CN106481337A - The Forecasting Methodology in Roof bound of super pressure face - Google Patents
The Forecasting Methodology in Roof bound of super pressure face Download PDFInfo
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- CN106481337A CN106481337A CN201510535300.4A CN201510535300A CN106481337A CN 106481337 A CN106481337 A CN 106481337A CN 201510535300 A CN201510535300 A CN 201510535300A CN 106481337 A CN106481337 A CN 106481337A
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Abstract
The invention discloses a kind of Forecasting Methodology in Roof bound of super pressure face, belong to technical field of geological exploration, solve the technical problem that prior art is difficult to effectively identify and predict the Roof bound of super pressure face of sedimentary basin.The Forecasting Methodology in this Roof bound of super pressure face includes：According to drilling-log lithology, select the corresponding log of drilling well mud stone, including shale resistivity and gas logging abnormal；Changed according to drilling depth, to shale resistivity averaged；According to the relation of log and depth, determine Roof bound of super pressure face.
Description
Technical field
The present invention relates to technical field of geological exploration, specifically, it is related to a kind of Forecasting Methodology in Roof bound of super pressure face.
Background technology
Pore-fluid abnormal pressure is the phenomenon of generally existing in sedimentary basin, is also that sedimentary basin internal flow is lived
Factor the most actively, the most active in dynamic, Hydrocarbon accumulation process.The formation of sedimentary basin inner overpressure and drilling
The generation of change process and oil gas, migration, gathering have close relationship, superpressure geologic body and Roof bound of super pressure face
Distribution characteristicss all have important impact to aspects such as Hydrocarbon Formation Reservoirs, drilling engineering and reservoir engineerings.
The identification in the Roof bound of super pressure face of existing sedimentary basin relies primarily on two kinds, geophysical method and geochemical
Method.
Geophysical method relies primarily on comprehensive analysis mud stone interval transit time, mud stone SVEL or seimic wave propagation
The geophysical information such as speed and mud stone density identifies the Roof bound of super pressure face of sedimentary basin.But geophysical method
It is primarily adapted for use in the Meso Cenozoic sedimentary basin that buried depth is relatively shallower, compaction is relatively low, and for early stage
The sedimentary basin (such as Sichuan Basin etc.) that buried depth of strata is relatively large, compaction is of a relatively high, mud stone hole
Gap is filled with or cementing substantially, and mud stone SVEL and mud stone interval transit time are all close to substrate SVEL and substrate
Interval transit time, causes mud stone SVEL and mud stone interval transit time that the superpressure of sedimentary basin is responded inconspicuous.By
Little between mud stone SVEL, mud stone interval transit time or seismic wave propagation speed and mud stone variable density, because
This can not accurately identify Roof bound of super pressure face.
Geochemical method mainly passes through the content of related to thermo hydrodynamic analysis mineral cement thing in formation testing,
Face is delimited according to the changes of contents rule identification basin superpressure of this cement.This geochemical method needs a large amount of
Geochemical testing analysis work, and drilling well sample is difficult to get sufficient amount of sample.
Therefore, prior art is difficult to effectively identify and predict the Roof bound of super pressure face of sedimentary basin.
Content of the invention
It is an object of the invention to provide a kind of Forecasting Methodology in Roof bound of super pressure face, it has been difficult to solving prior art
The technical problem in the Roof bound of super pressure face of effect identification and prediction sedimentary basin.
The present invention provides a kind of Forecasting Methodology in Roof bound of super pressure face, including：
According to drilling-log lithology, select the corresponding log of drilling well mud stone, including shale resistivity and
Gas logging abnormal；
Changed according to drilling depth, to shale resistivity averaged；
According to the relation of log and depth, determine Roof bound of super pressure face.
It is further that described log also includes mud stone interval transit time and mud stone SVEL.
Preferably, described according to drilling depth change, to shale resistivity averaged, specially：
Changed according to drilling depth, every 40 to 60 meters take a point, to shale resistivity averaged.
Preferably, the described relation according to log and depth, determines Roof bound of super pressure face, specially：
Analysis log and the relation of depth, the depth segment that gas logging abnormal and shale resistivity are uprushed simultaneously determines
For Roof bound of super pressure face.
Preferably, methods described is used for the prediction in the Roof bound of super pressure face of sedimentary basin.
Be further, in described sedimentary basin contain one of compact sandstone gas, shale gas, Deep-basin gas or
Multiple.
Present invention offers following beneficial effect：The present invention provides in the Forecasting Methodology in Roof bound of super pressure face, using mud
Rock resistivity and gas logging abnormal are identified to the Roof bound of super pressure face of sedimentary basin and predict, are particularly suited for being compacted
The of a relatively high sedimentary basin of degree.
