CN106761728B - A kind of recognition methods of the advantageous interval of marine facies shale formation - Google Patents
A kind of recognition methods of the advantageous interval of marine facies shale formation Download PDFInfo
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- CN106761728B CN106761728B CN201710079042.2A CN201710079042A CN106761728B CN 106761728 B CN106761728 B CN 106761728B CN 201710079042 A CN201710079042 A CN 201710079042A CN 106761728 B CN106761728 B CN 106761728B
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- 208000035126 Facies Diseases 0.000 title claims abstract description 148
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 145
- 238000000034 method Methods 0.000 title claims abstract description 47
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 claims abstract description 147
- 229910052770 Uranium Inorganic materials 0.000 claims abstract description 111
- 239000003079 shale oil Substances 0.000 abstract description 10
- 241001269238 Data Species 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 18
- 239000005416 organic matter Substances 0.000 description 9
- 229910001748 carbonate mineral Inorganic materials 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Engineering & Computer Science (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The present invention provides a kind of recognition methods of advantageous interval of marine facies shale formation, comprising: obtains the first log data of marine facies shale formation, and marine facies shale formation is divided into rich uranium interval, uranium-bearing interval and depleted uranium interval according to the first log data；The second log data of marine facies shale formation is obtained again, and marine facies shale formation is divided by high resistivity interval, middle resistivity interval and low-resistivity interval according to the second log data；Rich uranium interval, uranium-bearing interval and the depleted uranium interval and high resistivity interval, middle resistivity interval and low-resistivity interval finally divided according to marine facies shale formation, determines the advantageous interval of marine facies shale formation.The present invention identifies the advantageous interval of marine facies shale formation by two kinds of log datas, required data are less and easy acquisition, identification process is simple, quick, solves in the prior art the problem of acquisition data are more, calculating process is complex, calculating cycle is too long, are unfavorable for the timely exploitation of shale oil gas.
Description
Technical field
The present invention relates to unconventional oil and gas exploration and development technical field more particularly to a kind of advantageous intervals of marine facies shale formation
Recognition methods.
Background technique
In recent years, with the development of unconventional petroleum resources, shale oil gas is increasingly becoming unconventional petroleum resources exploitation
Major fields.Shale is marine facies shale, terrestrial facies shale according to sedimentary facies division, and wherein marine facies shale has extensive point in China
Cloth, the advantageous interval of marine facies shale formation refer in marine facies shale formation that hydrocarbon content is higher, have the stratomere of extraction value,
And how to identify that the advantageous interval of marine facies shale formation has become urgent problem to be solved in shale oil gas Resource Development Process,.
Currently, the method for the advantageous interval of prior art identification marine facies shale formation is mainly by establishing geologic interpretation mould
Type identifies the advantageous interval of marine facies shale formation, but this mode needs a large amount of, comprehensive original geologic data, calculates
Process is complex, calculating cycle is too long, is unfavorable for the timely exploitation of shale oil gas.
Summary of the invention
The present invention provides a kind of recognition methods of advantageous interval of marine facies shale formation, to solve acquisition of the existing technology
The problem of data are more, calculating process is complex, calculating cycle is too long, are unfavorable for the timely exploitation of shale oil gas.
The present invention provides a kind of recognition methods of advantageous interval of marine facies shale formation, comprising:
Obtain the first log data of marine facies shale formation；
The marine facies shale formation is divided into rich uranium interval, uranium-bearing interval and depleted uranium according to first log data
Interval；
Obtain the second log data of the marine facies shale formation；
According to second log data by the marine facies shale formation divide high resistivity interval, middle resistivity interval with
And low-resistivity interval；
Rich uranium interval, uranium-bearing interval and the depleted uranium interval and high resistivity layer divided according to the marine facies shale formation
Section, middle resistivity interval and low-resistivity interval, determine the advantageous interval of the marine facies shale formation.
