CN102071929A - Method for generating dolomite reservoir geochemical plate - Google Patents
Method for generating dolomite reservoir geochemical plate Download PDFInfo
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- CN102071929A CN102071929A CN2010105816075A CN201010581607A CN102071929A CN 102071929 A CN102071929 A CN 102071929A CN 2010105816075 A CN2010105816075 A CN 2010105816075A CN 201010581607 A CN201010581607 A CN 201010581607A CN 102071929 A CN102071929 A CN 102071929A
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Abstract
The invention provides a method for generating a dolomite reservoir geochemical plate. The method comprises the following steps: selecting a dolomite sample according to a core structure, and preparing the selected dolomite sample into sample pieces; carrying out electronic probe microanalysis, laser carbon oxygen isotope analysis, strontium isotope analysis and rare earth element analysis on the sample pieces to generate analysis data; determining the genetic type of the dolomite reservoir according to the sample pieces; and generating a geochemical plate according to the analysis data and the genetic type. By utilizing the dolomite reservoir geochemical plate in the invention, the genetic type of the dolomite reservoir can be accurately and rapidly identified; compared with the traditional method, the genesis of the reservoir is more accurate and reliable, and the reservoir formation mechanism and master control factors can be known deeply.
Description
Technical field
The invention relates to the reservoir geology investigative technique in the petroleum geology exploration, particularly about dolomite reservoir study technology, is about a kind of dolomite RESERVOIR GEOCHEMISTRY plate generation method concretely.
Background technology
Dolomite is very important oil and gas reservoir, and in the carbonate reservoir of North America, dolomite reservoir proportion surpasses 80%, and ratio has also surpassed 50% (Zenger et al., 1980) in the global range.In recent years, the exploration of Chinese marine facies carbonate rock was particularly found a plurality of larger hydrocarbons field successively also in continuous breakthrough in the dolomite reservoir, disclosed the dolomite reservoir and had great potential.The dolomite proportion is very big in the carbonate rock, grows from Sinian system to the Lower Ordovician Series that dolomite is thick to reach 2000 meters, but because the dolomite exploration is started late, and data accumulation is not enough, it is not enough to depend merely on petrology method understanding dolomite reservoir type reliability.
The dolomite reservoir is carried out the geochemical reservoir origin types identification of microcell multi-parameter on the petrology basis, be significant for prediction different origins type dolomite reservoir spread rule and further exploration and development, still do not have ripe dolomite reservoir origin types recognition technology both at home and abroad at present.Traditional dolomite reservoir type is divided the description of mainly being devoted to feature, dolomite is divided into crystallite, powder crystal, thin brilliant, coarse-grain etc., being aided with a certain or several geochemistry experiment analyses comes the dolomite reservoir type and the origin cause of formation are analyzed, the advantage of this method is the objective description of having carried out reservoir characteristic, but the sampling of geochemical analysis is carried out on the rock core yardstick, sample may include multiple group of structure, and the origin cause of formation of every kind of group structure may be different, can't guarantee that every experimental analysis is the Conjoint Analysis of carrying out at same group of structure, be unfavorable for clearly being familiar with dolomite reservoir origin cause of formation mechanism like this, the formation environment that discloses is bright and clear inadequately, and therefore the origin cause of formation and the growth regularity of distribution announcement power for the dolomite reservoir is not enough.
Summary of the invention
The invention provides a kind of dolomite RESERVOIR GEOCHEMISTRY plate generation method,, and can carry out faster dolomite reservoir origin types identification accurately by the geochemistry plate with profound level understanding dolomite reservoir origin cause of formation mechanism.
The invention provides a kind of dolomite RESERVOIR GEOCHEMISTRY plate generation method, this comprises: choose the dolomite sample according to the rock core structure, and the dolomite sample preparation of choosing is become the multi-disc sample; The multi-disc sample is carried out electron probing analysis, laser carbon oxygen isotope analysis, strontium isotope analysis and rare earth elemental analysis, generate and analyze data; Determine the genetic type of described dolomite reservoir according to the multi-disc sample; According to analysis data and genetic type generate the geochemistry plate.
