CN109083640B - Method for effectively utilizing reserve of offshore river-phase oil reservoir edge - Google Patents
Method for effectively utilizing reserve of offshore river-phase oil reservoir edge Download PDFInfo
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- CN109083640B CN109083640B CN201811127765.6A CN201811127765A CN109083640B CN 109083640 B CN109083640 B CN 109083640B CN 201811127765 A CN201811127765 A CN 201811127765A CN 109083640 B CN109083640 B CN 109083640B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
- G01V1/30—Analysis
Abstract
The invention provides an effective utilization method of offshore river facies oil deposit edge reserves, which comprises the following steps: step 1, developing fine oil reservoir description according to well completion data; step 2, well-seismic combination is developed, and a three-dimensional man-machine interaction interpretation technology and a seismic attribute processing technology are applied to finely depict the river channel sand body boundary; step 3, deploying well positions on the premise of meeting economic boundaries according to the predicted sand body thickness and the current well pattern; and 4, adjusting the well pattern according to the thickness layer encountered by the new well drilling, designing the perforation depth and layer, and realizing the maximum use of the effective reserve. The method for effectively using the reserve of the edge part of the offshore river-phase oil reservoir fully considers the characteristic of rapid distribution change of the underground reservoir of the river-phase oil reservoir, breaks through reserve loss caused by platform limitation, designs a reasonable implementation method, has better operability compared with the prior art, has innovation and practicability, and is beneficial to popularization.
Description
Technical Field
The invention relates to the field of petroleum exploitation geology fine reservoir description research, in particular to an effective utilization method of offshore river facies reservoir edge reserves.
Background
The field of Chengquan island is located in the shallow sea area of the south Bohai Bay, the upper section of the field is a main oil-containing layer system, and the main body ascertains that the oil-containing area is 65.9km2Reporting geological reserves of 1.94 multiplied by 108t. The oil field is put into development in 1993, the yield in 2017 is 321 multiplied by 104t, accounts for 13.7% of the yield of the victory oil zone.
Along with the development stage, from the condition that a new well is drilled with an oil layer, a local well pattern imperfect area exists, injection and production are unbalanced, and the development effect is influenced. There are three main reasons for analysis: firstly, the upper oil reservoir of the Chengisland oilfield venue belongs to fluvial facies deposition, the longitudinal layers are multiple and thin, the average oil-containing well section is 165m, and the sand body prediction difficulty is high; secondly, the sand body on the plane changes rapidly, and the continuity of the sand body is poor; thirdly, the pinch-off lines of the sand bodies are woven according to the traditional half of the well spacing, and the boundaries of the sand bodies cannot be truly reflected.
The upper oil deposit of the Chengquan island oilfield hall is drilled by an offshore platform and developed in a well group mode, so that economic benefits are used as the center, the aim of improving the oil production speed and the oil recovery rate by perfecting a well pattern in the effective service life period of the platform is fulfilled, and therefore the method for effectively using the edge reserves of the offshore river-phase oil deposit by combining earthquake, well logging and geological research is invented, and the technical problems are solved.
Disclosure of Invention
The invention aims to provide an effective method for using the reserve at the edge of an offshore river-phase oil reservoir, which solves the problems that a development well pattern is incomplete and the reserve cannot be used to the maximum extent due to the fact that the reservoir is possibly actually drilled and changed in the oil reservoir development process.
The object of the invention can be achieved by the following technical measures: a method for effectively utilizing an offshore river-phase margin portion reserve, comprising: step 1, developing fine oil reservoir description according to well completion data; step 2, well-seismic combination is developed, and a three-dimensional man-machine interaction interpretation technology and a seismic attribute processing technology are applied to finely depict the river channel sand body boundary; step 3, deploying well positions on the premise of meeting economic boundaries according to the predicted sand body thickness and the current well pattern; and 4, adjusting the well pattern according to the thickness layer encountered by the new well drilling, designing the perforation depth and layer, and realizing the maximum use of the effective reserve.
The object of the invention can also be achieved by the following technical measures:
in the step 1, according to the logging information, carrying out fine stratum comparison and explaining the effective thickness of a single well, and determining the thickness of an oil layer on the single well in the longitudinal direction and the distribution range of a plane oil layer; and (4) dividing the layer system according to the area, the reserve and the plane distribution, and determining the imperfect well pattern area.
In step 2, loading single-well data into a seismic library, selecting a reasonable time window to extract seismic attributes based on the well-seismic combined fine horizon calibration of the research area, and analyzing the sand body distribution range in each small layer by combining multiple attributes.
In step 2, the time thickness is obtained by counting the thickness of the small layer of the single well and the thickness of the sand body, and a corresponding time window is selected.
In step 2, the calculation process of the corresponding small layer time window is as follows:
in the formula, when T is a two-way travel, the thickness of sand and mud h are respectively the thickness of sand-mud rock, and the velocity of sand and mud v are respectively the velocity of sand-mud rock.
In step 2, the boundaries of sand bodies are predicted by extracting seismic attributes closely related to lithology.
In step 3, carrying out seismic interpretation and determining the thickness of the predicted sand body; according to the current practical offshore drilling and oil extraction investment conditions, preliminarily measuring and calculating economic limits of the upper directional well of the restaurant and the single well of the horizontal well for controlling the reserves and the initial economic limits; and finally, deploying a new well position on the basis of the original well pattern to perfect the well pattern.
In step 4, the designed new well is tracked, the effective thickness is explained by combining well logging, the depth and the horizon of the new well perforation are designed, and the well pattern is perfected, so that the maximum utilization of reserves is realized.
The method for effectively using the reserves at the edge of the offshore river-phase oil reservoir aims at the problem that the designed well pattern is incomplete due to the fact that reservoirs are actually drilled and changed in the river-phase oil reservoir development process, fully considers the characteristic that the underground reservoir distribution of the river-phase oil reservoir changes fast, breaks through the reserve loss caused by the limitation of a platform, designs a reasonable implementation method, has better operability compared with the prior art, has innovation and practicability, and is favorable for popularization. The method is applied to northwest areas, 22F and 22H well areas of ChengLang oilfield, wherein 2 new wells are drilled in the northwest areas, the drilling success rate is 100%, 6 new wells are designed by 22F and 22H together, one directional well and one horizontal well are drilled, the drilling success rate is 100%, and the newly increased productivity is predicted to be 4.6 multiplied by 104And t, providing technical support for the development of the beaches and shallow sea oil fields in colleges and universities.
Drawings
FIG. 1 is a top level 4 of a museum according to an embodiment of the present invention2A pattern diagram of a small-layer injection-production well;
FIG. 2 is a diagram of seismic attributes in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a well-to-seismic combination completion site in accordance with an embodiment of the present invention;
FIG. 4 is a new well completion bar graph in accordance with an embodiment of the present invention;
FIG. 5 illustrates the post-drilling upper gallery section 4 according to an embodiment of the present invention2A pattern diagram of a small-layer injection-production well;
FIG. 6 is a flow chart of an embodiment of the method for efficiently using offshore river facies margin reserves of the present invention.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
As shown in fig. 6, fig. 6 is a flowchart of the method for effectively using the offshore river facies oil depot edge reserves according to the present invention.
According to the logging information, carrying out fine stratum comparison and explaining the effective thickness of a single well, and determining the thickness of the oil layer on the single well in the longitudinal direction and the distribution range of a plane oil layer; in order to solve the problem that the Chengqi field is developed by a series of strata and the interlayer interference is serious, the series of strata needs to be divided from the area, the reserve and the plane distribution, and the imperfect well pattern area is determined.
102, carrying out well-seismic combination, and finely depicting the river sand body boundary by applying a three-dimensional man-machine interaction interpretation technology and an earthquake attribute processing technology;
loading single-well data into a seismic library, selecting a reasonable time window to extract seismic attributes based on the well-seismic combined fine horizon position calibration of a research area, and analyzing the sand body distribution range in each small layer by combining multiple attributes.
In the attribute extraction process, an accurate seismic horizon and a reasonable time window are the premise of accurately calibrating and optimizing seismic attributes. The time thickness can be obtained by counting the thickness of the small layer of the single well and the thickness of the sand body, and a corresponding time window is selected.
The corresponding small layer time window calculation process can be expressed as:
in the formula, when T is a double-pass travel, the sand and the mud are respectively sandAnd (3) the thickness of the mudstone, wherein v sand and v mud are respectively the sand-mudstone speed, and v sand is 2455.8m/s, and v mud is 2654.0 m/s. The upper section 4 of the research district is determined through comprehensive consideration and repeated tests2The single layer attribute extraction window range is 7 ms.