Optionally, first log data is uranium element log data；Correspondingly, described according to the first well logging number
Rich uranium interval, uranium-bearing interval and depleted uranium interval are divided into according to by the marine facies shale formation, comprising: when uranium element log data
Well logging numerical value when being greater than the first preset value, determine the corresponding stratomere of the marine facies shale formation for rich uranium interval；When uranium member
The well logging numerical value of plain log data determines the marine facies shale formation less than the first preset value and when being greater than the second preset value
Corresponding stratomere is uranium-bearing interval；When the well logging numerical value of uranium element log data is less than the second preset value, the sea is determined
The corresponding stratomere of phase shale formation is depleted uranium interval.
Optionally, first log data is for natural gamma GR log data and without uranium GR log data；Correspondingly, institute
It states and the marine facies shale formation is divided by rich uranium interval, uranium-bearing interval and depleted uranium interval according to first log data,
It include: the well logging numerical difference for calculating the GR log data and no uranium GR log data；When the well logging numerical difference is greater than first
When preset value, determine the corresponding stratomere of the marine facies shale formation for rich uranium interval；When the well logging numerical difference is less than first
Preset value and be greater than the second preset value when, determine the corresponding stratomere of the marine facies shale formation be uranium-bearing interval；Work as institute
When stating well logging numerical difference less than the second preset value, determine that the corresponding stratomere of the marine facies shale formation is depleted uranium interval.
Optionally, second log data is Electric Log Data；Correspondingly, described according to the second well logging number
High resistivity interval, middle resistivity interval and low-resistivity interval are divided according to by the marine facies shale formation, comprising: when described
When the well logging numerical value of Electric Log Data is greater than third preset value, determine the corresponding stratomere of the marine facies shale formation for height
Resistivity interval；When the well logging numerical value of the Electric Log Data is less than third preset value and is greater than four preset values, really
Determining the corresponding stratomere of the marine facies shale formation is middle resistivity interval；When the well logging numerical value of the Electric Log Data is small
In the 4th preset value, determine that the corresponding stratomere of the marine facies shale formation is low-resistivity interval.
Optionally, first preset value is 60API, and second preset value is 35API.
Optionally, the third preset value is 20 ohm meters, and the 4th preset value is 2 ohm meters.
Optionally, it is described according to the marine facies shale formation divide rich uranium interval, uranium-bearing interval and depleted uranium interval with
High resistivity interval, middle resistivity interval and low-resistivity interval determine the advantageous interval of the marine facies shale formation, packet
It includes:
When the corresponding stratomere of the marine facies shale formation is rich uranium interval while being high resistivity interval, described in determination
The corresponding stratomere of marine facies shale formation is the advantageous interval of the first kind；
When the corresponding stratomere of the marine facies shale formation is rich uranium interval while being middle resistivity interval, described in determination
The corresponding stratomere of marine facies shale formation is the advantageous interval of the second class；
When the corresponding stratomere of the marine facies shale formation is rich uranium interval while being low-resistivity interval, described in determination
The corresponding stratomere of marine facies shale formation is the advantageous interval of third class.
From the embodiment of the present invention it is found that the present invention by obtain marine facies shale formation the first log data, and according to
Marine facies shale formation is divided into rich uranium interval, uranium-bearing interval and depleted uranium interval by the first log data；Marine facies shale is obtained again
Second log data on stratum, and marine facies shale formation is divided by high resistivity interval, middle resistivity according to the second log data
Interval and low-resistivity interval；Rich uranium interval, uranium-bearing interval and the depleted uranium interval finally divided according to marine facies shale formation
With high resistivity interval, middle resistivity interval and low-resistivity interval, the advantageous interval of marine facies shale formation is determined, the present invention
Identifying the advantageous interval of marine facies shale formation by two kinds of log datas, required data are less and easy acquisition, identification process is simple,
Quickly, it solves in the prior art that calculating process is complex, calculating cycle is too long, is unfavorable for developing in time for shale oil gas
Problem.
