CN105116447A - A geological river direction discrimination method based on curvature-abnormal stripes - Google Patents
A geological river direction discrimination method based on curvature-abnormal stripes Download PDFInfo
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Abstract
The invention relates to a geological river direction discrimination method based on curvature-abnormal stripes. The method comprises the following steps: 1), curvature calculating is carried out on seismic waveforms in original seismic data to obtain a curvature-abnormal body, and maximum-curvature plane attribute extraction is carried out on a target layer of the curvature-abnormal body to obtain a maximum-curvature plane attribute of the curvature-abnormal body; 2) de-noising processing is carried out on maximum-curvature plane attribute of the target layer of the curvature-abnormal body; 3) according to the maximum-curvature plane attribute obtained after the de-noising processing, a single-river channel is obtained; step 301) plane division of the maximum-curvature plane attribute is carried out to obtain curvature-abnormal stripe distribution areas, and each curvature-abnormal stripe distribution area is a boundary of the single-river channel; and 302) logging response characteristic analysis is carried out on the different curvature-abnormal stripe distribution areas to correct the boundary of the single-river channel; and 4) in each curvature-abnormal stripe distribution area, the curvature-abnormal stripes are sequentially connected in a series mode to determine the direction of an advantageous mainstream line in the single-river channel.
Description
Technical field
The present invention relates to exploratory engineering of off-shore petroleum/gas reservoir exploitation geological technique field, particularly about a kind of geology river course discriminating direction method based on curvature anomalies band.
Background technology
In China's developed field, critical role is occupied based on the complicated fluvial facies oil reservoir of meandering stream deposit reservoir, such reservoir is faced with injection-production pattern imperfection in waterflooding, waterflooding effect is undesirable, reserves exploitation degree is low, adjust well disposes the problems such as difficulty is large, and Geological Reasons of searching to the bottom is still unclear for river channel sand spreading direction understanding.Very ripe for the research of river channel sand under onshore oil field dense well pattern condition, improved and developed configuration fine dissection technology and theory, research precision can deeply to point bar private side lamination level.Under the condition of about 50m small well spacing, auxiliary with horizontal well, core hole, the data such as Production development, river course spreading direction can be judged accurately by contrast between meticulous well, even also can be judged for the dominant flowing path under the impact of river course private side lamination.
Marine fluvial depositional reservoir exploitation is far different with onshore oil field, be limited by platform size and cost of development limit the feature defining wide spacing, wide spacing, therefore land theory based on well and method are difficult to apply, and are more to rely on high-precision earthquake information by exploring different attributes to realize the prediction for river course spreading direction.But for side stacked shape sand body in flakes, sand body plane all directions are moniliform distribution feature, the attribute of conventional reflection sand thickness change is made to be difficult to effectively judge river course spreading direction, scientific research personnel has also done a large amount of research work for this reason, to ensureing authenticity and the rationality of result of determination, but due to the problem of Research Thinking and Geological Mode cognition, there is no larger progress all the time.
Summary of the invention
For the problems referred to above, the object of the invention is to provide a kind of geology river course discriminating direction method based on curvature anomalies band for offshore oilfield, accurately can judge the side stacked inner direction, river course of sand body in flakes.
For achieving the above object, the present invention takes following technical scheme: a kind of geology river course discriminating direction method based on curvature anomalies band, comprise the following steps: 1) curvature estimation is carried out to the seismic waveshape in the original seismic data in oil field, obtain the curvature anomalies body of original seismic data, and the extraction of maximum curvature plane properties is carried out to curvature anomalies body zone of interest position, obtain the maximum curvature plane properties of curvature anomalies body zone of interest position; 2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body zone of interest position; 3) according to the maximum curvature plane properties obtained after denoising, set about from the difference between the band response of single river course itself and the response of different single river courses band, identification form river course band, specifically comprise the following steps: 301) close according to the abnormal band feature of single river course band inner curvature, between different single river courses band, curvature anomalies band feature this principle variant carries out the plane subregion of maximum curvature plane properties, obtain curvature anomalies band distributive province, the border of each curvature anomalies band distributive province and band border, corresponding single river course; 302) logging response character analysis is carried out to the abnormal band distributive province of different curvature, by the border of distinguishing mark further identification form river course band, to repair card band border, single river course; 4) inner in the curvature anomalies band distributive province divided, each curvature anomalies band of connecting successively, determine band internal advantages main stream line direction, single river course, advantage main stream line direction is band direction, single river course.
