CN117195511A - Quantitative calculation method for initial crust thickness and expansion coefficient - Google Patents
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- 238000005056 compaction Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
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Abstract
In order to solve the problem that the calculation result is inaccurate based on the assumption that the initial crust thickness is a constant value in the calculation of the crust expansion coefficient of the passive land edge or the fractured basin, a new quantitative calculation method for the initial crust thickness and the expansion coefficient is provided, namely, the initial crust thickness and the expansion coefficient are inverted through a uniform limited stretching simulation technology under the constraint of dual data of the current crust thickness and the subsidence period structure subsidence. The method does not assume that the initial crust thickness is a constant value any more, but provides a novel method for jointly inverting the initial crust thickness and the expansion coefficient based on double constraints of the current crust thickness and structural settlement. The new method for calculating the initial crust thickness and the expansion coefficient provided by the invention has important significance for accurately revealing the crust expansion and thinning history, the passive land edge and basin forming process, the hydrocarbon basin sedimentation history, the heat history and the hydrocarbon generation history.
Description
Technical Field
The invention relates to the technical field of crust, in particular to a quantitative calculation method for initial crust thickness and expansion coefficient.
Background
The expansion coefficient is an important parameter for quantifying the expansion and thinning degree of the crust of the passive land margin or the fractured basin, and is also the basic data of sedimentation history, heat history and hydrocarbon generation history calculation in oil gas evaluation. By definition, the stretch factor is the ratio of the thickness of the crust before and after stretching, i.e. the ratio of the initial crust thickness to the present crust thickness. However, since the thickness of the crust before stretching and thinning cannot be obtained by direct measurement, most of practical calculation is performed by assuming that the initial crust thickness is a constant value and then calculating according to definition. However, by analyzing the crust structure in different construction contexts, it is found that the crust thickness has a large variation characteristic in space even in the same construction context, and therefore, calculating the crust expansion coefficient based on the assumed initial crust thickness as a constant value brings a large error to the calculation, makes the result inaccurate, and directly affects the evaluation and understanding of the crust expansion thinning history, the passive land and basin formation process, the hydrocarbon basin sedimentation history, the heat history, and the hydrocarbon generation history.
Disclosure of Invention
In order to solve the problem that the calculation result is inaccurate based on the assumption that the initial crust thickness is a constant value in the calculation of the crust expansion coefficient of the passive land edge or the fractured basin, a novel quantitative calculation method for the initial crust thickness and the expansion coefficient is provided, namely the initial crust thickness and the expansion coefficient are inverted by a uniform finite stretching simulation technology under the constraint of dual data of the current crust thickness and the subsidence period structure settlement
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method for quantitatively calculating initial crust thickness and expansion coefficient, comprising:
s1, establishing an annual stratum grid and a crust structure model in a time domain;
s2, performing paleo-water depth recovery and ablation range definition and ablation stratum recovery to obtain paleo-water depth and ablation stratum thickness;
s3, carrying out deep conversion on the established chronostratigraphic framework and the crust structure model, and solving the thickness of a deposition layer and the thickness of the current crust;
s4, under the control of stratum division, analysis of degraded stratum thickness, lithology, paleo-water depth and sea level, the obtained thickness of the sedimentary deposit is debulked and stripped back, and structural settlement of the actually measured fracture stage is calculated;
s5, giving an initial value to the initial crust thickness, giving an initial strain rate, carrying out uniform limited stretching simulation, calculating structural settlement of a theoretical cracking period, if the error between the structural settlement of the theoretical structure and the structural settlement of an actual cracking period is larger than a given threshold value, gradually adjusting the initial strain rate according to a given step length until the structural settlement of the theoretical structure is calculated to meet the precision, obtaining a rate of change, then solving an expansion coefficient based on the strain rate and the stretching time, and calculating the thickness of the crust after expansion;
s6, comparing the thickness of the crust after stretching and thinning with the thickness of the crust nowadays, and if the difference is smaller than a given threshold value, considering that the initial crust thickness and the stretching coefficient are reasonable; if the difference is greater than the given threshold, the initial crust thickness is required to be continuously adjusted according to the given step length, and the step S5 is repeatedly executed until the error between the crust thickness after the expansion and thinning and the current crust thickness is within a reasonable range, and finally the initial crust thickness and the expansion coefficient of the research area are obtained.
Further, the chronostratigraphic framework and the crustal structure model are established by the following modes:
and carrying out stratum division and interpretation on the two-dimensional and three-dimensional reflection seismic network data under the constraint of drilling and logging data, identifying stratum denudation and earthquake phases, and carrying out full-area tracking on the substrate and the Moholothurian reflection to establish an annual stratum grid and crust structure model.
