CN112068201B - Exploration method for ancient ridge edge unconformity V-belt - Google Patents
Exploration method for ancient ridge edge unconformity V-belt Download PDFInfo
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- CN112068201B CN112068201B CN202011049215.4A CN202011049215A CN112068201B CN 112068201 B CN112068201 B CN 112068201B CN 202011049215 A CN202011049215 A CN 202011049215A CN 112068201 B CN112068201 B CN 112068201B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
- G01V1/30—Analysis
- G01V1/306—Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/62—Physical property of subsurface
- G01V2210/624—Reservoir parameters
Abstract
The invention belongs to the technical field of oil exploration, and provides an exploration method of an ancient ridge edge unconformity V-belt, which comprises the following steps of determining an unconformity interface on a seismic section; step two, flattening the unconformity interface; and step three, identifying a next-level ablation unconformity interface on the flattened seismic section, identifying a wedge-shaped stratum structure formed by ablation of the ablation unconformity interface on the underlying stratum, and determining an ablation unconformity triangular belt. The ablation unconformity triangular belt is an unconformity trapping favorable zone, the unconformity triangular belt has important significance in the aspect of distribution prediction of oil gas trapping, the implementation of the method is beneficial to recovering multi-stage ancient heaves and stratum structure patterns caused by the ancient heaves, and the method has important significance in the aspects of basin structure change, ancient heaves change and the like.
Description
Technical Field
The invention relates to the field of oil exploration, in particular to an exploration method of an ancient ridge edge unconformity V-belt.
Background
In a large basin with a construction activity, because a series of unconformities are formed by multi-stage structural changes, the multi-stage structural changes are superposed and compounded to form a complex stratum structure, and an analytic technology is still lacked at present aiming at the stratum structure characteristics of the basin.
In the paleo-ridge zone, multiple stages of ablation often lead to the compounding of multiple unconformities to form an unconformity laminated zone, which represents the area of the multi-stage tectonic upheaval ablation and can reflect the distribution and the transition of the paleo-ridge. The ablation unconformity triangle belt and the upper unconformity triangle belt can be identified on the paleo-ridge edge slope. And oil and gas exploration shows that wedge-shaped cutting erosion unconformity and upper unconformity triangular belts are favorable zones for forming large oil and gas traps, and the detection of the distribution range of the unconformity triangular belts has important significance for reconstructing ancient raised landforms and predicting the distribution of stratum trap oil and gas reservoirs.
Disclosure of Invention
In order to solve the technical problems, the invention provides the exploration method of the ancient humped edge unconformity V-belt, which is beneficial to recovering the multi-stage ancient humps and stratum structures of large superposed or complex basins undergoing multi-stage structural changes and has important significance in the aspects of researching basin structural changes, ancient hump changes and the like.
The invention provides a method for exploring an ancient ridge edge unconformity V-belt, which specifically comprises the following steps:
step one, determining an unconformity interface on a seismic section;
leveling the non-integration interface and the integration surface, wherein the integration surface corresponds to the non-integration interface;
and thirdly, identifying a secondary ablation unconformity interface on the seismic section of the leveled unconformity interface and the corresponding integration surface, identifying a wedge-shaped stratum structure formed by ablation of the ablation unconformity interface on the underlying stratum, and determining an ablation unconformity triangular belt.
Preferably, the determining of the unconformity interface on the seismic section specifically includes:
and determining an unconformity interface on the seismic section by identifying the angle unconformity contact relation, and calibrating the well drilling and the seismic section.
Preferably, the determining the unconformity interface by identifying the angle unconformity contact relationship on the seismic section specifically includes:
judging whether the stratum is missing or whether the sedimentary facies is mutated or not according to the drilling information; and when the stratum is missing or the sedimentary facies is mutated, confirming the position of the non-integrated interface on the seismic profile through the calibration of the well drilling and the seismic profile.
Preferably, after step three, the method of the present invention further comprises:
identifying a plurality of regions of said non-integral interfacial lamination, i.e. non-integral lamination bands.
