CN103630669B - Experimental method for evaluating oil content of unconventional compact and shale reservoir - Google Patents
Experimental method for evaluating oil content of unconventional compact and shale reservoir Download PDFInfo
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Abstract
The invention discloses an unconventional oil-bearing property evaluation experiment method for a compact and shale reservoir, which can effectively evaluate the oil-bearing properties of silty mudstone and siltstone by utilizing a closed coring saturation and fluorescence slice technology, can effectively evaluate the oil-bearing properties of the mudstone and the siltstone by rock pyrolysis, laser confocal, scanning electron microscope and energy spectrum, and can effectively evaluate the micro oil-bearing properties of the compact and shale reservoir by matching with comprehensive application, mutual verification and mutual supplement of the technical indexes. The method is verified by taking the unconventional oil and gas exploration well Qp1 in the Daqing exploration area as an example, and new knowledge is obtained. The invention provides experimental technical support for unconventional oil and gas exploration and development and seven-property evaluation such as oil content evaluation of a compact and shale reservoir.
Description
Technical field
The present invention relates to a kind of unconventionaloil pool Reservoir oil-bearing property evaluation method, be specifically related to unconventional densification and shale reservoir oil bearing evaluation experimental technique, belong to unconventionaloil pool exploratory development field.
Background technology
In recent years, the unconventional petroleum resourceses such as fine and close oil gas, shale gas, heavy oil and oil-sand realize scale development, promote globe petroleum industry and enter the conventional new stage of laying equal stress on unconventional petroleum resources, the fine and close oil gas of China makes substantial progress, league (unit of length) tight gas district of Ordos Basin Soviet Union, the northern high estrade of Song-liao basin and the fine and close oily district of FY oil-layer etc. are found, fine and close oil gas has become the unconventional petroleum resources of reality the most at present, is expected to become important making & breaking.
Fine and close oil gas refers to the oil-gas accumulation formed in the compact reservoir being clipped in or being close to hydrocarbon source rock series of strata, without extensive long-distance migration; Mud shale oil refers to composes that to be stored in rich organic, nano aperture be oil in main mud shale stratum, is the abbreviation of ripe organic mud shale oil; Fine and close and mud shale is oily general without natural production capacity, need could form industrial production capacity through massive hydraulic fracture technology.Fine and close and the oily resource abundance generally of mud shale is low, reservoir poor quality, nonuniformity are strong.Unconventional densification and shale reservoir oil bearing evaluation are that " seven property " one of is evaluated, and to realizing reservoir quality evaluation and research source storage configuration relation, determine that the exploratory development such as densification and mud shale oil " dessert " is significant.
There are the oil bearing evaluation methods such as the unconventional densification of bibliographical information and shale oil gas, youth, Wen Yihua, Zheng Lei etc. " the Sandstone Gas Reservoir prediction of prestack inversion and hydrocarbon potential detection " is appointed (to tell Kazakhstan oil gas see (1), 1st phase in 2012), (2) Zhang Jinyan " oil shale fuel Logging Evaluation Method and application thereof " (Advances in Geophysics, 3rd phase in 2012), (3) Li little Mei " oil-bearing probability of lithological hydrocarbon reservoir in Dongying Sag quantitative evaluation prediction " (oil-gas geology and recovery ratio, the 3rd phase in 2006) etc.Above-mentioned (1) adopts seismic data relative amplitude preserved processing and prestack inversion integrated technique, and prediction densification and shale reservoir oil-gas possibility, often at oil bearing evaluation macroscopically; Above-mentioned (2) utilize logging method, carry out oil shale fuel oil bearing evaluation, and because the reservoir space of compact reservoir is little, the hydrocarbon information that logging technology can detect is more weak, and oil bearing evaluation difficulty is large; Above-mentioned (3) adopt successive Regression, reject the Quantitative Prediction Model that the Application of Mathematical Geology Methods of variable establishes lithologic trap oiliness.These methods are all difficult to carry out test and repair to unconventional densification and shale reservoir nanoscale-micron order-grade-centimetre-sized microcosmic oiliness.
