Small sand body boundary identification method and small sand body space quantitative description method

A sand body and boundary technology, applied in the field of stratigraphic division and comparison in oilfields, can solve problems such as thin thickness, difficult to describe reservoir boundaries, rapid lateral change of fluvial reservoirs, etc., and achieve the effect of improving prediction accuracy and drilling success rate

Inactive Publication Date: 2015-06-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a small sand body boundary identification method to solve the problem of rapid lateral change of fluvial reservoirs, thin thickness and scattered reservoir boundaries on the plane, which are difficult to describe

Method used

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  • Small sand body boundary identification method and small sand body space quantitative description method
  • Small sand body boundary identification method and small sand body space quantitative description method
  • Small sand body boundary identification method and small sand body space quantitative description method

Examples

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Embodiment 1

[0030] Example 1. A method for identifying the boundary of a small sand body includes the following steps:

[0031] Step 1: Starting from the regional study, relying on the sedimentary characteristics of the adjacent old area, grasp the sand body sedimentation law. Summarize the law and scale of sand body development. Figure 1a to Figure 1d The development model diagrams of different sedimentary microfacies sand bodies are shown. Such as Figure 1a As shown, the low-curved riverside beach develops a narrow band of thick sand; the thick sand is 6-12 meters in thickness and 100-500 meters in width on the low-curved riverside beach, and the length of single sand varies. Such as Figure 1b As shown, the high-curved riverside beach develops a wide band-shaped sand body; it extends mostly 1-3 kilometers, and the width is generally 500-800 meters. It is medium-thick sand with a thickness of 4-8 meters. Such as Figure 1c As shown, the natural dike develops a thinner potato sand body;...

Embodiment 2

[0040] Example 2. A method for spatial quantitative description of small sand bodies, which is characterized in that it comprises the following steps:

[0041] Step 1: Use the small sand body boundary identification method described in Example 1 to describe the sand body boundary and determine the favorable reservoir zone;

[0042] Step 2: Perform a quantitative description of the spatial shape of the sand body through well logging constraint inversion.

[0043] In this embodiment, under the guidance of the study of reservoir deposition law, comprehensive application of seismic event axis tracking, multiwavelet decomposition waveform component analysis, frequency-divided seismic attribute analysis and other technologies are used to determine favorable reservoir zones and describe sand body boundaries. On this basis, through the method of logging constraint inversion, the thickness of the sand body is described in detail, and the spatial shape of the sand body is quantitatively descr...

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Abstract

The invention discloses a small sand body boundary identification method and a small sand body space quantitative description method. The small sand body boundary identification method comprises the following steps: summarizing the development rules and scale of a sand body according to the geological situation of a region; summarizing the seismic response characteristics of a reservoir and carrying out seismic profile identification and interpretation through seismic forward modeling; processing earthquake in a frequency division way, extracting seismic attributes of different frequency bands, and adopting known well data analysis to preferably select seismic attributes better corresponding to the reservoir and the sand body; and finely describing the sand body by comprehensively adopting the geological rules, sand body seismic response characteristics and frequency-division seismic attribute analysis. The small sand body space quantitative description method comprises the steps of drawing the boundary of a sand body and determining a favorable area of a reservoir by the above method, and quantitatively describing the spatial shape of the sand body through well logging constrained inversion. The boundary of a described small sand body is accurate and quick to describe, and the accuracy of reservoir predication can be improved.

Description

Technical field [0001] The invention relates to the technical field of strata division and comparison of oil fields, in particular a method for identifying the boundary of a small sand body and a method for quantitatively describing the space of a small sand body. Background technique [0002] With the increase in the difficulty of onshore exploration and the reduction of large-scale reserves, the beach and shallow waters have become the main battlefield for oilfields to increase reserves and production. Take this shallow oil reservoir in Shengli Oilfield as an example. It belongs to meandering river sedimentation. The reservoir has poor lateral continuity. The main characteristics of reservoir development are: (1) Vertically, the reservoir is thin, single oil layer, and poorly developed. Layer prediction is difficult; (2) On the plane, the reservoir changes quickly, has poor continuity, and overlaps, making it difficult to portray boundaries. For this kind of small and scattere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 隋淑玲田同辉张强杜玉山许彦群赵翠霞翟亮常涧峰滕宝刚晁静
Owner CHINA PETROLEUM & CHEM CORP
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