CN104632201A - Method for determining lower limit value of organic carbon content of shale oil and gas dessert area - Google Patents
Method for determining lower limit value of organic carbon content of shale oil and gas dessert area Download PDFInfo
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- CN104632201A CN104632201A CN201410748419.5A CN201410748419A CN104632201A CN 104632201 A CN104632201 A CN 104632201A CN 201410748419 A CN201410748419 A CN 201410748419A CN 104632201 A CN104632201 A CN 104632201A
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- 239000003079 shale oil Substances 0.000 title claims abstract description 68
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 42
- 235000021185 dessert Nutrition 0.000 title claims description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 11
- 101100435119 Arabidopsis thaliana APRR1 gene Proteins 0.000 claims abstract description 6
- 101100435120 Arabidopsis thaliana APRR2 gene Proteins 0.000 claims abstract description 6
- 101100481792 Schizosaccharomyces pombe (strain 972 / ATCC 24843) toc1 gene Proteins 0.000 claims abstract description 6
- 239000011435 rock Substances 0.000 claims description 26
- 238000004519 manufacturing process Methods 0.000 claims description 25
- 229930195733 hydrocarbon Natural products 0.000 claims description 15
- 150000002430 hydrocarbons Chemical class 0.000 claims description 15
- 238000005516 engineering process Methods 0.000 claims description 14
- 239000004215 Carbon black (E152) Substances 0.000 claims description 13
- 238000013507 mapping Methods 0.000 claims description 11
- 238000011161 development Methods 0.000 claims description 10
- 239000005416 organic matter Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 5
- 239000004079 vitrinite Substances 0.000 claims description 3
- 208000035126 Facies Diseases 0.000 claims description 2
- 238000003556 assay Methods 0.000 claims description 2
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 238000004821 distillation Methods 0.000 claims description 2
- -1 get TOC3 Proteins 0.000 claims description 2
- 238000000691 measurement method Methods 0.000 claims description 2
- 235000009508 confectionery Nutrition 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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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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- 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
- E21B47/00—Survey of boreholes or wells
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Abstract
The invention provides a method for determining a lower limit value of organic carbon content in a 'sweet spot' of shale oil gas. The method comprises the following steps: measuring vertical well core analysis parameters and horizontal well EUR; with RoAverage、EURAverageDrawing a horizontal coordinate and a vertical coordinate, and determining to obtain Ro _ limt; plotting Ro and Sw as horizontal and vertical coordinates to obtain the upper limit value of the water saturation of Ro which is more than or equal to a%; ro with a percent less than or equal to<(a + b)% Sw and Ph data are plotted to give Ph3, Ph1, Ph2 corresponding to points where Sw _ a intersects the outer and inner envelope lines and the median line; ro with a percent less than or equal to<(a + b)% of the Ph and TOC data are plotted to obtain points corresponding to Ph3, Ph1, Ph2 and the intersection of the outer and inner envelope lines and the median line, respectively, for TOC3, TOC1, TOC2, with a minimum value of a% Ro<Lower TOC limit of (a + b)%. The method of the invention avoids errors of experience values.
Description
Technical field
The present invention relates to the evaluation method technical field of petroleum exploration and development, be specifically related to the defining method of a kind of shale oil gas " dessert district " organic carbon content lower limit.
Background technology
Along with oil-gas exploration and development is hidden to unconventionaloil pool development by conventional gas and oil, shale oil gas becomes the key areas of oil-gas exploration and development gradually.China's shale oil gas stock number is very large, and shale gas mining resources amount is about 12 tcms, and shale oil mining resources amount is more than 2,000 hundred million tons (Chinese Academy of Engineering, 2012), and shale oil gas exploration potentiality to be exploited is large.In shale oil-gas exploration and development, under current economic technology condition, the region that can obtain commercial oil and gas flow is called in " dessert district ", and organic carbon content is the key parameter controlling shale oil-production capacity and preferred " dessert district ", is also the material base of shale Oil-gas source.
There is very big difference in the shale feature formed under DIFFERENT DEPOSITIONAL ENVIRONMENTS, anabolie process, therefore, causes the shale petroleum geologic conditions of different regions to there is very big difference.Shale oil and gas production not only has relation with organic carbon content, simultaneously by the state modulator such as thermal evolution of organic matter (i.e. reflectance of vitrinite Ro), degree of porosity, hydrocarbon saturation, several key parameter comprehensively plays control action to shale oil and gas production, but its relation there is no people conducts a research.
