CN103852569A - Method for determining gas production rate of organic matrix in biochemical gas production stage - Google Patents
Method for determining gas production rate of organic matrix in biochemical gas production stage Download PDFInfo
- Publication number
- CN103852569A CN103852569A CN201210511237.7A CN201210511237A CN103852569A CN 103852569 A CN103852569 A CN 103852569A CN 201210511237 A CN201210511237 A CN 201210511237A CN 103852569 A CN103852569 A CN 103852569A
- Authority
- CN
- China
- Prior art keywords
- hydrocarbon
- toc
- source rock
- prime
- rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a method for determining a gas production rate of an organic matrix in a biochemical gas production stage, and belongs to the technical field of oil and gas resource evaluation. The method comprises the following specific steps: collecting four characterization parameters of a source rock in the biochemical gas production stage of one area, namely residual hydrocarbon amount of chloroform bitumen "A", vitrinite reflectance Ro reflecting the thermal evolution degree of the source rock, organic carbon content TOC and burial depth h; establishing a graph of relation of "A"/TOC and Ro or h according to the characterization parameters of the source rock; determining the exhaust threshold of a biogenic gas according to the graph, wherein the value at the threshold is "A"<0>/TOC<0>; calculating the restoration index of the hydrocarbon generation rate of the source rock according to "A"/TOC and "A"<0>/TOC<0> under different Ro or h conditions, and calculating the total hydrocarbon generation rate of the source rock under a variety of maturity conditions through the index and the "A"<0>/TOC<0>; calculating the gas production rate of the biogenic gas of the source rock according to the difference value of the total hydrocarbon generation rate and the residual hydrocarbon rate. By adopting the method, the problems of the original methods of calculating gas production rate, such as simulation experiment and the like are solved, and important technical support is provided for biogenic gas resource evaluation.
Description
Technical field
The present invention relates to oil and gas resource evaluation technical field, particularly relate to hydrocarbon source rock in low-maturity period, the biogas stock number calculating aspect generating in biochemical gas-genous stage, to utilize the data such as chloroform bitumen " A " value, total content of organic carbon TOC value, buried depth h value and Ro value in hydrocarbon source rock characterization parameter, according to hydrocarbon source rock always raw hydrocarbon amount equal to discharge the principle of hydrocarbon amount and residual hydrocarbons amount sum, determine a kind of method of organic matrix at biochemical gas-genous stage biogas factor of created gase.
Background technology
TISSOT proposes in the four-stage of hydrocarbon primary rock producing hydrocarbon, and biochemical gas-genous stage is the starting stage that oil gas generates, and it is more shallow that the feature in this stage is that stratum is buried, generally be no more than 1500m, simultaneous temperature pressure is lower, and the hot evolution level of source rock is lower, and vitrinite reflectance Ro is generally no more than 5%.All the time, the biogas that biochemical gas-genous stage generates receives much concern, it refers in the temperature environment of normal temperature or not bery high (below 60-70 degree), by the biochemical reaction of anaerobe, decomposes contained organic principle in stratum and the gas taking methane gas as principal ingredient that generates.It is estimated, in the rock gas total reserves of having found in the world, biogenic gas can account for more than 20%.Because this distribution of gas is extensive, a considerable number of, the more important thing is because it generally buries more shallow, build environment ratio is easier to prediction, compared with large-scale oil pool as the national economy main body energy, all more convenient on exploration and development, more favourable for the exploitation that disperse, so in recent years, biogas is subject to the attention of energy sector of various countries day by day.But due to history, the amount of coalbed methane generated which data can calculate or estimate biogas according to is a problem always, and this biogas RESERVE EVALUATION difficult problem will be solved, and most critical is exactly asking for of biogas factor of created gase.
For asking for of biogas factor of created gase, forefathers used a lot of methods, be fermented into gas experimental method except obtaining the microorganism of broad research and application always, the method for already having reported at present also have chemical dynemics, biochemical kinetics method, carbon isotopic equilibrium method, raw hydrocarbon potentiality method and inquiring into have an element balance method etc.
Lu Weiwen etc. propose for 1991 in " estimation of Biogas-generated Quantity in biogas simulation generation experiment and stratum " article of the 13rd the 1st phase of volume of oil experimental geology report, utilize biogas simulation to generate experiment, obtain and evaluate the required factor of created gase parameter of Biogas-generated Quantity, according to these experiment parameters obtaineds, by calculating organic carbon year depletion rate and depletion coefficient, calculate again the residual ratio of organic carbon, finally calculate the factor of created gase average out to 100m of biogas
3/ t.
Guan Deshi etc. 1997 are in " the produce and evolution pattern of biogas " article of the 18th the 3rd phase of volume of petroleum journal, utilize biogas to generate simulated experiment, in different experimental temperatures, under different experimental period, the factor of created gase scope that draws biogas is 51.07-97.79 m
3/ t.
Gao Ling etc. generate simulated experiment by biogas and draw average desirable 60 m of biogas factor of created gase for 1998 in " Baoshan Basin in Yunnan Province biogas generates simulated experiment and biogas resources " article of the 25th the 4th phase of volume of Chengdu University of Technology's journal
3/ t.
Wang Min etc. 2007 are in " chemical dynamic model and application thereof that biogas generates " article of the 81st the 3rd phase of volume of geology journal, in the microbiological anaerobic fermentation method generally adopting for domestic and international evaluation biogas stock number, can not reflect the deficiency of angry phase, from chemical kinetics angle, model is organic to be generated the chemical dynamic model of biogas and in conjunction with biogas productive rate data under experiment condition, finally establishes biogas factor of created gase numerical value more accurately.
In " evaluating carbon isotopic equilibrium method and the application thereof of Biogas-generated Quantity, generation " article of the biogas in deposition the 26th the 2nd phase of volume of journal in 2008 such as Lu Shuanfang, utilize carbon isotopic equilibrium method, regardless of the formation mechanism of biogas, the organic matter before conversion and transform after remnant organic matter and product
13c,
12the total amount of C should this principle of conservation, calculates the amount that loose distant basin I, II, the organic accumulative total of III type produce biogenesis methane gas and is about respectively 193. 94 m
3/ t, 175. 64 m
3/ t, 161. 71 m
3/ t.