Useful technique effect of the present invention: utilize dolomite RESERVOIR GEOCHEMISTRY plate of the present invention, can discern the dolomite reservoir origin types quickly and accurately, compare with conventional method, the reservoir origin cause of formation is explained more accurately and reliably, more can form mechanism and Dominated Factors from be familiar with reservoir profoundly; Under the situation that drilling hole number is not enough, be aided with background informations such as deposition and structure in the plane, can distribute to the dolomite reservoir development of different origins type and portray.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is that embodiment of the invention dolomite RESERVOIR GEOCHEMISTRY plate generates method flow diagram;
Fig. 2 is embodiment of the invention dolomite RESERVOIR GEOCHEMISTRY plate product process figure;
Fig. 3 A is different dolomite reservoir origin types MgO of the embodiment of the invention and CaO graph of a relation;
Fig. 3 B be the embodiment of the invention different dolomite reservoir origin types Mg/Ca and
87Sr/
86The Sr graph of a relation;
Fig. 3 C is the different dolomite reservoir origin types of embodiment of the invention δ
13C and δ
18The O graph of a relation;
Fig. 3 D is the different dolomite reservoir origin types of an embodiment of the invention partition of rare earth element ideograph.
The specific embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, the embodiment of the invention is described in further details below in conjunction with accompanying drawing.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
The object of the invention is profound understanding Tarim Basin dolomite reservoir origin cause of formation mechanism, and can carry out faster dolomite reservoir origin types identification accurately by the geochemistry plate, can carry out the analysis of the different origins type dolomite reservoir development regularity of distribution in conjunction with sedimentation setting and diagenesis evolution, instruct further dolomite exploration direction.
As shown in Figure 1, the dolomite RESERVOIR GEOCHEMISTRY plate generation method of present embodiment comprises: choose the dolomite sample according to the rock core structure, and the dolomite sample preparation of choosing is become multi-disc sample S101.Described multi-disc sample is carried out electron probing analysis, laser carbon oxygen isotope analysis, strontium isotope analysis and rare earth elemental analysis, generate and analyze data S102.Determine the genetic type S103 of described dolomite reservoir according to described multi-disc sample.Generate geochemistry plate S104 according to described analysis data and genetic type.
Among the step S102, the multi-disc sample is carried out electron probing analysis, laser carbon oxygen isotope analysis, strontium isotope analysis and rare earth elemental analysis, generate and analyze data, specifically comprise: picked at random first sample, second sample, the 3rd sample and the 4th sample from described multi-disc sample, described first sample is carried out electron probing analysis, described second sample is carried out laser carbon oxygen isotope analysis, described the 3rd sample is carried out the strontium isotope analysis, described the 4th sample is carried out rare earth elemental analysis, generate respectively and analyze data.The analysis data of described first sample being carried out the electron probing analysis generation are relative amount and the Mg/Ca value of CaO and MgO; The analysis data of described second sample being carried out the generation of laser carbon oxygen isotope analysis are δ
13C value and δ
18The O value, the analysis data of described the 3rd sample being carried out strontium isotope analysis generation are
87Sr/
86The Sr value, the analysis data of described the 3rd sample being carried out the rare earth elemental analysis generation are the content of rare earth element,
Among the step S103, determine to comprise the genetic type of dolomite reservoir: the genetic type of determining described dolomite reservoir according to sedimentation setting, weather conditions and the diagenesis evolution of described dolomite reservoir according to described multi-disc sample.
Among the step S104, generate the geochemistry plate, comprising: be selected to described analysis data because of last association according to described genetic type according to described analysis data and genetic type; Generate the geochemistry plate according to selected described analysis data and described genetic type.
In addition, except among the step S102 multi-disc sample being carried out electron probing analysis, laser carbon oxygen isotope analysis, strontium isotope analysis and rare earth elemental analysis, also comprise picked at random the 5th sample from described multi-disc sample, described the 5th sample is carried out the cathodoluminescence analysis reach picked at random the 6th sample from described multi-disc sample, described the 6th sample is carried out the casting body flake analysis.
Describe the step of present embodiment dolomite RESERVOIR GEOCHEMISTRY plate generation method in detail below in conjunction with Fig. 2.In Fig. 2, the solid line direction of band arrow is the method step of experiment sample, and the dotted line direction of band arrow is the method step of check sample.The present invention utilizes the experiment sample to generate dolomite RESERVOIR GEOCHEMISTRY plate, utilize the check sample to chemissues map generalization test.
As shown in Figure 2, the detailed step of present embodiment is as follows:
Step 1, carry out core observation, typical phenomenon is taken a sample.
