Method for interpreting seismic horizon to sedimentary unit in dense well network area

A technique for sedimentary units and seismic layers, which is applied in seismology, seismology, seismic signal processing, etc. for well logging records. It can solve the problems of sedimentary unit reservoir prediction, low efficiency, inability to obtain seismic data, and heavy horizon calibration workload. and other issues to achieve the effect of improving work efficiency and reducing labor intensity

Pending Publication Date: 2020-07-14

DAQING OILFIELD CO LTD +1

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Problems solved by technology

[0006] The present invention aims to overcome the problem that the existing seismic geological horizon calibration method in the background technology has a large workload and low efficiency o...

Abstract

The invention relates to a method for interpreting a seismic horizon to a sedimentary unit in a dense well network area. The problems that an existing seismic geological horizon calibration method islarge in horizon calibration workload and low in efficiency, and seismic data cannot conduct reservoir prediction on a sedimentary unit are solved. The method comprises the following steps of 1) acquiring data: acquiring a three-dimensional seismic data volume acquired outdoors and well point depth domain hierarchical data measured by using a logging instrument, 2) performing three-dimensional seismic data volume oil layer group level isochronous stratigraphic framework interpretation by applying an artificial interpretation method, 3) secondly, interpreting a sedimentary unit-level isochronous stratigraphic framework of the seismic data volume, and 4) finally, under the control of the seismic data volume sedimentary unit-level isochronous stratigraphic framework, effectively extracting the seismic attribute reservoir prediction result of each sedimentary unit. According to the method, the time domain isochronous stratigraphic framework is established by tracking the seismic horizon ofthe top and the bottom of the oil layer group, so that the reservoir prediction work of seismic data on each sedimentary unit is realized.

Application Domain

Seismic signal processingSeismology for water-logging

Technology Topic

Earth quakeAssise +4

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Experimental program(1)

Example Embodiment

[0034] Example 1

[0035] Taking the isochronous frameworks PI and GI of the oil layer group level in the BRX block of Changyuan Oilfield as an example, the method of the present invention to interpret the seismic horizon to the sedimentary unit in the dense well pattern area is explained in detail.

[0036] like figure 2 As shown in the figure, taking 10 wells in the work area as an example, 4 wells with sound wave and density can do synthetic recording; the other 6 wells have no sound wave and density curve, so synthetic recording cannot be done.

[0037] 1. With reference to the time-domain data of 4 wells in the synthetic record (Table 1 shows the layered data at the oil layer group level), the seismic reflection events corresponding to PI and GI on the top surface of the oil layer group can be tracked in the whole area (such as image 3 shown), under its control, the reservoir group time values of the other 6 wells can be read out on the seismic section.

[0038] The overall formation thickness of PI and GI (PI top to GI top) is close to 60m, and 15 sedimentary units can be refined. The thickness of each sedimentary unit is within 3-7m, and the average thickness is 4m. The depth of each well in the work area is used. Domain layered data, the time domain layered data of each deposition unit can be calculated according to the above formula. The specific methods are as follows:

[0039] Taking the third depositional unit as an example, the depth domain data of each well can be read out by logging layering (Table 2 is the layered data at the depositional unit level). t3)? Taking Well 4 as an example, use the above formula to calculate

[0040] (1) The value of Tm can be read as 764.8ms in Table 1, and the value of Tm-1 is 724.3ms;

[0041] (2) The value of hi is the unit depth value of Well 4 in Table 2 (1012.1m) minus the value of the PI depth domain of Well 4 in Table 1 (1000m), and the value of hi can be obtained as 12.1m;

[0042](3) The value of Hj is the value of the GI depth domain of the reservoir group corresponding to Well 4 in Table 1 (1060.3m) minus the value of the PI depth domain of the reservoir group (1000m), and the value of Hj can be obtained as 60.3m;

[0043] (4) Bring the value into the formula to get the t of well 4 3 The value is 732.4

[0044]

[0045] (5) Using the same method, the t3 values of other wells can be obtained (see Table 2).

[0046] 3. According to the layered data in the t3 time domain of each well, the sedimentary unit can be traced on the seismic section (see Figure 4 ), the same principle can track the temporal layering of the other 14 depositional units, (see Figure 5 ).

[0047] 4. Inspection of the accuracy of the research results: According to the framework of each sedimentary unit, the seismic attributes can be effectively extracted for reservoir prediction, Image 6 The prediction results of medium seismic attributes and the facies zone diagram based on well cognition ( Figure 7 ), with a high degree of similarity, indicating that the interpretation accuracy of the seismic profile at the depositional unit level is very high, which can meet the requirements of oilfield reservoir prediction.

[0048] Table 1

[0049]

[0050] Table 2

[0051]

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Classification and recommendation of technical efficacy words

Improve work efficiency
Reduce manual labor intensity

Method for interpreting seismic horizon to sedimentary unit in dense well network area

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Description & Claims & Application Information

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