Lu Shuanfang etc. 2008 are in " tell and breathe out element balance method and the application thereof that basin biogas-low ripe gas is evaluated " article of deposition the 26th the 6th phase of volume of journal, utilize element balance method, it is the generation of biogas, regardless of its mechanism, it is all the process of organic C, H, O loss, so just can calculate amount of coalbed methane generated according to the loss amount of organic C, H, O element, and then calculate this principle of biogas factor of created gase, calculating and telling basin, Kazakhstan II type biogas factor of created gase organic and III type organic matter is respectively 134.40m
3/ t, 83.99m
3/ t.
Zhu Houqin etc. arrange hydrocarbon thresholding theory with regard to utilization in 2008 in " Principle and application of raw hydrocarbon potentiality method research hydrocarbon source rock row hydrocarbon feature " article of the 3rd phase of Oil Exploration in China journal, according to source rock pyrolysis parameters of rock S
1, S
2, the data such as TOC, ask for row's hydrocarbon rate of hydrocarbon source rock, and then ask for factor of created gase.
Comprehensive existing Experiment Result and the result of calculation analyzed, and with reference to domestic and international related documents, biogas productive rate value range should be 40-100m
3/ t(organic matter).Although utilize laboratory facilities, the process that in simulating nature circle, biogas occurs, finally utilize biogas simulated experiment data can obtain factor of created gase value, but also there is the deficiency of following 3 aspects in this method: (1) simulated experiment can not provide the growing amount of different buried depth place biogas on geologic section, but the biogas that different buried depth generates, to the contribution margin difference that becomes to hide.(2) same sample different time, different researchers simulated experiment result differ greatly, and show that gas production rate is relevant with experiment condition (bacterial classification, fermentation condition, nutrient solution), and the credibility of data can not be guaranteed.(3) laboratory experiment condition and actual geologic condition differ greatly, and the biogas that simulated experiment produces can not ensure from the contribution margin of geology organic matter, and the objectivity of result is not strong.Generally speaking, the drawback that the method for this definite factor of created gase exists is: due to the singularity of geologic condition, under experiment condition, the simulation factor of created gase of laboratory sample can not objectively represent the factor of created gase under physical condition.
Forefathers have solved to a certain extent simulated experiment by some theoretical calculation methods of being and have asked for the Problem of Objectivity of factor of created gase simultaneously, but these methods that are based upon on material balance basis all exist self very big defect; Element balance method and carbon isotopic equilibrium method etc. wherein, with regard to only represent the inversion equilibrium of whole organic matter by the balance of the individual element such as C, H, have very strong one-sidedness; The methods such as the chemomotive force method wherein also experimental data of utilizing are more or less affected result of calculation objectivity; Raw hydrocarbon potentiality method wherein, the S of utilization
1, S
2all must pass through a large amount of Pyrolysis Experiment gained etc. data, more difficult obtaining of data, the method is generally only applied to asking for of thermal degradation oil generation gas stage or thermo cracking condensategenous stage product hydrocarbon rate simultaneously, asking for of biogas factor of created gase to biochemical gas-genous stage is also a tera incognita, moreover S
2in composition uncertainty very large, the result asked for of impact.
Therefore the present invention, after the deficiency of asking for biological factor of created gase the whole bag of tricks of recognizing in the past, has proposed a kind of method of organic matrix at biochemical gas-genous stage factor of created gase of determining.The method has replaced traditional biogas analogue experiment method, equal residual hydrocarbon amount and this conservation of matter principle of summation of discharging hydrocarbon amount in hydrocarbon source rock according to the raw hydrocarbon amount of source rock, raw row's hydrocarbon feature of the source rock based on biochemical gas-genous stage, be the hydrocarbon amount that generates of organic matrix except the chloroform bitumen " A " remaining in source rock, other substantially with the form discharge of biogas; Substitute with " A " the source rock pyrolysis data S that in the past used morely
1, S
2;study source rock row hydrocarbon feature with " A "/TOC, and then ask for the biogas factor of created gase in this stage.Meanwhile, there is following advantage in the method: (1), with respect to the more biogas analogue experiment method of asking for biogas factor of created gase and using in the past, the method is based on the analytical approach of pure theory value, and the factor of created gase value result of determining is very objective, and precision is high; (2) with respect to other several theoretical calculation methods, the theoretical principle of the method is actual, and the data simultaneously relying on is easily obtained, and is mainly the collection of total content of organic carbon TOC, residual hydrocarbon amount chloroform bitumen " A ", avoid as pyrolysis parameters of rock S
1, S
2the drawback that is difficult to obtain; (3) what the method was determined is the factor of created gase of biological gas generating phase biogas, has broken away from the theoretical limitation of only asking for oil generation gas stage oil gas conversion ratio of calculating in the past; (4) step of the method understands, flow process is simple, and quick and easy for asking for of factor of created gase, work efficiency is high.
