CN105116447B - A kind of geology river course discriminating direction method based on curvature anomalies band - Google Patents

A kind of geology river course discriminating direction method based on curvature anomalies band Download PDF

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CN105116447B
CN105116447B CN201510500944.XA CN201510500944A CN105116447B CN 105116447 B CN105116447 B CN 105116447B CN 201510500944 A CN201510500944 A CN 201510500944A CN 105116447 B CN105116447 B CN 105116447B
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curvature
band
anomalies
river course
plane properties
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CN105116447A (en
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宋来明
范廷恩
胡光义
王晖
梁旭
王宗俊
张晶玉
马淑芳
井涌泉
肖大坤
刘向南
王海峰
解超
王帅
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China National Offshore Oil Corp CNOOC
CNOOC Research Institute Co Ltd
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CNOOC Research Institute Co Ltd
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Abstract

The present invention relates to 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 waveform in original seismic data, obtains curvature anomalies body, and maximum curvature plane properties extraction is carried out to curvature anomalies body purpose of horizon, obtain the maximum curvature plane properties of curvature anomalies body purpose of horizon;2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body purpose of horizon;3) according to the maximum curvature plane properties obtained after denoising, the single river course band of identification, including:301) the plane subregion of maximum curvature plane properties is carried out, curvature anomalies band distributed area is obtained, each curvature anomalies band distributed area is the border of single river course band;302) logging response character analysis is carried out to the abnormal band distributed area of different curvature, to correct single river course band border;4) inside each curvature anomalies band distributed area, each curvature anomalies band is sequentially connected in series, it is determined that single river course internal advantages main stream line direction.

