CN107807411A - A kind of high-quality shale core card layer prediction method - Google Patents
A kind of high-quality shale core card layer prediction method Download PDFInfo
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- CN107807411A CN107807411A CN201711016454.8A CN201711016454A CN107807411A CN 107807411 A CN107807411 A CN 107807411A CN 201711016454 A CN201711016454 A CN 201711016454A CN 107807411 A CN107807411 A CN 107807411A
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- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
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Abstract
The present invention relates to oil and gas exploration and development field, and in particular to a kind of high-quality shale core card layer prediction method.High-quality shale provided by the invention core card layer prediction method, with reference to element, geochemical logging, landwaste color change situation and earthquake prediction, identification is cored early-warning point；Combine closely the live firsthand information simultaneously, real-time analysis and early warning point position, in time prediction is cored depth, instructs card layer to core work, and card standard is cored position, is realized and is saved operating cost, shorten construction period, reduce engineering risk.
Description
Technical field
The present invention relates to oil and gas exploration and development field, and in particular to the high-quality shale section of marine facies shale gas straight well takes
Heart card layer prediction method.
Background technology
The quasi- coring bed of shale gas well card can not only reduce unnecessary drilling risk, investment reduction amount, shorten and bore
The well cycle, and can accurately obtain and understand the multi-aspect informations such as high-quality shale section lithology, gassiness row, physical property, Geochemistry Parameters,
Oil in place, preferably target window is submitted to provide the firsthand information for the later stage.
Drilling technology when during card layer of coring frequently with control at present, by the control to rate of penetration, with reference to landwaste
Logging method, instruct to core, such a method is in high degree of prospecting area, it is possible to achieve accurate card standard is cored position.But
In actual application, work area drilling well is less, and Longma small stream group formation velocity changes greatly, cause target zone depth prediction precision compared with
It is low.Core hole cores that requirement is different, and longitudinal overlying strata variation is larger simultaneously, and element early-warning point in the plane whether
Representative etc. uncertain factor, cause the scene quasi- coring bed difficulty of card larger, easily cause position card of coring and forbidden,
Cause to take or take less more, can not can not finally reach geological target.
The content of the invention
It is an object of the invention to overcome the above-mentioned deficiency in the presence of prior art, there is provided a kind of more objective and accurate
Assess some block horizontal well and reasonably walk position, it is purpose shale gas Horizontal Well Targets window to improve well yield to greatest extent
Preferable technical method.
In order to realize foregoing invention purpose, the invention provides following technical scheme：
A kind of high-quality shale core card layer prediction method, comprise the following steps：
（1）Carry out the analysis of Longma small stream group stratum element data information, find the otherness of each upper single element in substratum shale longitudinal direction,
The obvious element of longitudinal difference is found out, is cored exercisable element early warning control point during card layer as scene；
（2）To work area, drilling well Longma small stream group earth cuttings are seen again, analyze each substratum landwaste color change feelings of Longma small stream group
Condition, color change position is found out, as landwaste color early warning control point；
（3）Carry out two and open seismic calibration work after end, block quasi- Permian base position, five Feng Zudi circle depth are carried out pre-
Survey, according to prediction result, shift to an earlier date rate controlling in prediction specified distance on position of coring, reserve grace time and carry out live judgement；
（4）Base area log data, longitudinally upper each substratum Geochemistry Parameters situation of change, searching are mutated analysis and distinguishing on longitudinal direction
Position, as Geochemistry Parameters early warning control point；
（5）Combining step（1）、（2）、（3）And（4）In element data information, landwaste information, earthquake information, change information,
Judge position of coring.
Further, in the step of analyzing each substratum landwaste color change situation of Longma small stream group, high-quality shale top is analyzed
Landwaste color change situation in the range of 30 meters.
Further, step（3）In, the distance to a declared goal is 15 meters -35 meters.
Further, step（3）In, the distance to a declared goal is 20 meters, 25 meters or 30 meters.
Further, step（3）In, the step of being predicted to five Feng Zudi circle depth, using tachometric method according to region
Upper Longma small stream group formation interval velocity predicts five Feng Zudi circle depth, and, using Thickness Method according to Longma small stream group in work area thickness
Spend variation tendency and Longma small stream group-five peak group thickness is calculated by T0 differences, analysis judges two methods result and regional stratum thickness
Whether situation of change is consistent, and it is prediction result to choose with the closest result of geological knowledge.
Compared with prior art, beneficial effects of the present invention：High-quality shale provided by the invention is cored the prediction of card layer
Method, with reference to element, geochemical logging, landwaste color change situation and earthquake prediction, identification cores early-warning point；Close knot simultaneously
Close the live firsthand information, real-time analysis and early warning point position, in time prediction is cored depth, instructs card layer to core work, card
Standard is cored position, is realized and is saved operating cost, shorten construction period, reduce engineering risk.
