CN106481337B - The prediction technique in Roof bound of super pressure face - Google Patents
The prediction technique in Roof bound of super pressure face Download PDFInfo
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- CN106481337B CN106481337B CN201510535300.4A CN201510535300A CN106481337B CN 106481337 B CN106481337 B CN 106481337B CN 201510535300 A CN201510535300 A CN 201510535300A CN 106481337 B CN106481337 B CN 106481337B
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Abstract
The invention discloses a kind of prediction techniques in Roof bound of super pressure face, belong to technical field of geological exploration, solve the prior art and are difficult to the technical issues of effectively identifying and predicting the Roof bound of super pressure face of sedimentary basin.The prediction technique in the Roof bound of super pressure face includes: the corresponding log of drilling well mud stone to be selected, including shale resistivity and gas logging abnormal according to drilling-log lithology；Changed according to drilling depth, to shale resistivity averaged；According to the relationship of log and depth, Roof bound of super pressure face is determined.
Description
Technical field
The present invention relates to technical field of geological exploration, specifically, are related to a kind of prediction technique in Roof bound of super pressure face.
Background technique
Pore-fluid abnormal pressure be phenomenon generally existing in sedimentary basin and the activity of sedimentary basin internal flow,
The most positive, factor the most active in Hydrocarbon accumulation process.The formation of sedimentary basin inner overpressure and evolutionary process and oil gas
Generation, migration, aggregation have a close relationship, the distribution characteristics in superpressure geologic body and Roof bound of super pressure face to Hydrocarbon Formation Reservoirs, bore
Well engineering and reservoir engineering etc. have important influence.
The identification in the Roof bound of super pressure face of existing sedimentary basin relies primarily on two kinds, geophysical method and geochemistry side
Method.
Geophysical method relies primarily on comprehensive analysis mud stone interval transit time, mud stone acoustic speed or seismic wave propagation speed
The Roof bound of super pressure face of sedimentary basin is identified with geophysical informations such as mud stone density.However geophysical method is primarily adapted for use in and buries
Deep Meso Cenozoic sedimentary basin relatively shallower, compaction is relatively low, and, pressure relatively large for early stage buried depth of strata
The relatively high sedimentary basin of real degree (such as the Sichuan Basin etc.), mud stone hole is filled with substantially or cementing, mud stone sound wave speed
Degree and mud stone interval transit time are close to matrix acoustic speed and matrix interval transit time, when causing mud stone acoustic speed and mud stone sound wave
Difference is unobvious to the superpressure response of sedimentary basin.Due to mud stone acoustic speed, mud stone interval transit time or seismic wave propagation speed with
It is little between mud stone variable density, therefore Roof bound of super pressure face cannot be accurately identified.
Geochemical method mainly passes through the content of mineral cement object relevant to thermo hydrodynamic analysis in formation testing, according to
The changes of contents rule identification basin superpressure of the cement delimits face.This geochemical method needs a large amount of geochemistry to survey
Examination analysis work, and drilling well sample is difficult to get sufficient amount of sample.
Therefore, the prior art is difficult to effectively identify and predict the Roof bound of super pressure face of sedimentary basin.
Summary of the invention
The purpose of the present invention is to provide a kind of prediction techniques in Roof bound of super pressure face, are difficult to effectively know to solve the prior art
The technical issues of not and predicting the Roof bound of super pressure face of sedimentary basin.
The present invention provides a kind of prediction technique in Roof bound of super pressure face, comprising:
According to drilling-log lithology, the corresponding log of drilling well mud stone is selected, including the gentle survey of shale resistivity
It is abnormal；
Changed according to drilling depth, to shale resistivity averaged；
According to the relationship of log and depth, Roof bound of super pressure face is determined.
Further, the log further includes mud stone interval transit time and mud stone acoustic speed.
Preferably, described to be changed according to drilling depth, to shale resistivity averaged, specifically:
Changed according to drilling depth, every 40 to 60 meters take a point, to shale resistivity averaged.
Preferably, the relationship according to log and depth, determines Roof bound of super pressure face, specifically:
The relationship of log and depth is analyzed, gas logging abnormal is determined as surpassing with the depth segment that shale resistivity is uprushed simultaneously
Bear down on one interface.
Preferably, prediction of the method for the Roof bound of super pressure face of sedimentary basin.