In overcompaction sedimentary basin, mudstone porosity is low, compaction is of a relatively high, the sky in mudstone stratum
So gas is the principal element that Formation overpressure is formed, so near Roof bound of super pressure face, shale resistivity can abnormal increase
Greatly, very identical with Formation overpressure corresponding relation.Meanwhile, the stratum water in mud stone residual porosity is by natural gas drive
Replace, mud stone hole is filled by natural gas, shale resistivity also can be made to significantly increase.Therefore, deposit basin at such
In ground, shale resistivity and sedimentary basin superpressure have extraordinary response relation.
In addition, be identified using shale resistivity and predict sedimentary basin Roof bound of super pressure face when, must be by
Shale resistivity and gas logging abnormal combine.Under geological conditions, in mud stone, the increase of cement content, also can
Shale resistivity is caused to increase, the exception of this shale resistivity increases and the superpressure of sedimentary basin between not
Direct relation.And gas logging abnormal and shale resistivity show exception simultaneously, then in explanation stratum, natural Gas content increases
Plus and formation resistivity extremely increase, there is shown the appearance in Roof bound of super pressure face.
Other features and advantages of the present invention will illustrate in the following description, and, partial from description
In become apparent, or by implement the present invention and understand.The purpose of the present invention and other advantages can be passed through
In description, claims and accompanying drawing, specifically noted structure is realizing and to obtain.
Brief description
For the technical scheme in the clearer explanation embodiment of the present invention, below will be to required in embodiment description
The accompanying drawing wanted does simple introduction：
Fig. 1 is the flow chart of the Forecasting Methodology 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
To describe embodiments of the present invention below with reference to drawings and Examples in detail, whereby to the present invention how
Application technology means are solving technical problem, and reach realizing process and fully understanding and real according to this of technique effect
Apply.As long as it should be noted that not constituting conflict, in each embodiment in the present invention and each embodiment
Each feature can be combined with each other, and the technical scheme being formed is all within protection scope of the present invention.
The embodiment of the present invention provides a kind of Forecasting Methodology in Roof bound of super pressure face it is adaptable to the Roof bound of super pressure of sedimentary basin
The prediction in face, the sedimentary basin that particularly early stage buried depth of strata is relatively large, compaction is of a relatively high.And,
Contain one or more of compact sandstone gas, shale gas, Deep-basin gas in applying also for, wait conventional, unconventional
The identification in Roof bound of super pressure face of the sedimentary basin of petroleum resources and prediction.
As shown in figure 1, the Forecasting Methodology in Roof bound of super pressure face provided in an embodiment of the present invention includes：
S1：According to drilling-log lithology, select the corresponding log of drilling well mud stone.
According to the data information of drilling-log lithology, the various data informations of drilling well shale layer are arranged, and
Draw out log.Then, then pick out data information needed for the embodiment of the present invention and corresponding log well bent
Line.
Wherein, the gentle survey of the log selected in embodiment of the present invention shale resistivity at least to be included is different
Often.As a preferred version, the log selected in the embodiment of the present invention can also include mud stone sound wave
The time difference and mud stone SVEL.
S2：Changed according to drilling depth, to shale resistivity averaged.
Specifically, changed according to drilling depth, every 40 to 60 meters take a point, and shale resistivity is asked for putting down
Average.Generally, can every 50 meters take a point, and to shale resistivity averaged.
S3：According to the relation of log and depth, determine Roof bound of super pressure face.
Specifically, the relation of analysis log and depth, the depth that gas logging abnormal and shale resistivity are uprushed simultaneously
Degree section is defined as Roof bound of super pressure face.
The embodiment of the present invention taking certain drilling well of Northeastern Sichuan Basin as a example illustrates, as shown in Fig. 2 about
At 3.5km, shale resistivity and gas logging abnormal occur in that abnormal increase simultaneously, so being defined as superpressure top at this
Interface.From figure 2 it can be seen that pressure coefficient in this place also occurs in that abnormal increase, thus demonstrating this
The accuracy of the Forecasting Methodology in Roof bound of super pressure face that inventive embodiments provide.
Near Roof bound of super pressure face, mud stone interval transit time should increase, and mud stone SVEL should reduce.But
It can also be seen that because formation compaction degree is too high from Fig. 2, this drilling well Roof bound of super pressure face mud stone sound wave nearby
The time difference increases and inconspicuous, and mud stone SVEL reduces also inconspicuous, therefore according to mud stone interval transit time and mud stone
SVEL is difficult to effectively identify and predict Roof bound of super pressure face.