Summary of the invention
The object of the invention is to solve unconventionaloil pool Reservoir oil-bearing property evaluation problem, and a kind of unconventional densification and shale reservoir oil bearing evaluation experimental technique are provided.
Unconventional densification provided by the invention and shale reservoir oil bearing evaluation experimental technique, comprise following steps:
1) rock core drilled through is carried out on-the-spot supporting sampling by unconventional densification and shale reservoir sampling principle, obtain fine and close and shale reservoir core experiment sample;
2) unconventional densification step 1) obtained and shale reservoir core experiment sample, the project assorted detection of experiment Analysis, obtains fine and close and shale reservoir core experiment analysis result;
3) by step 2) the unconventional densification that obtains and shale reservoir core experiment analysis result, the evaluation of the single experiment such as rock pyrolysis, fluorescence thin section is carried out according to different lithology, utilize software to draw, obtain fine and close and shale reservoir oiliness single item evaluation figure and experimental evaluation result;
4) unconventional densification step 3) obtained and shale reservoir oiliness single item evaluation figure and experimental evaluation result, carry out oiliness comprehensive evaluation, utilize software to draw, and obtains fine and close and shale reservoir oiliness map of Complex evaluation and experimental evaluation result.
Described unconventional densification and shale reservoir oil bearing evaluation experimental technique, wherein:
Get when the unconventional densification of step 1) and mud shale boring sample principle are lithological change a set of, the continuous 1m of mud stone section at least gets two covers, Sandstone Section 0.2m at least gets a set of laboratory sample; Often overlap laboratory sample and include sample for sealing core drill saturation degree or nuclear magnetic resonance, rock pyrolysis, fluorescence thin section, laser co-focusing, scanning electron microscope and energy spectrum analysis.
Step 2) the project assorted detection of experimental analysis comprises sealing core drill saturation degree or nuclear magnetic resonance spectroscopy, rock pyrolysis analysis, fluorescence thin section analysis, laser co-focusing analysis, scanning electron microscope and energy spectrum analysis etc.
Different lithology described in step 3) is mud stone, containing siltpelite, silty, siltstone etc.
Step 4) densification and shale reservoir oiliness experiment comprehensive evaluation refer to and utilize the sealing core drill saturation degree of step 3) or the single experiment such as nuclear magnetic resonance, rock pyrolysis evaluation result mutually to verify, complement one another.
In described unconventional densification and shale reservoir oil bearing evaluation experimental technique, step 3) and step 4) are drawn unconventional densification and shale reservoir oil bearing evaluation figure and are adopted card to run quickly mapping software.
In described unconventional densification and shale reservoir oil bearing evaluation experimental technique, step 1), 2), 3) and 4) unconventional densification and shale reservoir refer to the reservoir that factor of porosity is less than 12%, ground level air infiltration rate is less than 1mD.
The present invention utilizes core experiment analysis method to unconventional densification and shale reservoir oil bearing evaluation, solve unconventional densification and shale reservoir resource abundance is low, poor quality, nonuniformity are strong, grow the problem of centimetre-sized and grade sandstone band and nanoscale hole oil bearing evaluation difficulty, unconventional densification and shale reservoir oil-containing situation can be reflected, support for unconventional densification and shale reservoir oil bearing evaluation and exploratory development provide experimental technique.
Accompanying drawing explanation
Fig. 1 is Qp1 well 1982.550-1982.567m thin section identification figure;
Fig. 2 is Qp1 well 1982.554-1982.567m fluorescence thin section image;
Fig. 3 is Qp1 well 1995.85-1998.24m fluorescence thin section image;
Fig. 4 is Qp1 well 1989.84-1991.68m fluorescence thin section image;
Fig. 5 is Qp1 well 1983.59-1986.39m fluorescence thin section image;
Fig. 6 is Qp1 well different lithology fluorescence thin section oil bearing evaluation figure
Fig. 7 is the three-dimensional imaging of Qp1 well 1987.62m mud stone organic components laser co-focusing;
Fig. 8 is the three-dimensional imaging of Qp1 well 1996.34m mud stone organic components laser co-focusing;
Fig. 9 is the three-dimensional imaging of Qp1 well 1989.84m siltstone organic components laser co-focusing;
Figure 10 is the burnt two dimensional image of Qp1 well 1982.554-1982.567m mud stone burning into sand bar image laser copolymerization;
Figure 11 is Qp1 well different lithology rock pyrolysis oil bearing evaluation figure;
Figure 12 is Qp1 well oil saturation oil bearing evaluation figure;
Figure 13 is Qp1 well 1994.64m silty oiliness environmental scanning electronic microscope and energy spectrogram;
Figure 14 is Qp1 well oiliness map of Complex evaluation.