Generally, shale oil and gas production and its organic carbon content correlation.When maturity of organic matter within the specific limits time, organic carbon content must be greater than certain value, could obtain business oil and gas production.Both at home and abroad according to the condition of production, the shale organic carbon content difference that can obtain business oil and gas production empirically inferred is very large, its scope is 0.5%-5%, the probability that shale oil gas " core space " drilling well determined according to this wide in range organic carbon content lower limit obtains business oil and gas production is about 50%, urgent need will adopt suitable method and technology accurately, determine the organic carbon content lower limit in shale oil gas " dessert district ", instruct shale oil gas exploration development deployment, improve the probability of shale oil gas evaluation precision and acquisition business oil and gas production.
At present, determine the method and technology of shale oil gas " dessert district " organic carbon content lower limit, all infer according to knowhow and similar area to obtain, but the shale oil gas features as poor geologic condition of different regions is not very large, organic carbon content lower limit also difference is very large, therefore, at the most successful north America region of shale oil-gas exploration and development, the organic carbon content lower limit of the shale oil gas " dessert district " pushed away according to knowhow and similar area is 2%-5%, and the organic carbon content lower limit of the shale oil gas " dessert district " determined in China is 0.5%-3%.According to the method for knowhow and the contrast of similar area, namely artificial experience, determines shale oil gas " dessert district " organic carbon content lower limit, inaccurate, error large, do not have theoretical foundation.Organic carbon content lower limit difference is large, is to cause the one of the main reasons that current shale oil gas " dessert district " error of quality appraisement is large, acquisition business oil and gas production well success rate is little.Still there is not the method for determination shale oil gas " dessert district " the organic carbon content lower limit of theoretical foundation.
Summary of the invention
The object of the invention is, in order to overcome the deficiency accurately cannot determining shale oil gas " dessert district " organic carbon content lower limit existed in prior art, to provide the defining method of a kind of shale oil gas " dessert district " organic carbon content lower limit.
In order to achieve the above object, the invention provides the defining method of a kind of shale oil gas " dessert district " organic carbon content lower limit, it comprises the following steps:
Steps A: to be cored maturity of organic matter Ro, the organic carbon content TOC of straight well core analysis, degree of porosity POR, water saturation Sw, hydrocarbonaceous degree of porosity Ph by the system measuring and/or calculate shale oil gas " dessert district " study area interval of interest, and all systems are cored the final produced quantity EUR of oil gas of all horizontal wells in straight well certain distance;
Step B: calculate every port system and to core the average Ro of maturity of organic matter Ro of straight well
on average, and every port system is cored the average EUR of the final produced quantity EUR of oil gas of all horizontal wells in straight well certain distance
on average, with Ro
on averagefor abscissa, EUR
on averagefor ordinate mapping, as shown in Figure 2, with the lowest economic technology oil gas final produced quantity EUR value of the horizontal well of this study area interval of interest for boundary, determine the minimum Ro value Ro_limt obtaining business oil and gas production;
Step C: employing system is cored the maturity of organic matter Ro of straight well core analysis and water saturation Sw data, take Ro as abscissa, Sw maps for ordinate, as shown in Figure 3, make the enveloping outer enclosure of all reasonable data in the drawings, some Ro are greater than the value Sw_a of Sw corresponding to vertical with transverse axis and crossing with the enveloping outer enclosure point of a value of Ro_limt, namely be under Ro >=a% condition, the water saturation higher limit of obtainable business oil and gas production;
Step D: selecting system is cored the water saturation Sw of a%≤Ro< (a+b) % in straight well core analysis data and hydrocarbonaceous degree of porosity Ph data, take Ph as abscissa, Sw maps for ordinate, as shown in Figure 4, make outer, interior envelope and the intermediate value line of all reasonable data in the drawings, get Sw be the value of Sw_a perpendicular to crossing with outer, interior envelope and the intermediate value line respectively point of the longitudinal axis, corresponding Ph value is respectively Ph3, Ph1, Ph2;
Step e: selecting system is cored the hydrocarbonaceous degree of porosity Ph of a%≤Ro< (a+b) % in straight well core analysis data and organic carbon content TOC data, take TOC as abscissa, Ph is ordinate mapping, as shown in Figure 5, make outside all reasonable data in the drawings, interior envelope and intermediate value line, get Ph and be respectively Ph3, Ph1, the value of Ph2, perpendicular to the longitudinal axis and respectively with outward, the point that interior envelope and intermediate value line intersect, corresponding TOC value is respectively TOC3, TOC1, TOC2, get TOC3, TOC1, minimum value in TOC2 three is as the lower limit of TOC within the scope of a%≤Ro< (a+b) %.