Core observation mainly comprises the description to aspects such as rock type, sedimentary structure, diagenetic phenomenon and reservoir characteristics, determines that tentatively back the giving birth to of lithotope and experience transformed; The sample of sampling need be contained as much as possible diagenetic phenomenon to disclose information as much as possible, and the size of sampling sample preferably is not less than 3 * 3 * 7cm.
The analysis of microcell multi-parameter geochemistry experiment is carried out in step 2, indoor sample preparation.
The sample of sample preparation comprises experiment sample and check sample.When carrying out indoor sample preparation, the sample of experiment sample and check sample need be cut into respectively and be no less than 5, in order to grinding thin slice, cut direction need guarantee all to contain in each thin slice similar emphasis phenomenon, in order to comparative analysis, and preferably keeps residual sample.
When carrying out the microcell multi-parameter geochemistry experiment analysis of step 2, grind two cover thin slice (interplanting cathodoluminescences earlier, the one interplanting body of casting (blueness), cathodoluminescence is observed from the origin cause of formation and is respectively organized the structure feature, further choose selective analysis group structure, half dyes the blue body of casting with alizarin red, distinguishes dolomite and calcite, is familiar with the reservoir pore space feature simultaneously); Grind other two cover thin slices then, the selective analysis group structure of choosing is carried out the microscopically microcell delineation of laser carbon oxygen isotope and electron probing analysis; At last the analytic sample of strontium isotope and rare earth element is organized structure and select, need guarantee analysis bank structure unanimity as far as possible.Send the laboratory experiment Analysis to get group structure then, get final product by the current experiments analytical method.
After step 2 finishes, can set up a packet to each sample, comprise: one in rock sample photo, cathodoluminescence photo one cover, body of casting photo one overlap, laser carbon oxygen isotope gets photo ready and data, electron probe are got photo and data, strontium isotope sample photo and data, rare earth element sample photo and data etc. ready.
Step 3, based on step 1 core observation result, the observation of the thin slice that integrating step 2 grinds, the dolomite reservoir origin types is determined in aspects such as comprehensive sedimentation setting (geologic setting among Fig. 2), weather conditions and diagenesis evolution.
Described sedimentation setting of step 3 and weather conditions are mainly considered the dolomite grain size, whether are contained anhydrite or gypsum, the occurrence of gypsum, and gypsum and dolomite proportion in the stratum, and the developmental state of cream nib etc.The diagenesis evolution feature mainly comprises the identification of dolomite grain size, recrystallization phenomenon and hydrothermal solution associated minerals, as: the dolomicrite that contains gypsum spot or patch can think tentatively that the dolomite of tidal flat environment, its reservoir origin types are decided to be evaporation tidal flat dolomite reservoir; And coarse-grain dolomite mostly is and buries the dolomite reservoir.
The experimental result Conjoint Analysis of association on step 4, the origin cause of formation generates plate; The plate that generates has shown the genetic type relation of Tarim Basin Cambrian system-Lower Ordovician Series four class dolomite reservoirs (evaporate tidal flat dolomite reservoir, evaporation tableland dolomite reservoir, bury dolomite reservoir and hydrothermal solution dolomite reservoir) among Fig. 3 A to Fig. 3 D shown in Fig. 3 A to Fig. 3 D.Fig. 3 A is different dolomite reservoir origin types MgO of the embodiment of the invention and CaO graph of a relation, Fig. 3 B be the embodiment of the invention different dolomite reservoir origin types Mg/Ca and
87Sr/
86Sr graph of a relation, Fig. 3 C are the different dolomite reservoir origin types of embodiment of the invention δ
13C and δ
18O graph of a relation, Fig. 3 D are the different dolomite reservoir origin types of embodiment of the invention partition of rare earth element ideograph.
Experimental result related on the described origin cause of formation of step 4 comprises: the relative amount of CaO and MgO in the electron probe, the δ of laser carbon oxygen isotope
13C and δ
18The O value, Mg/Ca with
87Sr/
86Sr and rare earth element.
In the described generation plate of step 4, CaO and MgO, δ
13C and δ
18The O value, and Mg/Ca with
87Sr/
86Sr is a rectangular coordinate system, and rare earth element needs to carry out standardization with the chondrite ree content earlier, and (measuring data/standard value, standard value adopt Leedy chondrite rare earth element: La:0.378, Ce:0.976, Pr:0.138, Nd:0.716, Sm:0.23, Eu:0.0866, Gd:0.311, Tb:0.0568, Dy:0.39, Ho:0.0868, Er:0.255, Tm:0.0399, Yb:0.219, Lu:0.0387 (mapping) with logarithmic coordinates.The experimental analysis data that keep the sample that accounts for total number of samples 1% at random do not enter compilation.
