CN103983536A - Method for obtaining gas content of shale gas by utilizing well log curve - Google Patents
Method for obtaining gas content of shale gas by utilizing well log curve Download PDFInfo
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Abstract
The invention discloses a method for obtaining the gas content of shale gas by utilizing a well log curve, relates to the field of exploration geophysics, and particularly relates to a method for calculating the shale gas content by utilizing a well log curve on the basis of a shale hydrocarbon generation dynamics simulation test, an methane isothermal adsorption experiment and a resolution gas content test. The method comprises the following steps: acquiring the accumulative conversion rate of shale gas, the gas generation potential and the total amount of generated hydrocarbon gases according to a thermal simulation result; establishing the calculation relationship between the shale adsorption capability and TOC (total organic carbon) and calculating the average gas content; acquiring the gas content by utilizing field analysis and correcting the average gas content; and acquiring a unary linear regression equation and a binary linear regression equation of the shale gas content and the interval transit time and electrical resistivity by the shale gas content and a shale well log curve data linear regression which are obtained by the analysis experiment, thus calculating the shale gas content by utilizing the well log curve. Therefore, the calculation efficiency and the accuracy of the shale gas content of continental facies are improved obviously.
Description
Technical field
The present invention relates to exploration geophysics field, refer more particularly to a kind of method of utilizing logging trace calculating shale gas air content on the basis of shale hydrocarbon-generating dynamics simulation test, the experiment of methane isothermal adsorption and resolution gas content measuring.
Background technology
Shale air content is the requisite capsule information of shale exploratory development, selection and appraisal of exploration area and reservoir study, is the important parameter that calculates shale gas reserves formulation development plan.Because it exists with multiple phase in the self-contained unit of dark-coloured mud shale or high-carbon mud shale, therefore its evaluation method and development scheme are different from conventional gas and oil Tibetan.Along with improving constantly of shale gas exploratory development degree, the shale nonuniformity that faces is high, geologic objective is complicated and sample test cost is more and more higher, causes the past is carried out analysis purpose layer air content method by resolving one by one experiment to be difficult to meet the exploratory development needs of complex condition.Thereby be necessary to utilize a kind of all kinds of geologic features of means labor of Cheap highly effective, also need to have supporting logging technology method that its attribute is extracted and reflected.
Summary of the invention
The logging trace that utilizes that the invention provides a kind of Cheap highly effective obtains the method for terrestrial facies shale gas air content.
Step 1: in test shale gas field zone of interest, take out n piece core sample, will every be divided into three parts, first part of shale sample obtained logging trace and carry out scene parsing with resolving instrument mensuration under simulated formation temperature conditions, tentatively obtain shale gas air content;
Step 2: second part of shale sample carried out to hydrocarbon-generating dynamics simulation test, utilize dynamics matching software, the factor of created gase of hydrocarbon-generating dynamics simulated experiment result is calculated as to conversion ratio, record methane, C
2-C
5the potentiality of the raw hydrocarbon gas of instantaneous conversion rate, accumulation conversion ratio and sample between 50 DEG C of warm rank peak hydrocarbon-generating stages; The accumulation that utilizes known TOC value to calculate shale reality generates the amount of hydrocarbon gas;
Step 3: the 3rd part of shale sample carried out to isothermal adsorption experiment, obtain the main distribution range of maximum adsorption ability and the mean value of shale sample;
Step 4: the data of the TOC value in integrating step 2 and the experiment of step 3 isothermal adsorption, calculate shale adsorptive power;
Step 5: by step 2 and step 4 the data obtained, step 1 is resolved to experiment gained shale gas air content data and proofread and correct, by shale gas air content data and the linear regression of shale log data, obtain one-variable linear regression equation and the binary linear regression equation of shale gas air content and interval transit time, resistivity, and definite related coefficient;
Shale gas air content one-variable linear regression equation:
Cz
1=A* Δ t+B formula (1);
In formula, Cz
1for the shale gas air content calculating by one-variable linear regression equation, unit is m
3/ t; Δ t is interval transit time, and unit is μ s/m;
Shale gas air content binary linear regression equation:
Cz
2=A * Δ t-C*Rt+D formula (2);
In formula: Cz
2for the shale gas air content calculating by binary linear regression equation, unit is m
3/ t; Δ t is interval transit time, and unit is μ s/m; Rt is resistivity, and unit is Ω .m;
The shale gas air content drawing according to above two kinds of methods, calculates the arithmetic mean value of the total air content of shale
Cz=(Cz
1+ Cz
2)/2 formula (3);
Obtain shale gas air content.