Brief description of the drawings：
Fig. 1 is basic step schematic diagram of the present invention；
Fig. 2 is element parameter control point analysis chart in the embodiment of the present invention；
Fig. 3 is Geochemistry Parameters control point analysis chart in the embodiment of the present invention；
Fig. 4 is design sketch of being cored in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.But this should not be interpreted as to this
The scope for inventing above-mentioned theme is only limitted to following embodiment, all to belong to the present invention based on the technology that present invention is realized
Scope.
Embodiment 1：As shown in figure 1, the present embodiment provides the Forecasting Methodology that a kind of high-quality shale cores card layer, its step bag
Include：
S100：Carry out the analysis of Longma small stream group stratum element, the upper landwaste elementary analysis differential boundary in longitudinal direction is found, if calcium constituent is by 1-
2 ↑ 5-6%, and this differential boundary has certain comparability on region, as early warning control point：Landwaste has been obtained using offset well
Element section, conventional logging data, obvious control point is set with overlying strata for cored interval, this area control point 1 has
For calcium constituent by 13.5-22.3 ↓ 4.2-8.5%, element silicon by 34.4-38.6 ↑ 50.5-53.4% feature, control point 2 has calcium member
Element is by 2.4-6.8 ↓ 0.9-1.4%, element sulphur by 0.34-0.68 ↓ 0.12-0.22%, v element by 0.037-0.078 ↓ 0.011-
0.024%th, for titanium elements by 1.6-2.4 ↓ 0.6-1.1% feature, control point 3 has ferro element by 4.8-6.4 ↑ 6.7-7.2%, phosphorus
For element by 0.09-0.15 ↓ 0.02-0.04%, element sulphur by 0.09-0.14 ↑ 0.20-0.38% feature, control point 4 has calcium member
For element by 0.31-1.96 ↑ 2.03-5.08%, P elements by 0.02-0.07 ↑ 0.13-0.14% feature, control point 5 has calcium constituent
By 3.4-7.3 ↑ 9.8-20.0%, element silicon by 52-57 ↓ 32-48%, potassium element by 3.4-3.7 ↓ 2.0-2.4%, aluminium element by
13.4-13.9 ↓ 5.5-7.2% feature, control point 6 have calcium constituent by 3.2-13.0 ↑ 16.8-34.8%, element silicon by 53-69
↓ 15-32% feature；
S200：To work area, drilling well Longma small stream group earth cuttings are seen again, see clearly Longma small stream group stratum, analysis and summary, longitudinal direction
One section of+five peak group of pliosaur is divided to two big sections according to color, and top dark color section is with, bottom black section；One section of top of dragon 9. -8. substratum
It is that ash, light gray, light green-gray in color mud shale are distinguished substantially for Dark grey mud shale and imperial two sections of bottoms.7. -1. substratum be greyish black, black
Mud shale, with top 9. -8. substratum be Dark grey mud shale chromatic zones show clearly；
S300：Logged well after terminating gamma, density curve data are opened according to two, carry out F (t)=S (t) × R (t) synthesis earthquakes in time
Record demarcation：Reflectance factor is calculated by speed and density log curve, reflectance factor and the seismic wavelet of extraction are carried out
Convolution obtains initial synthetic seismogram.Initial synthetic seismogram is corrected according to more accurate velocity field, then with well
Other seismic channel Matching and modification, obtains final synthetic seismogram.There is the seismic signature of strong wave peak using Permian base, accurately
Block quasi- Permian base position, tachometric method and Thickness Method is respectively adopted five Feng Zudi circle depth are predicted：First, according to region
Upper shale formation interval velocity predicts five Feng Zudi circle depth；2nd, according to Longma small stream group formation thickness situation of change in work area, pass through
T0 differences calculate Longma small stream group-five peak group thickness, analysis judge two kinds of arithmetic results and regional stratum thickness change situation whether phase
Symbol, choose and the closest result of geological knowledge.
S400：And base area log data, Primary Reference landwaste TOC changes of contents.The peak of Weiyuan area Longma small stream group+five
Group TOC contents show as gradually rising from top to bottom on longitudinal direction, and imperial two sections of TOC contents are typically in 0.1-0.15% or so, Long Yiduan
9., 8. substratum TOC contents 0.2-0.5%, 7. -4. substratum TOC rise rapidly, 3. -1. TOC has 0.4-0.5 ↑ 4-5%,（1. substratum
As five peak groups）Substratum TOC contents are more in 4-9%, average 4.5-5.1%.
S500：At the scene in operating process, element data that combining step S100, S200, S300, S400 are drawn respectively
Information, landwaste information, earthquake information, change information, using earthquake prediction, the well at the control point 1,2,3,4 judged with reference to element
Deep comprehensive descision drill bit is located at the layer position on stratum, determines whether position of coring, and realizes and blocks quasi- coring bed, reaches geological target
Requirement.
It should be noted that in the present invention, step S100, S200, S300, S400 are not carried out order, i.e. this four steps
It can carry out simultaneously, can also any order execution.
