CN112651547A - Curve river sandstone reservoir scale prediction method - Google Patents

Curve river sandstone reservoir scale prediction method Download PDF

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CN112651547A
CN112651547A CN202011460495.8A CN202011460495A CN112651547A CN 112651547 A CN112651547 A CN 112651547A CN 202011460495 A CN202011460495 A CN 202011460495A CN 112651547 A CN112651547 A CN 112651547A
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蒙晓灵
兰义飞
杨勇
刘海锋
王金成
王准备
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Abstract

The invention provides a method for predicting the scale of a meandering river sandstone reservoir, which comprises the following steps: s001: selecting and sampling each drilling well in the meandering stream area, and counting the distance between the drilling wells and the thickness of a sand encountering body of the drilling wells; s002: sequentially calculating sand body gradient rates of two adjacent drilling wells from west to east, analyzing the values, reflecting the deposition of the concave bank of the meandering stream when the thickness of the sand body is increased and the sand body gradient rate is a positive value, and reflecting the deposition of the convex bank of the meandering stream when the thickness of the sand body is reduced and the sand body gradient rate is a negative value; s003: judging the gradient rate of the meandering river concave bank sand body and the gradient rate of the meandering river convex bank sand body according to the gradient rate of the sand body of each drilling well; s004: respectively calculating the maximum extension distance of a concave bank of the meandering stream and the maximum extension distance of a convex bank of the meandering stream; s005: and calculating the river channel scale according to the maximum extension distance of the concave bank of the meandering stream and the maximum extension distance of the convex bank of the meandering stream.