Preferably, after step three, the method of the present invention further comprises:
identifying a wedge-shaped stratum structure formed by the ablation of the ablation unconformity interface on the underlying stratum; determining an initial ablation point of the ablation unconformity surface, wherein the initial ablation point is a starting point from a stratum parallel structure to the thinning of the stratum caused by the occurrence of ablation; and tracking the initial ablation point, and determining a boundary line between a distribution area of the ablation unconformity triangular belt and the integration surface.
Preferably, the method further comprises:
extending the attitude of the initial ablation points on two sides of the ablation unconformity interface to be intersected on a seismic section of the leveling unconformity interface and the corresponding integration surface, and determining the form of the ablated stratum according to the stratum bending trend;
and measuring the denudation amount of the denudation of the stratum according to the determined form of the denudation stratum and the restored form of the stratum.
Preferably, the method further comprises:
tracking an upper over point of a deposition layer above the ablation unconformity interface along the ablation unconformity interface on a seismic section of the leveling unconformity interface and the corresponding integration surface;
and determining the upper unconformity triangular belt of the ablation unconformity interface according to the upper overtemperature.
Has the advantages that:
the method comprises the steps of determining an unconformity interface on a seismic section, then leveling the unconformity interface, identifying a secondary ablation unconformity interface on the seismic section with the leveled unconformity interface and a corresponding integration surface, and identifying a wedge-shaped stratum structure formed by ablation of the ablation unconformity interface on an underlying stratum so as to determine an ablation unconformity triangular belt, wherein the unconformity triangular belt represents a slope belt of the paleodome, and the ablation unconformity triangular belt is also an unconformity trap favorable zone.
Drawings
1. FIG. 1 is a schematic flow chart of a method for exploring a paleo-ridge edge unconformity vee belt according to an embodiment of the present invention;
2. FIG. 2 is a schematic flow chart of another method for exploring a paleo-ridge edge unconformity vee belt according to an embodiment of the present invention;
3. FIG. 3 is a schematic structural distribution diagram of a raised ancient edge non-integrated V-belt according to an embodiment of the present invention;
4. fig. 4 is a schematic structural distribution diagram of the morphology recovery of a degraded formation according to an embodiment of the present invention.
Best mode for carrying out the invention
In order to make the high-precision flow calibration device provided by the present invention more clearly understood, the detailed description will be made below with reference to the accompanying drawings.
As shown in FIG. 1, the invention provides a method for exploring a paleo-ridge edge unconformity triangle belt, which specifically comprises the following steps:
S1determining an unconformity interface on the seismic section;
preferably, step S1The method can also comprise the following steps:
S11and determining an unconformity interface on the seismic section by identifying the angle unconformity contact relation, and calibrating the well drilling and the seismic section.
S2Leveling the non-integration interface and the corresponding integration surface, wherein the integration surface corresponds to the non-integration interface;
S3identifying a next-level ablation unconformity interface on the seismic section which levels the unconformity interface and the corresponding integration surface thereof, and dividing a plurality of areas in which the unconformity interfaces are overlapped, namely an unconformity overlapped band; and identifying a wedge-shaped stratum structure formed by the ablation of the ablation unconformity interface on the underlying stratum, and determining an ablation unconformity triangular belt.
Determining an unconformity interface on a seismic section, leveling the unconformity interface, identifying a secondary ablation unconformity interface on the seismic section of the leveled unconformity interface and a corresponding integration surface, and determining an ablation unconformity triangular belt by identifying a wedge-shaped stratum structure formed by ablation of the ablation unconformity interface on an underlying stratum, wherein the ablation unconformity triangular belt represents a slope belt of an ancient hump, and the ablation unconformity triangular belt is also an unconformity trap favorable zone, has important significance in the distribution prediction aspect of oil and gas traps, is beneficial to recovering the multi-stage ancient hump and the caused stratum structure pattern, and has important significance in the aspects of basin structure change, ancient hump transition and the like.