Preferably, in described step 1, tentatively obtaining shale gas air content method is:
(1) record is resolved in instrument rock gas volume in time and the data of temperature variation, records and resolves tolerance and residual volume;
(2), by straight-line method and polynomial method matching analytic curve, counter pushing away derives from brill chance shale bed to the gas volume discharging between rock sample sealing, loses gas; Resolution gas, residual gas and loss gas three sum tentatively obtain shale gas air content shale gas air content.
More preferably, the method that records residual volume in described step 1 is:
(1) resolve speed and obtain residual volume lower than the method by rising resolution temperature after 1.5ml/min;
(2) after step (1), resolve speed lower than after 10ml/d, after being smashed, rock sample grinding records residual volume.
Or preferably, the TOC value in described step 2 can utilize Exxon TOC computation model (Δ lgR) to obtain:
formula (4);
formula (5).
Or preferably, described step 3 isothermal adsorption experiment utilizes Lan Shi isothermal adsorption patterns: Gs=VL*P/ (PL+P), and wherein experimental temperature is corresponding formation temperature, and oil bath pan temperature control precision is 0.1 DEG C, and pressure measurement accuracy is 0.1psi; In formula, Gs represents shale maximum adsorption ability under formation condition; VL is Langmuir volume (being the gas absorption amount under infinitely great pressure), and PL is Langmuir pressure-constant (pressure when absorption tolerance equals 1/2nd Langmuir volumes), and P is reservoir pressure.
Or preferably, in described step 4 by comparative study shale adsorptive power the variation characteristic in plane and longitudinally, the relation of comparative study shale adsorptive power and on-the-spot resolution gas content simultaneously, set up the calculated relationship between shale adsorptive power Q suction and TOC:
Q suction=E × TOC+F; (formula 6);
Wherein, the value of E and F is drawn by isothermal adsorption experiment.
Or preferably, in the zone of interest of described shale gas field, each sample is homogeneous terrestrial facies shale.
Or preferably, the total air content of described shale utilizes USBM method to calculate.
Advantage of the present invention is:
(1) fully take into account the nonuniformity of shale reservoir, solved the problem that physical property that the difference of each reservoir samples embodies, organic carbon, adsorptive power, gas-bearing property etc. there are differences;
(2) by all core analysis samples in each reservoir are divided into groups, expand sample space, strengthened the weight with typicalness and representative sample, improved the accuracy of calculating;
(3) application logging trace calculates shale gas air content, has developed the method that air content is calculated, and is more conducive to set up the relation between shale electrical property feature and air content, reaches efficient and easy object.
Brief description of the drawings
Fig. 1 is methane gas instantaneous conversion rate in the simulated experiment of step 2 hydrocarbon-generating dynamics.
Fig. 2 is methane gas accumulative total conversion ratio in the simulated experiment of step 2 hydrocarbon-generating dynamics.
Fig. 3 is C in the simulated experiment of step 2 hydrocarbon-generating dynamics
2-C
5gas instantaneous conversion rate.
Fig. 4 is C in the simulated experiment of step 2 hydrocarbon-generating dynamics
2-C
5gas accumulative total conversion ratio.
Fig. 5 is the actual instantaneous conversion rate of methane gas.
Fig. 6 is the actual accumulative total of methane gas conversion ratio.
Fig. 7 is that Fig. 3 is C
2-C
5the actual instantaneous conversion rate of gas.
Fig. 8 is C
2-C
5the actual accumulative total of gas conversion ratio.