Embodiment
The present invention mainly proposes unconventional densification and shale reservoir oil bearing evaluation experimental technique, it mainly utilizes unconventional densification and shale reservoir core experiment analysis method to unconventional densification and mud shale rock core nanoscale to centimetre-sized oiliness microcosmic detection, reach the object to unconventional reservoir oil bearing evaluation, meet the demand of unconventionaloil pool exploratory development to geology experimental technique.The core experiment analysis method that the present invention is directed to unconventional densification and shale reservoir comprises rock pyrolysis analysis and obtains the indexs such as S1, S2, sealing core drill saturation degree and nuclear magnetic resonance spectroscopy obtain the indexs such as the moisture and oil saturation of rock, fluorescence thin section analytical approach obtains the indexs such as oily fluoroscopic image, oil content, laser co-focusing obtains the index such as two dimensional image, 3-D view, environmental scanning electronic microscope and energy spectrum analysis obtain nanoaperture oil image and type, recycle these indexs and carry out individual event and comprehensive evaluation to unconventional densification and shale reservoir oiliness.
The present invention is described in detail below from several respects.
One, unconventional densification and shale reservoir oil bearing evaluation experimental technique
The unconventional densification of present embodiment and shale reservoir oil bearing evaluation experimental technique complete in the steps below:
1) rock core drilled through is carried out on-the-spot supporting sampling by unconventional densification and shale reservoir sampling principle, obtain fine and close and shale reservoir core experiment sample;
2) unconventional densification step 1) obtained and shale reservoir core experiment sample, the project assorted detection of experiment Analysis, obtains fine and close and shale reservoir core experiment analysis result;
3) by step 2) the unconventional densification that obtains and shale reservoir core experiment analysis result, the evaluation of the single experiment such as rock pyrolysis, fluorescence thin section is carried out according to different lithology, utilize software to draw, obtain fine and close and shale reservoir oiliness single item evaluation figure and experimental evaluation result.
4) unconventional densification step 3) obtained and shale reservoir oiliness single item evaluation figure and experimental evaluation result, carry out oiliness comprehensive evaluation, utilize software to draw, and obtains fine and close and shale reservoir oiliness map of Complex evaluation and experimental evaluation result.
Here, described unconventional densification and shale reservoir refer to the reservoir that factor of porosity is less than 12%, ground level air infiltration rate is less than 1mD.
The acquisition of step 1) laboratory sample completes by unconventional sampling mode.Get when unconventional densification and mud shale core experiment sample principle are lithological change a set of, the continuous 1m of mud stone section at least gets two covers, Sandstone Section 0.2m at least gets a set of laboratory sample; Often overlap laboratory sample and include sample for sealing core drill saturation degree and nuclear magnetic resonance, rock pyrolysis, fluorescence thin section, laser co-focusing, scanning electron microscope and energy spectrum analysis.
Step 2) experimental analysis comprise rock pyrolysis analysis and obtain the index such as S1, S2, sealing core drill saturation degree or nuclear magnetic resonance spectroscopy obtain the indexs such as the moisture and oil saturation of rock, fluorescence thin section analytical approach obtains the indexs such as oily fluoroscopic image, oil content, laser co-focusing obtains the index such as two dimensional image, 3-D view, and environmental scanning electronic microscope and energy spectrum analysis obtain nanoaperture oil image and type.
Different lithology described in step 3) is mud stone, containing siltpelite, silty, siltstone etc.Single item evaluation carries out respectively based on different experimental analysis indexs.