Specifically, the party's ratio juris is that in the time that hydrocarbon source rock does not reach the thresholding buried depth of biogas discharge, the hydrocarbon that source rock generates is all composed and is stored in source rock with the form of residual hydrocarbons, now always gives birth to hydrocarbon amount and equals residual hydrocarbon amount; When source rock reaches a large amount of thresholding buried depths of discharging of biogas when following, the hydrocarbon of generation is just mainly discharged hydrocarbon source rock with the form of biogas, now source rock always raw hydrocarbon amount equal source rock residual hydrocarbon amount and source rock discharge hydrocarbon amount sum; Being embodied in the hot evolution level of " A "/TOC and source rock or buried depth graph of relation is, on the flex point of envelope, the organic residual hydrocarbon amount of source rock unit " A "/TOC value can represent the raw hydrocarbon amount of source rock unit's organic carbon, under the flex point of envelope, the organic residual hydrocarbon amount of source rock unit " A "/TOC just just arranges the hydrocarbon amount that remains in source rock inside after hydrocarbon, at this moment must recover the total raw hydrocarbon amount of source rock, finally the row's of utilization hydrocarbon amount equals always to give birth to the hydrocarbon amount principle poor with residual hydrocarbon amount, and the organic hydrocarbon amount of arranging of the unit of utilization is asked for biogas factor of created gase.Utilize the method to ask for some and lack source rock pyrolysis parameters of rock aspect data or the not high regional biogas factor of created gase of pyrolysis data confidence level, there is very strong applicability.In an embodiment of the present invention, because Caidamu Basin source rock pyrolysis parameters of rock data are few, and it is easy to obtain chloroform bitumen " A " data, utilizes the method to ask for biogas factor of created gase just very convenient, and degree of accuracy is very high.
Summary of the invention
In order to solve the problem of biogas resource evaluation difficulty, for the various deficiencies of asking in the methods such as the applied simulated experiment of biogas factor of created gase in the past, the present invention proposes a kind of method of organic matrix at biochemical gas-genous stage factor of created gase of determining, the method comprises:
By chloroform bitumen " A " and family's component analysis experiment and vitrinite reflectance analysis experiment, obtain residual hydrocarbon amount chloroform bitumen " A " value of multiple places, a certain region in biochemical gas-genous stage hydrocarbon source rock, vitrinite reflectance Ro value, organic carbon content TOC and tetra-characterization parameters of buried depth h of reflection Thermal Evolution of Source Rocks degree;
Draw " A "/TOC and hydrocarbon source rock vitrinite reflectance Ro or buried depth h graph of relation according to hydrocarbon source rock characterization parameter;
According to " A "/TOC and Ro or h graph of relation, determine a large amount of exhaust thresholdings of discharging of biochemical gas-genous stage biogas, the value that this thresholding is corresponding is " A
0"/TOC
0;
According to " A " of exhaust thresholding
0/ TOC
0be worth the index of recovery μ that determines hydrocarbon primary rock producing hydrocarbon rate from " A "/TOC value of hydrocarbon source rock reality under different Ro or h condition, and according to index of recovery μ and " A "
0/ TOC
0determine the total raw hydrocarbon rate of hydrocarbon source rock biochemical gas-genous stage under different Ro or buried depth h condition;
Determine the factor of created gase of organic matrix biogas in hydrocarbon source rock according to total raw hydrocarbon rate and residual hydrocarbon rate difference, the hydrocarbon amount that unit organic carbon is discharged.
Described multiple places should be uniformly distributed in study area, make sampling spot cover the whole district, to accomplish the applicability of the whole district.
Described biochemical gas-genous stage refers to the starting stage that oil gas generates, this stage, source rock buries more shallow, temperature, pressure is lower, evolution level is lower, vitrinite reflectance Ro is generally no more than 0.5%, and the methane gas that the hydro carbons of generation is mainly generated by the biochemical degradation of microorganism is main.
Described hydrocarbon source rock characterization parameter comprises total content of organic carbon TOC, residual hydrocarbon amount chloroform bitumen " A ", hydrocarbon source rock buried depth h value and vitrinite reflectance Ro value four item number certificates;
Described according to source rock characterization parameter, the concrete steps of making " A "/TOC and source rock hot evolution level vitrinite reflectance Ro or buried depth h graph of relation are:
Utilize residual hydrocarbon amount chloroform bitumen " A " and source rock total content of organic carbon TOC to determine unit organic carbon residual hydrocarbon amount " A "/TOC;
Taking vitrinite reflectance Ro or buried depth h as ordinate, make " A "/TOC and the hot evolution level of source rock or buried depth graph of relation taking each Ro or " A "/TOC corresponding to h as horizontal ordinate, one of them is with the longitudinal scale of vitrinite reflectance Ro, and one with the longitudinal scale of buried depth h.
The a large amount of exhaust thresholdings of discharging of described biogas, refer to the point of horizontal ordinate maximum on " A "/TOC and Thermal Evolution of Source Rocks degree or buried depth graph of relation, on this buried depth, " A "/TOC strengthens with the increase of source rock evolution level or buried depth, " A "/TOC reducing and reduce with source rock evolution level (or buried depth) under this buried depth, be point of inflexion on a curve, the value that this point is corresponding is " A
0"/TOC
0.
The concrete acquiring method of index of recovery μ of the raw hydrocarbon amount of described source rock is:
1) index of recovery of organic carbon is determined method;
According to invalid carbon conservation formula C in organic carbon in source rock evolutionary process
0(1-D
0)=C
t(1-D
t) can obtain 2. formula
C
0=μ×C
T ①
C
0/C
T=(1-D
T)/(1-D
0) ②
From 1. 2., μ=(1-D
t)/(1-D
0)
Wherein μ-index of recovery, %; C
t-remaining organic carbon, %; C
0-original organic carbon, %; D
0-original degraded the rate of diving, %; D
t-remaining degradation rate, %; D
tcan calculate and try to achieve by collected data, D
0comprehensively D
task for thermal degradation peak temperature plate;
The relation that the recovery of organic carbon and raw hydrocarbon index recover;
Because of A
0=" A
0"/TOC
0with A=" A "/TOC are all functions of Organic Carbon TOC, organic carbon is recovered, just can recover original " A "/TOC of geology period of history, while supposing vitrinite reflectance Ro or buried depth h, the residual hydrocarbon rate of the source rock of hydrocarbon source rock is " A "/TOC, original residual hydrocarbon rate is " A "/TOC ', determines that according to original organic carbon index of recovery the original raw hydrocarbon of this buried depth for measuring is:
" A "/TOC '=(Co/CT) * " A "/TOC, then ask for raw hydrocarbon amount according to this, equal original raw hydrocarbon amount and deduct residual hydrocarbon amount.