Detailed description of the invention
Fig. 1 is a kind of process signal of the recognition methods of advantageous interval of marine facies shale formation shown in an exemplary embodiment
Figure；
Fig. 2 is that a kind of process of the recognition methods of advantageous interval of marine facies shale formation shown in another exemplary embodiment is shown
It is intended to；
Fig. 3 is that a kind of process of the recognition methods of advantageous interval of marine facies shale formation shown in another exemplary embodiment is shown
It is intended to.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Technical term " first ", " second " in the specification and claims of the embodiment of the present invention etc. are for distinguishing
Similar object, without for describing specific sequence precedence.It should be understood that the data used in this way are in appropriate situation
Under can be interchanged, so that the embodiment of the present invention described herein can be other than those of illustrating or describing herein
Sequence is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover those non-exclusive packets
Contain, for example, what the process, method, system, product or equipment for containing a series of steps or units were not necessarily limited to be clearly listed
Those step or units, but may include be not clearly listed or for these process, method, system, product or equipment
Other intrinsic step or units.
Fig. 1 is a kind of process signal of the recognition methods of advantageous interval of marine facies shale formation shown in an exemplary embodiment
Figure, the present embodiment include:
Step 101: obtaining the first log data of marine facies shale formation.
Wherein, the first log data is conventional log data, and source can be a large amount of well loggings of Logging Company's offer
It is one or more in data.
Step 102: marine facies shale formation is divided by rich uranium interval, uranium-bearing interval and depleted uranium according to the first log data
Interval.
Specifically, it is compared according to the first log data and pre-set one group of reference value, by marine facies shale formation
Carry out the division of rich uranium interval, uranium-bearing interval and depleted uranium interval.
Wherein, in organic matter of the main preservation of shale oil gas in shale, the content of uranium element characterizes marine facies shale formation
In abundance of organic matter, the content of organic matter of the high marine facies shale formation section of uranium element content is high, corresponding marine facies shale
The content of organic matter of interval is also higher, also more has the potentiality of the advantageous interval as oily.
Step 103: obtaining the second log data of marine facies shale formation.
Wherein, the second log data is conventional log data, and source can be a large amount of well loggings of Logging Company's offer
One of data are a variety of.
Step 104: marine facies shale formation is divided by high resistivity interval, middle resistivity interval according to the second log data
And low-resistivity interval.
Specifically, it is compared according to the second log data and pre-set another group of reference value, by marine facies shale
Layer carries out the division of high resistivity interval, middle resistivity interval and low-resistivity interval.
Wherein, the resistivity of carbonate mineral is higher, and the presence of natural gas also results in resistivity raising in shale, so
The high stratomere of resistivity is the stratomere that carbonate mineral content is high or shale gas-bearing property is high in marine facies shale formation,
The high stratomere of the high shale gas-bearing property of resistivity has the potentiality as advantageous interval in middle marine facies shale formation.
Step 105: rich uranium interval, uranium-bearing interval and the depleted uranium interval and high resistivity divided according to marine facies shale formation
Interval, middle resistivity interval and low-resistivity interval, determine the advantageous interval of marine facies shale formation.
Specifically, organic matter provides reservoir space for shale gas, but high organic content is not meant to shale gassiness
Property one set, excessively high maturity will lead to shale and preserve ability decline, and poor preservation condition also results in shale gas and scatters and disappears,
So needing further to be judged with resistivity the gas-bearing property of rich uranium shale, simultaneously as carbonate mineral content height means have
Machine matter abundance is low, by uranium element log it is found that the high marine facies shale formation section of carbonate mineral content is depleted uranium interval,
The interval that the content of uranium element element is high and Electric Log Data is high becomes marine facies since the content of organic matter is high, gas-bearing property is good
The advantageous interval of shale formation.