Step 4) densification and shale reservoir oiliness experiment comprehensive evaluation refer to and utilize the sealing core drill saturation degree of step 3) and the single experiment such as nuclear magnetic resonance, rock pyrolysis evaluation result mutually to verify, complement one another.
Step 3) and step 4) draw unconventional densification and shale reservoir oil bearing evaluation figure adopts card to mapping software.
Two, the specific embodiment of the inventive method
The implementation process of the inventive method is described for Daqing exploration area unconventionaloil pool prospect pit Qp1 well below.
Research background:
In order to realize the breakthrough of the unconventional densification in Daqing exploration area and the exploitation of mud shale exploration activity, deploy emphasis prospect pit Qp1 well in Song-liao basin the north, exploration zone of interest is that high beach dumping site is fine and close and mud shale is oily.By drilling and adopting extensive volume fracturing, obtain the commercial oil of daily output 10.2t, achieve the important breakthrough of unconventional fine and close oil gas, illustrate the good prospect of the northern unconventional fine and close oil gas of Song-liao basin.According to " summary is put forward industry and tested, and forms supporting technology, expands and applies scale; Strengthen fine and close and shale reservoir ' seven property ' evaluate and crack, stress prediction, find more rich accumulation of oil and gas desserts " requirement; in the unconventional densification of Qp1 well and the meticulous accurate description of mud shale rock core lithology and assessment of rock properties basis; the present invention completes " seven property " evaluate one of oiliness experimental evaluation, for exploratory development research provide the foundation.
One) acquisition of laboratory sample and analysis: drilling well after the removal of core of underground to rock core petrographic description, comprise siltstone, silty, (ensure that various lithology sample is all got containing siltpelite and mud stone etc., to carry out oil bearing evaluation by lithology breakdown), get the supporting core sample of Qp1 well 1980-2000m experimental analysis 291 according to the method for step 1) in petrographic description result and unconventional densification and mud shale core experiment sample principle employing one, number with well depth; Utilize step 2 in) method core sample experiments supporting is analyzed, obtain fine and close and shale reservoir rock core (unconventional sample, finger-hole porosity is less than 12%, ground level air infiltration rate is less than 1mD) experiment analysis results.
Two) analysis result and single item evaluation:
1, rock fluorescence thin section determines densification and shale reservoir oiliness
Fluorescence thin section analytical approach (oil and gas industry key rock fluorescence thin section qualification SY/T5614-2011) is utilized to obtain the oily fluoroscopic image of Qp1 well core sample 60.Analysis conclusion is:
(1) the micro-source-reservoir-seal assemblage type of mud stone-emery stick-mud stone and microtrap
Qp1 well 1980-2000m contains the micro-source-reservoir-seal assemblage type of mud stone-emery stick-mud stone and microtrap, presss from both sides centimetre-sized or the most oil-containing of grade flour sand bar reservoir in argillite.As pressed from both sides the siltstone band reservoir of 0.002m in 1981.00-1983.40m argillite layer (see Fig. 1,1982.554-1982.556m, thin section identification), fluorescence thin section image shows it containing grade-micron order hole oil (see Fig. 2, left side is fluoroscopic image, right side is polarized light image), oil content is 8%.
(2) mud stone, containing siltpelite substantially containing grade-micron order hole oil
The mud stone fluorescence of large section of Qp1 well is weak, substantially not oily containing grade-micron order hole, containing siltpelite also without grade-micron order hole oil, as 1995.85-1998.24m(is shown in Fig. 3, left side be fluoroscopic image, and right side is polarized light image) show mud stone, containing siltpelite without the oily feature of grade-micron order hole.
Under the background of the general oil-containing of thick-layer Sandstone Section siltstone, containing siltpelite substantially not containing grade-micron order hole oil, embody lithology to the control of oiliness.As 1989.84-1991.68m thick-layer sandstone fluorescence thin section image (Fig. 4, left side is fluoroscopic image, right side is polarized light image) show containing siltpelite without grade-micron order hole oil feature, as weak containing siltpelite fluorescence in 1990.32m, maybe may be oily containing nanoscale hole without grade-micron order hole oil, and 1989.84m siltstone oil content 53%, 1991.68m siltstone oil content 29%.