2) give birth to hydrocarbon rate index of recovery and determine method;
The index of recovery μ of the raw hydrocarbon rate of described source rock also can be calculated as according to formula:
The wherein residual hydrocarbon rate of the following hydrocarbon source rock of " A "/TOC-exhaust thresholding, i.e. the residual hydrocarbon amount of unit mass organic carbon reality, mg/g; " A "
0/ TOC
0the critical raw hydrocarbon rate of-exhaust thresholding place hydrocarbon source rock, i.e. the hydrocarbon amount of the critical generation of unit mass organic carbon, mg/g; The index of recovery of μ-hydrocarbon primary rock producing hydrocarbon rate, dimensionless; TOC is organic carbon content, %; " A " is the residual hydrocarbon amount chloroform bitumen of hydrocarbon source rock, mg/g;
The described hydrocarbon source rock always formula of raw hydrocarbon rate is:
Wherein μ-index of recovery, dimensionless; q
p-hydrocarbon source rock is raw hydrocarbon rate always, i.e. the total hydrocarbon amount generating of unit mass organic carbon, mg/g; HCI
pthe critical raw hydrocarbon rate of-exhaust thresholding place hydrocarbon source rock, i.e. the hydrocarbon amount of the critical generation of unit mass organic carbon, mg/g.
The concrete steps that described biogas factor of created gase is asked for are:
(1) calculate hydrocarbon source rock row hydrocarbon rate, concrete formula is:
Wherein q
e-hydrocarbon source rock row hydrocarbon rate, the hydrocarbon amount that unit mass organic carbon is discharged, mg/g; q
0the residual hydrocarbon rate of the following hydrocarbon source rock of-exhaust thresholding, i.e. the residual hydrocarbon amount of unit mass organic carbon reality, mg/g; μ-index of recovery;
(2) again according to unit conversion formula 1mg/g=1.43m
3/ t
cthe biological gas factor of created gase of the hydrocarbon source rock K under Temperature-pressure Conditions that settles the standard is:
K=q
e·1.43m
3/t
c；
Wherein K-factor of created gase, m
3/ t
c; t
c-organic carbon per ton.
Because organic matrix in biochemical gas-genous stage hydrocarbon source rock, the hydro carbons generating is gas substantially, this is biogas for the alkyl that hydrocarbon source rock is discharged, be easy to diffusion and discharge, residual little in hydrocarbon source rock, moreover, the hydrocarbon source rock residual hydrocarbon amount chloroform bitumen " A " of choosing is liquid residual hydrocarbon, containing gas, so the factor of created gase of organic matrix equals row's hydrocarbon rate of hydrocarbon source rock, i.e. row's hydrocarbon amount of unit mass organic carbon in biochemical gas-genous stage hydrocarbon source rock.
The present invention is based on the raw hydrocarbon amount of source rock and equal to discharge the conservation of matter principle of hydrocarbon amount and residual hydrocarbons amount sum, only just calculate organic matrix biogas factor of created gase in biochemical gas-genous stage source rock with several a small amount of hydrocarbon source rock characterization parameters that easily obtain, solve traditional foundation organic biogas simulation generation experimental technique and various theoretical calculation method and asked for the problem that biogas factor of created gase exists, more objective, to obtain more easily organic biogas factor of created gase, has extraordinary application prospect.
Brief description of the drawings
Fig. 1 is the process flow diagram of definite organic matrix of providing of the embodiment of the present invention at biochemical gas-genous stage factor of created gase;
Fig. 2 is the raw hydrocarbon mode chart that the embodiment of the present invention is set up according to hydrocarbon source rock characterization parameter;
Fig. 3 is " the A "/TOC with the longitudinal scale of hydrocarbon source rock buried depth and the buried depth graph of relation that the embodiment of the present invention is set up according to hydrocarbon source rock characterization parameter;
Fig. 4 is " the A "/TOC with the longitudinal scale of vitrinite reflectance Ro and the hot evolution level graph of relation of hydrocarbon source rock that the embodiment of the present invention is set up according to hydrocarbon source rock characterization parameter;
Fig. 5 is always raw hydrocarbon rate and the hydrocarbon source rock residual hydrocarbon rate comparison diagram of hydrocarbon source rock that the embodiment of the present invention utilizes the longitudinal scale of source rock buried depth to go out;
Fig. 6 is always raw hydrocarbon rate and the hydrocarbon source rock residual hydrocarbon rate comparison diagram of hydrocarbon source rock that the embodiment of the present invention utilizes the longitudinal scale of vitrinite reflectance to go out;
Fig. 7 is that the embodiment of the present invention always gives birth to according to hydrocarbon source rock row's hydrocarbon rate figure that hydrocarbon rate and hydrocarbon source rock residual hydrocarbon amount difference are obtained;
The factor of created gase figure of biogas under Fig. 8 each condition that to be the embodiment of the present invention calculate according to row's hydrocarbon rate.
Embodiment
For deep understanding the present invention, below in conjunction with accompanying drawing and specific embodiment, the present invention will be described in detail.