Description

A kind of geology river course discriminating direction method based on curvature anomalies band
Technical field
The present invention relates to exploratory engineering of off-shore petroleum/gas reservoir exploitation geological technique field, curvature anomalies band is based on especially with regard to one kind Geology river course discriminating direction method.
Background technology
Complicated fluvial facies oil reservoir based on meandering stream deposit reservoir occupies critical role in China's developed field, should Class reservoir is faced with that flooding pattern imperfection, waterflooding effect are undesirable, reserves exploitation degree is low in waterflooding extraction, adjustment well portion The problems such as difficulty is big is affixed one's name to, Geological Reasons of searching to the bottom still recognize unclear for river channel sand spreading direction.Onshore oil field Mi Jing The net of research under the conditions of to(for) river channel sand is highly developed, perfect to have developed configuration fine dissection technology and theory, Research precision can be goed deep into point bar private side lamination level.Under conditions of 50m or so dense well spacings, aid in horizontal well, core hole, The data such as Production development, can accurately judge river course spreading direction, even for river course inside by being contrasted between fine well Dominant flowing path under the influence of the lamination of side can also be judged.
Marine fluvial depositional reservoir exploitation is far different with onshore oil field, is limited by platform size and development cost limits to be formed The characteristics of wide spacing, wide spacing, therefore land theory and method based on well is difficult popularization and application, is more by height The earthquake information of the precision attribute different by exploring realizes the prediction for river course spreading direction.But connect for side stacked Sheet sand body, sand body plane all directions are moniliform distribution feature so that the attribute of conventional reflection sand thickness change It is difficult to effectively judge river course spreading direction, scientific research personnel has also done substantial amounts of research work for this, to ensure result of determination Authenticity and reasonability, but due to Research Thinking and Geological Mode it is cognitive the problem of, there is no larger progress all the time.
The content of the invention
In view of the above-mentioned problems, the purpose of the present invention is to provide a kind of geology based on curvature anomalies band for offshore oilfield River course discriminating direction method, can accurately judge side stacked sand body inside river course direction in flakes.
To achieve the above object, the present invention takes following technical scheme:A kind of geology river course based on curvature anomalies band Discriminating direction method, comprises the following steps:1) curvature estimation is carried out to the seismic waveform in the original seismic data in oil field, obtained The curvature anomalies body of original seismic data, and maximum curvature plane properties extraction is carried out to curvature anomalies body purpose of horizon, obtain The maximum curvature plane properties of curvature anomalies body purpose of horizon;2) to the maximum curvature plane properties of curvature anomalies body purpose of horizon Carry out denoising;3) it is in itself and different from single river course band response according to the maximum curvature plane properties obtained after denoising Difference between single river course band response is set about, the single river course band of identification, specifically includes following steps:301) inside according to single river course band Curvature anomalies band feature is close, and this variant principle of curvature anomalies band feature carries out most Daqu between different list river courses band The plane subregion of rate plane properties, obtains curvature anomalies band distributed area, and the border in each curvature anomalies band distributed area is Correspondence list river course band border;302) logging response character analysis is carried out to the abnormal band distributed area of different curvature, marked by recognizing Will further recognizes the border of single river course band, to correct single river course band border;4) in the curvature anomalies band distributed area of division Portion, is sequentially connected in series each curvature anomalies band, it is determined that single river course band internal advantages main stream line direction, advantage main stream line direction is list River course band direction.
The step 2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body purpose of horizon, including it is following Step:201) tomography in curvature anomalies body purpose of horizon is identified and explained first, and cut curvature anomalies one by one The seismic profile of band, then draws a circle to approve the region of faulting;202) to maximum curvature plane properties value in each delineation region Unified assignment is carried out, the maximum curvature plane properties value being entered as outside 0, delineation region keeps constant;203) after according to new assignment Maximum curvature plane properties value, re-start maximum curvature plane properties into figure, obtain the maximum curvature plane after denoising Attributed graph.
The step 203) in maximum curvature plane properties plane into figure using petrel softwares make surface Module is realized.
The step 302) in logging response character analyze distinguishing mark include difference in thickness, tracing pattern and research The distribution in area.
The present invention is due to taking above technical scheme, and it has advantages below:1st, the present invention passes through original seismic data meter Curvature anomalies body is calculated, and extracts non-uniform Distribution in the maximum curvature plane properties of curvature anomalies body purpose of horizon, attributed graph Linear delineation region is referred to as curvature anomalies band, because the different single river course bands in the stacked inside of sand body in flakes are in curvature anomalies band All difference, therefore most Daqu is at sea combined under conditions of wide spacing, wide spacing in plane distribution and logging response character The rate plane properties mean curvature exception Distribution Pattern of band, the tracing pattern of each well point and characteristics of combination spatially, can be with The comprehensive single river course band of identification, overcomes the difficulty of offshore oilfield wide spacing, wide spacing, improves in side stacked in flakes sand body The cognition degree in portion list river course direction, for the deployment of oil field development flooding pattern, Tapping Residual Oil provides strong support.2、 The present invention effectively make use of marine high-precision earthquake by the introducing and the deciphering of corresponding Geological Mode of curvature anomalies band Data, and it is workable, for geology experiences, not enough physical prospecting personnel can also quickly grasp;3rd, the present invention focuses on from Dan He Road band is in itself and the difference between different single river course bands is set about, and utilizes the abnormal band distribution of maximum curvature plane properties mean curvature Difference carries out plane subregion and single river course logging response character correction analysis two-step method itself determines single river course band border, therefore not It is same as determining to rely on transition of single river course with border distinguishing mark during single river course band under the conditions of dense well pattern.4th, the present invention is not only fitted For meandering stream type river channel sand, it can also be applied among distributary channel molding sand body.The present invention can be widely applied to sea River channel type is in flakes in the exploitation of sand body under the conditions of the wide spacing of oil field.
Brief description of the drawings
Fig. 1 is that mean curvature anomalous body maximum curvature of embodiment of the present invention plane properties are extracted and the delineation of faulting region is shown It is intended to, wherein, arrow meaning region is the region that maximum curvature plane properties are disturbed by faulting;
Fig. 2 is the maximum curvature plane properties figure after denoising in the embodiment of the present invention, wherein, the line of non-uniform Distribution Property delineation region be referred to as curvature anomalies band;
Fig. 3 is the plane point of curvature anomalies band on maximum curvature plane properties in the embodiment of the present invention after denoising Qu Tu;
Fig. 4 is river course pattern classification synthesis identification schematic diagram in the embodiment of the present invention;
Fig. 5 is different type river course flat distribution map in the embodiment of the present invention;
Fig. 6 is single river course band border schematic diagram after correcting in the embodiment of the present invention, wherein, "+" represents to study area's well location,Amendment Hou① areas border is represented,Amendment Hou② areas border is represented,Represent after amendment 3. area border;
Fig. 7 is river course advantage main stream line schematic diagram in the embodiment of the present invention, wherein, "+" represents to study area's well location,Amendment Hou① areas border is represented,Amendment Hou② areas border is represented,Represent after amendment 3. area border,Represent river course advantage main stream line.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
The geology river course discriminating direction method based on curvature anomalies band that the present invention is provided, comprises the following steps:
1) curvature estimation is carried out to the seismic waveform in the original seismic data in oil field using existing computational methods, obtained The curvature anomalies body of original seismic data, curvature anomalies body refers to data of the seismic waveform curvature in the change of three dimensions Body, and maximum curvature plane properties extraction is carried out to curvature anomalies body purpose of horizon using existing method, obtain curvature anomalies The maximum curvature plane properties of body purpose of horizon;