According to the specific embodiment of the present invention, preferably, the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit also comprises step F: repeat step B-E, determine the organic carbon content TOC lower limit of shale oil gas within the scope of different Ro " dessert district ".
In the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit, preferably, in described steps A, the straight well core analysis of coring of the system of study area interval of interest is the straight well adopting study area interval of interest whole, and carries out boring sample at a certain distance to every mouthful of straight well and analyze.
In the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit, preferably, in described steps A, the horizontal well of coring in certain distance corresponding to straight well with system is for change little or substantially constant at this apart from interior geologic parameter, oil and gas production difference is mainly derived from the horizontal well of engineering factor, this distance is 2km-3.5km for marine bed, is 1.5km-2.5km for Continental Facies Stratigraphy.
In the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit, preferably, in described steps A, rock core maturity of organic matter Ro measures according to reflectance of vitrinite assay method in sedimentary rock (SY/T 5124-2012) and obtains; Rock core organic carbon content TOC measures according to the mensuration (GB/T 19145-2003) of total organic carbon in sedimentary rock to obtain; Core porosity POR measures according to GRI (Gas research institute) shale porosity measurement method and obtains; Rock core water containing saturability Sw measures according to rock oil and water saturation distillation apparatus calibration steps (SY/T 6811-2010) and obtains; Rock core hydrocarbonaceous degree of porosity Ph is calculated by the product of rock core hydrocarbon saturation and core porosity POR, and wherein rock core hydrocarbon saturation is calculated by the difference of rock mesopore volume and moisture volume; The oil gas final produced quantity EUR of horizontal well obtains according to the production of hydrocarbons data of study area development time longer producing well.In the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit, preferably, in described step B, with Ro
on averagefor abscissa, EUR
on averagefor ordinate mapping employing is linear coordinate system.
In the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit, preferably, in described step B, the lowest economic technology oil gas final produced quantity EUR value of described horizontal well is by economic technology condition instantly, cost of production, tax revenue, rate of return on investment factor is considered, the minimum business oil gas cumulative production calculated within the scope of this study area interval of interest.Those skilled in the art can determine according to the lowest economic technology oil gas final produced quantity EUR value of actual conditions to the horizontal well of study area interval of interest.Determine by lowest economic technology oil gas final produced quantity EUR value the Ro lower limit obtaining business oil and gas production, hydrocarbon source rock Ro does not have extraction value lower than this lower limit.
In the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit, preferably, in described step C, take Ro as abscissa, Sw for ordinate mapping adopt be linear coordinate system.
In the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit, preferably, in described step C, the scope of the b in a%≤Ro< (a+b) % is (a+0.1)≤b≤(a+0.3).Hydrocarbon source rock maturity of organic matter research range a%≤Ro< (a+b) % of study area interval of interest should not be too wide, and general range is that 0.1%-0.3% is advisable, and can suitably relax.
In the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit, preferably, in described step D, take Ph as abscissa, Sw for ordinate mapping adopt be linear coordinate system.Outward, interior envelope is make with a certain transverse axis value the line being parallel to the longitudinal axis in Data distribution8 envelope, and hand over two points with outer, interior envelope, the envelope at the intersection point place, direction that longitudinal axis value is large is enveloping outer enclosure, and all the other one is interior envelope; The line that intermediate value line is perpendicular to enveloping outer enclosure is crossing with outer, interior envelope, the intermediate value line of two intersection points; Ph3 is the abscissa Ph value with enveloping outer enclosure intersection point, and Ph1 is the abscissa Ph value with interior envelope intersection point, and Ph2 is the abscissa Ph value with intermediate value line intersection point.
In the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit, preferably, in described step D, described reasonable data is meet the regularity of distribution and the data relatively concentrated that distribute.
