CN105717552A - Method for predicting spatial distribution form of lacustrine beach-bar sand body based on logging curve high-frequency cycle - Google Patents
Method for predicting spatial distribution form of lacustrine beach-bar sand body based on logging curve high-frequency cycle Download PDFInfo
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Abstract
The invention discloses a method for predicting a spatial distribution form of a lacustrine beach-bar sand body based on a logging curve high-frequency cycle. The method comprises the following steps of: 1, carrying out high-frequency cycle division and comparison on a logging curve of a beach-bar development layer section, and establishing a lacustrine high-frequency cycle distribution framework; 2, in the established lacustrine high-frequency cycle distribution framework, analyzing a natural gamma logging curve form of each well or the sand content vertical change explained by logging; 3, according to the change trend of the natural gamma curve or the sand content with the mudstone baseline differences in the vertical direction, analyzing the lifting process relative to a lake level; 4, if the lifting is stable relative to the lake level, depositing beach sand distributed in a mat shape in a lakeside region, and if the lifting is intermittent relative to the lake level, depositing carinate beach sand parallel to a lake shore in the lakeside region; and 5, using inflection points of the logging curve as a boundary of the beach-bar sand body, and carving and predicting the spatial form of the beach-bar sand body. According to the invention, the prediction accuracy is obviously improved.
Description
Technical field
The invention belongs to sandstone reservoir spatial prediction field, basin, be specifically related to a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic.
Background technology
Oil-gas bearing basin ach-bar sandbody elusive reservoir, is the exploration focus of China's Continental Petroliferous Basins in recent years.But the ach-bar sandbody number of plies is many, thickness in monolayer is thin, plane is unstable, vertical thickness changes greatly, spatial distribution complex shape, and this point seriously constrains the exploration and development effect of such oil-gas reservoir.How to predict the spatial of monolayer ach-bar sandbody better, be always up the difficult problem that petroleum geology worker attempts to solve.
The main method adopting seismic properties or Application of Logging-constrained Inversion of prediction of current oil-gas bearing basin sand body spatial shape, grown up again Seismic Sedimentology method in recent years gradually, but these methods are very limited to the precision of prediction of thin layer ach-bar sandbody, and the impact ratio by seismic data quality is more serious.
Summary of the invention
It is an object of the invention to provide a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic.
The adopted technical solution is that:
A kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic, comprises the following steps:
Step one, to dam, beach grow interval log carry out High Frequency Cyclic Division and contrast, set up lacustrine facies High Frequency Cyclic spatial screen work；
Step 2, in the lacustrine facies High Frequency Cyclic spatial screen work set up, analyze the Natural Gamma-ray Logging Curves form of every mouthful of well or the sandy content vertical variations of well log interpretation；
Step 3, according to gamma ray curve or sandy content on vertical with the variation tendency of shale line difference, analyze the lifting process of relative lake level；
If step 4 lake level relatively stably lifts, the beach depositing seat shape spread in Bin Hu area is husky；If lake level intermittence lifting relatively, the carinate beach depositing parallel loke shore in Bin Hu area is husky；
Step 5, using the flex point place of log as the border of ach-bar sandbody, portray and predict the spatial shape of ach-bar sandbody.
In step one, described log adopts Natural Gamma-ray Logging Curves, apparent resistivity logging curve and induction logging curves.
In step one, High Frequency Cyclic interface during described High Frequency Cyclic Division and contrast adopts flood surface, and cycle divides rank based on three grades.
In step, comprising the concrete steps that High Frequency Cyclic divides utilizes Natural Gamma-ray Logging Curves, apparent resistivity logging curve and induction logging curves, accurately being divided into three grades of stratigraphic cycles, cycle interface is flood surface, it is established that around the high frequency well logging cycle screen work of fossil lake bank spread.
In step 2, sandy content more less, Natural Gamma-ray Logging Curves the closer to shale line, represent sedimentary water body more deep；Otherwise, sandy content is more many, Natural Gamma-ray Logging Curves further away from shale line, represent sedimentary water body more shallow, distance loke shore more near, the closer to ach-bar sandbody.
In step 3, described variation tendency is divided into two classes, and the first shows as sedimentary water body on High Frequency Cyclic interface and quickly deepens, on flour sand content continue to increase, the difference of gamma ray curve and shale line continues to strengthen, and represents relative lake level continuous decrease；It two is show as the relatively rapid intensification of sedimentary water body on High Frequency Cyclic interface, on flour sand content significantly do not increase, it is stabilized to close to interface, cycle top always, the content of flour sand just increases to some extent, represent in High Frequency Cyclic deposition process, the connate water profound phase keeps relative stability, until latter stage just shoals to some extent because of thing source progradation.
