CN107013207B - Method for acquiring underground well position information of complex fault block oil reservoir sand body - Google Patents
Method for acquiring underground well position information of complex fault block oil reservoir sand body Download PDFInfo
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Abstract
The invention relates to a method for acquiring sand body underground well position information of a complex fault block oil reservoir in the technical field of oil and gas field development. The method can quickly, effectively and accurately extract the sand body underground well position information, forms a small layer or a plane figure of the sand body, and ensures the reliability of extracting the sand body underground well position information. The method can enable geologists to quickly and well complete the plan view of the small layer or the sand body, has the characteristics of less processes and high efficiency, obviously shortens the drawing period, can flexibly generate drawings meeting different requirements, and can realize fine reservoir description by taking the small layer or the sand body as a unit.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a method for acquiring underground well position information.
Background
⑴ connotation of sand underground well position information
The sand body underground well position information represents the plane projection position from the well drilling to the underground sand body and the related attribute characteristics. The method comprises the following steps of underground well position coordinates of a well drilling sand body, the top depth, the bottom depth, the thickness, the effective thickness, an electrical measurement interpretation serial number, the porosity, the permeability, the oil saturation, the argillaceous content, the carbonate content, the interlayer thickness, the interlayer frequency, the interlayer density and the like.
⑵ status quo of oil field development data management
Research on developing reservoirs in oilfield development is generally managed according to five tables, namely a drilling geological information table, a well deviation data table, a stratum layering data table, a sand body data table and a breakpoint data table.
① drilling geological information table for managing the ground position, drilling and drilling completion information of the well;
② well deviation data sheet, managing well deviation information of each well;
③ stratum layer data table for managing the information of stratum layer encountered by each well;
④ sand body data table for managing the information of sand body in each interval when each well is drilled and the current sand body data table only explains and stores the reservoir, and there is no corresponding method for representing sand body in the data table when sand body is extinguished, broken or not drilled;
⑤ breakpoint data table for managing the information of the drilling and contact breakpoints and the comparison wells on each well, the storage of the current position of the breakpoints data table is not standard, some are expressed by stratum, some are expressed by sand layer group, and some are expressed by sand body.
And after the five tables are put in storage, correcting the well deviation, the stratum layering, the sand body and the breakpoint through a well deviation correction system, so that well deviation correction data, stratum layering correction data, sand body correction data and breakpoint correction data of each well are obtained. In the correction system, subsurface coordinate corrections are added for each well for each correction point (depth).
⑶ importance of obtaining sand underground well position information
With the development of oil fields, fine reservoir descriptions become finer and finer, mainly on a research scale, and are smaller and smaller, and reach the sand body level. In fine reservoir description, fine research on sand bodies is an important content.
The characteristics of the sand body are researched a lot, including sand body deposition microphase, sandstone thickness, effective thickness, oil sand body plane map, sand body physical property (porosity and permeability) plane contour map, interlayer thickness, interlayer frequency and interlayer density and the like.
For example, the distribution characteristics of oil layer, the fine research of sand body is important, and the oil sand body plane diagram of each sand body is drawn, the oil sand body is the sand-containing body which is continuously distributed underground, is the basic unit for gathering oil gas and also is the independent unit for controlling the movement rule of oil water in the oil field development process, the oil sand body plane diagram is generally that the oil sand body with equivalent layer position is drawn on the same diagram by using the same sand body number, is one of the basic geological diagram pieces which are commonly used in the oil field development process and has wide application, ① provides oil-containing area for the storage calculation, ② provides basis for reasonable production allocation, ③ adjusts plane contradiction, ④ carries out the research of development object, for this purpose, firstly, the position of each well on the underground sand body in the working area must be determined, namely, the underground well position coordinates of the sand body are obtained, then the drilling condition of each well in the working area on the sand body in the sand body is obtained, and the oil layer number, the comprehensive interpretation results (effective thickness, dry layer, oil layer, sand body rule and sand body plane diagram are drawn according to the sand body plane rule.
Therefore, the sand body underground well position information is the premise and the basis of sand body fine research, and the accuracy and the reliability of sand body description are directly related to the correctness of the sand body underground well position information.
2. Problems and disadvantages of the prior art
Before the oil reservoir description software is applied, the sand body underground well position information is acquired by mainly manually uploading data to a plan, and the traditional manual drawing process is complicated, repeated in labor, low in efficiency and prone to errors.
At present, with the large-scale application of reservoir description software, the sand body underground well position information is acquired automatically from a sand body correction data table in data management mainly through reservoir description software or geological mapping software, and the problem does not exist in reservoirs with relatively simple geological conditions. However, for complex fault block oil reservoirs, due to complex geological conditions such as structural fracture, fault development, reservoir phase becoming fast, oil-containing well section becoming long and the like, well drilling is often incomplete, so that information of a well drilled with incomplete sand drilling cannot be obtained, and the method is not suitable for use. Compared with the original method, the sand body data of each well is supplemented manually according to the well data, but the workload is huge and tedious, so that a large amount of invalid data information is increased, and the data management is difficult.
Complex geological conditions include tectonic movement, sediments, and the like. The tectonic movement can form a fault to cause the fracture of reservoir sand bodies and can also cause the lifting of the stratum to cause the erosion of the stratum sand bodies to pinch out; the sedimentation factor may cause the sand body of the overburden layer to pinch off or the phase change causes the sand body to pinch off, etc. There are also factors in the reservoir itself that cause the well to not be drilled. The well drilling whether the sand body is not broken, put away or not drilled can not be automatically obtained from the data of the existing data management five tables.
The sand body data table in the five tables of the current oilfield development data management does not have corresponding expression aiming at wells without sand body deposition, namely, the contact definition of the relation between wells and sand bodies is lacked in the sand body data table, so that corresponding geological information cannot be identified.
② the management of oil field development data is a decentralized data management mode
The decentralized data management mode can well manage data of the whole oil field in different categories, but the decentralized data management mode has the defect that different types of data of a certain well and attribute information with the same depth are difficult to manage in one data table.
③ No special research is made on the method for acquiring the sand underground well position information of the complex fault block oil reservoir
At present, mainstream reservoir description software, including Petrel, Discovery, GPT, Resform, double fox and other software, has no technical method design specially aiming at complex fault block reservoirs to obtain sand body underground well position information, namely, underground positions of broken, sharp or undrilled sand bodies and well information representation are incomplete or inaccurate, so that the description of the sand bodies of the complex fault block reservoirs is directly separated from the constraint of complex geological conditions, and the geological meaning of the complex fault blocks is lost by a drawn geological map.
How to quickly, effectively and accurately acquire the underground well position information of each sand body is a difficult problem to be solved urgently in the development of oil and gas fields of complex fault blocks.
Disclosure of Invention
The invention aims to provide a method for acquiring sand body underground well position information of a complex fault block oil reservoir, which can quickly, effectively and accurately extract the sand body underground well position information, form a small layer or plane figure of a sand body and ensure the reliability of extracting the sand body underground well position information.
The purpose of the invention is realized as follows: a method for acquiring the underground well position information of a complex fault block oil reservoir sand body is characterized by comprising the following steps:
1) standard completion of oil field development database
Establishing a standard level table: adding an oil field stratum standard layer level table in database management, and counting the total number of small layers or sand bodies of each sand layer group;
a specification database: after the standard horizon table of the oil field stratum is determined, modifying five tables in the database to enable the expression of the stratum horizon of the five tables to be consistent with the standard horizon table; when the breakpoint is put in storage, the statistics of the position of the breakpoint corresponds to the small layer or the sand body; the five tables are a drilling geological information table, a well deviation data table, a stratum layering data table, a sand body data table and a breakpoint data table;
completing the database: compared with a standard horizon table, the method is characterized in that a well which is not drilled is artificially added with a sand body behind the last sand body in a sand body data table, and the result of electrical measurement and interpretation of the added sand body is that no drilling is met;
2) the data is imaged to establish a depth-closed displacement diagram of the oil field single well information
The calibration method of the well drilled encountering sand body comprises the following steps: calibrating the geological information which is dispersed in the five tables and exists on the depth-closed displacement diagram when the well is drilled and meets the sand body;
the calibration method of the sand body when the well is not drilled comprises the following steps: identifying sand bodies which do not exist in the sand body data according to pinch-out, break-up or non-drilling, acquiring underground well position information, and then calibrating the underground well position information on a depth-closed displacement map;
3) all information on the single depth-closed displacement map is saved and used for subsequent fine reservoir description with small layers or sand bodies as units.
The method for calibrating the drilled encountering sand body of the well can be carried out according to the following steps:
the first step is as follows: drawing a depth-closing displacement graph of each well by using well deviation correction data;
the second step is that: calibrating stratum layering information in the stratum layering data table on the depth-closed displacement graph;
the third step: calibrating breakpoint information in the breakpoint data table on the depth-closed displacement graph;
the fourth step: and then calibrating the information of the small layer or the sand body in the sand body data table on the depth-closed displacement graph.
The calibration method of the sand body during the non-drilling of the well comprises the following steps:
the first step is as follows: firstly, judging the fracture situation and calibrating, determining which sand bodies on each fracture layer are fractured according to the fracture layers in the fracture data table, and calibrating on a depth-closed displacement map;
the second step is that: judging the condition of no drilling of the well and calibrating, searching whether an electric measurement interpretation result in a sand body data table has a field of no drilling, if not, indicating that the well is normally drilled, and if so, recording that all sand bodies downwards from the sand body are not drilled;
the third step: judging and calibrating the pinch-out condition of the sand body, and after determining the sand body which is broken and not encountered by the well, carrying out pinch-out on the rest sand bodies which are not calibrated;
the fourth step: and acquiring the parameter information of the attributes with the same depth, and then putting the different attributes with the same depth of each sand body on the depth-closed displacement map.
For pinch-out, if the sand body and the sand body are pinched-out, the depth of each sand body is equally divided by the bottom depth of the previous sand body and the top depth of the next sand body; if the sand body is in pinch-out between the stratum and the sand body, dividing the sand body into two conditions, wherein the first condition is that the sand body between the upper stratum and the lower sand body is in pinch-out, the depth of each pinch-out sand body is given by equally dividing the bottom depth of the upper stratum and the top depth of the sand body, and the second condition is that the sand body and the next stratum are in pinch-out, the depth of each pinch-out sand body is given by equally dividing the top depth of the next stratum and the bottom depth of the sand body; if the point between the break and the sand body is sharp, the two conditions are also divided, wherein one is that the break is on the top and the sand body is on the bottom, the depth of each sharp sand body is given by equally dividing the depth of the break point and the top depth of the sand body, and the other is that the sand body is on the top and the break is on the bottom, the depth of each sharp sand body is given by equally dividing the bottom depth of the sand body and the depth of the break point; and calibrating the pinch-out information on the depth-closing displacement graph.
The invention standardizes and completes the oilfield development database, and changes the sand underground well position information from uncertain to definite as much as possible; the method can organically combine data and graphs, graph the data, establish a new mode of oil field single well information management, and solve the problem that heterogeneous data in a data structure cannot be parallel. Compared with the prior art, the invention has the beneficial effects that: the method can quickly, effectively and accurately extract the underground well position information of the small layer or the sand body, and form a plan view, thereby ensuring the reliability of extracting the underground well position information of the sand body; all blocks and all layer systems can be seen and documented, the platform format of the graphic file is unified, and the data sharing application is strengthened. By applying the method for extracting the underground well position information of the sand body of the complex fault block oil reservoir, geologists can quickly and well complete the plan view of the small layer or the sand body, the method has the characteristics of less processes and high efficiency, the drawing period is obviously shortened, drawings meeting different requirements can be flexibly generated, resource sharing is realized to the maximum extent, the precision and the technical level of fine description of the sand body of an old oil field can be improved, fine development with the small layer and the sand body as units is realized, and the recovery ratio of the old oil field is improved to the maximum extent.
Drawings
FIG. 1 is a plot of calibrated well depth versus closed displacement for a well drilled encountering sand.
FIG. 2 is a plot of calibrated well depth versus closed displacement for an uncalled encounter with a sand body.
Fig. 2-1 is a partial enlarged view one of fig. 2.
Fig. 2-2 is a partial enlarged view of fig. 2.
FIG. 3 is a diagram of geological information calibration well depth-closed displacement for sand bodies of the same depth.
Fig. 3-1 is a partial enlarged view of fig. 3.
FIG. 4 is a schematic view of the information of the well location in the yellow Jute field X sand body.
Detailed Description
The present invention is described in further detail below using a yellow oil field as an example:
a method for acquiring the underground well position information of a complex fault block oil reservoir sand body comprises the following steps:
1) standard completion of oil field development database
Establishing a standard level table: adding an oil field stratum standard layer level table in database management, and counting the total number of small layers or sand bodies of each sand layer group; see attached table 1, which is a standard stratum level table of a yellow and dark stone oil field, the table only has the level of a small layer number, and according to different oil fields or oil wells, the oil sand body number or a single layer number can be further realized, the total number of small layers or the total number of sand bodies of each sand layer group is counted, and finally the target graph is counted to which level according to which level is needed;
yellow and black kerneled oil field standard level gauge attached to table 1
A specification database: after the standard horizon table of the oil field stratum is determined, modifying five tables in the database to enable the expression of the stratum horizon of the five tables to be consistent with the standard horizon table; when the breakpoint is put in storage, the statistics of the position of the breakpoint corresponds to the small layer or the sand body; the five tables are a drilling geological information table, a well deviation data table, a stratum layering data table, a sand body data table and a breakpoint data table; the purpose of standardizing the database is to enable a computer to smoothly capture corresponding data and enable the data of the five tables to be mutually associated according to a set rule;
for yellow yu oil field, as shown in the table above, the interrupted and missing layer position of the breakpoint library is only input to the level of YCFZMC, the old input mode is thick, and the extraction of the interrupted and missing sand body information cannot be met, and the interrupted and missing layer position needs to be input to the level of XCH at present, namely, the interrupted and missing layer position is finer than the original input mode when the breakpoint data is put in storage, the interrupted and missing layer position needs to be implemented to the level of XCH from the original level of YCFZMC, namely, the code of the missing first small layer number and the code of the last small layer number are expressed. As shown in FIG. 2, if the stratum is broken, such as the formation is broken in E2s1-5, the broken sand is marked as E2s1-5 in the original data sheet and E2s1-5-5 in the current data sheet. If the stratum E2d2-3 is broken, the original data table is recorded as E2d2-3, and the current data table is recorded as E2d2-3-2-E2d 2-3-5. If the stratum E2d2-4 has 2 breaks, the data are recorded as E2d2-4 in the original data table, and are respectively recorded as E2d2-4-2-E2d2-4-4 and E2d2-4-6-E2d2-4-10 in the current data table; if the fault is a cross-layer fault, for example, the fault is from the lower stratum of E2s1-4 to E2s1-5, which is recorded as E2s1-4-E2s1-5 in the original data sheet and is recorded as E2s1-4-7-E2s1-5-3 in the current data sheet.
Completing the database: and compared with the standard horizon table, the well which is not drilled is artificially added with one sand body behind the last sand body in the sand body data table, and the added sand body electrical measurement interpretation result is marked as non-drilling. The aim is to accurately calibrate the undrilled well in a database.