Described step 2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body zone of interest position, comprise the following steps: 201) first the tomography on curvature anomalies body zone of interest position is identified and explained, and cut the seismic section of curvature anomalies band one by one, then draw a circle to approve the region of faulting; 202) unify assignment to maximum curvature plane properties value in each delineation region, assignment is 0, draws a circle to approve extra-regional maximum curvature plane properties value and remains unchanged; 203) according to the maximum curvature plane properties value after new assignment, re-start the one-tenth figure of maximum curvature plane properties, obtain the maximum curvature plane properties figure after denoising.
Described step 203) in the plane of maximum curvature plane properties become figure to adopt the makesurface module of petrel software to realize.
Described step 302) in the distinguishing mark of logging response character analysis comprise difference in thickness, tracing pattern and the distribution range in study area.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention calculates curvature anomalies body by original seismic data, and extract the maximum curvature plane properties of curvature anomalies body zone of interest position, in attributed graph, the linear delineation region of non-uniform Distribution is referred to as curvature anomalies band, due to stacked sand body in flakes inner different single river courses band difference all to some extent in curvature anomalies band plane distribution and logging response character, therefore at sea wide spacing, in conjunction with the Distribution Pattern of the abnormal band of maximum curvature plane properties mean curvature under the condition of wide spacing, the tracing pattern of each well point and characteristics of combination spatially, can comprehensive identification form river course band, overcome offshore oilfield wide spacing, the difficulty of wide spacing, improve the cognition degree for the side stacked inner direction, single river course of sand body in flakes, for the deployment of oil-field development injection-production pattern, Tapping Residual Oil provides strong support.2, the present invention is by the introducing of curvature anomalies band and the deciphering of corresponding Geological Mode, effectively make use of marine high-precision seismic data, and workable, and the physical prospecting personnel for geology experiences deficiency also can grasp fast; 3, the present invention focuses on setting about from the difference between single river course band itself and different single river courses band, utilize the difference of the abnormal band distribution of maximum curvature plane properties mean curvature to carry out plane subregion and single river course logging response character correction analysis two-step approach own and determine band border, single river course, when determining single river course band under being therefore different from dense well pattern condition, the transition of band border, single river course distinguishing mark is relied on.4, the present invention is not only applicable to meandering river type river channel sand, can also be applied in the middle of distributary channel molding sand body.The present invention can be widely used in the exploitation of the sand body in flakes of river channel type under offshore oilfield wide spacing condition.
Accompanying drawing explanation
Fig. 1 is that embodiment of the present invention mean curvature anomalous body maximum curvature plane properties extracts and faulting region delineation schematic diagram, and wherein, arrow indication region is the region of maximum curvature plane properties by faulting interference;
Fig. 2 is the maximum curvature plane properties figure in the embodiment of the present invention after denoising, and wherein, the linear delineation region of non-uniform Distribution is referred to as curvature anomalies band;
Fig. 3 is the plane block plan of curvature anomalies band on the maximum curvature plane properties in the embodiment of the present invention after denoising;
Fig. 4 is that in the embodiment of the present invention, river course pattern classification comprehensively identifies schematic diagram;
Fig. 5 is dissimilar river course flat distribution map in the embodiment of the present invention;
Fig. 6 is band border, single river course schematic diagram after revising in the embodiment of the present invention, and wherein, "+" represents study area well location,
represent and revise border, Hou① district,
represent and revise border, Hou② district,
represent and revise border, Hou③ district;
Fig. 7 is river course advantage main stream line schematic diagram in the embodiment of the present invention, and wherein, "+" represents study area well location,
represent and revise border, Hou① district,
represent and revise border, Hou② district,
represent and revise border, Hou③ district,
represent river course advantage main stream line.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Geology river course discriminating direction method based on curvature anomalies band provided by the invention, comprises the following steps:
1) existing computing method are adopted to carry out curvature estimation to the seismic waveshape in the original seismic data in oil field, obtain the curvature anomalies body of original seismic data, curvature anomalies body refers to the data volume of seismic waveshape curvature in three-dimensional change, and adopt existing method to carry out the extraction of maximum curvature plane properties to curvature anomalies body zone of interest position, obtain the maximum curvature plane properties of curvature anomalies body zone of interest position;
2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body zone of interest position, denoising refers to by analyzing the curvature anomalies band eliminated maximum curvature plane properties interrupting layer interference effect and produce, retain the sedimentogenic curvature anomalies band of river channel sand, sedimentary origin mainly comprises the stacked or horizontal pinching of sand body, wherein, denoising comprises the following steps:
201) first adopt the mode of existing flat cutting interaction to identify and explain to the tomography on curvature anomalies body zone of interest position, and cut the seismic section of curvature anomalies band one by one, then draw a circle to approve the region of faulting;
202) unify assignment to maximum curvature plane properties value in each delineation region, assignment is 0, draws a circle to approve extra-regional maximum curvature plane properties value and remains unchanged;
203) according to the maximum curvature plane properties value after new assignment, re-start the one-tenth figure of maximum curvature plane properties, obtain the maximum curvature plane properties figure after denoising, wherein, the one-tenth figure of maximum curvature plane properties can adopt the makesurface module of petrel software to realize.