(3) siltstone, silty are generally containing grade-micron order hole oil
Qp1 well siltstone, silty are generally containing grade-micron order hole oil, as 1983.59-1986.39m fluorescence thin section image (Fig. 5, left side is fluoroscopic image, right side is polarized light image) show siltstone containing grade-micron order hole oil, 1983.59m siltstone oil content 32%, 1986.39m siltstone oil content 31%.
Fine and close and shale reservoir fluorescence thin section is evaluated oiliness and is seen Fig. 6.
2, rock laser co-focusing determines densification and shale reservoir oiliness
Rock laser confocal methods (Sun Xianda etc., the new development of the micro-detection technique of laser confocal scanning in the Reservoir Analysis research of Daqing exploration area, rock journal the 5th phase in 2005) is utilized to obtain two dimension and the three-dimensional imaging of 60 core samples.Analysis conclusion is:
(1) mud stone oiliness
Qp1 well 1980-2000m mud stone oil-containing, but be present in grade-micron order hole on a small quantity, major part is adsorbed by kerogen.As Qp1 well 1987.62m mud stone organic components laser co-focusing three-dimensional imaging (Fig. 7) display, lightweight composite distribution less (in Fig. 7 A width) based on stable hydrocarbon in mud stone, with aromatic hydrocarbons, nonhydrocarbon, pitch is main heavy composite distribution more (in Fig. 7 B width), composite distribution based on crude oil more (in Fig. 7 C width), organic components based on kerogen distributes at most and absorption crude oil (in Fig. 7 D width), show the hydro carbons that mud stone generates and crude oil less, the oil component overwhelming majority is ADSORPTION STATE or nanoscale hole oil by kerogen absorption, little amount is present in grade-micron order hole, Qp1 well 1996.34m mud stone organic components laser co-focusing three-dimensional imaging (see figure 8), composite distribution more (in Fig. 8 A width) based on stable hydrocarbon in mud stone, based on the heavy composite distribution of aromatic hydrocarbons, nonhydrocarbon, pitch more (in Fig. 8 B width), show the hydro carbons that mud stone generates and crude oil more (in Fig. 8 C width), oil component major part is ADSORPTION STATE or nanoscale hole oil by kerogen absorption, is present on a small quantity (in Fig. 8 D width) in grade-micron order hole.
Equally, containing siltpelite and silty all oil-containings, the summary of grade-micron order hole oil ratio pure shale is many, and major part is adsorbed by kerogen.
(2) sandstone oiliness
Qp1 well 1989.84m siltstone organic components laser co-focusing three-dimensional imaging (Fig. 9), composite distribution based on stable hydrocarbon many (in Fig. 9 A width), based on the heavy composite distribution of aromatic hydrocarbons, nonhydrocarbon, pitch many (in Fig. 9 B width), composite distribution based on crude oil many (in Fig. 9 C width), the hydro carbons in sandstone and crude oil major part are present in grade-micron order hole and are adsorbed in ADSORPTION STATE or nanoaperture oil (in Fig. 9 D width) by kerogen in free state, on a small quantity.
(3) mud stone and sandstone oiliness contrast
Qp1 well 1982.554-1982.567m mud stone folder siltstone band laser co-focusing two dimensional image (Figure 10) display, in mud stone, oil is adsorbed by kerogen, and in siltstone band, oil is composed and is stored in the middle of sandstone particle, is mainly grade-micron order free oil.
In sum, the occurrence status of different lithology mud stone oil has difference, from mud stone, containing the oil of free state siltpelite to silty hole in increasing trend, but mainly to be adsorbed by kerogen; And siltstone oil majority is adsorbed in ADSORPTION STATE in free state, on a small quantity.
3, rock pyrolysis determines densification and shale reservoir oiliness
S1, S2 index of various lithology (siltstone, silty, containing siltpelite and mud stone) core sample is obtained with rock pyrolysis analysis (National Standard of the People's Republic of China, rock pyrolysis analysis GB/T18602-2001).
