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High-precision tectonic stress field simulation method for turbidite sand low-permeability reservoirs

A low-permeability reservoir and simulation method technology, applied in the field of high-precision tectonic stress field simulation, can solve the problems of not meeting the needs of oilfield development, low precision and accuracy, etc., and achieve the effect of improving development effects and increasing oilfield development benefits

Inactive Publication Date: 2016-09-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing tectonic stress field simulation method is low in precision and accuracy when used in turbidite sand low-permeability reservoirs and cannot meet the needs of oilfield development, and provides a method suitable for turbidite sand low-permeability reservoirs. High-precision tectonic stress field simulation method for layers

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  • High-precision tectonic stress field simulation method for turbidite sand low-permeability reservoirs
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  • High-precision tectonic stress field simulation method for turbidite sand low-permeability reservoirs

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specific Embodiment approach 1

[0031] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the high-precision tectonic stress field simulation method applicable to turbidite sand low-permeability reservoir described in this embodiment, it comprises the following steps:

[0032] Step 1: Establish turbidite sand reservoir structure model, turbidite sand reservoir sedimentary microfacies model and turbidite sand reservoir velocity model in PETREL system in sequence;

[0033] Step 2: According to the conversion relationship between the compressional and shear wave velocity, the conversion relationship between the compressional and shear wave velocity and dynamic rock mechanics parameters, and the conversion relationship between dynamic and static rock mechanics parameters, the three-dimensional rock mechanics parameter model is obtained by calculating the velocity model of the turbidite sand reservoir;

[0034] Step 3: Convert the turbidite sand reservoir structural mod...

specific Embodiment approach 2

[0039] Specific implementation mode two: this implementation mode will further explain the first implementation mode. In step one of the first implementation mode, the turbidite sand reservoir structure model, the turbidite sand reservoir sedimentary microfacies model and the turbidite sand reservoir are sequentially established in the PETREL system. The specific method of the reservoir layer velocity model is as follows:

[0040] The turbidite sand reservoir structure model includes 4 layer models and 4 fault models. It is a north-dipping monoclinic structure with complex faults, and its thickness varies greatly. Due to the east-west compression, four normal faults near east-west direction are developed, with fault throws ranging from 10m to 180m.

[0041] The sedimentary microfacies model of the turbidite sand reservoir is established on the basis of the structural model, combined with the division of single well sedimentary microfacies and planar sedimentary microfacies dat...

specific Embodiment approach 3

[0043] Embodiment 3: This embodiment further explains Embodiment 2. In Step 2 of this embodiment, according to the conversion relationship between the longitudinal and transverse wave velocity, the conversion relationship between the longitudinal and transverse wave velocity and dynamic rock mechanics parameters, and the conversion relationship between dynamic and static rock mechanics parameters , the specific method to obtain the three-dimensional rock mechanics parameter model by calculating the velocity model of the turbidite sand reservoir is as follows:

[0044] The conversion relationship between the longitudinal and shear waves can be regressed and fitted according to the shear wave velocity obtained from the core test in the research area and the acoustic logging layer velocity. The specific conversion relationship is as follows:

[0045] V p =1.6117V s +0.3503

[0046] In the formula, V p is the longitudinal wave velocity, V s is the transverse wave velocity,

[0...

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Abstract

The invention provides a high-precision tectonic stress field simulation method applicable to turbidite sand low-permeability reservoirs and belongs to the field of tectonic stress field simulation technologies. The high-precision tectonic stress field simulation method aims at solving the problems that the high-precision simulation can not be carried out on the turbidite sand low-permeability reservoirs to direct well network deployment in the oilfield development process and improve the development effect of the low-permeability reservoirs through an existing tectonic stress field simulation method. The method includes the first step of establishing a turbidite sand reservoir tectonic model and a turbidite sand reservoir interval velocity model in a PETREL system, the second step of obtaining a three-dimensional rock mechanics parameter model through calculation on the turbidite sand reservoir interval velocity model, the third step of converting the turbidite sand reservoir tectonic model in the PETREL system to a turbidite sand reservoir geometric model in an ANSYS system, the fourth step of carrying out independent mesh subdivision on a stratum and a geologic fault; the fifth step of loading rock mechanics parameters through a range scanning mode, and the sixth step of carrying out simulation on a tectonic stress field to obtain stress distribution states of any point in the turbidite sand low-permeability reservoirs. The method is used for simulating the tectonic stress field in the turbidite sand low-permeability reservoirs.

Description

technical field [0001] The invention relates to a high-precision structural stress field simulation method suitable for low-permeability reservoirs, and belongs to the technical field of structural stress field simulation. Background technique [0002] Turbidite sand low-permeability reservoir is an important reservoir type. Due to its complex structure and strong heterogeneity, the conventional tectonic stress field simulation method has a low degree of fitting between the geometric model and the reservoir structure. A single rock mechanical parameter is not enough to reflect its heterogeneity, which seriously restricts the improvement of the simulation accuracy of the tectonic stress field in low-permeability turbidite reservoirs. Improving the simulation accuracy of tectonic stress field in low-permeability turbidite sand reservoirs is of great significance for rationally adjusting the deployment of development well patterns for low-permeability turbidite sand reservoirs,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 王伟锋朱传华李玉坤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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