In the defining method of above-mentioned shale oil gas " dessert district " organic carbon content lower limit, preferably, in described step e, take TOC as abscissa, Ph for ordinate mapping adopt be linear coordinate system.TOC3 was that longitudinal axis Ph3 is parallel to the transversal line transverse axis T OC value corresponding with the intersection point of enveloping outer enclosure, TOC1 was that longitudinal axis Ph1 is parallel to the transversal line transverse axis T OC value corresponding with the intersection point of interior envelope, and TOC2 was that longitudinal axis Ph2 is parallel to the transversal line transverse axis T OC value corresponding with the intersection point of intermediate value line.
In the present invention, the principle of the defining method institute foundation of organic carbon content lower limit is: could form shale oil gas after hydrocarbon source rock reaches certain strength maturity factor, so shale oil gas " dessert district " must on certain Ro (Fig. 2); After the oil gas that shale series of strata generate is full of himself space, just start to discharge, shale series of strata increase along with Ro, Sw reduction, so, the Sw upper limit difference (Fig. 3) that different Ro is corresponding; The oil-containing tolerance that the exploitation of shale oil gas economic technology depends primarily on wherein, i.e. hydrocarbonaceous degree of porosity, hole comprises organic hole and inorganic hole, organic hole increases along with Ro and increases, inorganic hole increases along with Ro and reduces, and the two superposition has certain limit to the contribution of hydrocarbonaceous hole, so, utilize the hydrocarbonaceous degree of porosity that the Sw upper limit in Ro certain limit is corresponding, consider different aperture type and evolution condition (Fig. 4); The TOC lower limit corresponding according to different hydrocarbonaceous degree of porosity, the minimum value of getting the TOC lower limit determined within the scope of certain Ro is its lower limit (Fig. 5).
The defining method of shale oil gas provided by the invention " dessert district " organic carbon content lower limit, the method that the static geologic parameter that employing system cores straight well core analysis combines with the dynamic creation data of corresponding horizontal well, the influence factor of consideration is more comprehensively; Determine by economic technology EUR output the Ro lower limit obtaining business oil and gas production, set up with economic benefit and contact, " dessert district " TOC selected more tallies with the actual situation; When determining TOC lower limit, considering the factors such as Sw, the POR within the scope of certain Ro, more can embody actual production governing factor; Give within the scope of certain Ro, obtain the TOC lower limit in " the dessert district " of business oil and gas production, for the selection in shale oil gas evaluation of priorities exploration and development district provides foundation.With at present according to compared with the method for artificial experience determination shale oil gas " dessert district " TOC lower limit, there is theoretical foundation in method of the present invention, the TOC lower limit that different Ro area is determined is different, more accurate, avoid in prior art according to artificial experience value, do not consider the impact of Ro on TOC lower limit, and the error brought.
Accompanying drawing explanation
Fig. 1 is the flow chart of shale oil gas " dessert district " the organic carbon content lower limit defining method of a specific embodiment of the present invention.
Fig. 2 is shale oil gas of the present invention " dessert district " hydrocarbon source conditions lower limit determination schematic diagram.
Fig. 3 is the water saturation higher limit determination schematic diagram of shale oil gas of the present invention " dessert district " hydrocarbon source rock differing maturity.
Fig. 4 is shale oil gas of the present invention " dessert district " hydrocarbonaceous degree of porosity boundary value determination schematic diagram.
Fig. 5 is shale oil gas of the present invention " dessert district " organic carbon content lower limit determination schematic diagram.
Fig. 6 is in a specific embodiment of the present invention, and shale oil gas " dessert district " hydrocarbon source conditions lower limit determines figure.
Fig. 7 is in a specific embodiment of the present invention, and the water saturation higher limit of shale oil gas " dessert district " hydrocarbon source rock differing maturity determines figure.
Fig. 8 is in a specific embodiment of the present invention, and shale oil gas " dessert district " hydrocarbonaceous degree of porosity boundary value determines figure.
Fig. 9 is in a specific embodiment of the present invention, and shale oil gas " dessert district " organic carbon content lower limit determines figure.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
It is below the present invention one specific embodiment.