As shown in fig. 2 and 3, a method for exploring a paleo-ridge edge unconformity vee belt specifically comprises the following steps:
S1determining an unconformity interface on the seismic section;
preferably, step S1The method can comprise the following steps:
S11and determining an unconformity interface on the seismic section by identifying the angle unconformity contact relation, and calibrating the well drilling and the seismic section.
Preferably, step S1The method can also comprise the following steps:
S12firstly, judging whether the stratum is lost and whether the sedimentary facies is mutated or not according to well drilling information;
if stratum loss or sedimentary facies mutation is judged, determining the position of an unconformity interface on the seismic profile through the calibration of the well drilling and the seismic profile;
S2leveling the non-integration interface and the corresponding integration surface, wherein the integration surface corresponds to the non-integration interface;
and flattening the non-integrated interface and the corresponding integrated surface to restore the stratum structure.
S3Identifying a next-level ablation unconformity interface on the seismic section which levels the unconformity interface and the corresponding integration surface thereof, and dividing a plurality of areas in which the unconformity interfaces are overlapped, namely an unconformity overlapped band; identifying a wedge-shaped stratum structure formed by cutting and etching the underlying stratum by the cutting and etching unconformity interface, and determining a cutting and etching unconformity triangular belt;
in step S3Thereafter, the method further comprises:
S4identifying a plurality of areas where the non-integrated interfaces are integrated, namely non-integrated laminated belts;
the non-integrated superimposed band represents an area subject to degradation during the rise of the multi-stage paleoplastic bulge, and the identification of the non-integrated superimposed band is advantageous for recovering the distribution and transition of the paleoplastic bulge.
Preferably, the method further comprises:
S5identifying a wedge-shaped stratum structure formed by cutting and eroding the underlying stratum by the cutting and eroding unconformity interface, and determining an initial cutting and eroding point of the cutting and eroding unconformity interface, wherein the initial cutting and eroding point is a starting point from a stratum parallel structure to the thinning of the stratum caused by the occurrence of cutting and eroding; tracking the initial ablation point, and determining a boundary line between a distribution area of the ablation unconformity triangular belt and the integration surface;
and tracking the initial ablation point, and determining a boundary line between the distribution area of the ablation unconformity triangular belt and the integration surface, so that the exploration of the distribution area of the ablation unconformity triangular belt is more accurate.
Preferably, the method further comprises:
S6extending the attitude of the initial ablation points on two sides of the ablation unconformity interface to intersect on the seismic section of the leveling unconformity interface and the corresponding integration surface, and determining the form of the ablated stratum according to the stratum bending trend;
S7measuring the denudation amount of the denudation of the stratum according to the determined form of the denudation stratum and the restored form of the stratum;
specifically, as shown in fig. 4, a structural distribution diagram of the degraded formation morphology recovery.
Extending the attitude of the initial ablation points on two sides of the unconformity surface to be intersected on a seismic section of the leveling unconformity interface and the corresponding integration surface, and determining the form of the degraded stratum according to the stratum bending trend;
and measuring the size of the denudation amount of the denudation of the stratum according to the determined form of the denudation stratum and the recovered form of the stratum, so that the exploration accuracy of the form of the denudation stratum can be improved, and the exploration of the unconformity zone distribution area is facilitated. Wherein the attitude of the initial ablation points on both sides of the unconformity extends to the intersection to restore the morphology of the degraded formation.
Preferably, the method further comprises:
S8tracking an upper over point of a deposition layer above the ablation unconformity interface along the ablation unconformity interface on a seismic section of the leveling unconformity interface and the corresponding integration surface;
S9and determining the upper unconformity triangular belt of the ablation unconformity interface according to the upper overflow point.
Wherein, the distribution area of the upper unconformity triangle belt represents the upper super area and the slope area of the stratum formed when the paleoplastic bulge is formed and then the sedimentation is carried out again.
