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Quantitative evaluation method for unconformity conduction capability of clastic rock

A technology for conducting quantitative evaluation, applied in earth-moving drilling, special data processing applications, instruments, etc., can solve the problem of unconformity transport ability, unconformity surface dip angle, source-reservoir distance, and lack of fluid seepage principle basis. and other issues to achieve a widely applicable effect

Inactive Publication Date: 2018-06-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

The evaluation method of single factor causes the limitations of its evaluation, so a more comprehensive analysis of the unconformity conduction capacity needs to be evaluated by integrating multiple factors
The current quantitative evaluation method not only lacks the basis of the principle of fluid seepage, but also does not consider the influence of factors such as unconformity dip angle and source-reservoir distance, and is only suitable for the evaluation of unconformity transport capacity in a local range
Although some important progress has been made in the study of unconformity conduction capacity with the efforts of domestic and foreign scholars, there is still no evaluation method that is very mature and widely applicable to various geological conditions, and is still in the exploratory stage. It is a system engineering that needs to consider various factors

Method used

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  • Quantitative evaluation method for unconformity conduction capability of clastic rock
  • Quantitative evaluation method for unconformity conduction capability of clastic rock
  • Quantitative evaluation method for unconformity conduction capability of clastic rock

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Embodiment 1

[0029] (1) Establish a conceptual model of unconformity structure and its conduction mode

[0030] On the basis of the analysis of the development process of the unconformity vertical structure, according to the field outcrop and indoor core observation in the Jixian area of ​​the Jizhong Depression in the Bohai Bay Basin, the unconformity vertical structure is divided into the upper layer of the structure (aqueous layer) from top to bottom. , the middle layer of the structure (weathered clay layer) and the lower layer of the structure (semi-weathered rock layer, also known as the weathered leaching zone). The bottom conglomerate and sand bodies of the aquigoing layer can form a "smooth-type" transport layer with high porosity and permeability, and its migration channels are mainly connected pore systems; fractures, so that the semi-weathered rock layer develops a pore-fracture system, which becomes a good channel for oil and gas migration ( figure 2 ). In the clastic rock ...

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Abstract

The invention discloses a quantitative evaluation method for unconformity conduction capability of clastic rock. According to the method, firstly, an unconformity conduction pattern concept model is constructed; secondly, an unconformity fluid migration amount mathematic model is constructed; thirdly, the unconformity fluid migration amount mathematic model is improved to obtain an improved unconformity fluid migration amount mathematic model; finally, on the basis of the improved unconformity fluid migration amount mathematic model, an unconformity conduction speed rate mathematic model is constructed to carry out quantitative evaluation on the unconformity conduction capability of the clastic rock. The method has the advantages that accurate requirements for the quantitative evaluation on the unconformity conduction capability of the clastic rock can be met, and the method can be widely applied to a geological exploration and development evaluation domain of oil and gas resources.

Description

technical field [0001] The invention belongs to the technical field of geological exploration and development evaluation of oil and gas resources, and relates to a quantitative evaluation method for the unconformity transport capacity of clastic rocks. Background technique [0002] Due to the transformation of the different properties and degrees of the earlier strata by later geological processes, the unconformity has a spatial hierarchy in the vertical direction, which is divided into water ingress layer, weathered clay layer and semi-weathered rock layer in sequence from top to bottom. A complete unconformity has two major oil and gas transport pathways separated by weathered clay layers, namely the aquiferous layer above the unconformity and the semi-weathered rock layer below the unconformity. However, as an important channel for oil and gas migration, the study on the transport capacity of unconformities lags far behind the exploration practice, which undoubtedly hinde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00E21B49/00
CPCE21B49/00G16Z99/00
Inventor 高长海查明冯建伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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