Quantitative evaluation method for unconformity conduction capability of clastic rock

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...

AI Technical Summary

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

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