The effect of the present invention is explained below in conjunction with the accompanying drawings, and it is pre- that Fig. 2 gives element in the embodiment using the inventive method
Figure is chosen at alert control point, and label 1,2,3,4,5,6 represents control point 1, control point 2, control point 3, control point 4, control respectively in Fig. 2
System point 5, control point 6；It will be seen that control point 1 has calcium constituent by 13.5-22.3 ↓ 4.2-8.5%, element silicon from figure
By 34.4-38.6 ↑ 50.5-53.4% feature, control point 2 have calcium constituent by 2.4-6.8 ↓ 0.9-1.4%, element sulphur by
0.34-0.68 ↓ 0.12-0.22%, v element are by 0.037-0.078 ↓ 0.011-0.024%, titanium elements by 1.6-2.4 ↓ 0.6-
1.1% feature, control point 3 have ferro element by 4.8-6.4 ↑ 6.7-7.2%, P elements by 0.09-0.15 ↓ 0.02-0.04%,
For element sulphur by 0.09-0.14 ↑ 0.20-0.38% feature, control point 4 has calcium constituent by 0.31-1.96 ↑ 2.03-5.08%, phosphorus
For element by 0.02-0.07 ↑ 0.13-0.14% feature, control point 5 has calcium constituent by 3.4-7.3 ↑ 9.8-20.0%, element silicon
By 52-57 ↓ 32-48%, potassium element by 3.4-3.7 ↓ 2.0-2.4%, aluminium element by 13.4-13.9 ↓ 5.5-7.2% feature, control
Point 6 have calcium constituent by 3.2-13.0 ↑ 16.8-34.8%, element silicon by 53-69 ↓ 15-32% feature.
Fig. 3 gives the Geochemistry Parameters early warning control point selection figure using method provided by the invention, and we can from figure
To find out, Weiyuan area Longma small stream group+five shows as gradually rising from top to bottom on peak group TOC contents longitudinal direction, and two sections of TOC of dragon contain
Amount typically in 0.1-0.15% or so, one section of dragon 9., 8. substratum TOC contents 0.2-0.5%, 7. -4. substratum TOC rise rapidly, Fig. 3
It is evident that 7. TOC steps rise substantially in the middle part of substratum at middle B, TOC has 0.4-0.5 ↑ 4-5%, 3. -1.（1. substratum is five
Peak group）Substratum TOC contents are more in 4-9%, average 4.5-5.1%.6. substratum pushes up 10.6m layer by layer away from 5. small at A in Fig. 3；C in Fig. 3
Place is away from the top circle 3m that cores.
Fig. 4 gives the present invention and cored achievement in low exploration activity field area shale gas well, finally completes to core by design requirement,
Reach geological target, save drilling cost.
Above example, beneficial effects of the present invention are convincingly demonstrated：Suitable for the page in different degrees of prospecting area
Rock gas straight well is cored work, can effectively save drilling period, reduce drilling cost.
Claims (5)
- A kind of method that card layer is predicted 1. high-quality shale is cored, it is characterised in that comprise the following steps：（1）Carry out the analysis of Longma small stream group stratum element data information, find the otherness of each upper single element in substratum shale longitudinal direction, The obvious element of longitudinal difference is found out, is cored exercisable element early warning control point during card layer as scene；（2）To work area, drilling well Longma small stream group earth cuttings are seen again, analyze each substratum landwaste color change feelings of Longma small stream group Condition, color change position is found out, as landwaste color early warning control point；（3）Carry out two and open seismic calibration work after end, block quasi- Permian base position, five Feng Zudi circle depth are carried out pre- Survey, according to prediction result, shift to an earlier date rate controlling in prediction specified distance on position of coring, reserve grace time and carry out live judgement；（4）Base area log data, longitudinally upper each substratum Geochemistry Parameters situation of change, searching are mutated analysis and distinguishing on longitudinal direction Position, as Geochemistry Parameters early warning control point；（5）Combining step（1）、（2）、（3）And（4）In element data information, landwaste information, earthquake information, change information, Judge position of coring.
- 2. the method as described in claim 1, it is characterised in that the step of analysis each substratum landwaste color change situation of Longma small stream group In rapid, landwaste color change situation in the range of high-quality 30 meters of shale top is analyzed.
- 3. the method as described in claim 1, it is characterised in that step（3）In, the distance to a declared goal is 15 meters -35 meters.
- 4. method as claimed in claim 3, it is characterised in that step（3）In, the distance to a declared goal is 20 meters, 25 meters or 30 Rice.
- 5. the method as described in claim 1, it is characterised in that step（3）In, step that five Feng Zudi circle depth are predicted Suddenly, using tachometric method according on region Longma small stream group formation interval velocity predict five Feng Zudi circle depth, and, using Thickness Method according to Longma small stream group formation thickness variation tendency calculates Longma small stream group-five peak group thickness by T0 differences in work area, and analysis judges two kinds of sides Whether method result is consistent with regional stratum thickness change situation, and it is prediction result to choose with the closest result of geological knowledge.
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Cited By (1)
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| CN114545507A (en) * | 2020-11-24 | 2022-05-27 | 中国石油天然气股份有限公司 | Coring depth determination method and device, terminal and storage medium |
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Application publication date: 20180316 |