Present embodiments provide the defining method of a kind of shale oil gas " dessert district " organic carbon content lower limit, as shown in Figure 1, it comprises the following steps:
Steps A: to be cored maturity of organic matter Ro, the organic carbon content TOC of straight well core analysis, degree of porosity POR, water saturation Sw, hydrocarbonaceous degree of porosity Ph by the system measuring and/or calculate shale oil gas " dessert district " study area interval of interest, and all systems are cored the final produced quantity EUR of oil gas of all horizontal wells in straight well certain distance; Wherein, rock core maturity of organic matter Ro measures according to reflectance of vitrinite assay method (SY/T5124-2012) in sedimentary rock and obtains; Rock core organic carbon content TOC measures according to the mensuration (GB/T 19145-2003) of total organic carbon in sedimentary rock to obtain; Core porosity POR measures according to GRI (Gas research institute) shale porosity measurement method and obtains; Rock core water containing saturability Sw measures according to rock oil and water saturation distillation apparatus calibration steps (SY/T 6811-2010) and obtains; Rock core hydrocarbonaceous degree of porosity Ph is calculated by the product of rock core hydrocarbon saturation and core porosity POR, and wherein rock core hydrocarbon saturation is calculated by the difference of rock mesopore volume and moisture volume; The oil gas final produced quantity EUR of horizontal well obtains according to the production of hydrocarbons data of study area development time longer producing well;
Step B: calculate every port system and to core the average Ro of maturity of organic matter Ro of straight well
on average, and every port system is cored the average EUR of the final produced quantity EUR of oil gas of all horizontal wells in straight well certain distance
on average, with Ro
on averagefor abscissa, EUR
on averagefor ordinate mapping, with the lowest economic technology oil gas final produced quantity EUR value of the horizontal well of this study area interval of interest for boundary, determine the minimum Ro value Ro_limt obtaining business oil and gas production;
Step C: employing system is cored the maturity of organic matter Ro of straight well core analysis and water saturation Sw data, take Ro as abscissa, Sw maps for ordinate, make the enveloping outer enclosure of all reasonable data in the drawings, some Ro are greater than the value Sw_a of Sw corresponding to vertical with transverse axis and crossing with the enveloping outer enclosure point of a value of Ro_limt, namely be under Ro >=a% condition, the water saturation higher limit of obtainable business oil and gas production;
Step D: selecting system is cored the water saturation Sw of a%≤Ro< (a+b) % in straight well core analysis data and hydrocarbonaceous degree of porosity Ph data, wherein hydrocarbonaceous degree of porosity Ph (referring to the percentage of total pore size volume shared by the hydro carbons volume) product that is hydrocarbon saturation and degree of porosity POR, take Ph as abscissa, Sw is ordinate mapping, make outside all reasonable data in the drawings, interior envelope and intermediate value line, get Sw be the value of Sw_a perpendicular to the longitudinal axis respectively with outward, the point that interior envelope and intermediate value line intersect, corresponding Ph value is respectively Ph3, Ph1, Ph2,
Step e: selecting system is cored the hydrocarbonaceous degree of porosity Ph of a%≤Ro< (a+b) % in straight well core analysis data and organic carbon content TOC data, take TOC as abscissa, Ph is ordinate mapping, make outside all reasonable data in the drawings, interior envelope and intermediate value line, get Ph and be respectively Ph3, Ph1, the value of Ph2, perpendicular to the longitudinal axis and respectively with outward, the point that interior envelope and intermediate value line intersect, corresponding TOC value is respectively TOC3, TOC1, TOC2, get TOC3, TOC1, minimum value in TOC2 three is as the lower limit of TOC within the scope of a%≤Ro< (a+b) %,
Step F: repeat step B-E, determine the organic carbon content TOC lower limit of shale oil gas within the scope of different Ro " dessert district ".
Utilize the method for the present embodiment, the shale oil hydrocarbon source rock organic carbon lower limit of 0.9%≤Ro<1.1% in the shale oil gas of hawk beach is determined.
To core rock core maturity of organic matter Ro, the organic carbon content TOC of straight well 43 mouthfuls, degree of porosity POR, water saturation Sw, hydrocarbonaceous degree of porosity Ph by measuring and/or calculate hawk beach system, to core the EUR of the totally 516 mouthfuls of water horizontal wells within the scope of 3km corresponding to straight well with each port system, the lowest economic technology oil gas final produced quantity EUR value of the horizontal well of this study area interval of interest is 30,000 tons, utilizes each port system to core the Ro of straight well
on averagewith the EUR that all levels within the scope of the 3km of its correspondence are equal
on averagerelation, determines that hawk beach can obtain the Ro of business oil and gas production
on averagelower limit is 0.85% (Fig. 6), can not obtain economic technology output when hydrocarbon source rock Ro is less than 0.85%; The system choosing 0.9%≤Ro<1.1% is cored Ro and the Sw data opening relationships that straight well shale core is analyzed, and according to the enveloping outer enclosure that all reasonable data points are made, Sw value corresponding during Ro=0.9% is 32% (Fig. 7); Choose 0.9%≤Ro<1.0% system core straight well shale core analyze the opening relationships of Sw and Ph data, make outer, interior envelope and the intermediate value line of all reasonable data, get Sw=32% perpendicular to Sw axle respectively with the intersection point of outer, interior envelope and intermediate value line, corresponding Ph value is respectively 7.7%, 2.15%, 4.9% (Fig. 8); Choose 0.9%≤Ro<1.1% system core straight well shale core analyze the opening relationships of Ph and TOC data, make outer, interior envelope and the intermediate value line of all reasonable data, get the point that Ph is respectively 7.7%, 2.15%, 4.9%, respectively perpendicular to the intersection point of Ph axle and outer, interior envelope and intermediate value line, corresponding TOC value is respectively 2.4%, 2.5%, 2.7%, when the minimum value of getting three is as 0.9%≤Ro<1.1%, the lower limit of shale oil gas " dessert district " TOC, namely TOC gets 2.4% (Fig. 9).
The defining method of shale oil gas " dessert district " the organic carbon content lower limit of the present embodiment, the core static geologic parameter of straight well core analysis of employing system combines with the dynamic creation data of corresponding horizontal well, determine that the hydrocarbon source rock Ro lower limit obtaining business oil and gas production is 0.85% by economic technology EUR output, more tally with the actual situation, and according to the method that artificial experience is determined in prior art, different people experience is different, and the Ro lower limit difference determined is very large; Shale increases along with strength maturity factor, and water saturation reduces, and adopts the Sw upper limit of different Ro shale different, more coincidently descend actual conditions, as Ro=0.85% time, Sw=34%, Ro=0.9% time, Sw=32%, do not consider in prior art that Sw changes with Ro change; Determine that one of key factor of shale oil gas commercial quantities ability is its hydrocarbonaceous degree of porosity, therefore on the basis of Ro, Sw change, superpose the change of POR, by the relation of Ph, Sw and TOC, determining shale oil corresponding to 0.9%≤Ro<1.1% " dessert district " TOC lower limit is 2.4%, dropping on the North America shale oil gas determined by artificial experience succeeds in developing within district TOC lower limit 2%-5% scope, its value is more accurate, foundation is more abundant, meanwhile, much larger than the TOC lower limit 0.5% that Chinese expert determines.
Claims (9)
1. a defining method for shale oil gas " dessert district " organic carbon content lower limit, it comprises the following steps:
Steps A: to be cored maturity of organic matter Ro, the organic carbon content TOC of straight well core analysis, degree of porosity POR, water saturation Sw, hydrocarbonaceous degree of porosity Ph by the system measuring and/or calculate shale oil gas " dessert district " study area interval of interest, and all systems are cored the final produced quantity EUR of oil gas of all horizontal wells in straight well certain distance;
Step B: calculate every port system and to core the average Ro of maturity of organic matter Ro of straight well
on average, and every port system is cored the average EUR of the final produced quantity EUR of oil gas of all horizontal wells in straight well certain distance
on average, with Ro
on averagefor abscissa, EUR
on averagefor ordinate mapping, with the lowest economic technology oil gas final produced quantity EUR value of the horizontal well of this study area interval of interest for boundary, determine the minimum Ro value Ro_limt obtaining business oil and gas production;
Step C: employing system is cored the maturity of organic matter Ro of straight well core analysis and water saturation Sw data, take Ro as abscissa, Sw maps for ordinate, make the enveloping outer enclosure of all reasonable data in the drawings, some Ro are greater than the value Sw_a of Sw corresponding to vertical with transverse axis and crossing with the enveloping outer enclosure point of a value of Ro_limt, namely be under Ro >=a% condition, the water saturation higher limit of obtainable business oil and gas production;
Step D: selecting system is cored the water saturation Sw of a%≤Ro< (a+b) % in straight well core analysis data and hydrocarbonaceous degree of porosity Ph data, take Ph as abscissa, Sw maps for ordinate, make outer, interior envelope and the intermediate value line of all reasonable data in the drawings, get Sw be the value of Sw_a perpendicular to crossing with outer, interior envelope and the intermediate value line respectively point of the longitudinal axis, corresponding Ph value is respectively Ph3, Ph1, Ph2;
Step e: selecting system is cored the hydrocarbonaceous degree of porosity Ph of a%≤Ro< (a+b) % in straight well core analysis data and organic carbon content TOC data, take TOC as abscissa, Ph is ordinate mapping, make outside all reasonable data in the drawings, interior envelope and intermediate value line, get Ph and be respectively Ph3, Ph1, the value of Ph2, perpendicular to the longitudinal axis and respectively with outward, the point that interior envelope and intermediate value line intersect, corresponding TOC value is respectively TOC3, TOC1, TOC2, get TOC3, TOC1, minimum value in TOC2 three is as the lower limit of TOC within the scope of a%≤Ro< (a+b) %.
2. the defining method of shale oil gas according to claim 1 " dessert district " organic carbon content lower limit, it is further comprising the steps of:
Step F: repeat step B-E, determine the organic carbon content TOC lower limit of shale oil gas within the scope of different Ro " dessert district ".
3. the defining method of shale oil gas according to claim 1 " dessert district " organic carbon content lower limit, it is characterized in that, in described steps A, the straight well core analysis of coring of the system of study area interval of interest is the straight well adopting study area interval of interest whole, and carries out boring sample at a certain distance to every mouthful of straight well and analyze.
4. the defining method of shale oil gas according to claim 1 " dessert district " organic carbon content lower limit, it is characterized in that, in described steps A, the horizontal well of coring in certain distance corresponding to straight well with system is for change little or substantially constant at this apart from interior geologic parameter, oil and gas production difference is mainly derived from the horizontal well of engineering factor, this distance is 2km-3.5km for marine bed, is 1.5-2.5km for Continental Facies Stratigraphy.
5. the defining method of shale oil gas according to claim 1 " dessert district " organic carbon content lower limit, it is characterized in that, in described steps A, rock core maturity of organic matter Ro measures according to reflectance of vitrinite assay method in SY/T 5124-2012 sedimentary rock and obtains; Rock core organic carbon content TOC measures according to the mensuration of total organic carbon in GB/T19145-2003 sedimentary rock to obtain; Core porosity POR measures according to GRI shale porosity measurement method and obtains; Rock core water containing saturability Sw measures according to SY/T 6811-2010 rock oil and water saturation distillation apparatus calibration steps and obtains; Rock core hydrocarbonaceous degree of porosity Ph is calculated by the product of rock core hydrocarbon saturation and core porosity POR, and wherein rock core hydrocarbon saturation is calculated by the difference of rock mesopore volume and moisture volume; The oil gas final produced quantity EUR of horizontal well obtains according to the production of hydrocarbons data of study area development time longer producing well.
6. the defining method of shale oil gas according to claim 1 " dessert district " organic carbon content lower limit, it is characterized in that, in described step B, the lowest economic technology oil gas final produced quantity EUR value of described horizontal well is by economic technology condition instantly, cost of production, tax revenue, rate of return on investment factor is considered, the minimum business oil gas cumulative production calculated within the scope of this study area interval of interest.
7. the defining method of shale oil gas according to claim 1 " dessert district " organic carbon content lower limit, it is characterized in that, in described step C, the scope of the b in a%≤Ro< (a+b) % is (a+0.1)≤b≤(a+0.3).
8. shale oil gas according to claim 1 " dessert district " organic carbon content lower limit defining method, is characterized in that, in described step D, described reasonable data is meet the regularity of distribution and the data concentrated that distribute.
9. the defining method of shale oil gas according to claim 1 " dessert district " organic carbon content lower limit, is characterized in that, in described step B, with Ro
on averagefor abscissa, EUR
on averagefor ordinate mapping employing is linear coordinate system; In described step C, take Ro as abscissa, Sw for ordinate mapping adopt be linear coordinate system; In described step D, take Ph as abscissa, Sw for ordinate mapping adopt be linear coordinate system; In described step e, take TOC as abscissa, Ph for ordinate mapping adopt be linear coordinate system.
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