Description

Curve river sandstone reservoir scale prediction method
Technical Field
The invention belongs to the technical field of oil and gas field exploitation geological research, and particularly relates to a method for predicting the scale of a meandering river sandstone reservoir.
Background
The method is mainly used for predicting the scale of the meandering river sand bodies at home and abroad by using seismic data, and in the desert area in the north of the Ordos basin, the quality of seismic survey line data is relatively good, so that a good resolution effect can be obtained. However, for the landform of the loess tableland in the south of the basin, great difficulty exists in the acquisition and analysis of seismic data. The loess plateau landform seismic data are poor in data quality due to the existence of a thick loess layer, and are always the important technical attack and clearance directions in the aspects of accuracy and precision of sand body identification. Particularly, aiming at sandstone reservoirs like deep buried reservoirs (>4500m) and thin reservoirs (4-8m) of the Qingyang gas field, the difficulty of predicting the reservoir scale by seismic data is greatly increased, and a new sandstone reservoir scale prediction method and means are urgently needed.
Disclosure of Invention
The present invention provides a method of predicting the scale of a tortuous river sandstone reservoir which overcomes, or at least partially solves or alleviates, the above problems.
Therefore, the invention provides a method for predicting the scale of a meandering river sandstone reservoir, which is characterized by comprising the following steps of:
s001: selecting and sampling all the drilling wells in the meandering stream area, and counting the distance between the drilling wells and the thickness of a sand encountering body of the drilling wells;
s002: sequentially calculating sand body gradient rates of two adjacent drilling wells from west to east, analyzing the values, reflecting the deposition of the concave bank of the meandering river when the thickness of the sand body is increased and the sand body gradient rate is a positive value, and reflecting the deposition of the convex bank of the meandering river when the thickness of the sand body is reduced and the sand body gradient rate is a negative value;
s003: judging the gradient rate of the meandering river concave bank sand body and the gradient rate of the meandering river convex bank sand body according to the gradient rate of the sand body of each drilling well;
s004: respectively calculating the maximum extension distance of a concave bank of the meandering stream and the maximum extension distance of a convex bank of the meandering stream;
s005: and calculating the river channel scale according to the maximum extension distance of the concave bank of the meandering stream and the maximum extension distance of the convex bank of the meandering stream.
In step S001, a sample point (completed well) W is screened based on a prescribed well spacing of 0.6Km1......Wn。
In step S002, the sand gradient KHRefers to the variation of the sand thickness per unit distance; kHThe formula is as follows: kH＝(Hwn-Hwn-1)/S；
Wherein, KHThe gradient rate of the sand body thickness is in the unit of m/km; wn is the sample point (completion well); hwnThe thickness of the sand body is drilled at a certain well point and the unit is m; and S is the distance between two adjacent wells.
In step S002, the meandering stream river channel sand body mainly erodes the side direction of the concave bank, the convex bank develops the edge beach for deposition, the deposited sand body has the two-side asymmetry characteristic, and K is arranged on one side of the concave bank of the meandering streamHGreater than 0, on the land side, KHLess than 0, namely representing a complete river course in one period, the meandering river sand body is the superposition of the multi-period river course in the lateral direction, KHThe values exhibit regular changes.
In step S003, the meandering stream sand body is multi-stage riverway lateral superposition deposition, and on the basis of identifying each stage of riverway, the meandering stream concave bank deposition sand body gradient rate K in the region is determined according to the analysis of a plurality of concave bank deposition sample points of 100 Qingyang gas fields and a real drilling data big databaseH concaveBetween 8m/km and 23 m/km.
In step S004, K is determined according to the concave bank sediment sample points and the maximum thickness value of the actual drilling sand body of the gas field of the target areaH concaveValue according to KHFormula and KH concaveAnd calculating the maximum extension distance of the concave bank of the meandering stream in the value range.
In step S004, K is determined according to all convex bank sediment sample points of the gas field of the target areaH convexValue average according to KHFormula and KH convexAnd calculating the maximum extension distance of the convex bank of the meandering river by the average value.
In step S005, the size of the meandering stream channel is the sum of the maximum extension distance of the meandering stream concave bank and the maximum extension distance of the meandering stream convex bank.
The invention aims to solve the problems, analyzes the deposition characteristics of the meandering stream sedimentary sandstone reservoir in the region by introducing a concept of 'sand thickness gradient rate', perfects a sand body prediction method according to 'asymmetry of two sides of sedimentary sand bodies of a meandering stream river channel', establishes a set of meandering stream sand body scale prediction modes suitable for landforms of loess tablelands in east of the basin and south of the basin, improves the prediction precision of the block sand body scale in the region, and becomes one of powerful supports for guiding effective deployment and scale development of a gas field.
Drawings
FIG. 1 is a sample point local distribution map in the present invention;
FIG. 2 is a partial identification view of a first stage river in which a portion of the sample points of FIG. 1 are located;
FIG. 3 is a view of a full river course of FIG. 1 with the sample points in place;
FIG. 4 is a cross-sectional view of a multi-stage secondary sand body deposition on the edge beach of a meandering stream;
fig. 5 is a plan view of the meandering stream beach sand body deposit of fig. 4.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
The method is characterized in that the mountain section of a main geological target body of the Qingyang gas field is a deposition area of a Quliu river, and the following steps are adopted:
s001: selecting and sampling all the drilling wells in the meandering stream area, and counting the distance between the drilling wells and the thickness of a sand encountering body of the drilling wells;
s002: sequentially calculating sand body gradient rates of two adjacent drilling wells from west to east, analyzing the values, reflecting the deposition of the concave bank of the meandering river when the thickness of the sand body is increased and the sand body gradient rate is a positive value, and reflecting the deposition of the convex bank of the meandering river when the thickness of the sand body is reduced and the sand body gradient rate is a negative value;