From above-described embodiment it is found that the present invention passes through the first log data for obtaining marine facies shale formation, and according to first
Marine facies shale formation is divided into rich uranium interval, uranium-bearing interval and depleted uranium interval by log data；Marine facies shale formation is obtained again
The second log data, and according to the second log data by marine facies shale formation divide high resistivity interval, middle resistivity interval
And low-resistivity interval；Rich uranium interval, uranium-bearing interval and the depleted uranium interval and height finally divided according to marine facies shale formation
Resistivity interval, middle resistivity interval and low-resistivity interval, determine the advantageous interval of marine facies shale formation, and the present invention passes through
The advantageous interval of two kinds of log datas identification marine facies shale formation, required data are less and easy acquisition, identification process are simple, fast
Speed, solve in the prior art obtain data it is more, calculating process is complex, calculating cycle is too long, be unfavorable for shale oil gas
Timely exploitation the problem of.
In one example, above-mentioned first log data is uranium element log data, correspondingly, according to the first log data
Marine facies shale formation is divided into the process of rich uranium interval, uranium-bearing interval and depleted uranium interval, comprising:
When the well logging numerical value of uranium element log data is greater than the first preset value, the corresponding stratum of marine facies shale formation is determined
Duan Weifu uranium interval；
When the well logging numerical value of uranium element log data is less than the first preset value and is greater than the second preset value, marine facies page is determined
The corresponding stratomere in rock stratum is uranium-bearing interval；
When the well logging numerical value of uranium element log data is less than the second preset value, the corresponding stratum of marine facies shale formation is determined
Section is depleted uranium interval.
Fig. 2 is that a kind of process of the recognition methods of advantageous interval of marine facies shale formation shown in another exemplary embodiment is shown
It is intended to, on the basis of the above embodiments, the first log data, should for natural gamma GR log data and without uranium GR log data
Method includes:
Step 201: obtaining the natural gamma GR log data of marine facies shale formation and without uranium GR log data.
Wherein, natural gamma GR log data and the well logging numerical value unit without uranium GR log data are API.
Step 202: calculating the well logging numerical difference of GR log data and no uranium GR log data.
Wherein, GR log data characterizes the content of all radioactive elements in marine facies shale formation, no uranium GR log data
Characterize the Content for not including the radioactive element of uranium element in marine facies shale formation, GR log data and no uranium GR well logging number
According to well logging numerical difference characterize the contents of all uranium elements in phase shale formation.
Step 203: when the well logging numerical value of uranium element log data is greater than the first preset value, determining marine facies shale formation pair
The stratomere answered is rich uranium interval.
Step 204: when the well logging numerical value of uranium element log data is less than the first preset value and is greater than the second preset value, really
Phase shale formation corresponding stratomere in Dinghai is uranium-bearing interval.
Step 205: when the well logging numerical value of uranium element log data is less than the second preset value, determining marine facies shale formation pair
The stratomere answered is depleted uranium interval.
Step 206: obtaining the second log data of marine facies shale formation.
Step 207: marine facies shale formation is divided by high resistivity interval, middle resistivity interval according to the second log data
And low-resistivity interval.
Step 208: rich uranium interval, uranium-bearing interval and the depleted uranium interval and high resistivity divided according to marine facies shale formation
Interval, middle resistivity interval and low-resistivity interval, determine the advantageous interval of marine facies shale formation.
In one example, the first preset value is 60API, and the second preset value is 35API.
From above-described embodiment it is found that the present invention passes through the first log data for obtaining marine facies shale formation, and according to first
Marine facies shale formation is divided into rich uranium interval, uranium-bearing interval and depleted uranium interval by log data；Marine facies shale formation is obtained again
The second log data, and according to the second log data by marine facies shale formation divide high resistivity interval, middle resistivity interval
And low-resistivity interval；Rich uranium interval, uranium-bearing interval and the depleted uranium interval and height finally divided according to marine facies shale formation
Resistivity interval, middle resistivity interval and low-resistivity interval, determine the advantageous interval of marine facies shale formation, and the present invention passes through
The advantageous interval of two kinds of log datas identification marine facies shale formation, required data are less and easy acquisition, identification process are simple, fast
Speed, solve in the prior art obtain data it is more, calculating process is complex, calculating cycle is too long, be unfavorable for shale oil gas
Timely exploitation the problem of.