In overcompaction sedimentary basin, mudstone porosity is low, compaction is of a relatively high, the sky in mudstone stratum
So gas is the principal element that Formation overpressure is formed, so near Roof bound of super pressure face, shale resistivity can abnormal increase
Greatly, very identical with Formation overpressure corresponding relation.Meanwhile, the stratum water in mud stone residual porosity is by natural gas drive
Replace, mud stone hole is filled by natural gas, shale resistivity also can be made to significantly increase.Therefore, deposit basin at such
In ground, shale resistivity and sedimentary basin superpressure have extraordinary response relation.
In addition, be identified using shale resistivity and predict sedimentary basin Roof bound of super pressure face when, must be by
Shale resistivity and gas logging abnormal combine.Under geological conditions, in mud stone, the increase of cement content, also can
Shale resistivity is caused to increase, the exception of this shale resistivity increases and the superpressure of sedimentary basin between not
Direct relation.And gas logging abnormal and shale resistivity show exception simultaneously, then in explanation stratum, natural Gas content increases
Plus and formation resistivity extremely increase, there is shown the appearance in Roof bound of super pressure face.
The embodiment of the present invention provides in the Forecasting Methodology in Roof bound of super pressure face, using shale resistivity and gas logging abnormal pair
The Roof bound of super pressure face of sedimentary basin is identified and predicts, can effectively predict the Roof bound of super pressure of sedimentary basin
Face, the sedimentary basin that especially early stage buried depth of strata is relatively large, compaction is of a relatively high.Therefore, this
The Forecasting Methodology in the Roof bound of super pressure face that bright embodiment provides can effectively and accurately identify and predict sedimentary basin
Roof bound of super pressure face, is sedimentary basin oil-gas exploration and oil drilling engineering provides foundation and guarantee.
While it is disclosed that embodiment as above, but described content is only to facilitate understand the present invention
And the embodiment adopting, it is not limited to the present invention.Technology people in any the technical field of the invention
Member, on the premise of without departing from spirit and scope disclosed in this invention, can be in the formal and details implemented
On make any modification and change, but the scope of patent protection of the present invention, still must be with appending claims institute
The scope defining is defined.
Claims (6)
1. a kind of Forecasting Methodology in Roof bound of super pressure face is it is characterised in that include：
According to drilling-log lithology, select the corresponding log of drilling well mud stone, including shale resistivity and
Gas logging abnormal；
Changed according to drilling depth, to shale resistivity averaged；
According to the relation of log and depth, determine Roof bound of super pressure face.
2. method according to claim 1 is it is characterised in that described log also includes mud stone sound
The ripple time difference and mud stone SVEL.
3. method according to claim 1 it is characterised in that described according to drilling depth change, right
Shale resistivity averaged, specially：
Changed according to drilling depth, every 40 to 60 meters take a point, to shale resistivity averaged.
4. method according to claim 1 it is characterised in that described according to log and depth
Relation, determines Roof bound of super pressure face, specially：
Analysis log and the relation of depth, the depth segment that gas logging abnormal and shale resistivity are uprushed simultaneously determines
For Roof bound of super pressure face.
5. method according to claim 1 is it is characterised in that methods described is used for the super of sedimentary basin
Bear down on one the prediction at interface.
6. method according to claim 5 is it is characterised in that contain fine and close sand in described sedimentary basin
One or more of rock gas, shale gas, Deep-basin gas.
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Cited By (3)
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|---|---|---|---|---|
| CN108150160A (en) * | 2017-12-21 | 2018-06-12 | 西安石油大学 | The acquiring method of low compaction superpressure in a kind of stratum |
| CN110703328A (en) * | 2019-10-14 | 2020-01-17 | 中海石油(中国)有限公司上海分公司 | Overpressure interface identification method, device, equipment and storage medium |
| CN115680638A (en) * | 2021-07-26 | 2023-02-03 | 中国石油化工股份有限公司 | Method for identifying overpressure top seal layer by utilizing pressure attenuation gradient |
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| EP1064452B1 (en) * | 1998-03-06 | 2005-12-07 | Baker Hughes Incorporated | Formation testing apparatus and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108150160A (en) * | 2017-12-21 | 2018-06-12 | 西安石油大学 | The acquiring method of low compaction superpressure in a kind of stratum |
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| CN110703328A (en) * | 2019-10-14 | 2020-01-17 | 中海石油(中国)有限公司上海分公司 | Overpressure interface identification method, device, equipment and storage medium |
| 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 |
| CN115680638A (en) * | 2021-07-26 | 2023-02-03 | 中国石油化工股份有限公司 | Method for identifying overpressure top seal layer by utilizing pressure attenuation gradient |
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