CN111624677B - Compact sandstone gas reservoir single-phase river channel sand body boundary depicting method - Google Patents
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Abstract
The invention relates to a compact sandstone gas reservoir single-stage riverway sand body boundary delineation method, which comprises the steps of dividing a stratum framework according to the sand body development characteristics of a target area, then carrying out single-sand body stage division, obtaining the extension direction of single-stage riverway sand bodies according to the vertical stage division result of the single-stage riverway sand bodies, and judging whether a well position meets the single-stage riverway sand bodies or not in the extension direction of the single-stage riverway sand bodies. The method solves the problem that the single-stage river channel sand body boundary cannot be accurately carved due to the thin thickness and the low geophysical prospecting precision of the single-stage river channel sand body.
Description
Technical Field
The invention relates to the technical field of gas field stratum division comparison, in particular to a compact sandstone gas reservoir single-phase river channel sand body boundary depicting method.
Background
With the continuous promotion of the development degree, the reserve utilization degree is higher and higher, the mining and submerging of old areas become a main development means for gas reservoir stable production, but the residual gas distribution is scattered, particularly in the development of river-phase compact sandstone gas reservoirs, the reservoir has the characteristics of quick longitudinal and transverse changes of sand bodies, large differences of reservoir physical properties and gas content, strong heterogeneity and the like, the research difficulty of the residual gas distribution is increased, the research on the composite sand body cannot accurately describe the residual gas distribution, and the development of gas fields cannot be met.
The application publication No. CN 10469896A patent application discloses a small sand body boundary identification method and a small sand body space quantitative description method, which summarize reservoir seismic response characteristics through seismic forward modeling, perform seismic profile identification and interpretation, perform frequency division processing on an earthquake, extract seismic attributes of different frequency bands, apply known well data analysis, optimize seismic attributes with better corresponding effects with the reservoir and sand bodies, and comprehensively apply geological laws, sand body seismic response characteristics and frequency division seismic attribute analysis to finely carve sand bodies.
Disclosure of Invention
The invention aims to provide a compact sandstone gas reservoir single-phase river channel sand body boundary delineation method, which is used for solving the problem that the delineation of the single-phase river channel sand body boundary is not accurate enough due to thin thickness and low geophysical prospecting precision of the single-phase river channel sand body.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides a compact sandstone gas reservoir single-stage riverway sand body boundary delineation method, which comprises the following steps:
1) carrying out stratum framework division according to the sand body development characteristics of the target area, and then carrying out single sand body period sub-division, thereby obtaining the vertical period sub-division of the single-period river sand body of the target horizon;
2) according to the vertical period sub-division result of the single-period riverway sand body, projecting the logging curve of the same layer position of each well position on a well position diagram, and judging the position of the corresponding well position on the single-period riverway sand body according to the shape of the logging curve, so as to obtain the extension direction of the single-period riverway sand body;
3) and in the extension direction of the single-stage river channel sand body, judging whether the well position meets the single-stage river channel sand body or not according to the well position data, if so, depicting the boundary of the single-stage river channel sand body according to the well position real drilling data, and if not, depicting the boundary according to the width-thickness ratio of the single-stage river channel sand body.
The invention has the beneficial effects that:
according to the method, stratum grillage division is carried out according to the sand body development characteristics of a target area, then single-sand-body stage division is carried out, the extension direction of the single-stage river channel sand body is obtained according to the vertical stage division result of the single-stage river channel sand body, and whether the well position meets the single-stage river channel sand body or not is judged in the extension direction of the single-stage river channel sand body. The problem of because single-phase river course sand body thickness is thin, the geophysical prospecting precision is low and lead to the not accurate enough to single-phase river course sand body border is solved.
Further, in the step 1), the single sand body period division is realized by adopting a mudstone interlayer identification method, a marker layer equidistant method, a sand body slicing method or a rock-electricity comparison method, so that the accuracy of the single sand body period division is favorably improved.
Further, in the step 2), combining the stage division results of the sand bodies of the single-stage riverway, the sand bodies in the middle of the riverway are sequentially connected by using a bead stringing method, and the extending track of the sand bodies indicates the extending direction of the riverway.
Further, in step 3), the well position data comprises vertical well data and horizontal well data, and the horizontal well data comprises pilot hole well data and horizontal segment data; if the horizontal well drill meets the single-stage river sand body, performing boundary delineation according to the horizontal section data; if the horizontal well is not drilled to meet the single-stage river sand body and the vertical well and/or the pilot hole well is drilled to meet the single-stage river sand body, performing boundary delineation according to the data of the vertical well and/or the pilot hole well; further improving the accuracy of the sand description of the single-stage river channel.