The upper unconformity triangular belt is a favorable prediction area of the stratigraphic trap formed by the upward inclination and pinch-out of the lithologic stratigraphic, the research and exploration on the distribution of the upper unconformity triangular belt are favorable for the distribution prediction of the oil-gas trap, and simultaneously, the upper unconformity triangular belt is favorable for recovering the multi-stage paleodome and the caused stratigraphic structure style, and researching basin structure change, paleodome change and the like.
The foregoing detailed description of the embodiments of the present invention has been presented for the purpose of illustrating the principles and implementations of the present invention, and the description of the embodiments is only provided to assist understanding of the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. A method of exploring for a paleo-ridge edge unconformity vee belt, comprising:
step one, determining an unconformity interface on a seismic section;
leveling the non-integration interface and the integration surface, wherein the integration surface corresponds to the non-integration interface;
identifying a secondary cutting and eroding unconformity interface on the seismic section of the leveling unconformity interface and the corresponding integration surface, identifying a wedge-shaped stratum structure formed by cutting and eroding the lower overburden stratum by the cutting and eroding unconformity interface, and determining a cutting and eroding unconformity triangular belt;
determining an initial ablation point of the ablation unconformity surface, wherein the initial ablation point is a starting point from a stratum parallel structure to the formation thinning caused by the occurrence of ablation; tracking the initial ablation point, and determining a boundary line between a distribution area of the ablation unconformity triangular belt and the integration surface;
extending the initial ablation points on two sides of the ablation unconformity interface to intersect on the seismic section of the leveling unconformity interface and the corresponding integration surface, and determining the form of the ablated stratum according to the stratum bending trend; and measuring the denudation amount of the denudation of the stratum according to the determined form of the denudation stratum and the restored form of the stratum.
2. The method for exploring a paleo-ridge edge unconformity v belt as claimed in claim 1, wherein the determining the unconformity interface on the seismic section comprises:
and determining an unconformity interface on the seismic section by identifying the angle unconformity contact relation, and calibrating the well drilling and the seismic section.
3. The method of claim 1, wherein determining the unconformity interface on the seismic section by identifying an angular unconformity contact relationship comprises:
judging whether the stratum is missing or whether the sedimentary facies is mutated or not according to the drilling information; and when the stratum is missing or the sedimentary facies is mutated, confirming the position of the non-integrated interface on the seismic profile through the calibration of the well drilling and the seismic profile.
4. A method for exploring a paleo-ridge edge-unconformity vee belt as claimed in claim 2 or claim 3, further comprising, after step three:
identifying a plurality of regions of said non-integral interfacial lamination, i.e. non-integral lamination bands.
5. A method of exploring for a raised ancient edge unconformity v-belt as defined in claim 3, further comprising:
tracking an upper over point of a deposition layer above the ablation unconformity interface along the ablation unconformity interface on a seismic section of the leveling unconformity interface and the corresponding integration surface;
and determining the upper unconformity triangular belt of the ablation unconformity interface according to the upper overtemperature.
6. The method of exploring for a paleo-ridge edge-unconformity vee belt of claim 4, further comprising:
tracking an upper over point of a deposition layer above the ablation unconformity interface along the ablation unconformity interface on a seismic section of the leveling unconformity interface and the corresponding integration surface;
and determining the upper unconformity triangular belt of the ablation unconformity interface according to the upper overtemperature.
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| CN202011049215.4A CN112068201B (en) | 2020-09-29 | 2020-09-29 | Exploration method for ancient ridge edge unconformity V-belt |
| AU2020103046A AU2020103046A4 (en) | 2020-09-29 | 2020-10-27 | Exploration method for unconformity triangle belt surrounding a palaeohigh |
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| CN202011049215.4A CN112068201B (en) | 2020-09-29 | 2020-09-29 | Exploration method for ancient ridge edge unconformity V-belt |
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- 2020-09-29 CN CN202011049215.4A patent/CN112068201B/en active Active
- 2020-10-27 AU AU2020103046A patent/AU2020103046A4/en active Active
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