After step 4 is drawn plate, need the examination of validity as a result of exceptional value experiment Analysis, by the petrology analysis of sample photo and correspondence analysis result's matching, and the correspondence of such analysis result and these other analysis results of sample, as can't corresponding or coupling, then this sample should be rejected.As evaporate the depositional environment that tidal flat dolomite reservoir is formed at rapid crystallization, and based on dolomicrite, crystallization degree is low, (Mg/Ca) is low for the degree of order, and MgO-CaO is linear positive correlation (Fig. 3 A); Strontium isotope integral body is between 0.7085-0.7100, a little more than the seawater value same period (0.7090) (Fig. 3 B); δ
18O is-4 ‰--between 7 ‰ PDB, and the δ of oxidised form carbon
13The C value is-1 ‰-1 ‰ PDB, with respect to the δ of carbon in the seawater carbonate
13The feature (Fig. 3 C) that C (low on the occasion of) tool is born partially; The evaporation tidal flat is a feature with low-temperature alkali and oxidation environment, Ce
3+The molten Ce of phase commute will constantly be oxidized to
4+And by the migration dilution, Eu the Ce negative anomaly appears,
3+To be reduced to the molten Eu2+ of phase commute and, Eu negative anomaly (Fig. 3 D) occurs by the migration dilution, if experiment analysis results therewith rule differ greatly, need to consider its correctness.
Step 5, the dolomite reservoir origin types of step 3 and the geochemistry plate of step 4 are carried out aggregate analysis, inquire into theoretic reasonability, check the correctness and the generality of plate, draw a circle to approve the scope on the different dolomite reservoir origin types geochemistry plates, so that as the recognition template of dolomite reservoir origin types.
The described theoretic reasonability of step 5 is meant whether the geochemical indicators under the dolomite reservoir formation environment is consistent with information revealed in the plate.As the consistent recognition template that can be used as, reanalyse the accuracy of step 3) as inconsistent need.Fig. 3 A to Fig. 3 D is the geochemistry plate of dissimilar dolomite reservoirs, and wherein evaporating tableland dolomite reservoir is the product that diagenetic environment is hidden in shallow embedding, and (Mg/Ca) is medium for the dolomite crystallization degree and the degree of order, and MgO-CaO is linear negative correlation (Fig. 3 A); Strontium isotope integral body is between 0.7085-0.7100, and is relevant with the evaporation seawater a little more than seawater value 0.7090 same period, but with sabkha dolomitic facies ratio, the higher Mg/Ca of tool is than (Fig. 3 B); Under the violent evaporation condition, will be tending towards higher δ
18O value (0 ‰-4 ‰ PDB); The δ of oxidised form carbon
13The C value is-6 ‰-0 ‰ PDB, with respect to the δ of carbon in the seawater carbonate
13The feature (Fig. 3 C) that C (low on the occasion of) tool is born partially; The evaporation tableland is a feature with low-temperature alkali and oxidation environment, Ce
3+The molten Ce of phase commute will constantly be oxidized to
4+And by the migration dilution, Eu the Ce negative anomaly appears,
3+The molten Eu of phase commute will be reduced to
2+And by the migration dilution, the Eu negative anomaly appears.But shallow embedding Tibetan environment makes Eu with the rising of temperature
3+Easily be oxidized to the Eu of indissoluble
4+And the slow appearance of having filled the Eu negative anomaly of relative enrichment takes place, so Eu off-note not obvious (Fig. 3 D).The theory analysis of such dolomite reservoir formation background is consistent with experiment analysis results as can be known, can be used as the identification plate.
Step 6, plate verifying correctness.
Step 4 keeping sample is carried out genetic type divide (identical), the experiment analysis results cultellation in plate, is checked the correctness of plate with the method for step 3, inconsistent as the cultellation scope, need carry out step 3 and step 4 again.