3) according to the maximum curvature plane properties obtained after denoising, set about from the difference between the band response of single river course itself and the response of different single river courses band, identification form river course band, specifically comprises the following steps:
301) close according to the abnormal band feature of single river course band inner curvature, between different single river courses band, curvature anomalies band feature this principle variant carries out the plane subregion of maximum curvature plane properties, and then obtaining curvature anomalies band block plan, the border of each curvature anomalies ribbon area is the border of single river course band;
302) carry out logging response character analysis to the abnormal band distributive province of different curvature, by the border of distinguishing mark further identification form river course band, to repair card band border, single river course, wherein, the distinguishing mark of logging response character analysis comprises:
A, difference in thickness: the difference supplied due to different river courses shaping age hydrodynamic condition and thing source, will inevitably difference be there is in sand thickness, therefore can distinguish different single river channel sand according to the total sand thickness of combination channel, average sand thickness and single sand thickness;
B, tracing pattern: different channel deposit, because of the difference of prop-carrying capacity, causes the difference on log response characteristics, from the angle of statistics, the similar probability of same river channel sand tracing pattern will much larger than the difference of different river channel sand tracing pattern;
C, distribution range in study area: according to the principle of the identical origin cause of formation in similar river course, determine that dissimilar river course is in study area proportion and plane distributing scope;
The border of single river course band is comprehensively determined by the difference in thickness on the logging trace of study area, tracing pattern difference, distribution range in study area.
4) inner in each the curvature anomalies band distributive province divided, to connect successively each curvature anomalies band, determine band internal advantages main stream line direction, single river course, the sedimentary evolution in river course is a process swung along with the continuous lateral migration of flood event, but can be fixed in a certain scope at a certain fixed time period single river channel band, main stream line also relative advantage can concentrate on this scope, and therefore advantage main stream line direction is band direction, single river course, so far completes river course direction determining.
Embodiment:
Q oil field is positioned in the middle part of Bohai Offshore, and be a Large River phase sandstone viscous crude field, main oil-bearing series is Neogene System Ming Hua town group hypomere and Guantao group, and wherein, bright hypomere can be divided into Nm0, Nm I, Nm II, Nm III, Nm IV and Nm V totally 6 oily group.Reservoir is based on positive rhythm and compound rhythm meander river course sedimentary sand bodies.Ming Hua town, this area group fluvial sandstone, according to configuration characteristic, is divided into stacked, side stack-type and stand alone 3 type by forefathers.For side stack-type sand body, most notable feature is exactly that to swing ability relatively strong for channel migration, there is the animal migration of certain orientation in the horizontal, river channel sand side direction overlaps, aggregate performance is sand body shape distribution in flakes, on seismic section, reflection line-ups is connected, but waveform presents unconspicuous flexure (not disconnecting).For this region, adopt the present invention to carry out geology river course discriminating direction and comprise the following steps:
1) calculate on the basis of the original seismic data in Q oil field, obtain the curvature anomalies body of original seismic data, and carry out the extraction of maximum curvature plane properties for curvature anomalies body zone of interest position, obtain the maximum curvature plane properties of curvature anomalies body zone of interest position;
Curvature is a kind of two dimensional character of curve from the principle, it is described that the degree of crook of certain point on curve, for the amplitude of waveform, obviously, therefore curvature attributes can well reflect the feature on the stacked border of tomography, sedimentary sand bodies in the various variations in detail response such as form.
2) carry out denoising to the maximum curvature plane properties of curvature anomalies body zone of interest position, concrete steps are:
201) first the mode of flat cutting interaction is adopted to identify and explain (earthquake speciality personnel all grasp) to the tomography on curvature anomalies body zone of interest position, and cut the seismic section of curvature anomalies band one by one, then draw a circle to approve the region (as shown in Figure 1) of faulting;
202) unify assignment to maximum curvature plane properties value in each delineation region, assignment is 0, draws a circle to approve extra-regional maximum curvature plane properties value and remains unchanged;
203) according to the maximum curvature plane properties value after new assignment, re-start the one-tenth figure of maximum curvature plane properties, obtain the maximum curvature plane properties figure (as shown in Figure 2) after denoising;
3) according to the maximum curvature plane properties obtained after denoising, set about from the difference between the band response of single river course itself and the response of different single river courses band, identification form river course band, specifically comprises the following steps:
301) carry out the plane subregion of maximum curvature plane properties, obtain curvature anomalies band distributive province, the border of each curvature anomalies band distributive province and band border, corresponding single river course;
On Plain, in certain limit, the sand body in flakes of distribution is spliced by many river course side direction, but whether the thing source, single river course of different times supply abundance, hydrodynamic intensity all can cause the difference of type inside, river, being embodied on maximum curvature plane properties is then the regular change of curvature anomalies band, as shown in Figure 3, three curvature anomalies band distributive province can be seen, 1. district, 2. district and 3. between district curvature anomalies band from quantity, distribution density degree, the regularity of transverse and longitudinal extension and arrangement all there is very large difference, 1. district's curvature anomalies band quantity is many, densely distributed, and transverse and longitudinal extends long, NW trending aligns obviously regular, 2. district's curvature anomalies band quantity is few, distributes sparse, and transverse and longitudinal expanded range is short, and it is comparatively obvious that NW trending aligns regularity, 3. district's curvature anomalies band quantitatively few compared with 1. district, compared with 2. district is many, more 2. district is intensive in distribution, but NW trending aligns feature mays be seen indistinctly.
