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A Dissolution Pore Identification Method for Unconventional Reservoirs with Low Porosity and Ultra-Low Permeability

An identification method and a technology of dissolution pores, which are applied in the fields of petroleum exploration and development, can solve the problems of high cost, low accuracy of identification of dissolution pores reservoirs, and difficulty in popularization, etc.

Active Publication Date: 2021-04-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for identifying dissolution pores in unconventional reservoirs with low porosity and ultra-low permeability in view of the defects of low accuracy, high cost and difficulty in popularization in the prior art for identifying dissolution pores in reservoirs

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  • A Dissolution Pore Identification Method for Unconventional Reservoirs with Low Porosity and Ultra-Low Permeability
  • A Dissolution Pore Identification Method for Unconventional Reservoirs with Low Porosity and Ultra-Low Permeability
  • A Dissolution Pore Identification Method for Unconventional Reservoirs with Low Porosity and Ultra-Low Permeability

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Embodiment Construction

[0038] The present invention will be further described in detail through the case of identification of dissolution pores of unconventional reservoirs in the second member of Bajie, X6-1 well, X6 block, Chagan sag, in conjunction with the accompanying drawings.

[0039] Depend on figure 1 As can be seen, the concrete steps of the present invention include:

[0040] 1. Based on the core physical property analysis data of the unconventional reservoir coring section of the Ba2 member of the X6 block, the corresponding relationship between the unconventional reservoir dissolution pore development section and the porosity and permeability is established.

[0041] 1.1 According to the core observation of the unconventional reservoir core section of the Ba2 Member of Block X6, it is clear that the 3, 5, and 6 sand groups of the Ba2 Member of the X6 block are unconventional reservoirs with developed dissolution pores.

[0042] 1.2 According to the above step 1.1, the unconventional re...

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Abstract

The invention relates to a method for identifying dissolution pores of unconventional reservoirs with low porosity and ultra-low permeability, which belongs to the field of petroleum exploration and development. Corresponding relationship between developed intervals, porosity and permeability, determination of logging curve response characteristics of unconventional reservoir coring intervals in unconventional reservoirs in the target area, establishment of porosity interpretation model for dissolution pores in unconventional reservoirs in the target area, Identification and evaluation of dissolution pores in unconventional reservoirs in this area. The method for identifying dissolution pores in unconventional reservoirs established based on core data and well logging data in the present invention not only has a good identification and evaluation of dissolution pores in sandstone reservoirs, but also can identify and evaluate dissolution pores in carbonate rock reservoirs, igneous rock reservoirs and shale reservoirs. The dissolution pores in the reservoir also have a good identification and evaluation effect, and the cost is low, easy to popularize, and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, and in particular relates to a method for identifying dissolution pores of unconventional reservoirs with low porosity and ultra-low permeability. Background technique [0002] Dissolution pores are often encountered in low-porosity and ultra-low-permeability unconventional reservoirs in reservoir evaluation, which is the result of dissolution in a slightly alkaline diagenetic environment due to the high content of carbonate cement in such reservoirs . The existence of dissolution pores significantly improves the physical properties of this type of reservoir, and the higher the proportion of dissolution pores, the better the physical properties. After oil testing in reservoirs with well-developed dissolution pores, higher oil flow can be obtained, indicating that the dissolution pores are well developed. The belt is a favorable condition for oil and gas accumulation in unconv...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 杨建成陈彬苏惠赵其磊翟芳芳杨丽英蔡军星于春华
Owner CHINA PETROLEUM & CHEM CORP
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