Further, ancient water depth restoration and ablation range delineation and ablation formation restoration are performed by:
antique depth recovery and ablation range delineation and ablation formation recovery are performed based on drilling lithology, logging interpretation, paleobiology, paleogeography, seismic facies, sedimentary facies data.
Further, the time-depth conversion is carried out on the established chronostratigraphic grid and crust structure model under the control of the well drilling VSP data, the reflection seismic superposition velocity spectrum and the refraction seismic layer velocity material.
Further, the step S3 further includes: the influence of the value of the evaluation speed on the calculation result of the thickness of the earth crust nowadays.
Further, in the step S4, the method further includes: in the back stripping calculation, the influence of lithology, stratum erosion, paleo-water depth and sea level parameters on the result and the errors caused by the influence are fully considered.
Further, in the step S5, the threshold value is 1km.
Further, in the step S6, the threshold value is 0.1km.
Further, in the step S5, an initial crust thickness is given an initial value of 50km.
Further, in the step S5, the initial strain rate is 10 -30 。
Compared with the prior art, the invention has the beneficial effects that:
compared with the prior art, the method does not assume that the initial crust thickness is a constant value, but provides a novel method for jointly inverting the initial crust thickness and the expansion coefficient based on double constraints of the current crust thickness and structural settlement. The new method for calculating the initial crust thickness and the expansion coefficient is not only beneficial to analyzing the historic geography and historic construction background before the land edge and the basin fracture, but also has important significance for accurately revealing the crust expansion and thinning history, the passive land edge and basin formation process, the hydrocarbon basin sedimentation history, the heat history and the hydrocarbon generation history.
Drawings
FIG. 1 is a flow chart of the method for quantitatively calculating initial crust thickness and expansion coefficient provided in example 1 of the present invention;
FIG. 2 is a graph of the thickness of the deposit and the thickness of the crystalline crust today;
FIG. 3 is a structural subsidence of a measured open period of the basin;
FIG. 4 is an initial crust thickness of the investigation region;
fig. 5 shows the expansion coefficients of the study area.
Detailed Description
Examples:
the technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
The passive land edge of the north and south China sea is affected by the diving action before stretching, the volcanic arc structure is widely developed, the space of the crust structure is not uniform, and the specific process of applying the method is illustrated by taking the northeast basin of the land edge of the north and south China sea as an embodiment:
s1, carrying out stratum division and explanation on two-dimensional and three-dimensional reflection seismic network data of the Qionsoutheast basin under the constraint of a large amount of drilling and logging data, identifying stratum ablation phases, tracking the whole area of the substrate and Moholothurian reflection, and establishing basin chronostratigraphic grid and crust structure models in a time domain.
S2, carrying out paleo-water depth recovery, formation ablation range definition and ablation formation thickness recovery according to the drilling lithology, logging interpretation, paleobion, paleogeographic, seismic facies, sedimentary and other data of the Qiongtong basin.
S3, carrying out deep conversion on the Qiondong basin stratum grid and the crust structure under the control of the data such as the well drilling VSP data, the reflection seismic superposition velocity spectrum, the refraction seismic layer velocity and the like, solving the thickness of a deposited layer and the thickness of the current crystalline crust (see figure 2), and evaluating the influence of the velocity value on the calculation result of the current crust thickness.
S4, under the control of parameters such as stratum division, analysis of degraded stratum thickness, lithology, ancient water depth, sea level and the like, the compaction and stripping back are carried out on the deposition layer of the southeast basin, and the structural settlement of the actually measured fracture phase of the basin is calculated (see figure 3).
S5, assigning 50km to the initial crust thickness of the southeast Qiong basin, and giving an initial strain rate of 10 -30 Carrying out uniform limited stretching simulation, calculating structural settlement of a theoretical fracture period, and if the error between the structural settlement of the theoretical structure and the structural settlement of the actual peeling back structure is larger than a given threshold value of 1m, gradually adjusting the initial strain rate according to a given step length until the structural settlement of the theoretical structure meets the precision, and obtaining a rate of change; the expansion coefficient is then solved based on the strain rate and the stretch time, and the thickness of the crust after expansion is calculated.
S6, comparing the thickness of the crust after stretching and thinning with the thickness of the crust nowadays, and if the difference value is smaller than a given threshold value of 0.1km, considering that the initial crust thickness and the stretching coefficient are reasonable; if the difference is greater than the given threshold value of 0.1km, it is necessary to continuously adjust the initial crust thickness by a given step and repeatedly perform step S5 until the error between the stretched thinned crust thickness and the current crust thickness is within a reasonable range, and finally obtain the initial crust thickness of the investigation region (fig. 4) and the stretch coefficient (fig. 5).
It can be seen that the method of the present invention no longer assumes a constant initial crust thickness, but provides a new method for jointly inverting the initial crust thickness and the expansion coefficient based on the double constraints of the current crust thickness and the structural settlement. The new method for calculating the initial crust thickness and the expansion coefficient is not only beneficial to analyzing the historic geography and historic construction background before the land edge and the basin fracture, but also has important significance for accurately revealing the crust expansion and thinning history, the passive land edge and basin formation process, the hydrocarbon basin sedimentation history, the heat history and the hydrocarbon generation history.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for quantitatively calculating an initial crust thickness and expansion coefficient, comprising:
s1, establishing an annual stratum grid and a crust structure model in a time domain;
s2, performing paleo-water depth recovery and ablation range definition and ablation stratum recovery to obtain paleo-water depth and ablation stratum thickness;
s3, carrying out deep conversion on the established chronostratigraphic framework and the crust structure model, and solving the thickness of a deposition layer and the thickness of the current crust;
s4, under the control of stratum division, analysis of degraded stratum thickness, lithology, paleo-water depth and sea level, the obtained thickness of the sedimentary deposit is debulked and stripped back, and structural settlement of the actually measured fracture stage is calculated;
s5, giving an initial value to the initial crust thickness, giving an initial strain rate, carrying out uniform limited stretching simulation, calculating structural settlement of a theoretical cracking period, if the error between the structural settlement of the theoretical structure and the structural settlement of an actual cracking period is larger than a given threshold value, gradually adjusting the initial strain rate according to a given step length until the structural settlement of the theoretical structure is calculated to meet the precision, obtaining a rate of change, then solving an expansion coefficient based on the strain rate and the stretching time, and calculating the thickness of the crust after expansion;
s6, comparing the thickness of the crust after stretching and thinning with the thickness of the crust nowadays, and if the difference is smaller than a given threshold value, considering that the initial crust thickness and the stretching coefficient are reasonable; if the difference is greater than the given threshold, the initial crust thickness is required to be continuously adjusted according to the given step length, and the step S5 is repeatedly executed until the error between the crust thickness after the expansion and thinning and the current crust thickness is within a reasonable range, and finally the initial crust thickness and the expansion coefficient of the research area are obtained.
2. The method for quantitative calculation of initial crust thickness and expansion coefficient according to claim 1, wherein the chronostratigraphic framework and crust structure model are established by:
and carrying out stratum division and interpretation on the two-dimensional and three-dimensional reflection seismic network data under the constraint of drilling and logging data, identifying stratum denudation and earthquake phases, and carrying out full-area tracking on the substrate and the Moholothurian reflection to establish an annual stratum grid and crust structure model.
3. The method of initial crust thickness and expansion coefficient quantitative calculation according to claim 1, wherein the paleo-water depth restoration and ablation range delineation and the ablated formation restoration are carried out by:
antique depth recovery and ablation range delineation and ablation formation recovery are performed based on drilling lithology, logging interpretation, paleobiology, paleogeography, seismic facies, sedimentary facies data.
4. The method of claim 1, wherein the time-to-depth conversion is performed by performing a time-to-depth conversion on the established chronostratigraphic grid and crust structural model under control of the borehole VSP data, the reflected seismic stack velocity spectrum, and the refracted seismic layer velocity profile.
5. The method for quantitatively calculating the initial crust thickness and expansion coefficient according to claim 1, further comprising, in said step S3: the influence of the value of the evaluation speed on the calculation result of the thickness of the earth crust nowadays.
6. The method for quantitatively calculating the initial crust thickness and expansion coefficient according to claim 1, further comprising, in said step S4: in the back stripping calculation, the influence of lithology, stratum erosion, paleo-water depth and sea level parameters on the result and the errors caused by the influence are fully considered.
7. The method for quantitative calculation of initial crust thickness and expansion coefficient according to claim 1, wherein in said step S5, said threshold value is 1km.
8. The method for quantitative calculation of initial crust thickness and expansion coefficient according to claim 1, wherein in said step S6, said threshold value is 0.1km.
9. The method for quantitatively calculating the initial crust thickness and the expansion coefficient according to claim 1, wherein in the step S5, the initial crust thickness is given an initial value of 50km.
10. The method for quantitative calculation of initial crust thickness and expansion coefficient according to claim 1 or 9, wherein in said step S5, said initial strain rate is 10 -30 。
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