2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body purpose of horizon, denoising refers to pass through Analysis eliminates the curvature anomalies band that maximum curvature plane properties interrupting layer interference effect is produced, and retains river channel sand sedimentary origin Curvature anomalies band, sedimentary origin mainly includes that sand body is stacked or horizontal pinching, wherein, denoising comprises the following steps:
201) tomography in curvature anomalies body purpose of horizon is identified by the way of existing flat cutting is interactive first And explanation, and the seismic profile of curvature anomalies band was cut one by one, then draw a circle to approve the region of faulting;
202) unified assignment is carried out to maximum curvature plane properties value in each delineation region, is entered as outside 0, delineation region Maximum curvature plane properties value keep it is constant;
203) according to the maximum curvature plane properties value after new assignment, re-start maximum curvature plane properties into figure, The maximum curvature plane properties figure after denoising is obtained, wherein, maximum curvature plane properties into figure can use petrel softwares Make surface modules realize.
3) according to the maximum curvature plane properties obtained after denoising, from single river course band response in itself and different single river course Set about with the difference between response, the single river course band of identification specifically includes following steps:
301) it is close according to single abnormal band feature of river course band inner curvature, curvature anomalies band between different list river courses band Variant this principle of feature carries out the plane subregion of maximum curvature plane properties, and then obtains curvature anomalies band block plan, The border of each curvature anomalies ribbon area is the border of single river course band;
302) logging response character analysis is carried out to the abnormal band distributed area of different curvature, further known by distinguishing mark The border of not single river course band, to correct single river course band border, wherein, the distinguishing mark of logging response character analysis includes:
A, difference in thickness:Due to the difference that different river course shaping age hydrodynamic conditions and material resource are supplied, in sand thickness Difference necessarily occurs, therefore can be distinguished according to the total sand thickness of combination channel, average sand thickness and single phase sand thickness Different list river channel sands;
B, tracing pattern:Different channel deposits cause the difference on log response characteristics because of the difference of prop-carrying capacity, From the perspective of statistics, the similar probability of same river channel sand tracing pattern is significantly larger than different river channel sand tracing patterns Difference;
C, the distribution in research area:According to the principle of the identical origin cause of formation in similar river course, determine that different type river course is being ground Study carefully area's proportion and plane distributing scope;
Integrated really by studying the difference in thickness on area's log, tracing pattern difference, the distribution in research area The border of order river course band.
4) inside each curvature anomalies band distributed area of division, each curvature anomalies band is sequentially connected in series, it is determined that single river Road band internal advantages main stream line direction, the sedimentary evolution in river course is a mistake swung along with the continuous lateral migration of flood event Journey, but can be fixed within a certain range in a certain fixed time period single river channel band, main stream line also can relative advantage concentrate on the model Enclose, therefore advantage main stream line direction is single river course band direction, so far completes river course direction determining.
Embodiment:
Q oil fields are located in the middle part of Bohai Offshore, are a Large River phase sandstone viscous crude fields, main oil-bearing series is recently Xi Minghua towns group hypomere and Guantao group, wherein, Ming Hua towns group hypomere can be divided into Nm0, Nm I, Nm II, Nm III, Nm IV and Nm V Totally 6 oily groups.Reservoir is based on positive rhythm and compound rhythm meander river course sedimentary sand bodies.Forefathers are according to configuration characteristic, by the ground Qu Mingization town group fluvial sandstone is divided into stacked, side stack-type and the type of stand alone 3.For side stack-type sand body, most significantly Feature is exactly that channel migration swing ability is relatively strong, in the horizontal the migration with certain orientation, and river channel sand is laterally taken Connect, aggregate performance is that shape is distributed sand body in flakes, and reflection line-ups are connected on seismic profile, but unconspicuous flexure is presented in waveform (being not turned off).For this region, geology river course discriminating direction is carried out using the present invention and comprised the following steps:
1) calculated on the basis of the original seismic data in Q oil fields, obtain the curvature anomalies body of original seismic data, And maximum curvature plane properties extraction is carried out for curvature anomalies body purpose of horizon, obtain the maximum of curvature anomalies body purpose of horizon Curvature plane properties;
Curvature is a kind of two dimensional character of curve from the principle, and it describes the degree of crook that certain is put on curve, for The amplitude of waveform, the various variations in detail responses such as form are obvious, therefore curvature attributes can be very good reflection tomography, sedimentary sand bodies The feature on stacked border.
2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body purpose of horizon, concretely comprised the following steps:
201) tomography in curvature anomalies body purpose of horizon is identified and explained by the way of flat cutting is interactive first (earthquake speciality personnel grasp), and the seismic profile of curvature anomalies band was cut one by one, then draw a circle to approve the area of faulting Domain (as shown in Figure 1);
202) unified assignment is carried out to maximum curvature plane properties value in each delineation region, is entered as outside 0, delineation region Maximum curvature plane properties value keep it is constant;
203) according to the maximum curvature plane properties value after new assignment, re-start maximum curvature plane properties into figure, 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, from single river course band response in itself and different single river course Set about with the difference between response, the single river course band of identification specifically includes following steps:
301) the plane subregion of maximum curvature plane properties is carried out, curvature anomalies band distributed area, each curvature is obtained The border in abnormal band distributed area is the single river course band border of correspondence;
The sand body in flakes of distribution is laterally spliced by a plurality of river course in certain limit on Plain, but different times Single river course material resource supply whether sufficient, hydrodynamic intensity can cause the difference inside the type of river, be embodied in maximum curvature plane It is then the regular change of curvature anomalies band on attribute, as shown in Figure 3, it can be seen that three curvature anomalies band distributions Area, 1. area, 2. area and 3. between area curvature anomalies band from quantity, distribution density degree, transverse and longitudinal extension and arrangement There is very big difference in regularity, 1. curvature anomalies bin number in area's is more, densely distributed, and transverse and longitudinal extension length, NW trending Align regular obvious;2. curvature anomalies bin number in area's is few, and distribution is sparse, and transverse and longitudinal expanded range is short, and NW trending is fixed It is more obvious to arrangement regulation;3. area's curvature anomalies bin number Shang compare ① areas are few, many compared with 2. area, and distribution is intensive compared with 2. area, But NW trending aligns feature and may be seen indistinctly.
302) logging response character analysis is carried out to the abnormal band distributed area of different curvature, further known by distinguishing mark The border of not single river course band, to correct single river course band border, detailed process is:
First, different river channel sands are identified according to individual well log response characteristics, wherein, the natural electricity of river channel sand Position (SP, spontaneous potential) and gamma (GR, natural gamma ray) log show as box or Bell;Then, further each type is divided in difference in thickness, tracing pattern, in the distribution in research area in detail Analysis;Finally, the corresponding river pattern of every mouthful of well is projected in research area, and corrects and improve step 301) single river course band knot Really.As shown in figure 4, specific distinguishing mark is as follows:A, difference in thickness;B, tracing pattern difference;C, the distribution model in research area Enclose;As shown in figure 5, wherein, D, M, S represent different types of river course respectively, different types of river course is in the spy that East and West direction is distributed Levy.
By studying the difference in thickness on area's log response characteristics, tracing pattern difference, the distribution model in research area The border (as shown in Figure 6) for determining single river course band can be integrated by enclosing.
4) in step 301) inside obtained curvature anomalies band distributed area, each curvature anomalies band is sequentially connected in series, so far Complete river course direction determining (as shown in Figure 7).
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each part, connected mode and manufacture craft etc. are all It can be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement should not be excluded Outside protection scope of the present invention.