As Fig. 1, the invention provides a kind of method of organic matrix at biochemical gas-genous stage factor of created gase of determining, concrete flow process comprises five steps; The theoretical template figure of the method is proposed simultaneously, as Fig. 2; The method is implemented angle from technology, the shortcoming such as the factor of created gase value confidence level that draws for existing biogas factor of created gase acquiring method is not high, the raw hydrocarbon amount of application source rock equals to discharge the biogas factor of created gase that the material balance principle of hydrocarbon amount and residual hydrocarbons amount sum is more objective, more convenient, seek out more accurately source rock, has applicability very widely.The concrete steps of the method are:
Step 101: by chloroform bitumen " A " and family's component analysis experiment and vitrinite reflectance analysis experiment, obtain the hydrocarbon source rock characterization parameter of different evolution level of a certain region multiple places biological chemistry stage;
What the present embodiment was selected is the western part of China Caidamu Basin, obtain by experiment the characterization parameter of the source rock of different location, different buried depth, different evolution level in this basin, comprise that the buried depth h value of source rock, the evolution level Ro value of source rock, the abundance of organic matter TOC value of source rock are residual hydrocarbon chloroform bitumen " A " value, and these data are carried out to sorting-out in statistics, determine " A "/TOC value of source rock under buried depth h value, evolution level Ro value corresponding conditions.The part instance data of choosing for the Caidamu Basin as table 1;
Table 1
| Numbering | Buried depth h(m) | TOC（%） | Chloroform bitumen " A " | R 0（%） | “A”/TOC |
| 1 | 668-692 | 0.06 | 0.0113 | 0.11 | 0.19 |
| 2 | 722-755 | 0.11 | 0.014 | 0.17 | 0.13 |
| 3 | 1004-1006 | 0.27 | 0.0111 | 0.23 | 0.04 |
| 4 | 1128-1170 | 0.28 | 0.0127 | 0.27 | 0.05 |
| 5 | 1272-1282 | 0.05 | 0.013 | 0.33 | 0.26 |
| 6 | 1588-1598 | 0.07 | 0.0128 | 0.41 | 0.18 |
| 7 | 1900-1912 | 0.09 | 0.0146 | 0.47 | 0.16 |
Step 102: make " A "/TOC and the hot evolution level of source rock (or buried depth) graph of relation according to source rock characterization parameter;
This curve map is taking source rock vitrinite reflectance Ro or buried depth h as ordinate, taking " A "/TOC as horizontal ordinate;
If Fig. 3 is " A "/TOC and the buried depth graph of relation that the embodiment of the present invention is set up according to each characterization parameter of the source rock of different location, the Caidamu Basin, horizontal ordinate is with 0.1 interval scale, ordinate is with 1000m interval scale, concrete operation is thrown into corresponding each buried depth point " A "/TOC value in coordinate system, the unit organic carbon residual hydrocarbon amount of source rock reality, i.e. actual residual hydrocarbons rate are made envelope and are represented in distribution according to data point in coordinate system; Fig. 4 is " A "/TOC and the source rock evolution level graph of relation that the embodiment of the present invention is set up according to source rock characterization parameter, method is in like manner made corresponding envelope, the raw hydrocarbon amount of buried depth section source rock on envelope flex point equals residual hydrocarbons amount, and under flex point buried depth, source rock has raw hydrocarbon amount to equal to arrange hydrocarbon amount and residual hydrocarbon amount sum;
Step 103: at " A "/TOC and the hot evolution level graph of relation of source rock, find a large amount of thresholdings of discharging of biogas of biological gas generating phase, i.e. exhaust thresholding, obtains " A " at thresholding place
0/ TOC
0value;
According to " the A "/TOC having done in step 102 and the hot evolution level graph of relation of source rock, on packet winding thread, find out flex point, described threshold point, reads the value " A that this point is corresponding
0"/TOC
0.
For the first curve map longitudinally measured with buried depth in embodiment, as Fig. 5, the row's hydrocarbon thresholding place correspondence (0.71,203) on envelope; For the second curve map of longitudinally measuring with the hot evolution level Ro of heat in embodiment, Fig. 6 arranges hydrocarbon thresholding place correspondence (0.71,0.21);
Step 104: according to " A " at thresholding place
0/ TOC
0" A "/TOC value of value and different buried depth source rock reality, calculates the raw hydrocarbon amount of source rock index of recovery, and according to index of recovery and " A "
0/ TOC
0calculate the total raw hydrocarbon amount of different buried depth or different hot evolution level source rock biochemical gas-genous stages;
(1) calculating of the raw hydrocarbon amount of source rock index of recovery:
If table 2 is Qaidam degradation rate numerical value;
Table 2
Although there is above degradation rate numerical range in the embodiment Caidamu Basin, owing to there is no definite D
0, D
tvalue, so according to invalid carbon conservation formula C in source rock evolutionary process
0(1-D
0)=C
t(1-D
t) to giving birth to asking for and can impacting of hydrocarbon amount index of recovery, so embodiment does with formula the hydrocarbon amount index of recovery of seeking survival of deriving;
The computing formula of the raw hydrocarbon rate of source rock index of recovery μ is:
Wherein " A "
0the residual hydrocarbon rate of the following hydrocarbon source rock of/TOC-exhaust thresholding, i.e. the residual hydrocarbon amount of unit mass organic carbon reality, mg/g; " A "
0/ TOC
0the critical raw hydrocarbon rate of-exhaust thresholding place hydrocarbon source rock, i.e. the hydrocarbon amount of the critical generation of unit mass organic carbon, mg/g; The index of recovery of μ-hydrocarbon primary rock producing hydrocarbon rate, dimensionless; TOC is organic carbon content, %; " A " is the residual hydrocarbon amount chloroform bitumen of hydrocarbon source rock, mg/g;
(2) ask for hydrocarbon source rock always the formula of raw hydrocarbon rate be:
Wherein μ-index of recovery, dimensionless; q
p-hydrocarbon source rock is raw hydrocarbon rate always, i.e. the total hydrocarbon amount generating of unit mass organic carbon, mg/g; HCI
pthe critical raw hydrocarbon rate of-exhaust thresholding place hydrocarbon source rock, i.e. the hydrocarbon amount of the critical generation of unit mass organic carbon, mg/g.
According to the experimental formula of above-mentioned raw hydrocarbon amount index of recovery, " A " of embodiment
0/ TOC
0be that 0.71, Fig. 5,6 is in embodiment, the total raw hydrocarbon rate of the row's of entering hydrocarbon thresholding source rock biochemical gas-genous stage that the raw hydrocarbon amount of application source rock index of recovery experimental formula calculates, and on figure, draw the raw hydrocarbon potentiality of the source rock curve after recovery; Part between two curves, equals to arrange hydrocarbon amount and residual quantity and principle according to the raw hydrocarbon amount of source rock of method, and what just represent is the organic row of the unit hydrocarbon value of source rock, arranges hydrocarbon rate.