In step 4, relative lake level with short, determines the thickness of ach-bar sandbody with thin in the length of loke shore area stabilization time；Relative lake level flucuation fast and slow, determining ach-bar sandbody spatial shape is carinate or seat shape.
In step 5, the concrete determination methods on the border of ach-bar sandbody is: log is the closer to ach-bar sandbody, and sandy content is more high, bores the log meeting ach-bar sandbody using flex point place as the border of ach-bar sandbody；Do not bore the log meeting ach-bar sandbody, with the position prediction ach-bar sandbody border that flour sand content substantially increases.
In step 5, the space screen work according to well logging High Frequency Cyclic, the basic distributing position of ach-bar sandbody is pinching place of lacustrine facies High Frequency Cyclic onshore, and seat shape or carinate spatial shape are controlled by the lifting process of relative lake level.
The method have the benefit that:
The invention provides a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic, the method is on the basis of the well logging fine Division and contrast of High Frequency Cyclic screen work, make full use of the change of relative lake level during cyclic sedimentation, and on the basis of ach-bar sandbody deposition rule research, predict the spatial of ach-bar sandbody in each High Frequency Cyclic.The method can not only significantly improve the accuracy of prediction, also has stronger operability simultaneously.And the present invention is with relative lake level change for foundation, from deposition rule, geology combines with well logging means, is possible not only to the ach-bar sandbody spatial shape effectively predicting in High Frequency Cyclic, and also is able to disclose the vertical evolution of ach-bar sandbody between High Frequency Cyclic better.
Accompanying drawing explanation
Fig. 1 is that the present invention predicts the method flow diagram of lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic；
Fig. 2 is the present invention ach-bar sandbody depositional model figure based on relative lake level change；Fig. 2 a illustrates seat shape beach sand pattern；Fig. 2 b illustrates ridge channel-shaped beach sand pattern.
Fig. 3 is the present invention ach-bar sandbody spatial prediction mode figure based on relative lake level change；Fig. 3 a illustrates that seat shape beach is husky；Fig. 3 b illustrates that ridge channel-shaped beach is husky.
Detailed description of the invention
The invention provides a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic, wherein namely so-called log High Frequency Cyclic refers to the shoreline onlap chronostratigraphic architecture that marks off on log.The method is on the basis of the well logging fine Division and contrast of High Frequency Cyclic screen work, with control ach-bar sandbody form relative lake level change process for foundation, from geologic rule, geology combines with well logging means, efficiently solve a difficult problem for thin layer ach-bar sandbody spatial shape prediction, overcome prior art, the poor accuracy that especially seismic prediction technique exists, problem that is random big, that substantially judge by the subjective understanding of explanation personnel.
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic, the method is on the basis of the well logging fine Division and contrast of High Frequency Cyclic screen work, the change procedure of relative lake level is analyzed by the chiltern percentage composition of form of logs or well log interpretation, according to the depositional control effect to ach-bar sandbody of the relative lake level change, it was predicted that judge the spatial form of ach-bar sandbody.Specifically include following steps:
Step one, the log that dam, beach grows interval carry out fine High Frequency Cyclic Division and contrast, and correlation curve adopts the log such as natural gamma, apparent resistivity, sensing, and High Frequency Cyclic interface during contrast adopts flood surface, is accurately divided into three grades of stratigraphic cycles.Through repeatedly contrasting, it is established that around the fine high frequency well logging cycle spatial screen work of fossil lake bank spread.
Step 2, in the lacustrine facies High Frequency Cyclic spatial screen work set up, analyze the Natural Gamma-ray Logging Curves form of every mouthful of well or the sandy content vertical variations of well log interpretation.Sandy content more less, Natural Gamma-ray Logging Curves the closer to shale line, represent sedimentary water body more deep；Otherwise, sandy content is more many, Natural Gamma-ray Logging Curves further away from shale line, represent sedimentary water body more shallow, distance loke shore more near, the closer to ach-bar sandbody.
Step 3, according to gamma ray curve or sandy content on vertical with the variation tendency of shale line difference, analyze the lifting process of relative lake level.This variation tendency can be divided into two classes substantially, the first shows as sedimentary water body on High Frequency Cyclic interface and quickly deepens, on flour sand content continue to increase, the difference of gamma ray curve and shale line continues to strengthen, and represents the relative lake level continuous decrease of deposition period；It two is show as the relatively rapid intensification of sedimentary water body on High Frequency Cyclic interface, but on flour sand content significantly do not increase, it is stabilized to close to interface, cycle top always, the content of flour sand just increases to some extent, represent in High Frequency Cyclic deposition process, relative lake level keeps relative stability for a long time, until cyclic sedimentation just shoals because of thing source progradation latter stage to some extent.