s003: judging the gradient rate of the meandering river concave bank sand body and the gradient rate of the meandering river convex bank sand body according to the gradient rate of the sand body of each drilling well;
s004: respectively calculating the maximum extension distance of a concave bank of the meandering stream and the maximum extension distance of a convex bank of the meandering stream;
s005: and calculating the river channel scale according to the maximum extension distance of the concave bank of the meandering stream and the maximum extension distance of the convex bank of the meandering stream.
Example 2
S001: selecting and sampling all the drilling wells in the meandering stream area, and counting the distance between the drilling wells and the thickness of a sand encountering body of the drilling wells;
in step S001, the previous evaluation block is analyzed, and based on the standard well spacing of 0.6Km in the ancient world of Ordos basin, the well W is drilled after screening the sample points1......Wn。
Example 3
S002: and sequentially calculating the sand body gradient rate of two adjacent drilling wells from west to east, analyzing the value, reflecting the concave bank of the meandering river when the thickness of the sand body is increased, and reflecting the convex bank of the meandering river when the thickness of the sand body is reduced.
In step S002, the sand gradient KHRefers to the variation of the sand thickness per unit distance; kHThe formula is as follows: kH＝(Hwn-Hwn-1)/S；
Wherein, KHThe gradient rate of the sand body thickness is in the unit of m/km; wn is a sample point, namely completing the well drilling; hwnThe thickness of the sand body is drilled at a certain well point and the unit is m; and S is the distance between two adjacent wells.
As shown in figure 1, according to the selected well completion data, statistics of the interval between the sample points of the well and the thickness of the sand body encountered by each well drill is completed, and the sand body gradient rate K of two adjacent points is calculated from west to east in sequence according to the sand body gradient rate formulaHThe values were analyzed, and the results are shown in Table 1.
TABLE 1 actual drilling point sand thickness gradient rate
Figure BDA0002831387820000041
Example 4
In step S002, the meandering stream river channel sand body mainly erodes the side direction of the concave bank, the convex bank develops the edge beach for deposition, the deposited sand body has the two-side asymmetry characteristic, and K is arranged on one side of the concave bank of the meandering streamHGreater than 0, on the land side, KHLess than 0, namely representing a complete river course in one period, the meandering river sand body is the superposition of the multi-period river course in the lateral direction, KHThe values exhibit regular changes.
Referring to FIGS. 2 and 3, KHThe thickness of the sand body is increased to be more than 0, and the sand body can reflect a concave bank of a meandering river; kHLess than 0, the thickness of the sand body is reduced, and the curvy river convex bank can be reflected. When is composed of KH> 0 to KHWhen the thickness is less than 0, the sand body is thickened and then thinned, and the real drilling data show that the whole river course is described for one time in the process.
Example 5
In step S003, the meandering stream sand body is multi-stage riverway lateral superposition deposition, and on the basis of identifying each stage of riverway, the meandering stream concave bank deposition sand body gradient rate K in the region is determined according to the analysis of a plurality of concave bank deposition sample points of 100 Qingyang gas fields and a real drilling data big databaseH concaveBetween 8m/km and 23 m/km.
Referring to fig. 1, 4 and 5, since the deposition of the curved river valley bank beach sand body is divided into a plurality of stages, the thickness of the sand body from the first stage of the deposition of the beach sand body to the last stage of the deposition of the beach sand body becomes deeper and deeper, and the gradient rate K of the sand body is increasedHThe value of (A) is getting larger and larger, when K isHWhen the value of (A) is negative, the expression is the curvy river convex bank, when K isHWhen the value of (b) is positive again, it means that the river enters the bank of the previous stage, but is on the bank side of the meandering river as a whole. In FIG. 4, KH convex 1、KH convex 2、KH convex 3And KH convex 4Respectively refers to the sand body gradient rate of the convex bank of the meandering stream of different periods.
Determining the integral sand body thickness gradient rate K of the concave bank of the meandering river according to the deposition sample point data of more than 100 meandering rivers in the Qingyang gas field and experienceH concave≥8m/km。
Example 6
S004: respectively calculating the maximum extension distance of a concave bank of the meandering stream and the maximum extension distance of a convex bank of the meandering stream;
in step S004, K is determined according to the concave bank sediment sample points and the maximum thickness value of the actual drilling sand body of the gas field of the target areaH concaveValue according to KHFormula and KH concaveAnd calculating the maximum extension distance of the concave bank of the meandering stream in the value range.
According to actual measurement, the thickness of the meandering river sand body is 13.5m and 14m at most, namely Hwn≤14m，Hwn-1Approaching to not less than 0, and adjusting HwnOf the limit value and Hwn-1Into KH＝(Hwn-Hwn-1) S, i.e. KH concaveLess than or equal to (14m-0m)/0.6km, obtaining KH concaveThe value is less than or equal to 23m/km, and the K is determined according to the real drilling data analysisH concave∈[8，23]When, K isH concaveSubstitution into KH＝(Hwn-Hwn-1) In the/S, S is the extension distance of the concave bank of the meandering river; obtaining S ∈ [0, 1.75 ] in reverse direction]I.e. the maximum extension of the land is 1.75 km.
Example 7
In step S004, K is determined according to the convex bank deposition sample points of all periods of the target area gas fieldH convexAverage value of values according to KHFormula and KH convexAnd calculating the maximum extension distance of the convex bank of the meandering river by the average value.
As shown in figure 1, according to the actual drilling data of a plurality of meandering stream sediment sample points, the sample points cover at least two complete river channels, and according to the data pair K in the table 1H convexIs calculated as the average value of (A), KH convexHas an average value of (-0.5m/km-5.2 m/km-1.6/km)/3-2.43 m/km, and K is addedH convexAverage value and HwnSubstituting K into K at most 14mH＝(Hwn-Hwn-1) In the/S, S is the extension distance of the convex bank of the meandering river; that is, -2.43m/km is (14m-0m)/S, S is-5.76 km, and the minus sign represents the direction of the curved river land, that is, the maximum extension distance of the curved river land is 5.76 km.
Example 8
In step S005, the meandering stream channel scale is the sum of the maximum extension distance of the meandering stream concave bank and the maximum extension distance of the meandering stream convex bank, i.e. 1.75km +5.76km ≈ 7.5km, and the maximum east-west width of the meandering stream is 7.5km, and well location deployment is guided according to the maximum width of the meandering stream, so as to reduce risks.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.