Step 105: on the basis of step 104, utilize total raw hydrocarbon amount and residual hydrocarbon amount to calculate the factor of created gase of source rock biogas;
The calculating of factor of created gase is that to discharge hydrocarbon amount be basis, is to show with the raw biogas scale of discharging of organic matter at biochemical gas-genous stage, arranges hydrocarbon rate;
(1) the organic calculating of discharging hydrocarbon amount of unit mass, deducts source rock residual hydrocarbon amount now with the total raw hydrocarbon value of the row's of entering hydrocarbon thresholding source rock, and concrete formula is:
Wherein q
e-hydrocarbon source rock row hydrocarbon rate, the hydrocarbon amount that unit mass organic carbon is discharged, mg/g; q
0the residual hydrocarbon rate of the following hydrocarbon source rock of-exhaust thresholding, i.e. the residual hydrocarbon amount of unit mass organic carbon reality, mg/g; μ-index of recovery; Effect as shown in Figure 7.
(2) calculating of factor of created gase, concrete is exactly to utilize unit conversion to ask for, should be and discharging hydrocarbon amount at biological chemistry stage source rock is all taking methane gas as main biogas substantially, thus for taking methane gas for main biogas.
Because organic matrix in biochemical gas-genous stage hydrocarbon source rock, the hydro carbons generating is gas substantially, this is biogas for the alkyl that hydrocarbon source rock is discharged, be easy to diffusion and discharge, residual little in hydrocarbon source rock, moreover, the hydrocarbon source rock residual hydrocarbon amount chloroform bitumen " A " of choosing is liquid residual hydrocarbon, containing gas, so the factor of created gase of organic matrix equals row's hydrocarbon rate of hydrocarbon source rock, i.e. row's hydrocarbon amount of unit mass organic carbon in biochemical gas-genous stage hydrocarbon source rock.
According to unit conversion formula 1mg/g=1.43m
3/ tc obtain biogas under normal temperature-pressure condition factor of created gase k ask for formula and be:
K=q
e1.43m
3/ tc; Factor of created gase under K-normal temperature-pressure condition, m
3/ t
c, t
c-organic carbon per ton
The applicable elements of this reduction formula is: (1) this factor of created gase is under standard state, to obtain factor of created gase, so the reduction formula under underground concrete Temperature-pressure Conditions will be determined with corresponding actual conditions; (2) in the process converting, should have the processing of methane biogas the discharge alkyl of hydrocarbon source rock.Fig. 8 is the factor of created gase of biogas under each condition that the embodiment of the present invention calculates according to row's hydrocarbon amount, reflect that biogas factor of created gase is relevant to buried depth or the hot evolution level of source rock, the biogas factor of created gase that the method is obtained with additive method exists difference, as shown in Figure 8, the evaluation development result demonstration of later stage Qinghai Oil Field, the factor of created gase of obtaining according to the method is more accurate with respect to the result of additive method.
In actual applications, utilize the definite biogas factor of created gase value of the method that proposes in the embodiment of the present invention very accurate, be embodied in the biogas stock number of utilizing this factor of created gase to assess out and the stock number of carrying out resource evaluation gained by other several different methods and have difference, and more approach actual oil field stock assessment amount, the development effectiveness in later stage oil field also verifies, the biogas factor of created gase of asking for by this method is accurately the most objective with respect to additive method.
The present invention only utilizes several a small amount of hydrocarbon source rock characterization parameters of total content of organic carbon TOC, residual hydrocarbon amount chloroform bitumen " A ", vitrinite reflectance Ro value and hydrocarbon source rock buried depth h of hydrocarbon source rock, just the biogas factor of created gase in organic biological chemistry stage accurately can be obtained, there is its original innovation: (1) is with respect to the more biogas analogue experiment method of asking for biogas factor of created gase and using in the past, the method is based on the analytical approach of pure theory value, the factor of created gase value result of determining is very objective, and precision is high; (2) with respect to other several theoretical calculation methods, the theoretical principle of the method is actual, and the data simultaneously relying on is easily obtained, and is mainly the collection of total content of organic carbon TOC, residual hydrocarbon amount chloroform bitumen " A ", avoid as pyrolysis parameters of rock S
1, S
2the drawback that is difficult to obtain; (3) what the method was determined is the factor of created gase of biological gas generating phase biogas, has broken away from the theoretical limitation of only asking for oil generation gas stage oil gas conversion ratio of calculating in the past; (4) step of the method understands, flow process is simple, and quick and easy for asking for of factor of created gase, work efficiency is high; .
Embodiments of the invention have solved and have been widely used at present asking for to such an extent that the biogas simulation of organic biological chemistry stage biogas factor of created gase generates the existing problem of experimental method, more objective, faster, the more believable biogas factor of created gase of determining is obtained good effect in the biogas resource evaluation of oil field.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect have been carried out to further detailed description; so what understand is; the foregoing is only the concrete embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. determine the method for organic matrix at biochemical gas-genous stage factor of created gase, it is characterized in that, described method comprises:
(1), by chloroform bitumen " A " and family's component analysis experiment and vitrinite reflectance analysis experiment, obtain residual hydrocarbon amount chloroform bitumen " A " value of multiple places, a certain region in biochemical gas-genous stage hydrocarbon source rock, vitrinite reflectance Ro value, organic carbon content TOC and tetra-characterization parameters of buried depth h of reflection Thermal Evolution of Source Rocks degree;
(2) draw " A "/TOC and hydrocarbon source rock vitrinite reflectance Ro or buried depth h graph of relation according to hydrocarbon source rock characterization parameter;
(3) according to " A "/TOC and Ro or h graph of relation, determine a large amount of exhaust thresholdings of discharging of biochemical gas-genous stage biogas, the value that this thresholding is corresponding is " A
0"/TOC
0;
(4) according to " A " of exhaust thresholding
0/ TOC
0be worth the index of recovery μ that determines hydrocarbon primary rock producing hydrocarbon rate from " A "/TOC value of hydrocarbon source rock reality under different Ro or h condition, and according to index of recovery μ and " A "
0/ TOC
0determine the total raw hydrocarbon rate of hydrocarbon source rock biochemical gas-genous stage under different Ro or h condition;
(5) the total raw hydrocarbon rate of foundation and residual hydrocarbon rate difference are determined the factor of created gase of organic matrix in hydrocarbon source rock, the hydrocarbon amount that unit mass organic carbon is discharged.