Step 4, based on sedimentary analysis, if relatively lake level is stablized down or up, the beach depositing seat shape spread in Bin Hu area is husky；If lake level intermittence is down or up relatively, deposit the carinate beach husky (being commonly called as dam sand) of parallel loke shore in Bin Hu area.Relative lake level with short, determines the thickness of ach-bar sandbody with thin in the length of loke shore area stabilization time；Relative lake level flucuation fast and slow, determining ach-bar sandbody spatial shape is carinate or seat shape.
Step 5, using the flex point place of log as the border of ach-bar sandbody, portray and predict the spatial shape of ach-bar sandbody.The concrete determination methods on ach-bar sandbody border is: log is the closer to ach-bar sandbody, and sandy content is more high, bores the log meeting ach-bar sandbody using flex point place as the border of ach-bar sandbody；Do not bore the log meeting ach-bar sandbody, with the position prediction ach-bar sandbody border that flour sand content substantially increases.Space screen work according to well logging High Frequency Cyclic, the basic distributing position of ach-bar sandbody is pinching place of lacustrine facies High Frequency Cyclic onshore, and seat shape or carinate spatial shape are controlled by the lifting process of aforementioned relative lake level.
Fig. 2 illustrates the present invention ach-bar sandbody depositional model figure based on relative lake level change.As can be seen from Figure 2, relative lake level stably rises, the seat shape beach sand that loke shore area depositing large-area is stable；Relative lake level intermittent elevation, then lake level relatively stable period wherein, can deposit ribbon or carinate beach is husky in loke shore area.
Fig. 3 illustrates the present invention ach-bar sandbody spatial prediction mode figure based on relative lake level change.Near loke shore on the right side of this figure, growing beach sand (marginal portion of beach sand is silt-sized particle, main part is sand-size particle), include seat shape beach sand and ridge channel-shaped beach sand both of which, each pattern is containing two High Frequency Cyclics.No matter seat shape beach sand, or ridge channel-shaped beach sand, be that sedimentary water body is deepened rapidly on each High Frequency Cyclic interface, and granule is thinner, mud stone is purer.Wherein: (1) seat shape beach sand model shows that the natural gamma curve on interface or flour sand content continue to increase to cycle top, the closer to loke shore, the aleuritic texture content at cycle top increases more obvious, siltstone or sand layers is thin but lateral extent is wide.Seat shape beach sand under this pattern upwards can continue to increase according to natural gamma curve on interface or flour sand content, siltstone or sand layers lateral extent is wide, thin predicts；(2) ridge channel-shaped beach sand model shows that the natural gamma curve on interface or flour sand content keep big section stable, obvious siltstone or sandstone seldom occur at cycle top, but the closer to loke shore, flour sand content overall in cycle is gradually increased, there is argillaceous siltstoue, silty etc. in cycle middle and upper part simultaneously, and thickness is bigger.Ridge channel-shaped beach sand under this pattern can keep big section stable according to natural gamma curve on interface or flour sand content, substantially increase and thickness judges more greatly at aleuritic texture content in the High Frequency Cyclic of carinate beach sand, spatially the lateral extent of beach sand sand body is less, mainly presents carinate along Ancient bank line distribution.
In sum, the present invention utilizes log, by joining well profile, stratum is carried out fine Division and contrast, identifies High Frequency Cyclic, and that sets up High Frequency Cyclic waits time space Stratigraphic framework, and determines Ancient bank line according to High Frequency Cyclic spread trend.Depositing based on modern coast and loke shore and observe, ach-bar sandbody is to be piled up, by wave action, the sand body formed in loke shore area in relative lake level flucuation process.If relatively lake level at the uniform velocity changes, then dam, the beach sand in loke shore area rises or falls relatively evenly large area spread along with relative lake level；If lake level presents intermittently fast lifting relatively, then in the relative lake level fast lifting phase, because sedimentation time is short, the beach sand in loke shore area is very thin or lacks, and at relative lake level stable phase longer subsequently, a large amount of beaches sand can have the time of abundance to be deposited in Bin Hu area, forms narrow and thick ribbon beach rampart (the dam sand namely generally described).Owing to the speed of relative lake level flucuation can be showed by the content of flour sand in lacustrine mud, so the vertical variations essence of flour sand content just reflects the lifting process of relative lake level in lacustrine facies High Frequency Cyclic.