2) The data is imaged to establish a depth-closed displacement diagram of the oil field single well information
The calibration method of the well drilled encountering sand body comprises the following steps: calibrating the geological information which is dispersed in the five tables and exists on the depth-closed displacement diagram when the well is drilled and meets the sand body; specifically, the calibration method of the well drilled encountering sand body comprises the following steps:
the first step is as follows: drawing a depth-closing displacement graph of each well by using well deviation correction data;
the second step is that: calibrating stratum layering information in the stratum layering data table on the depth-closed displacement graph;
the third step: calibrating breakpoint information in the breakpoint data table on the depth-closed displacement graph;
the fourth step: and then calibrating the information of the small layer or the sand body in the sand body data table on the depth-closed displacement graph. See figure 1.
The calibration method of the sand body when the well is not drilled comprises the following steps: identifying sand bodies which do not exist in the sand body data according to the fact that the sand bodies are pinch-off, broken or not drilled, acquiring underground well position information, and then calibrating the underground well position information on a depth-closed displacement graph; specifically, the calibration method of the sand body during the non-drilling of the well comprises the following steps:
the first step is as follows: firstly, judging the fracture situation and calibrating, determining which sand bodies on each fracture layer are fractured according to the fracture layers in the fracture data table, and calibrating on a depth-closed displacement map;
the second step is that: judging the condition of no drilling and calibrating, searching whether an electric measurement interpretation result in a sand body data table has a field of no drilling, if not, indicating that the well is normally drilled, and if so, recording that all sand bodies downwards from the sand body are not drilled;
the third step: judging and calibrating the pinch-out condition of the sand body, and after determining the broken and un-drilled sand body, all the other un-calibrated sand bodies are pinch-out; for pinch-out, if the sand body and the sand body are pinched-out, the depth of each sand body at the tip is given by equally dividing the bottom depth of the previous sand body and the top depth of the next sand body, for example, n middle pinch-out sand bodies are used, which is equivalent to inserting n sand bodies between the bottom of the previous sand body and the top depth of the next sand body at equal intervals, n is a natural number, namely, the difference between the bottom depth of the previous sand body and the top depth of the next sand body is equally divided into n +1, and the position of each equally divided point is regarded as the position of the corresponding sand body (the following equally divided points are obtained in an analogous manner); if the sand body is in pinch-out between the stratum and the sand body, dividing the sand body into two conditions, wherein the first condition is that the sand body between the upper stratum and the lower sand body is in pinch-out, the depth of each pinch-out sand body is given by equally dividing the bottom depth of the upper stratum and the top depth of the sand body, and the second condition is that the sand body and the next stratum are in pinch-out, the depth of each pinch-out sand body is given by equally dividing the top depth of the next stratum and the bottom depth of the sand body; if the point between the break and the sand body is sharp, the two conditions are also divided, wherein one is that the break is on the top and the sand body is on the bottom, the depth of each sharp sand body is given by equally dividing the depth of the break point and the top depth of the sand body, and the other is that the sand body is on the top and the break is on the bottom, the depth of each sharp sand body is given by equally dividing the bottom depth of the sand body and the depth of the break point; further, the pinch-out information is calibrated on a depth-closure displacement graph, as shown in FIG. 2;
the fourth step: and acquiring the parameter information of the attributes with the same depth, and then putting the different attributes with the same depth of each sand body on the depth-closed displacement graph to obtain the result shown in figure 3.