The S1 of rock pyrolysis analysis is the free hydrocarbon of in rock <300 DEG C, is equivalent to crude oil, and the larger oiliness of S1 value is better; S2 is the hydrocarbon thermal cracking of in rock 300-600 DEG C, is equivalent to kerogen, and S1/S2 reflects reservoir oiliness feature.The pyrolysis analysis of Qp1 well different lithology rock oiliness the results are shown in Table 1.Table 1 data can be found out, siltstone, silty, increase to 9.78mg/g and 11.22mg/g to mud stone S2 and S1+S2 mean value by 3.76mg/g and 5.11mg/g containing siltpelite, S1 then the highest with mud stone 1.44mg/g, siltstone 1.36mg/g takes second place, minimum for feature containing siltpelite 1.15mg/g.This be due to after the raw hydrocarbon of mud stone in its nanoscale pore network or microfracture diffusion aggregation, become nanoscale hole oil, part is adsorbed by kerogen; Reduce from siltstone to mud stone pore diameter and throat width, mud stone is maximum to the resistance of hydro carbons and oil migration, absorption affinity, after step-down of coring, departing from underground primal environment, hydro carbons and crude oil least easily scatter and disappear, and siltstone pore diameter and throat width maximum, minimum to the resistance of hydro carbons and oil migration, absorption affinity, easily scatter and disappear; The easiest migration and gathering in siltstone after mud stone row hydrocarbon.
The pyrolysis analysis of table 1Qp1 well different lithology rock oiliness
Note: the data on line are numerical range, and the data under line are mean value, in bracket, numerical value is sample size.
From Qp1 well different lithology reservoir oiliness rock pyrolysis evaluation map (Figure 11), the general S1/S2>0.2 reflection of siltstone, silty is containing grade-micron order hole oil feature, mud stone, then to reflect kerogen adsorbed oil or nanoscale hole oil feature containing siltpelite S1/S2<0.2, be increase tendency from mud stone, containing siltpelite, silty to the free state oleaginousness of siltstone, utilize S1/S2, S1, S1+S2 can evaluate different lithology reservoir oiliness feature.As S1/S2<0.2, S1>1.5mg/g, S1+S2>10mg/g in 1995.8-1997.4m mud stone section, reflection kerogen adsorbed hydrocarbons or nanoscale hole oil feature, 1989.6m-1991.1m siltstone well section S1/S2>>0.2, S1>2mg/g, S1+S2>10mg/g are reflected as containing grade-micron order hole oil.
4, sealing core drill oil saturation determines densification and shale reservoir oiliness
The sealing core drill oil saturation of various lithology (siltstone, silty, containing siltpelite and mud stone) core sample is measured (People's Republic of China's industry standard, core analysis method SY/T5336-2006).The results are shown in Figure 12.
Result: containing siltpelite, silty, siltstone (Figure 12) all oil-containings, be 14.32%-31.07% containing siltpelite, silty is 14.25%-36.58%, siltstone oil saturation is 19.57%-82.23%, from the trend containing siltpelite, silty to siltstone oil saturation being increase, show that in compact reservoir, siltstone self-enrichment is best, oiliness is obviously by lithologic character controlling, as the highest in 1989.7m-1990.2m siltstone oil saturation.
5, scanning electron microscope and power spectrum determine densification and shale reservoir oiliness
By environmental scanning or Flied emission Electronic Speculum microscopic observation is carried out to core sample and energy spectrum analysis (People's Republic of China's industry standard, rock sample scanning electron microscope analysis method SY/T5162-1997) determines whether containing micron-nanometer level oil.
Result: environmental scanning or Flied emission Electronic Speculum can realize micron-nanometer level oil microscopic observation, densification and mud shale micron-nanometer level oil are determined in recycling energy spectrum analysis further, as Figure 13 display environment scanning electron microscope microphoto (A width) and energy spectrum analysis figure (B width), containing micron-nanometer level oil in reflection Qp1 well 1994.64m silty hole, in inter-granular porosity adsorption-like.
Three) fine and close and shale reservoir oiliness comprehensive evaluation
On the basis of above-mentioned single item evaluation, the each single item evaluation result of integrated application carries out comprehensive evaluation to the different well section of Qp1 well and lithologic reservoir oiliness, mutually verify between each single item evaluation, complement one another, draw densification and shale reservoir oiliness comprehensive evaluation result.
Fine and close and shale reservoir oiliness comprehensive evaluation result is shown in Figure 14.Therefrom known, the siltstone pyrolysis S1 of 1989.82m is 5.06mg/g, sealing core drill oil saturation is 82.23%, fluorescence thin section oil content is 75%, and the rock pyrolysis S1 of 1985.89m be 0.71mg/g, sealing core drill oil saturation is 24.35%, fluorescence thin section oil content is 26%, visible 3 assay result consistance are good, mutually verify; The silty pyrolysis S1 of 1994.64m is 0.95mg/g, sealing core drill oil saturation is 28.61%, fluorescence thin section oil content is 30%, and Flied emission Electronic Speculum and energy spectrum analysis (see Figure 13) detect containing nanoscale oil, complement one another with other single analysis evaluation result.
Comprehensive evaluation different well section oiliness has difference, and mainly contain 4 containing well section, 1989.4m-1991.6m well section oiliness is the highest, 1984.0m-1987.2m well section is taken second place, 1992.4m-1995.4m is relatively low, 1998.5m-1999.8m is relatively minimum.Mud stone, have difference containing the oiliness of siltpelite, silty, siltstone, mud stone, containing siltpelite oil based on nanoscale hole oil, silty, siltstone are based on grade-micron order hole oil; From mud stone, but mainly to be adsorbed by kerogen in increasing trend containing free state oil siltpelite to silty hole; Siltstone oil is most in free state, on a small quantity in ADSORPTION STATE; Be increase tendency from mud stone, containing siltpelite, silty to the oleaginousness of siltstone.In shale layer, extensive development centimetre-sized and grade siltstone band are one of Main Reservoirs of fine and close oil, this is significant for being familiar with mud shale and densification oil Forming Mechanism and productivity contribution, also contributes to guiding Daqing exploration area exploration to accelerate to the oily Directional Extension of mud shale.
Specifically illustrate by example the overall process that the present invention carries out unconventional densification and shale reservoir oil bearing evaluation experimental technique above, the method oil bearing evaluation result can be used for the exploratory development such as unconventional densification and mud shale oil pressure split and produces.The present invention has following feature:
(1) propose and establish unconventional densification and shale reservoir oil bearing evaluation experimental technique, the experimental technique such as sealing core drill saturation degree or nuclear magnetic resonance, rock pyrolysis, fluorescence thin section, laser co-focusing, scanning electron microscope and power spectrum can be utilized unconventional densification and the individual event of shale reservoir oiliness and comprehensive evaluation, meet the demand of unconventionaloil pool exploratory development.Utilize sealing core drill saturation degree and fluorescence thin section technology can effective evaluation silty, siltstone oiliness, rock pyrolysis, laser co-focusing, scanning electron microscope and power spectrum can effective evaluation mud stone, siltstone oiliness, these technical indicators coordinate integrated application, mutually verify, complementing one another can the fine and close and shale reservoir oiliness of effective evaluation.
(2) this experimental technique is utilized to apply at Daqing exploration area unconventionaloil pool prospect pit Qp1 well, provide densification and shale reservoir different lithology, different well section oil bearing evaluation result and method, achieve mud stone, siltstone is oil-containing all, from mud stone, containing free state oil in siltpelite to silty hole in increasing trend, mainly adsorbed by kerogen, siltstone oil is most in free state, a small amount of in ADSORPTION STATE, from mud stone, containing siltpelite, silty is the understanding of increase tendency to the oleaginousness of siltstone, for unconventional densification and mud shale oil " seven property " evaluation study, pressure break and exploratory development are produced and are provided experimental basis.