Fig. 9 is X gas field shale sample TOC value and adsorptive power graph of a relation.
Figure 10 is that shale gas is directly resolved air content and one-variable linear regression equation calculates air content linear dependence figure.
Figure 11 is that in step 5, shale gas is directly resolved air content and binary linear regression equation calculating air content linear dependence figure.
Figure 12 is the long 7 shale resolution gas content of well and log curve correlation result.
Taking shale gas field of Southeast Area of Ordos Basin, (numbering X district) extends group leader's 7 Zhang Jia beach shale as example, in conjunction with on-the-spot parsing, hydrocarbon-generating dynamics simulated experiment and isothermal adsorption experiment, utilizes logging trace to calculate terrestrial facies shale gas air content, and step is as follows:
First set y pound sign of test oil district zone of interest, in the default degree of depth to zone of interest coring, be respectively yy-1 ... ..yy-n, utilize rock core Physical Property Analysis instrument to test out corresponding parameter in these rock cores, and the well logging of corresponding rock core, log data, sample is divided into three groups, is respectively yy-1-1, yy-1-2, yy-1-3, yy-2-1, yy-2-2, yy-2-3 are until yy-y-3.
Step 1: by the first duplicate samples on-the-spot parsing under simulated formation temperature conditions, measure the gas flow naturally desorbing in shale sample; Method by rising resolution temperature after parsing speed is lower than 1.5ml/min obtains residual volume, then derive from brill chance shale bed to the gas volume discharging between rock sample sealing by straight-line method and counter the pushing away of polynomial method matching analytic curve, lose gas, resolution gas and residual gas sum tentatively obtain shale gas air content shale gas air content.
Resolution speed before reaching formation temperature is generally between 2-3ml/min, reach formation temperature resolution speed afterwards and become gradually large, generally can reach 8-10ml/min, be that in drilling and coring delivery process, to lose tolerance less, on-the-spot gas content (resolution gas+residual gas) of directly resolving, slightly lower than actual air content, can represent the true air content of shale substantially.Above shale sample resolution gas content (directly resolution gas) mainly concentrates on 1.2 ~ 1.8m
3between/t, average out to 1.65m
3/ t, reaches as high as 3.3m
3/ t(table 1).
Table 1 X gas field shale sample resolution data table
Note: "/" represents not test this item number certificate
Step 2: second part of shale sample carried out to the hydrocarbon-generating dynamics simulated experiment under open system.In sample heating process, methane gas starts raw hydrocarbon after 400 DEG C, has reached raw hydrocarbon peak in the time of 500 DEG C-550 DEG C, slowly reduces afterwards.In the time of 1000 DEG C, raw methane finishes substantially, and the ability of the raw methane of sample has reached the limit.The formation stages of ethane gas is more concentrated, since 400 DEG C of formation, reaches and forms peak at 450-500 DEG C, and 600 DEG C are finished substantially.C
2-C
5the stage productive rate variation diagram of gas is similar with ethane, since 400 DEG C of formation, reaches and forms peak at 450-500 DEG C, and 600 DEG C are finished substantially.
Utilize dynamics matching software, the factor of created gase of hydrocarbon-generating dynamics simulated experiment is calculated as to conversion ratio.Obtain and reach 25% 50 DEG C of warm rank methane instantaneous conversion rates, accumulation conversion ratio reaches 40%, C
2-C
5gas instantaneous conversion rate 40 ~ 45%, accumulation conversion ratio is greater than 60%(as Fig. 1-Fig. 4); The potentiality that calculate generation methane are 85.36 ml/gTOC, generate C
2-C
5potentiality be 33.42 ml/gTOC, add up to that to generate total potentiality of hydrocarbon gas be 118.78 ml/gTOC, wherein, the calculating of TOC value by and draw, the rock gas of formation forms wetter, heavy hydrocarbon gas content is relatively high.
