CN102071929B - Method for generating dolomite reservoir geochemical plate - Google Patents
Method for generating dolomite reservoir geochemical plate Download PDFInfo
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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 method for generating dolomite reservoir geochemical plate 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 in global range, ratio has also surpassed 50% (Zenger et al., 1980).In recent years, the exploration of Marine Carbonates In China was also in continuous breakthrough, particularly found successively a plurality of Large Oils gas fields to have disclosed the dolomite reservoir and had huge potentiality in the dolomite reservoir.In carbonate rock, the dolomite proportion is very large, grows from Sinian system to the Lower Ordovician Series that dolomite is thick reaches 2000 meters, but because the dolomite exploration is started late, data accumulation is inadequate, depends merely on petrologic method understanding dolomite Reservoir type reliability inadequate.
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 Distribution rule and further exploration and development, there is no at present ripe dolomite reservoir origin types recognition technology both at home and abroad.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 analyzes dolomite Reservoir type and the origin cause of formation, 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 for same group of structure, be unfavorable for so clearly being familiar with dolomite reservoir genesis mechanism, the formation environment that discloses is bright and clear not, therefore inadequate for the origin cause of formation and the distribution law illustration power of dolomite reservoir.
Summary of the invention
The invention provides a kind of method for generating dolomite reservoir geochemical plate, with profound level understanding dolomite reservoir genesis mechanism, and can carry out faster dolomite reservoir origin types identification accurately by the geochemistry plate.
The invention provides a kind of method for generating dolomite reservoir geochemical plate, 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 geochemical plate of the present invention, can identify quickly and accurately the dolomite reservoir origin types, compare with conventional method, to the reservoir Genetic Explanation more accurately and reliably, more can form mechanism and Dominated Factors from be familiar with reservoir profoundly; In the situation that drilling hole number is inadequate in the plane, be aided with the background informations such as deposition and structure, 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 present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.In the accompanying drawings:
Fig. 1 is embodiment of the present invention method for generating dolomite reservoir geochemical plate flow chart;
Fig. 2 is embodiment of the present invention dolomite reservoir geochemical plate product process figure;
Fig. 3 A is the different dolomite reservoir origin types MgO of the embodiment of the present invention and CaO graph of a relation;
Fig. 3 B be the embodiment of the present 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 present invention δ
13C and δ
18The O graph of a relation;
Fig. 3 D is the different dolomite reservoir origin types of embodiment of the present invention partition of rare earth element ideograph.
The specific embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the present invention is clearer, below in conjunction with accompanying drawing, the embodiment of the present invention is described in further details.At this, illustrative examples of the present invention and explanation thereof are used for explanation the present invention, but not as a limitation of the invention.
The object of the invention is the profound Tarim Basin dolomite reservoir genesis mechanism of being familiar with, and can carry out faster dolomite reservoir origin types identification accurately by the geochemistry plate, can carry out different origins type dolomite reservoir development analysis of distribution in conjunction with sedimentation setting and diagenesis evolution, instruct further dolomite exploration direction.
As shown in Figure 1, the method for generating dolomite reservoir geochemical plate of the 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.
In 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: choose at random the first sample, the second sample, the 3rd sample and the 4th sample from described multi-disc sample, described the first sample is carried out electron probing analysis, described the 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 the 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 the 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,
In step S103, determine the genetic type of dolomite reservoir according to described multi-disc sample, comprising: the genetic type of determining described dolomite reservoir according to sedimentation setting, weather conditions and the diagenesis evolution of described dolomite reservoir.
In step S104, generate the geochemistry plate according to described analysis data and genetic type, comprising: be selected to described analysis data because of upper association according to described genetic type; Generate the geochemistry plate according to selected described analysis data and described genetic type.
In addition, except in step S102, the multi-disc sample being carried out electron probing analysis, laser carbon oxygen isotope analysis, strontium isotope analysis and rare earth elemental analysis, also comprise from described multi-disc sample and choose at random the 5th sample, described the 5th sample is carried out the cathodoluminescence analysis and choose 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 the present embodiment method for generating dolomite reservoir geochemical plate in detail below in conjunction with Fig. 2.In Fig. 2, with the solid line direction of the arrow method step for the experiment sample, with the dotted line direction of the arrow method step for the check sample.The present invention utilizes the experiment sample to generate dolomite reservoir geochemical plate, utilize the check sample to chemissues map generalization test.
As shown in Figure 2, the detailed step of the 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 rear the giving birth to of lithotope and experience transformed; The sample of sampling need to 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 to 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, first grind two cover thin slice (interplanting cathodoluminescences, the one interplanting body of casting (blueness), cathodoluminescence is observed each feature of fabric from the origin cause of formation, further choose selective analysis group structure, half uses Alizarin red staining the blue body of casting, distinguishes dolomite and calcite, is familiar with simultaneously the reservoir pore space feature); Then grind other two cover thin slices, 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 as far as possible that the analysis bank structure is consistent.Then send the laboratory experiment Analysis to get group structure, get final product by existing experiment analytical method.
After step 2 finishes, can set up a packet to each sample, comprise: one, 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, take step 1 core observation result as the basis, the observation of the thin slice that integrating step 2 grinds, the dolomite reservoir origin types is determined in the aspects such as comprehensive sedimentation setting (geologic setting in Fig. 2), weather conditions and diagenesis evolution.