(3) the unconventional densification in Daqing exploration area and mud shale oil aboundresources, it is the important resource replacement field of Daqing oil field, especially fine and close oil is the main reserved resources of " 4,000 ten thousand tons of hard stable yields, oil gas heavily go up 5,000 ten thousand ", unconventional densification and shale reservoir oil bearing evaluation experimental technique can be the unconventional fine and close oil-gas exploration and development in Daqing exploration area and provide technical support, have a extensive future.
Claims (9)
1. unconventional densification and a shale reservoir oil bearing evaluation experimental technique, is characterized in that, comprise following steps:
1) rock core drilled through is carried out on-the-spot supporting sampling by unconventional densification and shale reservoir sampling principle, obtain fine and close and shale reservoir core experiment sample;
2) by step 1) the unconventional densification that obtains and shale reservoir core experiment sample, the project assorted detection of experiment Analysis, obtains fine and close and shale reservoir core experiment analysis result; The project assorted detection of described experimental analysis comprises sealing core drill saturation degree or nuclear magnetic resonance spectroscopy, rock pyrolysis analysis, fluorescence thin section analysis, laser co-focusing analysis, scanning electron microscope and energy spectrum analysis;
3) by step 2) the unconventional densification that obtains and shale reservoir core experiment analysis result, rock pyrolysis, the evaluation of fluorescence thin section single experiment is carried out according to different lithology, utilize software to draw, obtain fine and close and shale reservoir oiliness single item evaluation figure and experimental evaluation result;
4) by step 3) the unconventional densification that obtains and shale reservoir oiliness single item evaluation figure and experimental evaluation result, carry out oiliness comprehensive evaluation, utilize software to draw, obtain fine and close and shale reservoir oiliness map of Complex evaluation and experimental evaluation result; Described densification and shale reservoir oiliness experiment comprehensive evaluation refer to utilize step 3) single experiment evaluation result mutually verify, complement one another.
2. unconventional densification according to claim 1 and shale reservoir oil bearing evaluation experimental technique, it is characterized in that, step 1) unconventional densification and mud shale boring sample principle get when being lithological change a set of, the continuous 1m of mud stone section at least gets two covers, Sandstone Section 0.2m at least gets a set of laboratory sample; Often overlap laboratory sample and include sample for sealing core drill saturation degree or nuclear magnetic resonance, rock pyrolysis, fluorescence thin section, laser co-focusing, scanning electron microscope and energy spectrum analysis.
3. unconventional densification according to claim 1 and 2 and shale reservoir oil bearing evaluation experimental technique, is characterized in that, step 3) described in different lithology be mud stone, containing siltpelite, silty, siltstone.
4. unconventional densification according to claim 1 and 2 and shale reservoir oil bearing evaluation experimental technique, is characterized in that, step 3) and step 4) draw unconventional densification and shale reservoir oil bearing evaluation figure and adopt card to run quickly mapping software.
5. unconventional densification according to claim 3 and shale reservoir oil bearing evaluation experimental technique, is characterized in that, step 3) and step 4) draw unconventional densification and shale reservoir oil bearing evaluation figure and adopt card to run quickly mapping software.
6. unconventional densification according to claim 1 and 2 and shale reservoir oil bearing evaluation experimental technique, it is characterized in that, step 1), 2), 3) and 4) unconventional densification and shale reservoir refer to the reservoir that factor of porosity is less than 12%, ground level air infiltration rate is less than 1mD.
7. unconventional densification according to claim 3 and shale reservoir oil bearing evaluation experimental technique, it is characterized in that, step 1), 2), 3) and 4) unconventional densification and shale reservoir refer to the reservoir that factor of porosity is less than 12%, ground level air infiltration rate is less than 1mD.
8. unconventional densification according to claim 4 and shale reservoir oil bearing evaluation experimental technique, it is characterized in that, step 1), 2), 3) and 4) unconventional densification and shale reservoir refer to the reservoir that factor of porosity is less than 12%, ground level air infiltration rate is less than 1mD.
9. unconventional densification according to claim 5 and shale reservoir oil bearing evaluation experimental technique, it is characterized in that, step 1), 2), 3) and 4) unconventional densification and shale reservoir refer to the reservoir that factor of porosity is less than 12%, ground level air infiltration rate is less than 1mD.
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