Use the present invention, can't clearly distinguish under the situation of dolomite reservoir type on the petrology, can discern the dolomite reservoir origin types quickly and accurately, compare with conventional method, logic analysis is stronger, and the reservoir origin cause of formation is explained more accurately and reliably, more can form mechanism and Dominated Factors from be familiar with reservoir profoundly, under the situation that drilling hole number is not enough, be aided with background informations such as deposition and structure in the plane, can distribute to the dolomite reservoir development of different origins type and portray.By the present invention, under the control of limited drilling well, successfully portrayed the germinal layer position and the distribution of Tarim Basin Cambrian system-Lower Ordovician Series four class dolomite reservoirs (evaporate tidal flat dolomite reservoir, evaporation tableland dolomite reservoir, bury dolomite reservoir and hydrothermal solution dolomite reservoir), further dolomite exploration has been had great importance.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. dolomite RESERVOIR GEOCHEMISTRY plate generation method is characterized in that described method comprises:
Choose the dolomite sample according to the rock core structure, and the dolomite sample preparation of choosing is become the multi-disc sample;
Described multi-disc sample is carried out electron probing analysis, laser carbon oxygen isotope analysis, strontium isotope analysis and rare earth elemental analysis, generate and analyze data;
Determine the genetic type of described dolomite reservoir according to described multi-disc sample;
Generate the geochemistry plate according to described analysis data and genetic type.
2. the method for claim 1 is characterized in that, described multi-disc sample is carried out electron probing analysis, laser carbon oxygen isotope analysis, strontium isotope analysis and rare earth elemental analysis, generates to analyze data, comprising:
Picked at random first sample, second sample, the 3rd sample and the 4th sample from described multi-disc sample, described first sample is carried out electron probing analysis, described second sample is carried out laser carbon oxygen isotope analysis, described the 3rd sample is carried out the strontium isotope analysis, described the 4th sample is carried out rare earth elemental analysis, generate respectively and analyze data.
3. method as claimed in claim 2 is characterized in that, the analysis data of described first sample being carried out the electron probing analysis generation are relative amount and the Mg/Ca value of CaO and MgO.
4. method as claimed in claim 2 is characterized in that, the analysis data of described second sample being carried out the generation of laser carbon oxygen isotope analysis are δ
13C value and δ
18The O value.
5. method as claimed in claim 2 is characterized in that, the analysis data of described the 3rd sample being carried out strontium isotope analysis generation are
87Sr/
86The Sr value.
6. method as claimed in claim 2 is characterized in that, the analysis data of described the 4th sample being carried out the rare earth elemental analysis generation are the abundance of rare earth element.
7. method as claimed in claim 1 or 2, it is characterized in that, determine to comprise the genetic type of dolomite reservoir: the genetic type of determining described dolomite reservoir according to sedimentation setting, weather conditions and the diagenesis evolution of described dolomite reservoir according to described multi-disc sample.
8. method as claimed in claim 7 is characterized in that, generates the geochemistry plate according to described analysis data and genetic type, comprising:
Be selected to described analysis data according to described genetic type because of last association;
Generate the geochemistry plate according to selected described analysis data and described genetic type.
9. method as claimed in claim 2 is characterized in that, described method also comprises: picked at random the 5th sample from described multi-disc sample, and described the 5th sample carried out the cathodoluminescence analysis.
10. method as claimed in claim 2 is characterized in that, described method also comprises: picked at random the 6th sample from described multi-disc sample, and described the 6th sample carried out the casting body flake analysis.
11. the method for claim 1 is characterized in that, described method also comprises:
Check the correctness of described geochemistry plate according to described genetic type and described geochemistry plate.
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| CN105242026A (en) * | 2015-10-28 | 2016-01-13 | 中国石油化工股份有限公司 | Method for identifying source of gas reservoir |
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| CN105488513A (en) * | 2015-12-11 | 2016-04-13 | 中国石油天然气股份有限公司 | Dolomite karst reservoir genesis identification method and apparatus |
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| CN109763813A (en) * | 2018-12-20 | 2019-05-17 | 中国石油天然气集团有限公司 | A kind of oil gas water identification method based on multistage interpretation chart |
| CN112284993A (en) * | 2020-09-16 | 2021-01-29 | 中国石油天然气股份有限公司 | Dolomite relay bearing type pore recognition method |
| CN112284993B (en) * | 2020-09-16 | 2023-08-22 | 中国石油天然气股份有限公司 | Inheritance type pore recognition method in dolomite |
| CN112415596A (en) * | 2020-12-09 | 2021-02-26 | 大庆油田有限责任公司 | Dolomite structure type identification method based on logging information |
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