Claims (4)

1. a kind of geology river course discriminating direction method based on curvature anomalies band, comprises the following steps:
1) curvature estimation is carried out to the seismic waveform in the original seismic data in oil field, obtains the curvature anomalies of original seismic data Body, and maximum curvature plane properties extraction is carried out to curvature anomalies body purpose of horizon, obtain curvature anomalies body purpose of horizon most Deep camber plane properties;
2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body purpose of horizon;
3) according to the maximum curvature plane properties obtained after denoising, from single river course band response in itself and different single river courses band rings Difference between answering is set about, the single river course band of identification, specifically includes following steps:
301) it is close according to single abnormal band feature of river course band inner curvature, curvature anomalies band feature between different list river courses band This variant principle carries out the plane subregion of maximum curvature plane properties, obtains curvature anomalies band distributed area, and each is bent The border in rate exception band distributed area is the single river course band border of correspondence;
302) logging response character analysis is carried out to the abnormal band distributed area of different curvature, list is further recognized by distinguishing mark The border of river course band, to correct single river course band border;
4) inside the curvature anomalies band distributed area of division, each curvature anomalies band is sequentially connected in series, it is determined that inside single river course band Advantage main stream line direction, advantage main stream line direction is single river course band direction.
2. a kind of geology river course discriminating direction method based on curvature anomalies band as claimed in claim 1, it is characterised in that: The step 2) denoising is carried out to the maximum curvature plane properties of curvature anomalies body purpose of horizon, comprise the following steps:
201) tomography in curvature anomalies body purpose of horizon is identified and explained first, and cut curvature anomalies bar one by one The seismic profile of band, then draws a circle to approve the region of faulting;
202) unified assignment is carried out to maximum curvature plane properties value in each delineation region, is entered as outside 0, delineation region most Deep camber plane properties value keeps constant;
203) according to the maximum curvature plane properties value after new assignment, re-start maximum curvature plane properties into figure, obtain 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, it is characterised in that: The step 203) in maximum curvature plane properties plane into figure using petrel softwares make surface modules 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, it is special Levy and be:The step 302) in logging response character analyze distinguishing mark include difference in thickness, tracing pattern and research The distribution in area.
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