Under this theoretical direction, the natural gamma in log (mainly by under sand mud deposition conditions, tracing pattern is closely related with sandy content) morphological characteristic in lacustrine facies High Frequency Cyclic can be passed through or the spatial form of aleuritic texture content prediction ach-bar sandbody that well log interpretation goes out and development position.
The present invention utilizes the relative lake level change control action to ach-bar sandbody in High Frequency Cyclic screen work, with the well log interpretation achievement of the gamma ray curve form reflecting relative lake level change or aleuritic texture content for means, according to the vertical and cross directional variations trend of flour sand content in lacustrine facies high frequency screen work, spatial shape and the planar distribution of ach-bar sandbody can be predicted more accurately, there is stronger operability, the exploration and development of lacustrine shoal-bar sand body oil-gas reservoir is significant.
The foregoing is only the implementation process of the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (9)
1. the method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic, it is characterised in that comprise the following steps:
Step one, to dam, beach grow interval log carry out High Frequency Cyclic Division and contrast, set up lacustrine facies High Frequency Cyclic spatial screen work；
Step 2, in the lacustrine facies High Frequency Cyclic spatial screen work set up, analyze the Natural Gamma-ray Logging Curves form of every mouthful of well or the sandy content vertical variations of well log interpretation；
Step 3, according to gamma ray curve or sandy content on vertical with the variation tendency of shale line difference, analyze the lifting process of relative lake level；
If step 4 lake level relatively stably lifts, the beach depositing seat shape spread in Bin Hu area is husky；If lake level intermittence lifting relatively, the carinate beach depositing parallel loke shore in Bin Hu area is husky；
Step 5, using the flex point place of log as the border of ach-bar sandbody, portray and predict the spatial shape of ach-bar sandbody.
2. a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic according to claim 1, it is characterized in that, in step one, described log adopts Natural Gamma-ray Logging Curves, apparent resistivity logging curve and induction logging curves.
3. a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic according to claim 1, it is characterized in that, in step one, High Frequency Cyclic interface during described High Frequency Cyclic Division and contrast adopts flood surface, and cycle divides rank based on three grades.
4. a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic according to claim 1, it is characterized in that, in step, comprising the concrete steps that High Frequency Cyclic divides utilizes Natural Gamma-ray Logging Curves, apparent resistivity logging curve and induction logging curves, accurately it is divided into three grades of stratigraphic cycles, cycle interface is flood surface, it is established that around the high frequency well logging cycle screen work of fossil lake bank spread.
5. a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic according to claim 1, it is characterized in that, in step 2, sandy content more less, Natural Gamma-ray Logging Curves the closer to shale line, represent sedimentary water body more deep；Otherwise, sandy content is more many, Natural Gamma-ray Logging Curves further away from shale line, represent sedimentary water body more shallow, distance loke shore more near, the closer to ach-bar sandbody.
6. a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic according to claim 1, it is characterized in that, in step 3, described variation tendency is divided into two classes, the first shows as sedimentary water body on High Frequency Cyclic interface and quickly deepens, on flour sand content continue to increase, the difference of gamma ray curve and shale line continues to strengthen, and represents relative lake level continuous decrease；It two is show as sedimentary water body on High Frequency Cyclic interface quickly to deepen, on flour sand content significantly do not increase, it is stabilized to close to interface, cycle top always, the content of flour sand just increases to some extent, represent in High Frequency Cyclic deposition process, the connate water profound phase keeps relative stability, until latter stage just shoals to some extent because of thing source progradation.
7. a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic according to claim 1, it is characterized in that, in step 4, relative lake level with short, determines the thickness of ach-bar sandbody with thin in the length of loke shore area stabilization time；Relative lake level flucuation fast and slow, determining ach-bar sandbody spatial shape is carinate or seat shape.
8. a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic according to claim 1, it is characterized in that, in step 5, the concrete determination methods on the border of ach-bar sandbody is: log is the closer to ach-bar sandbody, sandy content is more high, bores the log meeting ach-bar sandbody using flex point place as the border of ach-bar sandbody；Do not bore the log meeting ach-bar sandbody, with the position prediction ach-bar sandbody border that flour sand content substantially increases.
9. a kind of method predicting lacustrine shoal-bar sand body spatial form based on log High Frequency Cyclic according to claim 1, it is characterized in that, in step 5, space screen work according to well logging High Frequency Cyclic, the basic distributing position of ach-bar sandbody is pinching place of lacustrine facies High Frequency Cyclic onshore, and seat shape or carinate spatial shape are controlled by the lifting process of relative lake level.
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