Fig. 3 is that a kind of process of the recognition methods of advantageous interval of marine facies shale formation shown in another exemplary embodiment is shown
It is intended to, on the basis of the above embodiments, the second log data is Electric Log Data, this method comprises:
Step 301: obtaining the first log data of marine facies shale formation.
Step 302: marine facies shale formation is divided by rich uranium interval, uranium-bearing interval and depleted uranium according to the first log data
Interval.
Step 303: obtaining the Electric Log Data of marine facies shale formation.
Wherein, resistivity logging can be conventional electrical survey (ES), be also possible to laterolog or induction logging.Resistivity
The unit ohm meter of the well logging numerical value of well logging.
Step 304: when the well logging numerical value of Electric Log Data is greater than third preset value, determining marine facies shale formation pair
The stratomere answered is high resistivity interval.
Step 305: when the well logging numerical value of Electric Log Data is less than third preset value and is greater than four preset values, really
Phase shale formation corresponding stratomere in Dinghai is middle resistivity interval；
Step 306: when the well logging numerical value of Electric Log Data is less than the 4th preset value, determining that marine facies shale formation is corresponding
Stratomere be low-resistivity interval.
Step 307: rich uranium interval, uranium-bearing interval and the depleted uranium interval and high resistivity divided according to marine facies shale formation
Interval, middle resistivity interval and low-resistivity interval, determine the advantageous interval of marine facies shale formation.
In one example, third preset value is 20 ohm meters, and the 4th preset value is 2 ohm meters.
From above-described embodiment it is found that the present invention passes through the first log data for obtaining marine facies shale formation, and according to first
Marine facies shale formation is divided into rich uranium interval, uranium-bearing interval and depleted uranium interval by log data；Marine facies shale formation is obtained again
The second log data, and according to the second log data by marine facies shale formation divide high resistivity interval, middle resistivity interval
And low-resistivity interval；Rich uranium interval, uranium-bearing interval and the depleted uranium interval and height finally divided according to marine facies shale formation
Resistivity interval, middle resistivity interval and low-resistivity interval, determine the advantageous interval of marine facies shale formation, and the present invention passes through
The advantageous interval of two kinds of log datas identification marine facies shale formation, required data are less and easy acquisition, identification process are simple, fast
Speed, solve in the prior art obtain data it is more, calculating process is complex, calculating cycle is too long, be unfavorable for shale oil gas
Timely exploitation the problem of.
In one example, rich uranium interval, uranium-bearing interval and the depleted uranium interval and height divided according to marine facies shale formation
Resistivity interval, middle resistivity interval and low-resistivity interval determine the process of the advantageous interval of marine facies shale formation, packet
It includes:
When the corresponding stratomere of marine facies shale formation is rich uranium interval while being high resistivity interval, marine facies shale is determined
The corresponding stratomere in stratum is the advantageous interval of the first kind；
When the corresponding stratomere of marine facies shale formation is rich uranium interval while being middle resistivity interval, marine facies shale is determined
The corresponding stratomere in stratum is the advantageous interval of the second class；
When the corresponding stratomere of marine facies shale formation is rich uranium interval while being low-resistivity interval, marine facies shale is determined
The corresponding stratomere in stratum is the advantageous interval of third class.