3) All information on the single depth-closed displacement map is saved and used for subsequent fine reservoir description with small layers or sand bodies as units. As shown in figure 4, underground well position information of the X sand body of the yellow and lusterless oil field is extracted.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (3)
1. A method for acquiring the underground well position information of a complex fault block oil reservoir sand body is characterized by comprising the following steps:
1) standard completion of oil field development database
Establishing a standard level table: adding an oil field stratum standard layer level table in database management, and counting the total number of small layers or sand bodies of each sand layer group;
a specification database: after the standard horizon table of the oil field stratum is determined, modifying five tables in the database to enable the expression of the stratum horizon of the five tables to be consistent with the standard horizon table; when the breakpoint is put in storage, the statistics of the position of the breakpoint corresponds to the small layer or the sand body; the five tables are a drilling geological information table, a well deviation data table, a stratum layering data table, a sand body data table and a breakpoint data table;
completing the database: compared with a standard horizon table, the method is characterized in that a well which is not drilled is artificially added with a sand body behind the last sand body in a sand body data table, and the result of electrical measurement and interpretation of the added sand body is that no drilling is met;
2) the data is imaged to establish a depth-closed displacement diagram of the oil field single well information
The calibration method of the well drilled encountering sand body comprises the following steps: calibrating the geological information which is dispersed in the five tables and exists on the depth-closed displacement diagram when the well is drilled and meets the sand body;
the calibration method of the sand body when the well is not drilled comprises the following steps: identifying sand bodies which do not exist in the sand body data according to pinch-out, break-up or non-drilling, acquiring underground well position information, and then calibrating the underground well position information on a depth-closed displacement map; the calibration method of the sand body when the well is not drilled comprises the following steps:
the first step is as follows: firstly, judging the fracture situation and calibrating, determining which sand bodies on each fracture layer are fractured according to the fracture layers in the fracture data table, and calibrating on a depth-closed displacement map;
the second step is that: judging the condition of no drilling and calibrating, searching whether an electric measurement interpretation result in a sand body data table has a field of no drilling, if not, indicating that the well is normally drilled, and if so, recording that all sand bodies downwards from the sand body are not drilled;
the third step: judging and calibrating the pinch-out condition of the sand body, and after determining the broken and un-drilled sand body, all the other un-calibrated sand bodies are pinch-out;
the fourth step: acquiring the parameter information of the attributes with the same depth, and then placing the different attributes of each sand body with the same depth on a depth-closed displacement map;
3) all information on the single depth-closed displacement map is saved and used for subsequent fine reservoir description with small layers or sand bodies as units.
2. The method for acquiring the underground well position information of the complex fault block oil reservoir sand body as claimed in claim 1, wherein the calibration method of the drilled sand body of the well is carried out according to the following steps:
the first step is as follows: drawing a depth-closing displacement graph of each well by using well deviation correction data;
the second step is that: calibrating stratum layering information in the stratum layering data table on the depth-closed displacement graph;
the third step: calibrating breakpoint information in the breakpoint data table on the depth-closed displacement graph;
the fourth step: and then calibrating the information of the small layer or the sand body in the sand body data table on the depth-closed displacement graph.
3. The method for acquiring the underground well position information of the sand bodies of the complex fault block oil reservoirs according to claim 1, wherein in the third step, for the pinch-out, if the sand bodies are pinched-out, the depth of each sand body is given by equally dividing the bottom depth of the previous sand body and the top depth of the next sand body; if the sand body is in pinch-out between the stratum and the sand body, dividing the sand body into two conditions, wherein the first condition is that the sand body between the upper stratum and the lower sand body is in pinch-out, the depth of each pinch-out sand body is given by equally dividing the bottom depth of the upper stratum and the top depth of the sand body, and the second condition is that the sand body and the next stratum are in pinch-out, the depth of each pinch-out sand body is given by equally dividing the top depth of the next stratum and the bottom depth of the sand body; if the point between the break and the sand body is sharp, the two conditions are also divided, wherein one is that the break is on the top and the sand body is on the bottom, the depth of each sharp sand body is given by equally dividing the depth of the break point and the top depth of the sand body, and the other is that the sand body is on the top and the break is on the bottom, the depth of each sharp sand body is given by equally dividing the bottom depth of the sand body and the depth of the break point; and calibrating the pinch-out information on the depth-closing displacement graph.
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