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Logging evaluation method suitable for shale gas reservoir geological model

A geological model and reservoir geology technology, applied in the field of oil and gas exploration and development, can solve the problems of no geological model, limitation of geological model establishment, and difficulty in implementing imaging logging technology to determine the structure next to the well, so as to avoid drilling risks and strengthen operability effect

Active Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] There are several difficulties in using logging technology to evaluate the geological model of shale gas reservoirs: First, shale research is a new thing, and there is no method to determine the geological model through logging technology. The existing geological model is established through field geology. The geological model is determined by investigating and relying on the profile characteristics of the geological outcrop; second, it is difficult to implement the imaging logging technology for determining the structure near the well in the horizontal logging, so that the analysis of the geological structure around the well can only be realized by the conventional logging technology in the horizontal logging , limiting the use of logging technology to study the establishment of geological models

Method used

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  • Logging evaluation method suitable for shale gas reservoir geological model
  • Logging evaluation method suitable for shale gas reservoir geological model
  • Logging evaluation method suitable for shale gas reservoir geological model

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no. 1 example

[0050] Such as figure 1 Shown is a flow chart of a method according to an embodiment of the present invention.

[0051] Such as figure 1 As shown, in step S1, by observing geological features such as various folds, fractures, and planar and linear structures in the outcrop area adjacent to the mining destination, the geological model that may be drilled is judged and the estimated geological model is established. During the actual geological survey, it was found that there are mainly two shale geological models, one is the fold model, such as figure 2 shown; one is a stable model, such as image 3 shown.

[0052] At the same time, the reservoir fracture model can also be established through the outcrop geological characteristics of the shale gas target interval. Under different formation models, the fracture patterns developed in shale gas reservoirs are also different. There are mainly two fracture patterns in shale gas reservoirs: one is a checkerboard pattern, such as...

no. 2 example

[0073] In the following, two different geological models of shale gas storage layers are analyzed as examples.

[0074] In one embodiment, the formation is taken as a fold model as an example. Such as Figure 9 Shown is the logging response characteristics of a pilot well in the study area, which is a vertical well. The shale target interval is the No. 2 interval marked on the map, and the logging response of this interval is high natural gamma ray value, low bulk density value, low neutron porosity and high acoustic time difference.

[0075] Table 1

[0076]

[0077] Figure 10 is based on Figure 9 The well logging response characteristics obtained from the horizontal well 1 designed for the confirmed target interval, which was designed to hit the No. 2 target interval. Depend on Figure 10 It can be seen that the shale in the dotted line box in the figure has similar logging response characteristics, and the neutron, density and acoustic logging curves are basicall...

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Abstract

The invention discloses a logging evaluation method suitable for a shale gas reservoir geological model, comprising following steps: building a prediction geological model and reservoir fracture pattern of a shale gas target interval area; determining a logging curve and basis for the logging curve to identify a fracture; confirming geological characteristic information of a horizontal well segment; restoring a geological model according to a variation relation between the geological characteristic information of the horizontal well segment and the horizontal well logging curve in connection with the prediction geological model; inspecting the reservoir fracture pattern and the restored geological model according to other drilling core tests near the horizontal well as well as shale gas production and testing results of a shale gas target interval. The method uses the logging information to restore the reservoir geological model, drilling risk is avoided, the accuracy for horizontal well trajectory design and target layer drilling catching is improved with cost saving; the method is applicable to shale horizontal well development and the development of other types of horizontal wells and is highly operable.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a method for identifying shale gas reservoir geological models by using well logging technology. Background technique [0002] In recent years, logging technology has been mainly used in the exploration and development of shale gas to study the properties of shale gas reservoirs, rock mechanical properties, and the development degree of shale lamination and fractures. The reservoir properties, rock mechanical properties, shale shale and fracture development degree of shale gas reservoirs are all related to the understanding of its geological model. The drilling of flat wells and the selection of favorable fracturing sections have not been reported in the literature. [0003] There are several difficulties in using logging technology to evaluate the geological model of shale gas reservoirs: First, shale research is a new thing, and there is no ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 刘双莲陆黄生张卫张元春李三国李永杰秦黎明刘江涛
Owner CHINA PETROLEUM & CHEM CORP
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