Further, containing one of compact sandstone gas, shale gas, Deep-basin gas or a variety of in the sedimentary basin.
Present invention offers it is following the utility model has the advantages that the present invention provide Roof bound of super pressure face prediction technique in, utilize mud stone electricity
Resistance rate and gas logging abnormal are identified and are predicted to the Roof bound of super pressure face of sedimentary basin, and it is relatively high to be particularly suitable for compaction
Sedimentary basin.
In overcompaction sedimentary basin, mudstone porosity is low, compaction is relatively high, and the natural gas in mudstone stratum is
The principal element that Formation overpressure is formed, so shale resistivity can increase extremely near Roof bound of super pressure face, with Formation overpressure phase
It should be related to and coincide very much.Meanwhile the water flooding in mud stone residual porosity is replaced by natural gas drive, mud stone hole is filled by natural gas,
Also shale resistivity can be made to significantly increase.Therefore, in such sedimentary basin, shale resistivity and sedimentary basin superpressure have very
Good response relation.
In addition, having to when the Roof bound of super pressure face of sedimentary basin is identified and predicted using shale resistivity by mud stone
Resistivity and gas logging abnormal combine.Under geological conditions, the increase of cement content, will also result in shale resistivity in mud stone
Increase, there is no direct relations between the abnormal increase of this shale resistivity and the superpressure of sedimentary basin.And gas logging abnormal with
Shale resistivity shows exception simultaneously, then illustrates that natural Gas content increases in stratum and formation resistivity increases extremely, there is shown
The appearance in Roof bound of super pressure face.
Other features and advantages of the present invention will be illustrated in the following description, also, partial becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
It, below will be to required in embodiment description for the clearer technical solution illustrated in the embodiment of the present invention
Attached drawing does simple introduction:
Fig. 1 is the flow chart of the prediction technique in Roof bound of super pressure face provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram of various logs and pressure coefficient in the embodiment of the present invention.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technical effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each feature in each embodiment and each embodiment in the present invention can be combined with each other,
It is within the scope of the present invention to be formed by technical solution.
The embodiment of the present invention provides a kind of prediction technique in Roof bound of super pressure face, the Roof bound of super pressure face suitable for sedimentary basin
Prediction, the sedimentary basin that especially early stage buried depth of strata is relatively large, compaction is relatively high.Also, contain in applying also for
Have one of compact sandstone gas, shale gas, Deep-basin gas or a variety of, wait routines, unconventional petroleum resources sedimentary basin it is super
Bear down on one the identification and prediction at interface.
As shown in Figure 1, the prediction technique in Roof bound of super pressure face provided in an embodiment of the present invention includes:
S1: according to drilling-log lithology, the corresponding log of drilling well mud stone is selected.
According to the data information of drilling-log lithology, the various data informations of drilling well shale layer are arranged, and are drawn
Log out.Then data information and corresponding log needed for picking out the embodiment of the present invention then,.
Wherein, the log selected in the embodiment of the present invention at least will include shale resistivity and gas logging abnormal.Make
For a preferred embodiment, the log selected in the embodiment of the present invention can also include mud stone interval transit time and mud stone sound wave
Speed.
S2: changing according to drilling depth, to shale resistivity averaged.
Specifically, being changed according to drilling depth, every 40 to 60 meters take a point, to shale resistivity averaged.One
As in the case of, a point can be taken with every 50 meters, and to shale resistivity averaged.
S3: according to the relationship of log and depth, Roof bound of super pressure face is determined.
Specifically, the depth segment that the relationship of analysis log and depth, gas logging abnormal and shale resistivity are uprushed simultaneously
It is determined as Roof bound of super pressure face.
The embodiment of the present invention is illustrated by taking certain drilling well of Northeastern Sichuan Basin as an example, as shown in Fig. 2, in about 3.5km
There is abnormal increase simultaneously in place, shale resistivity and gas logging abnormal, so being determined as Roof bound of super pressure face at this.It can from Fig. 2
To find out, also there is abnormal increase in the pressure coefficient at this, to demonstrate Roof bound of super pressure provided in an embodiment of the present invention
The accuracy of the prediction technique in face.