Drawings
FIG. 1 is a schematic flow chart of a method of an embodiment of the present invention;
FIG. 2 is a diagram of the sand body period subdivision of a single-stage river channel according to an embodiment of the invention;
fig. 3 is a bead-string method for identifying a river course extension directional diagram according to an embodiment of the invention;
FIG. 4a is a schematic diagram of a straight well drilling single-stage river sand body in the embodiment of the invention;
FIG. 4b is a schematic diagram of a vertical well and a pilot hole well without drilling single-stage river sand in the embodiment of the invention;
fig. 5 is a diagram illustrating a single-stage river sand boundary depicting actual drilling data in a horizontal segment according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
The basic principle of the invention is as follows:
carrying out stratum framework division according to the sand body development characteristics of the target area, and then carrying out single sand body period secondary division, thereby obtaining the vertical distribution of the single-period river sand body of the target layer; projecting a logging curve corresponding to the single-phase river channel sand body divided by each single well onto a well pattern, and judging the trend of the river channel and the position of the corresponding well position in the single-phase river channel sand body according to the shape of the logging curve, so as to obtain the extension direction of the single-phase river channel sand body; and in the extension direction of the single-stage river channel sand body, judging whether the well position meets the single-stage river channel sand body boundary or not according to the actual drilling data of the well position, if so, depicting the single-stage river channel sand body boundary according to the well position data, and if not, depicting the single-stage river channel sand body boundary according to the width-thickness ratio of the single-stage river channel sand body.
The method is shown in figure 1, and comprises the following steps:
step 1: and determining the vertical distribution of the sand bodies of the single-stage riverway by stage division of the single sand bodies on the basis of stratum grid division according to the geological condition of the target area.
The geological condition refers to a stratum-divided marker layer, firstly, stratum framework division is carried out according to the stratum-divided marker layer of a target area, then, small-layer division is carried out according to the marker layer in each stratum framework on the basis of the stratum framework division, and finally, single sand body stage division is carried out on the basis of the small-layer division. The single sand body period division is based on sand body development characteristics including river course sand body trend, river course width, sand body thickness and the like, and can be carried out by adopting a mudstone interlayer identification method, a marker layer equidistant method, a sand body slicing method or a rock-electricity contrast method according to different sand body development conditions.
Step 2: and carrying out curve positioning according to the logging data of the actual drilling straight well and the horizontal well pilot hole well, and judging the position of the single-stage river channel sand body where each well is located and the extension direction of the single-stage river channel sand body.
The method comprises the steps of combining the results of the sub-division of the sand body period of a single-period river channel, throwing a logging curve of the same period onto a well map, and judging whether a single well in the same river channel is positioned in the middle or the edge of the sand body of the river channel according to the distribution condition of the characteristic of the logging curve of the same period on a plane, wherein wells corresponding to smooth box-type logging curves and micro-tooth box-type logging curves are positioned in the middle of the river channel, wells corresponding to funnel-type logging curves are positioned in the edge, boxes with serious tooth are probably positioned at the junction of the river channels of two periods, and the smooth box-type logging curves, the micro-tooth box-type logging curves and the boxes with serious tooth are box-type curves which are mainly different in the content of mud in the sand body, the content of mud is higher, the tooth content is more serious, and the reservoir is not good. The distribution of each well in single-phase river channel sand bodies can be determined through the logging shape of each well, in order to determine the extension direction of the river channel sand bodies, the single wells in the middle of the river channel sand bodies need to be counted, the sand bodies in the same layer in the single wells in the middle of the river channel are sequentially connected through a bead string method, and the extension track of the sand bodies indicates the extension direction of the river channel sand bodies.
And step 3: and the river channel sand body boundary is carved by using a close well pattern dissection and horizontal section real drilling analysis means, so that the fine carving of the river channel sand body is realized.
Judging whether the well position meets the single-stage river sand body or not according to well position real drilling data in the extending direction of the single-stage river sand body, if so, depicting the boundary of the single-stage river sand body according to the well position real drilling data, and if not, depicting the boundary according to the width-thickness ratio of the single-stage river sand body; the well position actual drilling data comprises vertical well data and horizontal well data, and the horizontal well data comprises pilot hole well data and horizontal section data; if the horizontal well drill meets the single-stage river sand body, performing boundary carving according to the horizontal section data; if the horizontal well is not drilled to meet the single-stage river sand body, and the vertical well and/or the pilot hole well is drilled to meet the single-stage river sand body, the boundary is drawn according to the data of the vertical well and/or the pilot hole well. When the horizontal well section drill encounters sand bodies, if the extension trend of the horizontal well section is consistent with the trend of the sand bodies of the river channel, the fine engraving of the single-stage river channel sand body boundary can be realized according to the actual drilling data of the horizontal well section, namely according to the change of the sand bodies of the target layer in the actual drilling data of the horizontal section and the change trend of the structures of the sand top and the sand bottom; when a vertical well or a horizontal well pilot hole drill encounters a single-stage river sand body, the single-stage river sand body boundary is carved according to corresponding real drilling data, for example, the thickness of the single-stage river sand body encountered by the A vertical well drill is 10m, the thickness of the single-stage river sand body encountered by the B vertical well drill is 4m, the C vertical well drill does not encounter the C vertical well, and A, B, C three wells are adjacent, which indicates that one boundary of the single-stage river sand body is between the B well and the C well; and when the actual drilling straight well and the horizontal well pilot hole well do not drill the single-phase river channel sand body boundary, the width-thickness ratio of the river channel sand body at the target layer of the research area needs to be counted, and the single-phase river channel sand body boundary is calculated according to the width-thickness ratio of the river channel sand body at the single phase of the target layer of the research area.