2. method according to claim 1, is characterized in that, in (1), multiple places should be uniformly distributed study area.
3. method according to claim 1, is characterized in that, described in (2), according to hydrocarbon source rock characterization parameter, the concrete steps of drawing " A "/TOC and hydrocarbon source rock vitrinite reflectance Ro or buried depth h graph of relation are:
Utilize residual hydrocarbon amount chloroform bitumen " A " and content of organic carbon of hydrocarbon source rock TOC to determine residual hydrocarbon rate " A "/TOC, i.e. unit mass organic carbon residual hydrocarbon amount;
Taking Ro or h as ordinate, draw " A "/TOC and Ro or h graph of relation taking each Ro or " A "/TOC corresponding to h as horizontal ordinate.
4. method according to claim 1, is characterized in that, exhaust thresholding described in (3) refers to the point of horizontal ordinate maximum on " A "/TOC and Ro or h graph of relation, and the value of this point is " A
0"/TOC
0, on this thresholding, " A "/TOC increases with the increase of Ro or h, and under this thresholding, " A "/TOC is with the reducing and reduce of Ro or h, and exhaust thresholding is point of inflexion on a curve.
5. method according to claim 1, is characterized in that, the definite formula of the index of recovery μ of hydrocarbon primary rock producing hydrocarbon rate described in (4) is:
The wherein residual hydrocarbon rate of the following hydrocarbon source rock of " A "/TOC-exhaust thresholding, i.e. the residual hydrocarbon amount of unit mass organic carbon reality, mg/g; " A "
0/ TOC
0the critical raw hydrocarbon rate of-exhaust thresholding place hydrocarbon source rock, i.e. the hydrocarbon amount of the critical generation of unit mass organic carbon, mg/g; The index of recovery of μ-hydrocarbon primary rock producing hydrocarbon rate, dimensionless; TOC is organic carbon content, %; " A " is the residual hydrocarbon amount chloroform bitumen of hydrocarbon source rock, mg/g.
6. method according to claim 1, is characterized in that, in (4), ask for hydrocarbon source rock always raw hydrocarbon rate ask for formula and be:
Wherein μ-index of recovery, dimensionless; q
p-hydrocarbon source rock is raw hydrocarbon rate always, i.e. the total hydrocarbon amount generating of unit mass organic carbon, mg/g; HCI
pthe critical raw hydrocarbon rate of-exhaust thresholding place hydrocarbon source rock, i.e. the hydrocarbon amount of the critical generation of unit mass organic carbon, mg/g.
7. method according to claim 1, it is characterized in that, (5) in the biochemical gas-genous stage hydrocarbon source rock of asking in, the factor of created gase of organic matrix equals row's hydrocarbon rate of hydrocarbon source rock, be row's hydrocarbon amount of unit mass organic carbon, this is biogas for the alkyl that hydrocarbon source rock is discharged, and is easy to diffusion and discharges, moreover, the hydrocarbon source rock residual hydrocarbon amount chloroform bitumen " A " of choosing is liquid residual hydrocarbon, and or not containing gas, the formula that factor of created gase is asked for is not:
(1) determine factor of created gase, concrete formula is:
Wherein K-factor of created gase, mg/g; q
e-hydrocarbon source rock row hydrocarbon rate, the hydrocarbon amount that unit mass organic carbon is discharged, mg/g; q
0the residual hydrocarbon rate of the following hydrocarbon source rock of-exhaust thresholding, i.e. the residual hydrocarbon amount of unit mass organic carbon reality, mg/g; μ-index of recovery;
(2) again according to unit conversion formula 1mg/g=1.43m
3/ t
cthe biological gas factor of created gase of hydrocarbon source rock K under Temperature-pressure Conditions settles the standard
1for:
K
1=q
e·1.43m
3/t
c；
Wherein K
1factor of created gase under-normal temperature-pressure condition, m
3/ t
c, t
c-organic carbon per ton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210511237.7A CN103852569B (en) | 2012-12-03 | 2012-12-03 | A kind ofly determine the method for organic matrix at biochemical gas-genous stage factor of created gase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210511237.7A CN103852569B (en) | 2012-12-03 | 2012-12-03 | A kind ofly determine the method for organic matrix at biochemical gas-genous stage factor of created gase |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103852569A true CN103852569A (en) | 2014-06-11 |
| CN103852569B CN103852569B (en) | 2015-11-25 |
Family
ID=50860477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210511237.7A Active CN103852569B (en) | 2012-12-03 | 2012-12-03 | A kind ofly determine the method for organic matrix at biochemical gas-genous stage factor of created gase |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103852569B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166796A (en) * | 2014-08-13 | 2014-11-26 | 中国石油大学(北京) | Method and device for determining scale of maximum single oil and gas reservoir in accumulation system |
| CN105628543A (en) * | 2015-12-22 | 2016-06-01 | 中国石油大学(北京) | Method for determining quantity of generated hydrocarbon of organic parent material |
| CN106153666A (en) * | 2015-03-27 | 2016-11-23 | 中国石油化工股份有限公司 | The analogy method of hydrocarbon source rock repeatedly hydrocarbon feature under the conditions of different buried history |
| CN106326516A (en) * | 2015-07-02 | 2017-01-11 | 中国石油天然气股份有限公司 | Establishment method for hydrocarbon expulsion function and hydrocarbon expulsion index function of hydrocarbon source rocks |
| CN107727832A (en) * | 2017-10-27 | 2018-02-23 | 中国石油天然气股份有限公司 | A kind of method and device for determining hydrocarbon source rock expulsive efficiency |
| CN108052789A (en) * | 2017-11-28 | 2018-05-18 | 中国石油大学(北京) | The method and apparatus of the fine and close oily production zone of prediction |