And predicting the boundary of the sand body by extracting seismic attributes closely related to lithology.
103, deploying well positions on the premise of meeting economic boundaries according to the predicted sand body thickness and the current well pattern;
carrying out seismic interpretation and determining the thickness of the predicted sand body; according to the current practical offshore drilling and oil extraction investment conditions, the economic limits such as the economic limit control reserves, the economic limit initial production and the like of the upper directional well of the museum and the single well of the horizontal well are preliminarily measured and calculated; and finally, deploying a new well position on the basis of the original well pattern to perfect the well pattern.
And step 104, adjusting the well pattern according to the thickness layer encountered by the new well, designing the perforation depth and layer, and realizing the maximum use of the effective reserve.
The designed new well is tracked, the effective thickness is explained by combining well logging, the depth and the horizon of the new well perforation are designed, the well pattern is perfected, and therefore the maximum utilization of reserves is realized.
In an embodiment of the present invention, the upper portion 4 of the ChengLang oilfield2The single layer is taken as an example to illustrate the specific implementation method.
(1) Figure 1 is a plot of the effective thickness contour of individual sub-layers compiled from a log interpretation of an existing completed well. Combining the distribution condition of the longitudinal main force oil layer, carrying out layer system subdivision, and drawing an injection-production well pattern diagram, thereby determining that the area needing to be implemented is between 26A-5 and 22 FA-7;
(2) FIG. 2 is a diagram of well completion data added to a seismic library to analyze well-seismic correlations and predict sand boundaries by extracting seismic attributes closely related to lithology; carrying out reservoir inversion under the guidance of a deposition mode, and finely depicting the thickness of the sand body at the edge;
(3) FIG. 3 is a schematic diagram of a well location optimization, target coordinates determination, and well trajectory design according to development technology policies, in combination with well seismic data, in combination with drilling engineering;
(4) FIG. 4 is a second explanation of logging for a newly deployed 22FB-16 well, to achieve reservoir thickness;
(5) and 5, adjusting the layer system according to the development longitudinal and plane distribution characteristics of the reservoir when the new well is drilled, and redrawing the injection-production well pattern diagram to realize the maximum utilization of the edge reserves.
Claims (1)
1. A method for effectively utilizing an offshore river-phase margin reserve, characterized by comprising:
step 101, developing fine oil reservoir description according to well completion data, longitudinally subdividing a layer system, implementing a well pattern, and determining an imperfect region of a local well pattern; according to the logging information, carrying out fine stratum comparison and explaining the effective thickness of a single well, and determining the thickness of the oil layer on the single well in the longitudinal direction and the distribution range of a plane oil layer; dividing a layer system according to the area, the reserve and the plane distribution, and determining a well pattern imperfect area;
102, carrying out well-seismic combination, and finely depicting the river sand body boundary by applying a three-dimensional man-machine interaction interpretation technology and an earthquake attribute processing technology;
loading single-well data into a seismic library, selecting a reasonable time window to extract seismic attributes based on the well-seismic combined fine horizon calibration of a research area, and analyzing the sand body distribution range in each small layer by combining multiple attributes;
in the attribute extraction process, an accurate seismic horizon and a reasonable time window are the premise of accurately calibrating and optimizing seismic attributes; calculating the time thickness by counting the thickness of the small layer of the single well and the thickness of the sand body, and selecting a corresponding time window;
the corresponding small layer time window calculation process is expressed as:
when T is a two-way travel, h sand and h mud are respectively the thickness of sand-shale, v sand and v mud are respectively the sand-shale speed, v sand =2455.8m/s and v mud =2654.0m/s are taken;
predicting the boundary of the sand body by extracting seismic attributes closely related to lithology;
103, deploying well positions on the premise of meeting economic boundaries according to the predicted sand body thickness and the current well pattern; carrying out seismic interpretation and determining the thickness of the predicted sand body; according to the actual drilling and oil extraction investment conditions at sea, the economic limit control reserves and the economic limit initial production economic limit of the upper directional well and the single well of the horizontal well of the building are measured and calculated; finally, deploying a new well position on the basis of the original well pattern to perfect the well pattern;
and step 104, adjusting the well pattern according to the thickness layer encountered by the new well, designing the perforation depth and layer, and realizing the maximum use of the effective reserve.
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