When the method is specifically applied to engineering, the steps are as follows:
1) according to the geological condition and the sand development characteristics of a developed area, determining the width of the single-stage river channel sand in the target area to be about 1000-2000m and the thickness of the sand to be about 3-10m according to the mode of the step 1, vertically dividing the single-stage river channel sand, and vertically obtaining two layers of single-stage river channel sand, as shown in figure 2, including a first-stage single sand and a second-stage single sand.
2) And projecting a logging curve corresponding to the single-phase river channel sand body divided by each single well onto a well map by combining the sub-division results of the single-phase river channel sand body period, judging the trend of the river channel and the position of a corresponding well position in the single-phase river channel sand body according to the shape of the logging curve, and thus obtaining the extension direction of the single-phase river channel sand body, wherein the well corresponding to a smooth box type and micro-dentation box type logging curve is positioned in the middle of the single-phase river channel sand body, the well corresponding to a funnel type logging curve is positioned on the edge of the single-phase river channel sand body, and the well corresponding to a box type logging curve with severe dentation is positioned at the intersection of the two-phase river channel sand body.
For the single well corresponding to the statistical box-type well logging curve, the sand bodies in the non-river channel center are not counted, the sand bodies in the same layer in the single well in the river channel center are sequentially connected by using a bead string method, the extending track indicates the extending direction of the single-stage river channel sand bodies, and for the example, the result is shown in fig. 3, and the dotted line with an arrow indicates the extending direction of the single-stage river channel sand bodies.
3) On the basis of 2), dissecting and depicting the boundary of the single-stage river course sand body in an area with a high well pattern degree by adopting a dense well pattern, and depicting the boundary of the single-stage river course sand body according to well logging information and logging information, if the horizontal well drill meets the single-stage river course sand body, depicting the boundary according to real rock drilling information of a horizontal section of the horizontal well, specifically, depicting the boundary of the single-stage river course sand body by utilizing the structure change trend of the sand body in the single-stage river course sand body, a sand top and a sand bottom and combining the real drilling information of the horizontal section, wherein the result is shown in fig. 5; if the horizontal well does not drill and meets the single-stage river sand body, and the pilot hole well of the vertical well and the horizontal well drills and meets the single-stage river sand body, as shown in fig. 4a, wherein GR is a natural gamma curve (influenced by mud content), and LLD is a deep induction resistivity curve, the boundary of the single-stage river sand body is described according to the actual drilling data of the pilot hole wells of the vertical well and the horizontal well; if the pilot hole wells of the vertical well and the horizontal well do not drill and meet the single-phase river channel sand body, as shown in fig. 4b, the width-thickness ratio of the single-phase river channel sand body needs to be counted, the single-phase river channel sand body boundary is calculated through the width-thickness ratio of the single-phase river channel sand body, and the width-thickness ratio of the target layer single-phase river channel sand body in the research area is counted in a large quantity, namely, about 148: and 1, estimating the width range of the single-stage river channel sand body according to the width-thickness ratio and the thickness of the single-stage river channel sand body.
4) Through methods of close well pattern dissection, horizontal section real drilling analysis and the like, the width of a single-stage river channel sand body of a target horizon in a target area is carved by about 1000-1500m, and the newly drilled SP-224 well is predicted to be a river channel boundary at a position of about 400m of the length of the horizontal section, the length of the horizontal section real drilling sand body is 419m, and mudstone is formed after 420m (the result is shown in figure 5), so that the accuracy of the single-stage river channel sand body boundary carving is fully verified.