| CN109577933A (en) * | 2018-10-24 | 2019-04-05 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of microorganism volume increase coal bed gas well location selection method |
| CN111024627A (en) * | 2019-12-25 | 2020-04-17 | 广东电网有限责任公司 | Rapid discrimination method for maturity of hydrocarbon source rock |
| CN111077586A (en) * | 2018-10-18 | 2020-04-28 | 中国石油化工股份有限公司 | Method and device for determining main oil and gas accumulation period of complex fault basin |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100516837C (en) * | 2006-10-10 | 2009-07-22 | 中国海洋大学 | Apparatus and method for measuring organic maturity degree of hydrocarbon source rocks |
| CN201293779Y (en) * | 2008-11-27 | 2009-08-19 | 中国科学院广州地球化学研究所 | Open type dynamics research device for natural gas generation |
-
2012
- 2012-12-03 CN CN201210511237.7A patent/CN103852569B/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166796A (en) * | 2014-08-13 | 2014-11-26 | 中国石油大学(北京) | Method and device for determining scale of maximum single oil and gas reservoir in accumulation system |
| CN106153666A (en) * | 2015-03-27 | 2016-11-23 | 中国石油化工股份有限公司 | The analogy method of hydrocarbon source rock repeatedly hydrocarbon feature under the conditions of different buried history |
| CN106326516A (en) * | 2015-07-02 | 2017-01-11 | 中国石油天然气股份有限公司 | Establishment method for hydrocarbon expulsion function and hydrocarbon expulsion index function of hydrocarbon source rocks |
| CN105628543A (en) * | 2015-12-22 | 2016-06-01 | 中国石油大学(北京) | Method for determining quantity of generated hydrocarbon of organic parent material |
| CN107727832A (en) * | 2017-10-27 | 2018-02-23 | 中国石油天然气股份有限公司 | A kind of method and device for determining hydrocarbon source rock expulsive efficiency |
| CN108052789A (en) * | 2017-11-28 | 2018-05-18 | 中国石油大学(北京) | The method and apparatus of the fine and close oily production zone of prediction |
| CN111077586A (en) * | 2018-10-18 | 2020-04-28 | 中国石油化工股份有限公司 | Method and device for determining main oil and gas accumulation period of complex fault basin |
| CN111077586B (en) * | 2018-10-18 | 2023-08-01 | 中国石油化工股份有限公司 | Method and device for determining main reservoir period of oil gas in complex fractured basin |
| CN109577933A (en) * | 2018-10-24 | 2019-04-05 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of microorganism volume increase coal bed gas well location selection method |
| CN111024627A (en) * | 2019-12-25 | 2020-04-17 | 广东电网有限责任公司 | Rapid discrimination method for maturity of hydrocarbon source rock |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103852569B (en) | 2015-11-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103852569B (en) | A kind ofly determine the method for organic matrix at biochemical gas-genous stage factor of created gase | |
| CN104700316B (en) | A kind of nonuniformity evaluates the method for mud shale oil generation tolerance | |
| Zhao et al. | Numerical simulation of gas production from hydrate deposits using a single vertical well by depressurization in the Qilian Mountain permafrost, Qinghai-Tibet Plateau, China | |
| Huang et al. | Astronomical forcing of Middle Permian terrestrial climate recorded in a large paleolake in northwestern China | |
| CN106285581A (en) | A kind of method utilizing origin bacterium to improve methane output | |
| Zhou et al. | Overview of 30 years of research on solubility trapping in Chinese karst | |
| CN105353101A (en) | Natural gas reservoir formation process quantitative recovery method | |
| Huang et al. | Quantitative modelling of hydrocarbon expulsion and quality grading of tight oil lacustrine source rocks: Case study of Qingshankou 1 member, central depression, Southern Songliao Basin, China | |
| Zhang et al. | Kinetic simulation of hydrocarbon generation and its application to in-situ conversion of shale oil | |
| CN105138749A (en) | Method for recovering original organic carbon of highly-mature hydrocarbon source rocks under geological constraint | |
| Yu et al. | Reconstructing prehistoric land use change from archeological data: Validation and application of a new model in Yiluo valley, northern China | |
| Fietz et al. | Archaeal membrane lipid-based paleothermometry for applications in polar oceans | |
| Bao et al. | Geochemical characteristics and generation process of mixed biogenic and thermogenic coalbed methane in Luling coalfield, China | |
| Wang et al. | Indication of origin and distribution of coalbed gas from stable isotopes of gas and coproduced water in Fukang area of Junggar Basin, China | |
| Albéric et al. | Carbon cycling and organic radiocarbon reservoir effect in a meromictic crater lake (Lac Pavin, Puy-de-Dôme, France) | |
| CN110017129A (en) | A kind of karst GEOTHERMAL WATER Scaling Tendency Prediction method considering sour gas degassing | |
| US10544442B2 (en) | Methods for the determination of biogenic gas | |
| CN109188557A (en) | A method of expulsive efficiency is calculated using hydrocarbon boost pressure model | |
| CN115964842A (en) | Method and system for determining natural gas hydrate resource amount | |
| CN114841007A (en) | Carbon emission diffusion influence analysis method based on urban regional scale | |
| CN113944459B (en) | Method and device for predicting resource amount of shale in-situ conversion recoverable oil gas | |
| CN111101930B (en) | Single-well exploitation production-increasing potential evaluation method in gas reservoir development mode | |
| Kemna et al. | Workflows and interpretation of regional 3-D petroleum systems modeling: An example from the deep-water pre-salt realm of the Santos Basin, Brazil | |
| CN105825055A (en) | Method for computing relative content of CO2 in formation by using well-log information | |
| Lu et al. | Geochemical characteristics of coal measure source rocks of Upper Carboniferous Benxi Formation in Daning-Jixian area, eastern margin of Ordos Basin |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |