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Tight oil dessert reservoir identification method

An identification method and tight oil technology, applied in the field of oil and gas exploration, can solve the problems of large scale of fracturing, high cost of exploration and development, failure to achieve expected production capacity, etc., and achieve the goal of increasing single well production capacity, reducing fracturing scale, and reducing costs Effect

Pending Publication Date: 2019-10-15
CNPC XIBU DRILLING ENG +1
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Problems solved by technology

[0005] The present invention provides a method for identifying tight oil sweet spot reservoirs, which overcomes the deficiencies of the above-mentioned prior art, and can effectively solve the problem of insufficient understanding of reservoirs, large scale of fracturing reconstruction, high cost of exploration and development in the prior art. The problem of not being able to meet the expected production capacity

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  • Tight oil dessert reservoir identification method
  • Tight oil dessert reservoir identification method
  • Tight oil dessert reservoir identification method

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Embodiment 1

[0026] Embodiment 1: as attached figure 1 As shown, the identification method of the tight oil sweetspot reservoir includes the following steps:

[0027] In the first step, according to the measured logging data of different lithologies at different depths, the true resistivity Rt reflecting the electrical characteristics and the logging effective porosity φ reflecting the fracture characteristics corresponding to the different lithologies of each well are selected to establish Resistivity-effective porosity lithology identification chart for rapid identification of dominant lithofacies carbonate rocks;

[0028] The above-mentioned logging data include data such as well depth, lithology, true resistivity and logging effective porosity.

[0029] The second step is to perform dimensionless processing on the logging data for comparative analysis of sensitive parameters highly correlated with productivity. The dimensionless formula is:

[0030]

[0031] In the formula: Y i (...

Embodiment 2

[0042] Embodiment 2: as figure 2 , 3 As shown in , 4, it is applicable to the identification method of tight oil sweet spot reservoirs in the Permian Lucaogou Formation in the Jimsar Sag of the Junggar Basin. A large amount of recorded and measured data of the Lucaogou Formation tight oil is sorted out, and the statistics of different lithologies in each well are collected. Corresponding values ​​of true resistivity Rt (reflecting electrical characteristics) and logging effective porosity φ (reflecting fracture characteristics) (Table 1): The charts of resistivity and effective porosity established by statistical data can effectively identify mudstone and white cloud mudstone, silty fine sandstone and carbonate rocks, among which the true resistivity of carbonate rocks is greater than 30Ωm, and the porosity is greater than 2.3% ( figure 1 ).

[0043] The original data in Table 1 are dimensionless, and the formula is:

[0044]

[0045] In the formula: Y i (k) is the dat...

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Abstract

The invention relates to the technical field of oil and gas exploration, in particular to a tight oil dessert reservoir identification method, which comprises the steps: 1, establishing a resistivity-effective porosity lithology identification plate; 2, carrying out dimensionless processing on the logging data; 3, analyzing the dimensionless sensitive parameters by adopting a grey correlation analysis method to obtain the priority and the influence degree of each logging sensitive parameter; fourthly, for the wells with the fracturing scale and the fracturing technology similar to those selected in the first step, the new wells to be developed being subjected to productivity high-low classification; and 5, for the reservoirs corresponding to the selected high-productivity wells and low-productivity wells, analyzing respective corresponding logging response characteristics for guiding and determining productivity sensitive parameters which influence the maximum productivity of the target block. The method provides a basis for new well oil testing-fracturing layer selection, enlarges the transformation scale of a high-quality reservoir, reduces the fracturing scale of a medium-poor-quality reservoir, and has important significance for improving the single well productivity and reducing the cost.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, and relates to a method for identifying tight oil sweet spot reservoirs. Background technique [0002] The “sweet spot” of tight oil refers to the reservoir section with relatively good physical properties and good oil-bearing property under the background of relatively low porosity and low permeability. In recent years, my country's exploration work has made important breakthroughs, and many wells have obtained industrial oil flow. The evaluation and selection of "sweet spots" is the core of tight oil exploration, which runs through the entire exploration process. [0003] The tight oil reservoirs of the Permian Lucaogou Formation in the Jimsar Sag in the eastern Junggar Basin, my country have complex lithology and various types, and the clastic particle size in the rocks is generally fine, and there are many enriched layers of fine sandstone, mudstone and carbonate rock distribu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/06E21B49/00
CPCG06Q50/06E21B49/00G06F30/20
Inventor 封猛肖辉胡广文丁心鲁刘钰王金礼周超张晓文韦钦杰王立新徐伟红刘慧杜宗和李轶高亮
Owner CNPC XIBU DRILLING ENG
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