Claims (8)

1. The method for predicting the scale of the curved river sandstone reservoir is characterized by comprising the following steps of:
s001: selecting and sampling all the drilling wells in the meandering stream area, and counting the distance between the drilling wells and the thickness of a sand encountering body of the drilling wells;
s002: sequentially calculating sand body gradient rates of two adjacent drilling wells from west to east, analyzing the values, reflecting the deposition of the concave bank of the meandering river when the thickness of the sand body is increased and the sand body gradient rate is a positive value, and reflecting the deposition of the convex bank of the meandering river when the thickness of the sand body is reduced and the sand body gradient rate is a negative value;
s003: judging the gradient rate of the meandering river concave bank sand body and the gradient rate of the meandering river convex bank sand body according to the gradient rate of the sand body of each drilling well;
s004: respectively calculating the maximum extension distance of a concave bank of the meandering stream and the maximum extension distance of a convex bank of the meandering stream;
s005: and calculating the river channel scale according to the maximum extension distance of the concave bank of the meandering stream and the maximum extension distance of the convex bank of the meandering stream.
2. The method for predicting the scale of the sandstone reservoir of the meandering river of claim 1, wherein in step S001, the sample point, i.e., the completed well W is screened based on the specified well spacing of 0.6Km1......Wn。
3. The method for predicting the scale of the sandstone reservoir of the meandering stream of claim 1, wherein in step S002, the gradient K of sand bodyHRefers to the variation of the sand thickness per unit distance; kHThe formula is as follows: kH＝(Hwn-Hwn-1)/S；
Wherein, KHThe gradient rate of the sand body thickness is in the unit of m/km; wn is a sample point, namely completing the well drilling; hwnThe thickness of the sand body is drilled at a certain well point and the unit is m; and S is the distance between two adjacent wells.
4. The method of predicting the scale of a sandstone reservoir of a meandering river as claimed in claim 3, wherein in step S002, the sand body of the meandering river channel is mainly eroded laterally by a concave bank, the convex bank is deposited on a developing beach, the deposited sand body has two-side asymmetric characteristics, and K is set on one side of the concave bank of the meandering riverHGreater than 0, on the land side, KHLess than 0, namely representing a complete river course in one period, the meandering river sand body is the superposition of the multi-period river course in the lateral direction, KHThe values exhibit regular changes.
5. The method for predicting the scale of the sandstone reservoir of the meandering river as claimed in claim 3, wherein in step S003, the meandering river sand is deposited in a lateral stacking manner in a multi-phase riverway, and the gradient rate K of the deposited sand in the concave bank of the meandering river in the region is determined according to a large database analysis of 100 concave bank deposition sample points in the Qingyang gas field and actual drilling data on the basis of identifying each phase riverwayH concaveBetween 8m/km and 23 m/km.
6. The method for predicting the scale of the sandstone reservoir of the meandering river according to claim 4, wherein in step S004, K is determined according to the minimum thickness of the pit bank sediment sample point and the actual drilling sand body of the gas field of the target areaH concaveValue according to KHFormula and KH concaveAnd calculating the maximum extension distance of the concave bank of the meandering stream in the value range.
7. The meandering stream sandstone reservoir of claim 4The scale prediction method is characterized in that in step S004, K is determined according to the convex bank deposition sample points of the gas field of the target areaH convexValue average according to KHFormula and KH convexAnd calculating the maximum extension distance of the convex bank of the meandering river by the average value.
8. The method for predicting the scale of the sandstone reservoir of the meandering stream as claimed in claim 5 or 6, wherein in step S005, the scale of the meandering stream channel is the sum of the maximum extension distance of the concave bank of the meandering stream and the maximum extension distance of the convex bank of the meandering stream.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104453877A (en) * 2014-11-05 2015-03-25 长江大学 Underground deep-buried meander point dam sand body historical reconstruction method
CN105607146A (en) * 2015-09-10 2016-05-25 中国海洋石油总公司 Quantitative characterization method of meandering river sand body scale
CN107918150A (en) * 2016-10-10 2018-04-17 中国石油化工股份有限公司 Based on single river recognition methods under offshore oilfield wide spacing
CN109736773A (en) * 2018-11-23 2019-05-10 中国石油天然气股份有限公司 Track tracking method for river sand horizontal well
CN111663932A (en) * 2019-03-06 2020-09-15 中国石油天然气股份有限公司 Method and apparatus for determining subsurface reservoir structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104453877A (en) * 2014-11-05 2015-03-25 长江大学 Underground deep-buried meander point dam sand body historical reconstruction method
CN105607146A (en) * 2015-09-10 2016-05-25 中国海洋石油总公司 Quantitative characterization method of meandering river sand body scale
CN107918150A (en) * 2016-10-10 2018-04-17 中国石油化工股份有限公司 Based on single river recognition methods under offshore oilfield wide spacing
CN109736773A (en) * 2018-11-23 2019-05-10 中国石油天然气股份有限公司 Track tracking method for river sand horizontal well
CN111663932A (en) * 2019-03-06 2020-09-15 中国石油天然气股份有限公司 Method and apparatus for determining subsurface reservoir structure

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