Claims (2)
1. A compact sandstone gas reservoir single-stage riverway sand body boundary depicting method is characterized by comprising the following steps:
1) carrying out stratum framework division according to the sand body development characteristics of the target area, and then carrying out single sand body period sub-division, thereby obtaining the vertical period sub-division of the single-period river sand body of the target horizon;
the stage division of the single sand body is realized by a mudstone interlayer identification method, a marker layer equidistant method, a sand body slicing method or a rock-electricity comparison method;
2) according to the vertical period sub-division result of the single-period river channel sand body, projecting the logging curves of the same layer positions of all the well positions on a well position map, and judging the positions of the corresponding well positions on the single-period river channel sand body according to the shapes of the logging curves so as to obtain the extension direction of the single-period river channel sand body;
the method comprises the following steps that a well corresponding to a smooth box-type logging curve and a micro-tooth box-type logging curve is located in the middle of a river channel, a well corresponding to a funnel-type logging curve is located at the edge of the river channel, a well corresponding to a box-type logging curve with serious tooth is located at the junction of the river channel in two periods, single wells in the middle of river channel sand bodies are counted, the sand bodies in the same layer in the single wells in the middle of the river channel are sequentially connected through a bead stringing method, and the extending track of the sand bodies indicates the extending direction of the river channel sand bodies;
3) and judging whether the well position meets the single-stage river sand body or not according to the well position data in the extension direction of the single-stage river sand body, if so, depicting the boundary of the single-stage river sand body according to the well position real drilling data, and if not, depicting the boundary according to the width-thickness ratio of the single-stage river sand body.
2. The tight sandstone gas reservoir single-phase river sand body boundary delineation method of claim 1, wherein in step 3), the well position actual drilling data comprises vertical well data and horizontal well data, and the horizontal well data comprises pilot hole well data and horizontal segment data; if the horizontal well drill meets the single-stage river sand body, performing boundary carving according to the horizontal section data; if the horizontal well is not drilled to meet the single-stage river sand body, and the vertical well and/or the pilot hole well is drilled to meet the single-stage river sand body, the boundary is drawn according to the data of the vertical well and/or the pilot hole well.
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| CN112068213A (en) * | 2020-09-21 | 2020-12-11 | 中国石油天然气股份有限公司 | River delta facies sand body configuration prediction method |
| CN111997604B (en) * | 2020-10-16 | 2023-12-08 | 陕西延长石油（集团）有限责任公司 | Single-stage river boundary identification method |
| CN112684512B (en) * | 2021-01-05 | 2023-09-26 | 中国石油天然气股份有限公司 | River channel identification method |
| CN113158274B (en) * | 2021-05-08 | 2022-07-05 | 北京金阳普泰石油技术股份有限公司 | Method and system for modeling sand body between wells |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837319A (en) * | 2016-12-27 | 2017-06-13 | 中国石油天然气股份有限公司 | A kind of underground single ancient stream channel recognition methods under the conditions of dense well pattern |
| CN107013207A (en) * | 2017-04-28 | 2017-08-04 | 中国石油化工股份有限公司 | A kind of method for obtaining Complex Fault Block Oil Reservoir sand body underground well location information |
| CN107728227A (en) * | 2017-10-18 | 2018-02-23 | 中国石油天然气股份有限公司 | A kind of well pattern maturation zone Quick buried channel sand body method |
| EP3444640A1 (en) * | 2017-08-17 | 2019-02-20 | China University Of Geosciences (Beijing) | Method and device of predicting reservoir sand bodies based on a wind field-provenance-basin system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101479732A (en) * | 2006-05-10 | 2009-07-08 | 贝克休斯公司 | Use of multi-component measurements in delineating geology of deep-water sediments |
-
2019
- 2019-02-27 CN CN201910147205.5A patent/CN111624677B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837319A (en) * | 2016-12-27 | 2017-06-13 | 中国石油天然气股份有限公司 | A kind of underground single ancient stream channel recognition methods under the conditions of dense well pattern |
| CN107013207A (en) * | 2017-04-28 | 2017-08-04 | 中国石油化工股份有限公司 | A kind of method for obtaining Complex Fault Block Oil Reservoir sand body underground well location information |
| EP3444640A1 (en) * | 2017-08-17 | 2019-02-20 | China University Of Geosciences (Beijing) | Method and device of predicting reservoir sand bodies based on a wind field-provenance-basin system |
| CN107728227A (en) * | 2017-10-18 | 2018-02-23 | 中国石油天然气股份有限公司 | A kind of well pattern maturation zone Quick buried channel sand body method |
Non-Patent Citations (3)
| Title |
|---|
| Shallow Gas Distribution Character of Heidimiao Reservoir in Southern Daqing-Changyuan Based on High-resolution Sequence Stratigraphy;Huanjun JIA;《Advanced Materials Research》;20121213;第48-51页 * |
| 浅水三角洲相多期窄河道砂体结构研究—以渤海海域渤中25-1南油田为例;李超等;《中国石油勘探》;20161130;第21卷(第6期);第48-51页 * |
| 浅水湖盆三角洲分流河道单砂体精细识别与应用;王玥等;《大庆石油地质与开发》;20171031;第36卷(第5期);第45-47页 * |
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