Wherein, the advantageous interval of the first kind illustrates that its abundance of organic matter content is high, oil for rich uranium interval, high resistivity interval
Gas content is high；The advantageous interval of second class is uranium-bearing interval, high resistivity interval, illustrates that its abundance of organic matter content is high, oil gas contains
It measures medium；The advantageous interval of third class is depleted uranium interval, high resistivity interval, illustrates that its abundance of organic matter content is high, hydrocarbon content
It is low；It is divided according to advantageous interval of the hydrocarbon content size to the corresponding stratomere of marine facies shale formation: advantageous interval > the of the first kind
The advantageous interval of the two classes > advantageous interval of third class.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (6)
1. a kind of recognition methods of the advantageous interval of marine facies shale formation characterized by comprising
Obtain the first log data of marine facies shale formation；
The marine facies shale formation is divided into rich uranium interval, uranium-bearing interval and depleted uranium layer according to first log data
Section；
Obtain the second log data of the marine facies shale formation；Wherein, second log data is Electric Log Data；
According to second log data by the marine facies shale formation be divided into high resistivity interval, middle resistivity interval and
Low-resistivity interval；
According to the marine facies shale formation divide rich uranium interval, uranium-bearing interval and depleted uranium interval and high resistivity interval, in
Resistivity interval and low-resistivity interval determine the advantageous interval of the marine facies shale formation；
Wherein, first log data is for natural gamma GR log data and without uranium GR log data；
It is described that the marine facies shale formation is divided by rich uranium interval, uranium-bearing interval and depleted uranium according to first log data
Interval, comprising:
Calculate the well logging numerical difference of the GR log data with no uranium GR log data；
When the well logging numerical difference is greater than the first preset value, determine the corresponding stratomere of the marine facies shale formation for rich uranium layer
Section；
When the well logging numerical difference is less than the first preset value and is greater than the second preset value, the marine facies shale formation is determined
Corresponding stratomere is uranium-bearing interval；
When the well logging numerical difference is less than the second preset value, determine that the corresponding stratomere of the marine facies shale formation is depleted uranium layer
Section.
2. the method according to claim 1, wherein first log data is uranium element log data；
Correspondingly, described be divided into rich uranium interval, uranium-bearing interval for the marine facies shale formation according to first log data
And depleted uranium interval, comprising:
When the well logging numerical value of uranium element log data is greater than the first preset value, the corresponding stratum of the marine facies shale formation is determined
Duan Weifu uranium interval；
When the well logging numerical value of uranium element log data is less than the first preset value and is greater than the second preset value, the sea is determined
The corresponding stratomere of phase shale formation is uranium-bearing interval；
When the well logging numerical value of uranium element log data is less than the second preset value, the corresponding stratum of the marine facies shale formation is determined
Section is depleted uranium interval.
3. method according to claim 1 or 2, which is characterized in that it is described according to second log data by the sea
Phase shale formation divides high resistivity interval, middle resistivity interval and low-resistivity interval, comprising:
When the well logging numerical value of the Electric Log Data is greater than third preset value, determine that the marine facies shale formation is corresponding
Stratomere is high resistivity interval；
When the well logging numerical value of the Electric Log Data is less than third preset value and is greater than four preset values, the sea is determined
The corresponding stratomere of phase shale formation is middle resistivity interval；
When the well logging numerical value of the Electric Log Data is less than the 4th preset value, the marine facies shale formation is determined correspondingly
Interval is low-resistivity interval.
4. according to the method described in claim 2, described second is default it is characterized in that, first preset value is 60 API
Value is 35API.
5. according to the method described in claim 3, it is characterized in that, the third preset value be 20 ohm meters, the described 4th
Preset value is 2 ohm meters.
6. according to the method described in claim 3, it is characterized in that, the rich uranium layer divided according to the marine facies shale formation
Section, uranium-bearing interval and depleted uranium interval and high resistivity interval, middle resistivity interval and low-resistivity interval, determine the sea
The advantageous interval of phase shale formation, comprising:
When the corresponding stratomere of the marine facies shale formation is rich uranium interval while being high resistivity interval, the marine facies are determined
The corresponding stratomere of shale formation is the advantageous interval of the first kind；
When the corresponding stratomere of the marine facies shale formation is rich uranium interval while being middle resistivity interval, the marine facies are determined
The corresponding stratomere of shale formation is the advantageous interval of the second class；
When the corresponding stratomere of the marine facies shale formation is rich uranium interval while being low-resistivity interval, the marine facies are determined
The corresponding stratomere of shale formation is the advantageous interval of third class.
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