302) carry out logging response character analysis to the abnormal band distributive province of different curvature, by the border of distinguishing mark further identification form river course band, to repair card band border, single river course, detailed process is:
First, different river channel sand is identified according to individual well log response characteristics, wherein, the spontaneous potential (SP of river channel sand, spontaneouspotential) and gamma (GR, naturalgammaray) logging trace show as box or bell; Then, further detailed to every type in difference in thickness, tracing pattern, analyze in the distribution range of study area; Finally, stream channel pattern corresponding for every mouthful of well is projected in study area, and repaiies card and improve step 301) single river course band result.As shown in Figure 4, concrete distinguishing mark is as follows: A, difference in thickness; B, tracing pattern difference; C, distribution range in study area; As shown in Figure 5, wherein, D, M, S represent dissimilar river course respectively, and dissimilar river course is the feature of East and West direction distribution.
The border (as shown in Figure 6) of single river course band comprehensively can be determined by the difference in thickness on the log response characteristics of study area, tracing pattern difference, distribution range in study area.
4) in step 301) the curvature anomalies band distributive province that obtains is inner, and each curvature anomalies band of connecting successively, so far completes river course direction determining (as shown in Figure 7).
The various embodiments described above are only for illustration of the present invention; wherein the structure of each parts, connected mode and manufacture craft etc. all can change to some extent; every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (4)
1., based on a geology river course discriminating direction method for curvature anomalies band, comprise the following steps:
1) curvature estimation is carried out to the seismic waveshape in the original seismic data in oil field, obtain the curvature anomalies body of original seismic data, and the extraction of maximum curvature plane properties is carried out to curvature anomalies body zone of interest position, obtain the maximum curvature plane properties of curvature anomalies body zone of interest position;
2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body zone of interest position;
3) according to the maximum curvature plane properties obtained after denoising, set about from the difference between the band response of single river course itself and the response of different single river courses band, identification form river course band, specifically comprises the following steps:
301) close according to the abnormal band feature of single river course band inner curvature, between different single river courses band, curvature anomalies band feature this principle variant carries out the plane subregion of maximum curvature plane properties, obtain curvature anomalies band distributive province, the border of each curvature anomalies band distributive province and band border, corresponding single river course;
302) logging response character analysis is carried out to the abnormal band distributive province of different curvature, by the border of distinguishing mark further identification form river course band, to repair card band border, single river course;
4) inner in the curvature anomalies band distributive province divided, each curvature anomalies band of connecting successively, determine band internal advantages main stream line direction, single river course, advantage main stream line direction is band direction, single river course.
2. a kind of geology river course discriminating direction method based on curvature anomalies band as claimed in claim 1, is characterized in that: described step 2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body zone of interest position, comprise the following steps:
201) first the tomography on curvature anomalies body zone of interest position is identified and explained, and cut the seismic section of curvature anomalies band one by one, then draw a circle to approve the region of faulting;
202) unify assignment to maximum curvature plane properties value in each delineation region, assignment is 0, draws a circle to approve extra-regional maximum curvature plane properties value and remains unchanged;
203) according to the maximum curvature plane properties value after new assignment, re-start the one-tenth figure of maximum curvature plane properties, obtain the maximum curvature plane properties figure after denoising.
3. a kind of geology river course discriminating direction method based on curvature anomalies band as claimed in claim 2, is characterized in that: described step 203) in the plane of maximum curvature plane properties become figure to adopt the makesurface module of petrel software to realize.
4. a kind of geology river course discriminating direction method based on curvature anomalies band as described in claim 1 or 2 or 3, is characterized in that: described step 302) in the distinguishing mark of logging response character analysis comprise difference in thickness, tracing pattern and the distribution range in study area.
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation |