CN106019401A - Quantitative recovery method and apparatus for paleo-water depth - Google Patents

Quantitative recovery method and apparatus for paleo-water depth Download PDF

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CN106019401A
CN106019401A CN201610298524.2A CN201610298524A CN106019401A CN 106019401 A CN106019401 A CN 106019401A CN 201610298524 A CN201610298524 A CN 201610298524A CN 106019401 A CN106019401 A CN 106019401A
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paleao
water depth
dam
well
point
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CN106019401B (en
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高艺
姜在兴
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China University of Geosciences Beijing
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China University of Geosciences Beijing
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Abstract

The invention relates to the technical field of paleoenvironment recovery, and specifically relates to a quantitative recovery method and apparatus for a paleo-water depth. The method comprises the following steps: determining a beach and dam development region in a research layer of a paleo lake basin; determining a single-point paleo-water depth of at least one typical well in the beach and dam development region; determining a Th content and a U content in the at least one typical well in the beach and dam development region, and according to the Th content and the U content, calculating a ratio of the Th to the U; according to the single-point paleo-water depths of all the typical wells and the Th/U ratio corresponding to positions of the single-point paleo-water depths, fitting a relation equation between the single-point paleo-water depths and the Th/U value, and recovering quantitative paleo-water depths of the typical wells; and according to the relation equation between the single-point paleo-water depths and the Th/U value, recovering quantitative paleo-water depths of other wells in a non-beach-dam development region in the paleo lake basin. Through the method, continuous quantitative paleo-water depth data of water body depth vertical and planar change of the paleo lake basin in the same deposition period can be obtained.

Description

A kind of quantitative reconstruction method of paleao-water depth and device
Technical field
The present invention relates to palaeoenvironment and recover field, in particular to quantitative reconstruction method and the dress of a kind of paleao-water depth Put.
Background technology
Deposit enters in fossil sea floor or lake with transporting medium, the water depth corresponding when there is deposition Referred to as paleao-water depth.Oil mainly preserves and is deposited buried formed sedimentary formation after thing is filled in fossil sea floor or lake In, especially in China, petroleum resources primarily forms and is stored in the sedimentary basin that ancient lake is formed, and therefore, studies fossil lake Water depth during deposits in pool, contributes to judging depositional hydrodynamic force, depositional environment and sedimentary facies, for oil gas field Exploration, develop and evaluate and have great importance.
Existing fossil lake basin deposition period paleao-water depth quantitative reconstruction method is mainly ripple mark restoring method.And existing ripple mark is extensive Result obtained by multiple method is the single-point paleao-water depth data at ripple mark growth, and it is deep to obtain same deposition period lake basin water body The continuous data of degree change.This for the later stage to the exploration of oil gas field, to develop and evaluate be all totally unfavorable.
Therefore, the paleao-water depth restoration methods of a kind of continuous data that can obtain the change of contemporaneity lake basin water depth becomes For current problem demanding prompt solution.
Summary of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of quantitative reconstruction method of paleao-water depth and device, The continuous data of same deposition period lake basin water depth change can be obtained.
First aspect, embodiments provides a kind of quantitative reconstruction method of paleao-water depth, including:
Determine the growth region, dam, beach in the research layer position of fossil lake basin；
Determine the single-point paleao-water depth of at least a bite typical case well in growth region, dam, described beach；
Determine the Th content in typical case's well described at least a bite in growth region, dam, described beach and U content, and according to institute State Th content and described U cubage Th and U ratio；
According to Th Yu the U ratio corresponding to all typical case's single-point paleao-water depth of wells and single-point paleao-water depth position, plan Close the relation equation of single-point paleao-water depth and Th/U value, recover the quantitative paleao-water depth of described typical case's well；
According to the relation equation of single-point paleao-water depth Yu Th/U value, recover other well of growth region, dam, Pen Zhongfei beach, described fossil lake Quantitative paleao-water depth.
In conjunction with first aspect, embodiments provide the first possible embodiment of first aspect, wherein: institute State and determine that the growth region, Zhong Tan dam, research layer position of fossil lake basin specifically includes:
Obtain the geological foundation data of fossil lake basin；Described geological foundation data includes: geologic setting data, existing drilling well money Material and Dss Data；
Growth region, dam, described beach is determined according to described geological foundation data.
In conjunction with first aspect, embodiments provide the embodiment that the second of first aspect is possible, wherein: institute State drilling data to include: the existing well-log information of well, log data, rock core information and geological layering data；Described artificially Shake data includes: seismic data cube data, layer position interpretation data and fault interpretation data；
Determine that research growth region, Zhong Tan dam, layer position specifically includes according to described geological foundation data:
Utilize described layering data and described layer position interpretation data, determine the degree of depth model of the research layer position of every a bite well Enclose；
Utilize the well-log information in depth bounds, log data, rock core information and Dss Data, identify that dam, beach sinks Long-pending body, and determine growth region, dam, described beach.
In conjunction with first aspect, embodiments provide the third possible embodiment of first aspect, wherein: institute State and determine that in growth region, dam, described beach, the single-point paleao-water depth of at least one typical case's well specifically includes:
According to described well-log information, log data and rock core information, ripple mark empirical formula method is used to recover at least flatly The single-point paleao-water depth of described typical case's well；
And/or,
According to described well-log information, log data and rock core information, dam sand Thickness Method is used to recover at least described in a bite The single-point paleao-water depth of typical case's well.
In conjunction with first aspect, embodiments provide the 4th kind of possible embodiment of first aspect, wherein:
In described ripple mark empirical equation, described single-point paleao-water depth hmaxMeet formula:
h m a x = 2.272 λ 1.5 D - 0.5 U t · l n ( 0.419 πλ 0.5 D - 0.5 U t + 0.176 π 2 λ D U t 2 - 1 )
λ is ripple mark length；D is deposited particles diameter；ρ is aqueous medium density；ρsFor sediment density；UtOpen for deposit Begin the critical velocity moved；
Wherein, UtMeet formula:
U t = ρ ρ s - ρ 1 + 1 - 9.1728 D λ ( ρ s - ρ ρ ) 2 2 .
In conjunction with first aspect, embodiments provide the 5th kind of possible embodiment of first aspect, wherein: institute State the Th content in typical case's well described at least a bite determined in growth region, dam, described beach and U content, specifically include:
Obtain in typical case's well238U,232Th,40The mixed spectrum of K gamma radiation log, from the general middle analysis of described mixing Obtain described Th content and described U content.
In conjunction with first aspect, embodiments provide the 6th kind of possible embodiment of first aspect, wherein: institute State Th Yu the U ratio corresponding to the single-point paleao-water depth according to all typical case's wells and single-point paleao-water depth position, matching single-point Paleao-water depth and the relation equation of Th/U value, the quantitative paleao-water depth recovering described typical case's well specifically includes:
According to Th Yu the U ratio corresponding to all described typical case's single-point paleao-water depth of wells and single-point paleao-water depth position Set up regression equation, it is thus achieved that paleao-water depth and the relational expression of Th Yu U ratio；
According to described relational expression, calculate and study the quantitative paleao-water depth in layer position described in all typical case's wells.
In conjunction with first aspect, embodiments provide the 7th kind of possible embodiment of first aspect, wherein:
Described regression equation meets:
Y=a*xb；
In formula: y is lake basin water depth；X is Th/U value；A, b are coefficient.
In conjunction with first aspect, embodiments provide the 8th kind of possible embodiment of first aspect, wherein: also Including: according to the most ancient water of fossil lake other well of basin described in described typical case's quantitative paleao-water depth of well and growth region, dam, non-beach Deeply, it is thus achieved that the vertical continuous and quantitative paleao-water depth data with sea level changes of fossil lake basin same deposition period water depth.
Second aspect, the embodiment of the present invention also provides for the quantitative reconstruction device of paleao-water depth, including:
Area determination module is grown on dam, beach, the growth region, dam, beach in the research layer position determining fossil lake basin；
Single-point paleao-water depth determines module, for determining the single-point Gu water of at least a bite typical case well in growth region, dam, described beach Deeply；
Th content and U content ratio determine module, for determining allusion quotation described at least a bite in growth region, dam, described beach Th content in type well and U content, and according to described Th content and described U cubage Th and U ratio；
Growth region, dam, beach paleao-water depth recovers module, for the single-point paleao-water depth according to all typical case's wells and single-point Gu water Deep Th Yu U ratio corresponding to position, matching single-point paleao-water depth and the relation equation of Th/U value, recover described typical case's well Quantitatively paleao-water depth；
Growth region, dam, the non-beach depth of water recovers module, for the relation equation according to single-point paleao-water depth Yu Th/U value, recovers The quantitative paleao-water depth of other well of growth region, dam, Pen Zhongfei beach, described fossil lake.
The quantitative reconstruction method of the paleao-water depth that the embodiment of the present invention is provided and device, first obtain in growth region, dam, beach At least single-point paleao-water depth of a bite typical case well, and determine Th content and U content in typical case's well, and according to described Th content and institute State U cubage Th and U ratio；Then according to single-point paleao-water depth and the single-point paleao-water depth position of above-mentioned all typical case's wells Corresponding Th Yu U ratio, matching single-point paleao-water depth and the relation equation of Th/U value, recover all allusion quotations in growth region, dam, described beach The quantitative paleao-water depth of type well；Afterwards according to the relation equation of single-point paleao-water depth Yu Th/U value, recover described in growth region, dam, non-beach In the basin of fossil lake in addition to described typical case's well the quantitative paleao-water depth of other well.Final acquisition fossil lake basin same deposition period lake basin water body is deep Spend vertical and sea level changes continuous data.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferred embodiment cited below particularly, and coordinate Appended accompanying drawing, is described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by embodiment required use attached Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, and it is right to be therefore not construed as The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to this A little accompanying drawings obtain other relevant accompanying drawings.
Fig. 1 shows the flow chart of the quantitative reconstruction method of a kind of paleao-water depth that the embodiment of the present invention provided；
Fig. 2 shows in the paleao-water depth quantitative reconstruction method that the embodiment of the present invention is provided, and determines growth region, dam, beach The flow chart of concrete grammar；
Fig. 3 shows in the paleao-water depth quantitative reconstruction method that the embodiment of the present invention is provided, the schematic diagram of dam sand Thickness Method；
Fig. 4 shows in a kind of paleao-water depth quantitative reconstruction method that the embodiment of the present invention is provided, the sedimentary facies of study area Schematic diagram；
Fig. 5 shows in the paleao-water depth quantitative reconstruction method that the embodiment of the present invention is provided, sh52 well composite columnar section；
Fig. 6 shows in the paleao-water depth quantitative reconstruction method that the embodiment of the present invention is provided, and uses sand dam Thickness Method to calculate C The schematic diagram of some single-point paleao-water depth；
Fig. 7 shows in the paleao-water depth quantitative reconstruction method that the embodiment of the present invention is provided, and uses sand dam Thickness Method to calculate D The schematic diagram of some single-point paleao-water depth；
Fig. 8 shows that in the paleao-water depth quantitative reconstruction method that the embodiment of the present invention is provided, the relative water body of sh52 well is deep Degree schematic diagram；
Fig. 9 shows the single-point Gu water in the paleao-water depth quantitative reconstruction method that the embodiment of the present invention is provided, to sh52 well The fitted trend figure that deep and Th/U value is fitted；
Figure 10 shows in the paleao-water depth quantitative reconstruction method that the embodiment of the present invention is provided, and sh52 well is in research layer position The quantitatively schematic diagram of paleao-water depth；
Figure 11 shows in the paleao-water depth quantitative reconstruction method that the embodiment of the present invention is provided, and it is fixed that layer position is studied carefully by sh118 Jingyan County The schematic diagram of amount paleao-water depth curve.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention Middle accompanying drawing, is clearly and completely described the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only It is a part of embodiment of the present invention rather than whole embodiments.Generally real with the present invention illustrated described in accompanying drawing herein The assembly executing example can be arranged with various different configurations and design.Therefore, below to the present invention's provided in the accompanying drawings The detailed description of embodiment is not intended to limit the scope of claimed invention, but is merely representative of the selected reality of the present invention Execute example.Based on embodiments of the invention, the institute that those skilled in the art are obtained on the premise of not making creative work There are other embodiments, broadly fall into the scope of protection of the invention.
At present for fossil lake basin deposition period paleao-water depth quantitative reconstruction when, general employing ripple mark empirical formula method. Existing ripple mark empirical formula method is calculating paleao-water depth when, and parameter is many and chooses random big.Most importantly, due to Calculating based on ripple mark, therefore in sedimentary basin, the obsolete region of ripple mark (such as lake basin relatively deepwater regions) just cannot obtain To paleao-water depth data, and obtained result is the single-point paleao-water depth data at ripple mark growth, and cannot obtain this deposition The continuous data of lake basin water depth change in period.
Based on this, a kind of quantitative reconstruction method of paleao-water depth that the application provides and device, it is possible to obtain same deposition The continuous data of lake basin water depth change in period.The method is generally directed in gyittja basin have what ach-bar sandbody was grown Stratum carries out deposition period paleao-water depth recovery, and utilization recovers paleao-water depth data can be with assistant depositing environmental analysis, STRATIGRAPHIC DIVISION pair Many researchs such as ratio, SEDIMENTARY FACIES ANALYSIS, provide foundation for basin fill research with oil-gas exploration.
For ease of the present embodiment is understood, first the most extensive to a kind of paleao-water depth disclosed in the embodiment of the present invention Compound recipe method describes in detail,
Shown in Figure 1, the quantitative reconstruction method of the paleao-water depth that the embodiment of the present invention is provided includes:
S101: determine the growth region, dam, beach in the research layer position of fossil lake basin；
Implementing when, dam, beach lithosomic body is to beach sand lithosomic body and the general designation of dam sand lithosomic body.Ancient lake quilt Deposit is buried in underground after filling, and implant therein forms the deposition bottom in basin, and deposition bottom is formed according to it Earth history Development stage is different layer position.Research layer position is the sedimentary formation formed some specific period, and it is by obtaining The data taken and the purpose of research determine.And on (the i.e. dam, beach, growth region, Zhong Tan dam, research layer position determining fossil lake basin The growth region of lithosomic body) after, just can study targetedly for this growth region, dam, beach.
Concrete, shown in Figure 2, the embodiment of the present invention also provides for beach in a kind of research layer position specifically determining fossil lake basin The concrete grammar in growth region, dam, the method includes:
S201: obtain the geological foundation data of fossil lake basin；Described geological foundation data includes: geologic setting data, existing Drilling data and Dss Data.
Implementing when, the geologic setting data of fossil lake basin includes: the type in basin, the shaping age in basin, Producing horizon etc. main in basin, and these data mainly obtain from the correlative theses delivered and published pertinent texts Arrive, it is also possible to obtain from the existing geological research to fossil lake basin.Geologic setting data be mainly obtained in order to really General area to be studied.Existing drilling data is at present fossil lake basin to be carried out the data measured by drilling well.Specifically include: survey Well data, log data, rock core information and geological layering data.Dss Data includes seismic data and explains money Material, specifically includes: seismic data cube data, layer position interpretation data and fault interpretation data.Obtaining of above-mentioned geological foundation data Must be to provide sufficient data support for the quantitative paleao-water depth of follow-up recovery.
S202: determine growth region, dam, described beach according to described geological foundation data.
Implementing when, the research layer of fossil lake basin can be determined according to various data acquired in above-mentioned S201 The growth scope of Zhong Tan dam, position lithosomic body.This growth scope i.e. dam, beach growth region.Owing to research layer position is by acquired upper State geological foundation data and research purpose determined, therefore, concrete dam, determination beach lithosomic body grow region time Wait, will determine that the depth bounds of layer position is studied carefully by every a bite Jingyan County first with individual well individual-layer data and artificial earthquake individual-layer data；Profit again With the well-log information in depth bounds, log data, rock core information and Dss Data, identify dam, beach lithosomic body, and combine Close the concrete condition of multiple well, determine the distribution of dam, beach lithosomic body.Wherein, the identification feature of dam, beach lithosomic body sees following Shown in table 1:
Table 1
According to each recognition marks in above-mentioned table 1, it can be determined that go out growth region, dam, beach.
After determining growth region, dam, beach, also include:
S102: determine the single-point paleao-water depth of at least one typical case's well in growth region, dam, described beach.
Implementing when, need to choose dam, beach lithosomic body and grow the typical well in region, according to its rock core information, Well-log information, log data recover the single-point paleao-water depth data of at least a bite typical case well in research layer position.Typical case's well refers in research In layer position, the ach-bar sandbody that identifies grows more well, and typical case's well must have research layer position in full section or part interval Rock core information and natural gamma-ray spectral.The quantity of typical case's well the most flatly, can be many mouthfuls.According to typical case's well Data is recovered single-point paleao-water depth and is used two kinds of methods:
1, ripple mark empirical formula method is used to recover the single-point paleao-water depth of typical case's well described at least a bite.
Ripple mark can be identified in rock core by the rock core information in drilling data.
Ripple mark empirical formula method is proposed in 1980 by Mille and Komar, and it mainly comprises the following steps:
For pararipple, if meet between ripple mark length lambda (cm) and deposited particles diameter D (μm) relation: λ < 0.0028D1.68, then have:
Nearly substrate point tracks diameter d0Can represent by equation below:
d0=λ/0.65；
Critical velocity U of deposit setting in motiontCan represent by equation below:
U t 2 = 0.21 ( d 0 / D ) 1 / 2 ( &rho; s - &rho; ) g D / &rho; , D < 0.5 m m 0.46 &pi; ( d 0 / D ) 1 / 4 ( &rho; s - &rho; ) g D / &rho; , D &GreaterEqual; 0.5 m m ;
In formula: ρ is aqueous medium density (g/cm3)；
ρsFor sediment density (g/cm3)；
G is acceleration of gravity；
Relative to Ut, corresponding deep water wavelength LtFor:
Lt=π gd02/2Ut2
Then the ultimate value of actual wavelength L is:
L max , min = L t 1 &PlusMinus; 1 - 80 &CenterDot; 4 U t 4 / ( g 2 d 0 2 ) 2 ;
Corresponding paleao-water depth ultimate value hmax(m) be:
h max = L m a x 2 &pi; a r cosh ( 0.142 L max d 0 ) ;
Above formula is iterated abbreviation, obtains below equation:
U t = &rho; &rho; s - &rho; 1 + 1 - 9.1728 D &lambda; ( &rho; s - &rho; &rho; ) 2 2 ;
h m a x = 2.272 &lambda; 1.5 D - 0.5 U t &CenterDot; l n ( 0.419 &pi;&lambda; 0.5 D - 0.5 U t + 0.176 &pi; 2 &lambda; D U t 2 - 1 ) .
Unknown number in formula: ripple mark length lambda can be obtained by actual measurement of rock core；
Deposited particles diameter D can be obtained by grain size analysis data；
Aqueous medium density p can be estimated by geochemical indicators；
Sediment density ρsCan be measured by actual rock core or density log data obtains；
From the foregoing, obtaining ripple mark length, deposited particles diameter, aqueous medium density, these four ginsengs of sediment density After the data of number, it is possible to calculate the paleao-water depth at this ripple mark position.
2, dam sand Thickness Method is used to recover the single-point paleao-water depth of typical case's well described at least a bite.
Being embodied as when, according to the achievement in research of Jiang et al. (2014), different hydrodynamic zones controls not Growth with dam, type beach.Assuming that on the premise of having the supply of sufficient thing source, the thickness of dissimilar ach-bar sandbody can be anti- Reflect the depth of water of its place hydrodynamic zone.Identify dam, beach development period (i.e. one subsequence) and wherein inhomogeneity accurately The dam, beach of type, can recover paleao-water depth.
Shown in Figure 3, it is assumed that in a development period, remote bank dam thickness is H1, and offshore dam thickness is H2, edge Bank dam thickness is H3, then the paleao-water depth of littoral dam deposition period is H3, and the paleao-water depth of offshore dam deposition period is H2+H3, far The paleao-water depth of bank dam deposition period is H1+H2+H3.In actual application, because dam sand lithosomic body is deep after depositing in basin Burying, by the action of gravity of overlying sediments thing, cause pore pressure to become big, Fluid in Pore is discharged, and hole diminishes, and i.e. produces compacting Effect.Thus the sand thickness identified in rock core is not its original sand thickness at deposition period, in addition it is also necessary to go Compaction treatment is transferred to primary deposit thickness.
It should be noted that owing to simple use ripple mark empirical formula method is merely able to obtain the list of growth ripple mark position Point paleao-water depth, therefore, specifically applying when, is that above two method is combined application, such as, in typical case's well, Use ripple mark empirical formula method to calculate single-point paleao-water depth in the position identifying ripple mark, identify dam, beach development period Utilization dam, position sand Thickness Method calculates single-point paleao-water depth.
The embodiment of the present invention also provides for an embodiment specifically carrying out single-point paleao-water depth recovery.This embodiment is with Liao Hexi As a example by Es4 upper sub-member stratum, depression Shubei area, portion,
According to classical Based On Sequence Stratigraphic Theory, WEST DEPRESSION OF LIAOHE OILFIELD Shubei area Es4 upper sub-member is divided into two three grades of layers Sequence (SQ1 and SQ2), the research layer position of this example is SQ2, can be divided into low stand system tract (LST) and trangressive system tract (TST), in the range of study area dam, beach lithosomic body major developmental in LST.The deposition phasor of study area is as shown in Figure 4.Choose The sh52 well that wherein ach-bar sandbody is relatively grown, carries out single-point paleao-water depth recovery.
Sh52 well has, in research layer position, (rock core) data of partly coring, and the composite columnar section of sh52 well is as shown in Figure 5.Root According to data practical situation, use aforementioned ripple mark empirical formula method and dam sand Thickness Method, respectively tetra-points of A, B, C, D are carried out single-point Paleao-water depth recovers:
Wherein, A point: at 2711.15 meters, use ripple mark empirical formula method；
Ripple mark length lambda is 4.49cm, the actual measurement of rock core obtain；Deposited particles diameter D is 0.11mm, by grain size analysis Data obtains；Aqueous medium density p approximation value 1.05Kg/m3；Sediment density ρ s is 2.37 × 103Kg/m3, by actual rock core Measure and obtain.Bringing in aforementioned ripple mark empirical formula method equation, being finally calculated the single-point paleao-water depth that A points out is 6.10 meters.
B point: at 2709.45 meters, employing ripple mark empirical formula method:
Ripple mark length lambda is 4.86cm, the actual measurement of rock core obtain；Deposited particles diameter D is 0.12mm, by grain size analysis Data obtains；Aqueous medium density p approximation value 1.05Kg/m3；Sediment density ρ s is 2.31 × 103Kg/m3, by actual rock core Measure and obtain.Bringing in aforementioned ripple mark empirical formula method equation, being finally calculated paleao-water depth is 6.97 meters.
C point: at 2648 meters, employing dam sand Thickness Method (shown in Figure 6):
Complete dam, a beach development period is identified, including remote bank dam, offshore dam and littoral dam at 2643-2648m.Press According to the theory of dam sand THICKNESS CALCULATION paleao-water depth, when dam body deposits, deep water it is sequentially depositing remote bank dam, offshore dam and edge to shallow water Bank dam, during three dam body depositions, thickness comprehensively can reflect that remote bank dam starts ancient water at deposition period paleao-water depth, i.e. 2648m Deeply.As previously described, because the existence of compaction, the dam body thickness observed now can not reflect thickness when it deposits, and needs Carry out compacting to recover.
The compacting of sh52 well recovers the method using burial history reconstruction, adds up the group of each earth history deposit in period Becoming, bury thickness, sedimentation age and the Compaction Law of different lithology deposit now, input is to Schlumberger company PetroMod basin modelling software carry out burial history reconstruction, the compacting factor obtaining studying layer position is that 0.59 (compacting factor is The ratio of formation thickness and the thickness in deposit primary deposit period now).
Being 0.5 meter by aforementioned remote bank dam thickness, offshore dam thickness is 2.5 meters, and littoral dam thickness is 0.5 meter, then Dam body gross thickness is 3.5 meters, and compacting factor is 0.59 again, and obtaining paleao-water depth at 2648 meters is 5.93 meters.
D point: at 2612.5 meters, employing dam sand Thickness Method (shown in Figure 7):
Same employing dam sand Thickness Method, process is as previously mentioned.Identify dam, a beach development period completed, remote bank dam Thickness is 1 meter, and offshore dam thickness is 2 meters, and littoral dam thickness is 1 meter, then dam body gross thickness is 4 meters, and compacting factor is again 0.59, obtaining paleao-water depth at 2612.5 meters is 6.78 meters.
S103: determine the Th content in the described typical case well of at least one in growth region, dam, described beach and U content, and root According to described Th content and described U cubage Th (thorium) and U (uranium) ratio.
Implementing when, in ancient lake, the corresponding different Redox Condition of the different depth of water.At shore Vlei Shallow-water environment, the oxygenation degree of water body is the highest, shows as oxidation environment；Along with the depth of water becomes big, the oxygenation degree of water diminishes, gradually Transition is reducing environment；To territory, deep lake region, lake basin center, for strong reducing environment.Therefore, the water depth of lake basin can be by it Redox Condition reflects.
In one lake basin, the redox environment of water body can be sentenced by different elementary composition and isotopic content distributions Disconnected.Uranium element forms readily soluble U under oxidative conditions6+, cause uranium element to be dissolved in water body and migrate, uranium element content in deposit Less；And uranium element forms the U not readily dissolved under the reducing conditions4+, make uranium element constantly be enriched with.And thorium element is predominantly Th4+, stable chemical nature, it is difficult to migrate, is not affected by Redox Condition.Further, U4+And Th4+In close relations, The silicates and oxides structural type that they are formed is identical, often in isomorphous replacement.Therefore, it can utilize thorium in deposit Element and the ratio of uranium element, it is judged that the oxidation-reduction quality of depositional environment.And water when the oxidation-reduction quality of depositional environment and deposition The degree of depth of body is correlated with, the relative depth size of water body therefore and then when may determine that deposition.
Natural gamma-ray spectrometry method in geophysical log, by measuring in stratum238U,232Th,40K (potassium) gal The radioactive mixed spectrum of horse, therefrom obtain the gamma-rays power spectrum of different-energy, processes through analysis of spectrum and can obtain thorium, uranium, potassium Content.Therefore, according to the Th content in natural gamma-ray spectrometry and U content, Th/U ratio can be calculated, and Th/U ratio The relative depth size of water body when may determine that deposition.It is said that in general, under shallow-water environment, water body is oxidisability, uranium element shape Become readily soluble U6+And migrate, cause uranium element content in deposit low, and thorium element is unaffected, therefore Th/U ratio is bigger； Contrary, under deepwater environment, water body is reproducibility, and uranium element forms the U4+ not readily dissolved and is enriched in deposit, therefore Th/U ratio is less.To sum up, Th/U ratio and water depth are inverse ratio, i.e. the Th/U ratio big reflection depth of water is shallower, Th/U ratio The little reflection depth of water is bigger.
Still as a example by sh52 well, in research layer position, calculate Th/U ratio by natural gamma-ray spectrometry, be used for anti- Reflect relative water depth.Shown in Figure 8, at low stand system tract (LST), water depth is less, and the most gradually becomes Shallow, to trangressive system tract (TST), water body starts to deepen.Water body is consistent with sequence stratigraphy definition relative to variation tendency.Curve is anti- Reflect the relative change of lake basin water depth, but absolute water depth value cannot have been obtained.
S104: according to Th with the U ratio corresponding to all typical case's single-point paleao-water depth of wells and single-point paleao-water depth position Value, matching single-point paleao-water depth and the relation equation of Th/U value, recover the quantitative paleao-water depth of described typical case's well.
Implementing when, specifically will be according to corresponding to the single-point paleao-water depth data in all typical case's wells and this point Th Yu U ratio, sets up regression equation, obtains paleao-water depth and Th/U value relational expression.
In shallow-water environment, uranium element forms readily soluble U under oxidative conditions6+, cause uranium element to be dissolved in water body and migrate, In deposit, uranium element content is less.Characteristic according to uranium element, it is assumed that when water depth is 0, uranium element migrates completely, i.e. Its content is 0, and now Th/U value levels off to infinity.Along with water depth increases, oxidisability weakens, and reproducibility strengthens, Th/U Value increases.Th/U value and water depth are inverse relation.Analyze, under meeting conditions above, it is assumed that both sides relation according to above Following formula is met for power function, i.e. both sides relation:
Y=a*xb (1)
In formula: y is lake basin water depth；X is Th/U value；A, b are coefficient；
By step S102 obtains typical case well multiple single-point paleao-water depth data, by step S103 obtains Th/U value song Line, therefrom can obtain the Th/U value corresponding to single-point paleao-water depth depth.
As a example by sh52 well, its result such as table 2 below:
Table 2
Four point data in table 2 are brought in formula (1), the result in being obtained such as Fig. 9 by fitted trend line,
The relation finally giving paleao-water depth and Th/U value is:
Y=41.04x-0.65
Calculate sh52 well Th/U curve by this relational expression, obtain the sh52 well absolute paleao-water depth in research layer position.
It can be seen from fig. 10 that deposit the phase at Es4 upper sub-member SQ2, at sh52 well, paleao-water depth value is between 3～14 meters. In LST period, lake basin water body is shallower, and upheaval between 3～9 meters, to deposit dam, beach sand；After first lake is general, water depth Quickly increasing, at TST water depth in period between 9～14 meters, ach-bar sandbody scale diminishes, and may be dam, storm beach sand, with Time germinate thin layer limestone.
According to described relational expression, calculate described all typical case Jingyan County and study carefully the quantitative paleao-water depth of layer position.
Being embodied as when, obtain all allusion quotations in the basin of fossil lake according to regression equation and natural gamma-ray spectral The quantitative paleao-water depth data in layer position are studied carefully by type Jingyan County.
S105: according to the relation equation of single-point paleao-water depth Yu Th/U value, recovers growth region, dam, Pen Zhongfei beach, described fossil lake The quantitative paleao-water depth of other well.
For the well in ach-bar sandbody aplasia region in lake basin, it is impossible to calculate single-point paleao-water depth, thus cannot obtain quantitatively Paleao-water depth curve.It is in same basin in view of these wells, and is identical research layer position, show its sedimentation period In the basin of fossil lake, water body is to connect, i.e. sedimentary formation is in the same period in the middle of same water body and deposits.Therefore, two Study thorium element in the stratum of layer position in mouthful well, the content of uranium element should comply with moving of two kinds of elements in its deposition period lake basin Move and the regularity of distribution, the general trend that i.e. two kinds of constituent contents are controlled by redox environment in deposition period lake basin.Therefore, In the research layer position of the obsolete well of ach-bar sandbody, the relation of Th/U value and lake basin water depth still conforms to above-mentioned relation formula:
Y=a*xb
In formula: y is lake basin water depth；X is Th/U value；A, b are coefficient
Therefore, still can utilize relation above formula, i.e. calculate according to the relation equation of single-point paleao-water depth with Th/U value The quantitative water depth of ach-bar sandbody aplasia area studies layer position.
In citing study area as a example by other a bite sh118 well, this well is located closer to lake basin center, does not has rock core to provide Material, thus single-point paleao-water depth recovers to lack rock core and demarcates, result is inaccurate, but has natural gamma-ray spectral.This Mouthful well still meets relational expression in S5 in research layer position Th/U value and paleao-water depth relation:
Y=41.04x-0.65
Layer position absolute paleao-water depth curve (such as Figure 11) is studied carefully by calculating sh118 Jingyan County.
From result of calculation it can be seen that sh118 well is in the upheaval between 7～12 meters of the LST depth of water in period, the depth of water becomes generally Shallow；Deepen at TST water body in period, between 10～20 meters, the deepest up to 23 meters.This result also with in sequence stratigraphy Related definition and the well position in lake basin is consistent.
It should be noted that above-mentioned S102 Yu S103 there is no the precedence of execution, being embodied as when, Ke Yigen The needs on border are carried out factually, or can also synchronize to carry out.
S106: according to described typical case's quantitative paleao-water depth of well and determining of described fossil lake Pen Feitan dam other well of growth region Amount paleao-water depth, it is thus achieved that the vertical continuous and quantitative paleao-water depth data with sea level changes of fossil lake basin same deposition period water depth.
The quantitative reconstruction method of the paleao-water depth that the embodiment of the present invention is provided, first in acquisition growth region, dam, beach at least flatly The single-point paleao-water depth of typical case's well, and determine Th content and U content in typical case's well, and according to described Th content and described U content Calculate Th Yu U ratio；Then according to corresponding to above-mentioned all typical case's single-point paleao-water depth of wells and single-point paleao-water depth position Th Yu U ratio, the relation equation of matching single-point paleao-water depth and Th/U value, recover all typical wells in growth region, dam, described beach Quantitative paleao-water depth in research layer position；Afterwards according to the relation equation of single-point paleao-water depth Yu Th/U value, recover in the basin of described fossil lake Growth region, dam, non-beach is the quantitative paleao-water depth of other well in addition to described typical case's well.Final obtained fossil lake basin same deposition period lake The vertical continuous data with sea level changes of basin water depth.
It should be noted that one of the only this method of being illustrated simple realization, the flow process of this method is described.Reality should Single-point paleao-water depth recovery can be carried out in many mouthfuls of typical wells according to data situation in, and according to the single-point Gu water of multiple wells Th/U value the regression equation corresponding to deep data and single-point paleao-water depth position, make regression equation have higher accurately Property.
The embodiment of the present invention also provides for the quantitative reconstruction device of a kind of paleao-water depth, including:
Area determination module is grown on dam, beach, the growth region, dam, beach in the research layer position determining fossil lake basin；
Single-point paleao-water depth determines module, for determining the single-point Gu water of at least a bite typical case well in growth region, dam, described beach Deeply；
Th content and U content ratio determine module, for determining allusion quotation described at least a bite in growth region, dam, described beach Th content in type well and U content, and according to described Th content and described U cubage Th and U ratio；
Growth region, dam, beach paleao-water depth recovers module, for the single-point paleao-water depth according to all typical case's wells and single-point Gu water Deep Th Yu U ratio corresponding to position, matching single-point paleao-water depth and the relation equation of Th/U value, recover described typical case's well Quantitatively paleao-water depth；
Growth region, dam, the non-beach depth of water recovers module, for the relation equation according to single-point paleao-water depth Yu Th/U value, recovers The quantitative paleao-water depth of other well of growth region, dam, Pen Zhongfei beach, described fossil lake.
In the present embodiment, area determination module, single-point paleao-water depth computing module, Th Yu U ratio calculation module are grown in dam, beach Concrete function and interactive mode with paleao-water depth recovers module, can be found in the record of embodiment corresponding for Fig. 1, the most superfluous at this State.
The computer program of the quantitative reconstruction method and apparatus of the paleao-water depth that the embodiment of the present invention is provided, including depositing Having stored up the computer-readable recording medium of program code, the instruction that described program code includes can be used for performing previous methods and implements Method described in example, implements and can be found in embodiment of the method, does not repeats them here.
Those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, and the system of foregoing description With the specific works process of device, it is referred to the corresponding process in preceding method embodiment, does not repeats them here.
If described function is using the form realization of SFU software functional unit and as independent production marketing or use, permissible It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is the most in other words The part contributing prior art or the part of this technical scheme can embody with the form of software product, this meter Calculation machine software product is stored in a storage medium, including some instructions with so that a computer equipment (can be individual People's computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention. And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM, Read-Only Memory), random access memory are deposited The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic disc or CD.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain Cover within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with scope of the claims.

Claims (10)

1. the quantitative reconstruction method of a paleao-water depth, it is characterised in that including:
Determine the growth region, dam, beach in the research layer position of fossil lake basin；
Determine the single-point paleao-water depth of at least a bite typical case well in growth region, dam, described beach；
Determine the Th content in typical case's well described at least a bite in growth region, dam, described beach and U content, and according to described Th Content and described U cubage Th and U ratio；
According to Th Yu the U ratio corresponding to all typical case's single-point paleao-water depth of wells and single-point paleao-water depth position, matching list Point paleao-water depth and the relation equation of Th/U value, recover the quantitative paleao-water depth of described typical case's well；
According to the relation equation of single-point paleao-water depth Yu Th/U value, recover determining of described fossil lake Pen Zhongfei beach dam other well of growth region Amount paleao-water depth.
Method the most according to claim 1, it is characterised in that the described development area, Zhong Tan dam, research layer position determining fossil lake basin Territory specifically includes:
Obtain the geological foundation data of fossil lake basin；Described geological foundation data includes: geologic setting data, existing drilling data with And Dss Data；
Growth region, dam, described beach is determined according to described geological foundation data.
Method the most according to claim 2, it is characterised in that described drilling data includes: the existing well-log information of well, record Well data, rock core information and geological layering data；Described Dss Data includes: seismic data cube data, layer position are explained Data and fault interpretation data；
Determine that research growth region, Zhong Tan dam, layer position specifically includes according to described geological foundation data:
Utilize described geological layering data and described layer position interpretation data, determine the degree of depth model of the research layer position of every a bite well Enclose；
Utilize the well-log information in depth bounds, log data, rock core information and Dss Data, identify dam, beach deposition Body, and determine growth region, dam, described beach.
Method the most according to claim 3, it is characterised in that described determine in growth region, dam, described beach at least a bite allusion quotation The single-point paleao-water depth of type well specifically includes:
According to described well-log information, log data and rock core information, ripple mark empirical formula method is used to recover at least described in a bite The single-point paleao-water depth of typical case's well；
And/or,
According to described well-log information, log data and rock core information, dam sand Thickness Method is used to recover at least typical case described in a bite The single-point paleao-water depth of well.
Method the most according to claim 4, it is characterised in that in described ripple mark empirical equation, described single-point paleao-water depth hmaxMeet formula:
h m a x = 2.272 &lambda; 1.5 D - 0.5 U t &CenterDot; ln ( 0.419 &pi;&lambda; 0.5 D - 0.5 U t + 0.176 &pi; 2 &lambda; D U t 2 - 1 )
λ is ripple mark length；D is deposited particles diameter；ρ is aqueous medium density；ρsFor sediment density；UtFortune is started for deposit Dynamic critical velocity；
Wherein, UtMeet formula:
U t = &rho; &rho; s - &rho; 1 + 1 - 9.1728 D &lambda; ( &rho; s - &rho; &rho; ) 2 2 .
6. according to the method described in claim 1-5 any one, it is characterised in that described determine in growth region, dam, described beach At least a bite described in typical case well in Th content and U content, specifically include:
Obtain in typical case's well238U,232Th,40The mixed spectrum of K gamma radiation well-log information, analyzes from described mixed spectrum and obtains Described Th content and described U content.
Method the most according to claim 6, it is characterised in that the described single-point paleao-water depth according to all typical case's wells and list The point Th Yu U ratio corresponding to paleao-water depth position, matching single-point paleao-water depth and the relation equation of Th/U value, recover described allusion quotation The quantitative paleao-water depth of type well specifically includes:
According to Th Yu the U ratio foundation corresponding to all described typical case's single-point paleao-water depth of wells and single-point paleao-water depth position Regression equation, it is thus achieved that paleao-water depth and the relational expression of Th Yu U ratio；
According to described relational expression, calculate and study the quantitative paleao-water depth in layer position described in all typical case's wells.
Method the most according to claim 7, it is characterised in that described regression equation meets:
Y=a*xb；
In formula: y is lake basin water depth；X is Th/U value；A, b are coefficient.
Method the most according to claim 1, it is characterised in that also include:
Quantitative paleao-water depth according to described typical case's well and the most ancient water of other well of growth region, dam, Pen Zhongfei beach, described fossil lake Deeply, it is thus achieved that the vertical continuous and quantitative paleao-water depth data with sea level changes of fossil lake basin same deposition period water depth.
10. the quantitative reconstruction device of a paleao-water depth, it is characterised in that including:
Area determination module is grown on dam, beach, the growth region, dam, beach in the research layer position determining fossil lake basin；
Single-point paleao-water depth determines module, for determining the single-point paleao-water depth of at least a bite typical case well in growth region, dam, described beach；
Th content and U content ratio determine module, for determining typical case's well described at least a bite in growth region, dam, described beach In Th content and U content, and according to described Th content and described U cubage Th and U ratio；
Growth region, dam, beach paleao-water depth recovers module, for the single-point paleao-water depth according to all typical case's wells and single-point paleao-water depth institute At Th Yu the U ratio corresponding to position, matching single-point paleao-water depth and the relation equation of Th/U value, recover the quantitative of described typical case's well Paleao-water depth；
Growth region, dam, the non-beach depth of water recovers module, for the relation equation according to single-point paleao-water depth Yu Th/U value, recovers described The quantitative paleao-water depth of other well of growth region, Pen Feitan dam, fossil lake.
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