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A sealing evaluation method for porous sandstone fault zone

An evaluation method and fault zone technology, which is applied in the field of research on the mechanism of faults controlling reservoirs, to achieve a simple and reliable evaluation method

Active Publication Date: 2019-12-20
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this stage, the fluid potential theory is widely used in the field of oil and gas accumulation, but the research on the fluid potential inside the fault zone is still in the exploratory stage, and how to use the fluid potential difference to evaluate the sealability of the fault zone needs to be further studied

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  • A sealing evaluation method for porous sandstone fault zone
  • A sealing evaluation method for porous sandstone fault zone
  • A sealing evaluation method for porous sandstone fault zone

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] The present invention firstly introduces the mechanism of lateral sealing of oil and gas by the fault zone.

[0031] From the perspective of oil and gas accumulation, the migration of fluid during the fault active period is fast, and it can be considered to be instantaneous on the time scale of geological history; while the time of the fault activity-interval period and the fault quiescence period is much longer. It is longer than the fault active period, so for hydrocarbon accumulation, the fault active period-intermittent period and the fault static period have more important significance for hydrocarbon migration and accumulation and preservation. The main driving force of the fluid during the fault activity-intermittent period and the fault static period is buoyancy. The fault zone and the reservoirs on both sides of the fault are considere...

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Abstract

The invention relates to a method for evaluating the sealing property of a porous sandstone fracture zone. The method is characterized by comprising the following steps of 1) analyzing the reservoir fluid potential on both sides of the porous sandstone fracture zone to determine an expression of the reservoir fluid potential on both sides of the fracture zone; 2) analyzing the fluid potential of aporous sandstone fracture core to determine an expression of the fluid potential of the fracture core; 3) conducting comparison analysis on the expression of the reservoir fluid potential on both sides of the fracture zone and the expression of the fluid potential of the fracture core to determine an expression of a difference between the reservoir fluid potential of the fracture core and the reservoir fluid potential on both sides of the fracture zone; 4) calculating the expression of the difference between the reservoir fluid potential of the fracture core and the reservoir fluid potentialon both sides of the fracture zone, and evaluating the sealing property of the fracture zone according to an obtained difference value. The method can be widely applied to the field of fracture-zone sealing property evaluation and fracture reservoir-controlling mechanism research.

Description

technical field [0001] The invention relates to a method for evaluating the sealing performance of a porous sandstone fault zone, which belongs to the field of research on mechanisms of faults controlling reservoirs. Background technique [0002] Faults are three-dimensional geological bodies composed of complex internal structures, which play an important role in oil and gas migration, accumulation, and accumulation. This role is mainly reflected in two aspects: channeling and sealing. The key to guiding and sealing ability. According to the research results at home and abroad and the characteristics of the surrounding rock deformation zone under the microscope, it can be seen that the fracture is not a simple two-dimensional surface, but a three-dimensional geological body with a complex internal structure. According to the difference in internal structure, the fault zone can be divided into two parts: the fault core and the fracture zone. The fault core is composed of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 孙盼科徐怀民徐朝晖雷志诚
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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