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Method for predicting mudstone crack by structure causes

A technology for fracture prediction and structure, which is applied in the directions of surveying, earthwork drilling, and mining fluids, etc. It can solve the problems of high cost, long research period, and large influence of seismic data noise, and achieves short research period, low cost, and effective technical means Effect

Inactive Publication Date: 2015-02-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for predicting mudstone cracks due to structural causes, aiming at the existing methods, which are greatly affected by seismic data noise, long research period, and high cost.

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  • Method for predicting mudstone crack by structure causes
  • Method for predicting mudstone crack by structure causes
  • Method for predicting mudstone crack by structure causes

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Embodiment Construction

[0023] Below in conjunction with the prediction example and accompanying drawings of mudstone fractures in Liutun sub-sag, Dongpu Sag, Shasan Shang 10 Sand Formation, the embodiment of the present invention will be further described in detail. figure 1 As can be seen, the concrete steps of the present invention are as follows:

[0024] 1. Collect attached figure 2 The analysis and test data of the work area to be predicted and the attached image 3 The drilling and logging data of 9 wells including ps18, ps18-1, ps18-2, ps18-8, w218, w408, w120, w39 and w21 were collected, and the seismic interpretation database of this area was established.

[0025] 2. Classification of mudstone fractures: The mudstone fractures were identified by using the drilling data and logging data of the above 9 wells in the Shasan Shang 10 sand formation in the Liutun sub-sag of the Dongpu Sag, and the mudstone fractures were evaluated and classified into 2 grades. Among them, those with more than ...

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Abstract

The invention relates to a method for predicting a mudstone crack by structure causes and belongs to the technical field of petroleum exploration and development. The method comprises the following steps: (1) carrying out evaluation and classification on the mudstone crack; (2) determining a range to be predicted of the mudstone crack; (3) obtaining conventional geological structure data of a target layer in a region to be predicted; (4) making a local structure deformation graph of the region to be predicted; (5) establishing a relation between the local structure deformation graph and the mudstone crack; (6) determining a developing range of the mudstone crack. According to the invention, the conventional geological structure is decomposed into a regional structure background, local structure deformation and a random factor, the random factor is eliminated by replacing the regional structure background with a trend surface and adopting a filtering method and micro curvature change generated by the local structure deformation is stressed so as to predict the development range of the mudstone crack caused by structure stress variation; and the method provides a rapid, convenient and efficient technical means for exploration and development of a mudstone crack petroleum reservoir is provided, the prediction coincidence rate is high, the research period is short, and the cost is low.

Description

technical field [0001] The invention relates to a mudstone crack prediction method of structural origin, belonging to the technical field of petroleum exploration and development. Background technique [0002] In recent years, a large number of fractured mudstone reservoirs have been discovered at home and abroad, indicating that fractured mudstone reservoirs have gradually become an important new field of oil and gas exploration and development. A large number of fractures in mudstone formations not only provide effective storage space for oil and gas occurrence, but also improve formation permeability. The development degree and distribution range of mudstone fractures are important indicators for the exploration and development of this type of oil and gas reservoirs. How to predict mudstone fractures based on known data is of great significance to the exploration and development deployment of mudstone fractured oil and gas reservoirs. [0003] At present, the existing fr...

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Application Information

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IPC IPC(8): E21B49/00E21B47/00E21B43/26
CPCE21B43/26E21B47/00E21B49/00
Inventor 梁国胜苏惠张宝君付明世刘亚洲谢敏孙力单献国刘淑
Owner CHINA PETROLEUM & CHEM CORP
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