Near Roof bound of super pressure face, mud stone interval transit time should increase, and mud stone acoustic speed should reduce.However from Fig. 2
In it can also be seen that due to formation compaction degree it is excessively high, the drilling well Roof bound of super pressure face nearby mud stone interval transit time increase simultaneously it is unknown
Aobvious, the reduction of mud stone acoustic speed is also unobvious, therefore is difficult to effectively identify according to mud stone interval transit time and mud stone acoustic speed
With prediction Roof bound of super pressure face.
In overcompaction sedimentary basin, mudstone porosity is low, compaction is relatively high, and the natural gas in mudstone stratum is
The principal element that Formation overpressure is formed, so shale resistivity can increase extremely near Roof bound of super pressure face, with Formation overpressure phase
It should be related to and coincide very much.Meanwhile the water flooding in mud stone residual porosity is replaced by natural gas drive, mud stone hole is filled by natural gas,
Also shale resistivity can be made to significantly increase.Therefore, in such sedimentary basin, shale resistivity and sedimentary basin superpressure have very
Good response relation.
In addition, having to when the Roof bound of super pressure face of sedimentary basin is identified and predicted using shale resistivity by mud stone
Resistivity and gas logging abnormal combine.Under geological conditions, the increase of cement content, will also result in shale resistivity in mud stone
Increase, there is no direct relations between the abnormal increase of this shale resistivity and the superpressure of sedimentary basin.And gas logging abnormal with
Shale resistivity shows exception simultaneously, then illustrates that natural Gas content increases in stratum and formation resistivity increases extremely, there is shown
The appearance in Roof bound of super pressure face.
The embodiment of the present invention is provided in the prediction technique in Roof bound of super pressure face, using shale resistivity and gas logging abnormal to deposition
The Roof bound of super pressure face in basin is identified and is predicted, can effectively predict the Roof bound of super pressure face of sedimentary basin, especially early stage
The sedimentary basin that buried depth of strata is relatively large, compaction is relatively high.Therefore, Roof bound of super pressure face provided in an embodiment of the present invention
Prediction technique effectively and accurately can identify and predict the Roof bound of super pressure face of sedimentary basin, be sedimentary basin oil-gas exploration and stone
Oily drilling project provides foundation and guarantee.
While it is disclosed that embodiment content as above but described only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (4)
1. a kind of prediction technique in Roof bound of super pressure face characterized by comprising
According to drilling-log lithology, the corresponding log of drilling well mud stone is selected, including shale resistivity and gas logging abnormal；
Changed according to drilling depth, to shale resistivity averaged；
According to the relationship of log and depth, Roof bound of super pressure face is determined, specifically: the relationship of analysis log and depth,
The depth segment that gas logging abnormal and shale resistivity are uprushed simultaneously is determined as Roof bound of super pressure face；
Wherein, prediction of the method for the Roof bound of super pressure face of overcompaction sedimentary basin.
2. the method according to claim 1, wherein the log further includes mud stone interval transit time and mud stone
Acoustic speed.
3. asking the method according to claim 1, wherein described change according to drilling depth shale resistivity
It is averaged, specifically:
Changed according to drilling depth, every 40 to 60 meters take a point, to shale resistivity averaged.
4. the method according to claim 1, wherein in the sedimentary basin containing compact sandstone gas, shale gas,
One of Deep-basin gas is a variety of.
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| CN108150160B (en) * | 2017-12-21 | 2021-07-06 | 西安石油大学 | Method for solving under-compaction and over-pressure in stratum |
| CN110703328B (en) * | 2019-10-14 | 2021-09-24 | 中海石油(中国)有限公司上海分公司 | Overpressure interface identification method, device, equipment and storage medium |
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| EP1064452B1 (en) * | 1998-03-06 | 2005-12-07 | Baker Hughes Incorporated | Formation testing apparatus and method |
| CN102518430A (en) * | 2011-12-21 | 2012-06-27 | 中国石油天然气集团公司 | Method and device for evaluating properties of stratum interface near to well bottom on basis of impact method |
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2015
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|---|---|---|---|---|
| US4341266A (en) * | 1980-09-15 | 1982-07-27 | Lynes, Inc. | Pressure operated test tool |
| EP1064452B1 (en) * | 1998-03-06 | 2005-12-07 | Baker Hughes Incorporated | Formation testing apparatus and method |
| CN102518430A (en) * | 2011-12-21 | 2012-06-27 | 中国石油天然气集团公司 | Method and device for evaluating properties of stratum interface near to well bottom on basis of impact method |
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