The 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.Diagenetic Evolution 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, evaporate tableland dolomite reservoir, bury dolomite reservoir and hydrothermal solution dolomite reservoir) in Fig. 3 A to Fig. 3 D as shown in Fig. 3 A to Fig. 3 D.Fig. 3 A is the different dolomite reservoir origin types MgO of the embodiment of the present invention and CaO graph of a relation, Fig. 3 B be the embodiment of the present 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 present invention δ
13C and δ
18O graph of a relation, Fig. 3 D are the different dolomite reservoir origin types of embodiment of the present 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 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 rectangular coordinate system, and rare earth element needs first to carry out standardization with the chondrite ree content, and (measured 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 random experimental analysis data that keep the sample that accounts for total number of samples 1% 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 the matching of correspondence analysis result, and the correspondence of such analysis result and these other analysis results of sample, as can't corresponding or coupling, this sample should be rejected.As evaporate the depositional environment that tidal flat dolomite reservoir is formed at rapid crystallization, and take dolomicrite as main, 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 seawater carbonate
13The feature (Fig. 3 C) that C (low on the occasion of) tool is partially negative; The evaporation tidal flat is take low-temperature alkali and oxidation environment as feature, 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 by the migration dilution, Eu negative anomaly (Fig. 3 D) occurs, 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 correctness and the generality of plate, draw a circle to approve the scope on 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 refers to that the geochemical indicators that the dolomite reservoir forms under environment is whether consistent with the information that discloses in plate.As unanimously can be used as recognition template, reanalyse step 3 as inconsistent need) accuracy.Fig. 3 A to Fig. 3 D is the geochemistry plate of dissimilar dolomite reservoir, wherein evaporating tableland dolomite reservoir is the product that diagenetic environment is hidden in shallow embedding, (Mg/Ca) is medium for dolomite crystallization degree and the degree of order, and MgO-CaO is negative linear 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); To be tending towards higher δ under the violent evaporation condition
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 seawater carbonate
13The feature (Fig. 3 C) that C (low on the occasion of) tool is partially negative; The evaporation tableland is take low-temperature alkali and oxidation environment as feature, 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 occurs, therefore 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 with the method for step 3), the experiment analysis results cultellation in plate, is checked the correctness of plate, as inconsistent in the cultellation scope, need re-start step 3 and step 4.
Use the present invention, in the situation that can't clearly distinguish the dolomite Reservoir type on petrology, can identify quickly and accurately the dolomite reservoir origin types, compare with conventional method, logic analysis is stronger, to the reservoir Genetic Explanation more accurately and reliably, more can form mechanism and Dominated Factors from be familiar with reservoir profoundly, in the situation that drilling hole number is inadequate in the plane, be aided with the background informations such as deposition and structure, 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 developing stratum and the distribution of Tarim Basin Cambrian system-Lower Ordovician Series four class dolomite reservoirs (evaporate tidal flat dolomite reservoir, evaporate 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 is only specific embodiments of the invention; the protection domain that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a method for generating dolomite reservoir geochemical plate, 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;
Choose at random the first sample, the second sample, the 3rd sample and the 4th sample from described multi-disc sample, described the first sample is carried out electron probing analysis, described the 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; Wherein, the analysis data of described the first sample being carried out the electron probing analysis generation are relative amount and the Mg/Ca value of CaO and MgO, and the analysis data of described the 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 4th sample being carried out the rare earth elemental analysis generation are the abundance of rare earth element;
Determine the genetic type of described dolomite reservoir according to described multi-disc sample, namely determine the genetic type of described dolomite reservoir according to sedimentation setting, weather conditions and the diagenesis evolution of described dolomite reservoir;
Be selected to described analysis data because of upper association according to described genetic type;
Generate the geochemistry plate according to selected described analysis data and described genetic type.
2. the method for claim 1, is characterized in that, described method also comprises: choose at random the 5th sample from described multi-disc sample, and described the 5th sample is carried out the cathodoluminescence analysis.
3. the method for claim 1, is characterized in that, described method also comprises: choose at random the 6th sample from described multi-disc sample, and described the 6th sample is carried out the casting body flake analysis.
4. the method for claim 1, is characterized in that, described method also comprises:
Correctness according to described genetic type and the described geochemistry plate of described geochemistry plate check.
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| CN102352749B (en) * | 2011-09-19 | 2013-10-16 | 中国石油天然气股份有限公司 | Recognition method and device of effective reservoirs of dolomite of karstic weathering crust |
| CN104076038B (en) * | 2013-03-29 | 2017-04-05 | 中国石油天然气股份有限公司 | A kind of common diagenetic fabric characteristic present of carbonate rock and origin cause of formation recognition methodss |
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| CN107035365B (en) * | 2017-03-28 | 2021-03-09 | 中国石油天然气股份有限公司 | Method and device for distinguishing property of dolomite lithification fluid |
| CN107728232B (en) * | 2017-11-06 | 2019-07-09 | 中国石油天然气股份有限公司 | A kind of petrology and Geochemical Method Distinguishing method and system of dolomite genesis type |
| 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 |
| 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 |
| CN112415596B (en) * | 2020-12-09 | 2022-09-06 | 大庆油田有限责任公司 | Dolomite structure type identification method based on logging information |
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