In conjunction with hydrocarbon-generating dynamics simulated experiment, in wellblock, the long 7 sections of actual overall yields of gas of Triassic Yanchang Formation are 53.5 ml/gTOC, and wherein methane and C2-C5 gas actual yield are respectively 29.9 ml/gTOC and 23.6 ml/gTOC(as Fig. 5-Fig. 8).According to the shale organic carbon content of setting up and the relation of unit shale sample amount of coalbed methane generated
, utilizing TOC data to calculate shale sample and generate hydrocarbon gas total amount between 1.23 ~ 4.01 m3/t, average amount of coalbed methane generated is 2.30 m3/t.
Step 3: utilize 300 type isothermal adsorption instruments to carry out isothermal adsorption experiment to triplicate sample.Experimental result shale maximum adsorption ability maximal value is 3.38m3/t, and minimum value is 0.52m3/t, is mainly distributed between 1.2 ~ 2.8m3/t, on average can reach 1.82m3/t(table 2).
2 gas field shale methane isotherm adsorption data accorded tables
Step 4: the variation characteristic of comparative study shale adsorptive power in plane and longitudinally, the relation of comparative study adsorptive power and on-the-spot resolution gas content simultaneously, utilizes aforementioned gained maximum adsorption ability and corresponding sample TOC, sets up the experimental formula of calculated relationship.Then utilize the TOC value of shale sample to calculate the maximum adsorption ability of shale sample.As in Fig. 9 being X gas field shale sample TOC value and adsorptive power graph of a relation.
Q inhales=0.2339 × TOC+0.0494
Step 5: by step 2 and step 4 the data obtained, step 1 is resolved to experiment gained shale gas air content data and proofread and correct, by shale gas air content data and the linear regression of shale log data, obtain shale gas air content (parsing tolerance) and also determine related coefficient (as Figure 10, Figure 11) with monobasic and the binary linear regression equation of interval transit time, resistivity, total air content that two kinds of computing method are obtained is averaged, and obtains individual well air content in district.
Shale gas air content one-variable linear regression equation:
Cz1=0.0047*Δt+0.1748
Shale gas air content binary linear regression equation:
Cz2=0.0047*Δt-0.0001*Rt+0.1815
Completing the direct resolution gas of long 7 shale in district based on above two kinds of computing method calculates, account for 78.5% of total shale air content according to direct resolution gas, calculate the total air content of individual well shale, total air content that two kinds of computing method are obtained is averaged, obtain individual well air content (table 3) between 1.87-2.04m3/t in district, finally get arithmetic mean, determine that air content is 2.0 m3/t.Taking yy16 well as example, resolution gas content and the logging trace of the long 7 shale samples of contrast, find that both have obvious correlativity, as Figure 12.
The long 7 shale section air content computational data tables in 3 gas fields
From above-described embodiment, utilize each layer of inner sample to resolve experiment, raw hydrocarbon potentiality test and adsorptive power test, by calculating relation between resolution gas content and air content, and with the linear regression of shale log data, obtain one-variable linear regression equation and the binary linear regression equation of shale gas air content and interval transit time, resistivity, obviously improved counting yield and the accuracy of terrestrial facies shale gas air content.
