupt changes in thickness is determined.Portray fan body border according to the response characteristic of each fan body border on seismic section: zone thickness suddenlys change, lineups occur interrupted; Lineups occur stacked, and amplitude strengthens suddenly.By contrast and lineups variation characteristic between well, find out the position of fan body abrupt changes in thickness; SPA sudden phase anomalies as shown in Figure 4; By to put and fan body border boundary is in the plane inferred as shown in Figure 5 in face.
C () determines the response characteristic of fan body border on logging trace; (c1) portray individual well sandstone thickness by logging trace, and carry out contrasting between well under sequence stratigraphic framework; (c2) the unexpected increase of sandstone thickness or the change point of minimizing is determined.As shown in Figure 6, between well, the variation tendency determining sand body is contrasted.At well pattern improvement position, between offset well, within the scope of a well spacing there is the pinching of sand body or variation in thickness then can be judged as fan body border more than 50% in (300m), at the relatively large position of well spacing (being greater than 500m), and the fan body border selecting seismic data to determine.
D () portrays single single fan body border on each bar contrast section by seismic data and well-log information; As shown in Figure 7, complete single fan body by seismic data and well-log information to portray; (d1) individual well well point constraint; (d2) seismic data interpolation arithmetic; (d3) under the unified constraint of succession of strata general layout, single single fan body border on each bar contrast section is accurately portrayed.
E () foundation key contrast section, repeats step (b) to step (d), determines every first phase time sandstone frontier point, accurately portray secondary stacked fan body complex of many phases, as shown in Figs. 8 to 11.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention, every according in technical spirit of the present invention to any simple modification, equivalent variations that above embodiment is done, all fall within protection scope of the present invention.
Claims (5)
1. the meticulous depiction method of time stacked fan body of many phases under sequence stratigraphic framework, is characterized in that: comprise the following steps:
A () sets up work area sequence stratigraphy framework;
B () determines the feature of fan body border on seismic section in Stratigraphic framework inside;
C () determines the response characteristic of fan body border on logging trace;
D () portrays single single fan body border on each bar contrast section by seismic data and well-log information;
E () foundation key contrast section, repeats step (b) to step (d), determines every first phase time sandstone frontier point, accurately portray secondary stacked fan body complex of many phases.
2. the meticulous depiction method of time stacked fan body of many phases under a kind of sequence stratigraphic framework according to claim 1, it is characterized in that, described step (a) is set up work area sequence stratigraphy framework and is comprised the following steps:
(a1) inner at seismic strata screen work, according to spontaneous potential SP features of logging curve, differentiate is carried out to SP curve values;
(a2) in the hope of first order derivative be 0 and second derivative is not equal to the maximum value or minimum value of the point of 0 or the transfer point indicative curve of first order derivative positive and negative values, wherein first order derivative is by just becoming negative indication maximum value and crest, and first order derivative is just representing minimal value and trough by bearing change; Second derivative be 0 and three order derivatives be not equal to 0 point or the positive and negative transfer point of second derivative as point of inflexion on a curve, construct sequence stratigraphy framework; Wherein second derivative is just representing interface location under certain layer by bearing change, and second derivative is by just becoming interface location on negative indication same layer.
3. the meticulous depiction method of time stacked fan body of many phases under a kind of sequence stratigraphic framework according to claim 1, it is characterized in that, in Stratigraphic framework inside, described step (b) determines that the feature of fan body border on seismic section comprises the following steps:
(b1) zone thickness sudden change, lineups occur interrupted;
(b2) lineups occur stacked, and amplitude strengthens suddenly;
(b3) by contrast and lineups variation characteristic between well, the position of fan body abrupt changes in thickness is determined.
4. the meticulous depiction method of time stacked fan body of many phases under a kind of sequence stratigraphic framework according to claim 1, it is characterized in that, described step (c) determines that the response characteristic of fan body border on logging trace comprises the following steps:
(c1) portray individual well sandstone thickness by logging trace, and carry out contrasting between well under sequence stratigraphic framework;
(c2) the unexpected increase of sandstone thickness or the change point of minimizing is determined.
5. the meticulous depiction method of time stacked fan body of many phases under a kind of sequence stratigraphic framework according to claim 1, it is characterized in that, single the single fan body border that described step (d) is portrayed on each bar contrast section by seismic data and well-log information comprises the following steps;
(d1) individual well well point constraint;
(d2) seismic data interpolation arithmetic;
(d3) under the unified constraint of succession of strata general layout, single single fan body border on each bar contrast section is accurately portrayed.
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| CN106990449A (en) * | 2017-04-20 | 2017-07-28 | 中国地质大学（武汉） | A kind of terrestrial face interlayer screen work based on multidimensional data builds characterizing method |
| CN106990449B (en) * | 2017-04-20 | 2019-12-17 | 中国地质大学（武汉） | multi-dimensional data-based continental facies sequence stratigraphic framework construction characterization method |
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| CN108008466B (en) * | 2017-11-07 | 2019-06-11 | 中国石油天然气股份有限公司 | Composite river sedimentation period subspace analysis method based on sand-land ratio |
| CN110727027A (en) * | 2018-07-17 | 2020-01-24 | 中国石油天然气股份有限公司 | Fine carving method for multi-period river sand |
| CN110068859A (en) * | 2019-04-12 | 2019-07-30 | 中国石油大学(华东) | A kind of horizontal well region braid deltas seismic reservoir sedimentology quantitatively characterizing method |
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