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Low-hole extra-low-permeability unconventional reservoir dissolution hole identification method

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

Active Publication Date: 2016-01-13
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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  • Low-hole extra-low-permeability unconventional reservoir dissolution hole identification method
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  • Low-hole extra-low-permeability unconventional reservoir dissolution hole identification method

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Embodiment Construction

[0038] The present invention will be further described in detail through the case of identification of dissolution pores in unconventional reservoirs in the second member of Bajie Formation, X6-1 well, X6-1 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 in Block X6, it is clear that the 3, 5 and 6 sand formations of the Ba2 Member in Block X6 are unconventional reservoirs with developed dissolution pores.

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

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Abstract

The invention relates to a low-hole extra-low-permeability unconventional reservoir dissolution hole identification method, and belongs to the field of petroleum exploration and development; and according to the core physical property analysis data of the target area unconventional reservoir cored interval, the corresponding relation of the unconventional reservoir dissolution hole development section to the porosity and the permeability is built, the well log response characteristics of the target area unconventional reservoir cored interval dissolution hole development section are determined, the porosity explanation model of the target area unconventional reservoir dissolution hole is built, and the target area unconventional reservoir dissolution hole is identified and evaluated. The unconventional reservoir dissolution hole identification method, built based on the core data and the log data, preferably evaluates the sandstone reservoir dissolution hole, is better in identifying and evaluating effect on dissolution holes of a carbonate reservoir, an igneous rock reservoir and a shale reservoir, and is low in cost, easy to be promoted and wide in application prospect.

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...

Claims

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Application Information

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Patent Type & Authority Applications(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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