Claims (8)
1. utilize logging trace to obtain a method for shale gas air content, it is characterized in that: comprise the steps:
Step 1: in test shale gas field zone of interest, take out n piece core sample, will every be divided into three parts, first part of shale sample obtained logging trace and carry out scene parsing with resolving instrument mensuration under simulated formation temperature conditions, tentatively obtain shale gas air content;
Step 2: second part of shale sample carried out to hydrocarbon-generating dynamics simulation test, utilize dynamics matching software, the factor of created gase of hydrocarbon-generating dynamics simulated experiment result is calculated as to conversion ratio, record methane, C
2-C
5the potentiality of the raw hydrocarbon gas of instantaneous conversion rate, accumulation conversion ratio and sample between 50 DEG C of warm rank peak hydrocarbon-generating stages; The accumulation that utilizes known TOC value to calculate shale reality generates the amount of hydrocarbon gas;
Step 3: the 3rd part of shale sample carried out to isothermal adsorption experiment, obtain the main distribution range of maximum adsorption ability and the mean value of shale sample;
Step 4: the data of the TOC value in integrating step 2 and the experiment of step 3 isothermal adsorption, calculate shale adsorptive power;
Step 5: by step 2 and step 4 the data obtained, step 1 is resolved to experiment gained shale gas air content data and proofread and correct, by shale gas air content data and the linear regression of shale log data, obtain one-variable linear regression equation and the binary linear regression equation of shale gas air content and interval transit time, resistivity, and definite related coefficient;
Shale gas air content one-variable linear regression equation:
Cz
1=A* Δ t+B formula (1);
In formula, Cz
1for the shale gas air content calculating by one-variable linear regression equation, unit is m
3/ t; Δ t is interval transit time, and unit is μ s/m;
Shale gas air content binary linear regression equation:
Cz
2=A * Δ t-C*Rt+D formula (2);
In formula: Cz
2for the shale gas air content calculating by binary linear regression equation, unit is m
3/ t; Δ t is interval transit time, and unit is μ s/m; Rt is resistivity, and unit is Ω .m;
The shale gas air content drawing according to above two kinds of methods, calculates the arithmetic mean value of the total air content of shale
Cz=(Cz
1+ Cz
2)/2 formula (3);
Obtain shale gas air content.
2. a kind of method of utilizing logging trace to obtain shale gas air content as claimed in claim 1, is characterized in that: in described step 1, tentatively obtaining shale gas air content method is:
(1) record is resolved in instrument rock gas volume in time and the data of temperature variation, records and resolves tolerance and residual volume;
(2), by straight-line method and polynomial method matching analytic curve, counter pushing away derives from brill chance shale bed to the gas volume discharging between rock sample sealing, loses gas; Resolution gas, residual gas and loss gas three sum tentatively obtain shale gas air content shale gas air content.
3. a kind of method of utilizing logging trace to obtain shale gas air content as claimed in claim 2, is characterized in that: the method for described survey residual volume is:
(1) resolve speed and obtain residual volume lower than the method by rising resolution temperature after 1.5ml/min;
(2) after step (1), resolve speed lower than after 10ml/d, after being smashed, rock sample grinding records residual volume.
4. a kind of method of utilizing logging trace to obtain shale gas air content as claimed in claim 1, is characterized in that: the TOC value in described step 2 can utilize Exxon TOC computation model (Δ lgR) to obtain:
formula (4);
formula (5).
5. a kind of method of utilizing logging trace to obtain shale gas air content as claimed in claim 1, it is characterized in that: described step 3 isothermal adsorption experiment utilizes Lan Shi isothermal adsorption patterns: Gs=VL*P/ (PL+P), wherein experimental temperature is corresponding formation temperature, oil bath pan temperature control precision is 0.1 DEG C, and pressure measurement accuracy is 0.1psi; In formula, Gs represents shale maximum adsorption ability under formation condition; VL is Langmuir volume (being the gas absorption amount under infinitely great pressure), and PL is Langmuir pressure-constant (pressure when absorption tolerance equals 1/2nd Langmuir volumes), and P is reservoir pressure.
6. a kind of method of utilizing logging trace to obtain shale gas air content as claimed in claim 4, it is characterized in that: in described step 4 by comparative study shale adsorptive power the variation characteristic in plane and longitudinally, the relation of comparative study shale adsorptive power and on-the-spot resolution gas air content simultaneously, set up shale adsorptive power Q and inhale the calculated relationship between TOC:
Q suction=E × TOC+F; Formula (6);
Wherein, the value of E and F is drawn by isothermal adsorption experiment.
7. a kind of method of utilizing logging trace to obtain shale gas air content as claimed in claim 1, is characterized in that: in the zone of interest of described shale gas field, each sample is homogeneous terrestrial facies shale.
8. a kind of method of utilizing logging trace to obtain shale gas air content as claimed in claim 7, is characterized in that: described shale gas air content utilizes USBM method to calculate.
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