Meander river sand body reservoir building structure analysis method based on evolution process

Abstract

The invention discloses a meander river sand body reservoir building structure analysis method based on the evolution process. The meander river sand body reservoir building structure analysis method includes the following steps that firstly, the river evolution process is restored, a building structure and distribution characteristics of a river sand body are rebuilt, and determination of a single river channel, analysis of the river channel evolution direction and recognition of a meander bar are conducted; distribution and evolution characteristics of lateral accretion bodies and lateral accretion interlayers inside the meander bar are analyzed, a fine reservoir internal building structure is built, and discrimination of the direction of the lateral accretion bodies in the meander bar and the inclination direction of the lateral accretion interlayers, judgment of the dip angles of the lateral accretion interlayers in the meander bar and acquisition of vertical interlayer intervals and plane development intervals of the lateral accretion interlayers inside the meander bar are conducted. The method has the advantages that the internal structure of the sand body is accurately analyzed, and the matching degree of an analysis result and real evolution is increased, and can be widely applied to the technical field of exploration and development of oil and gas.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method for analyzing the building structure of meandering river sand body reservoirs based on evolution process. Background technique [0002] With the needs of oilfield development, more and more geological experts have begun to re-emphasize the control effect of the internal structure of single sand body on reservoir heterogeneity, seepage field, injectant displacement effect and remaining oil formation and distribution. There are widely distributed meandering river and meandering delta reservoirs in the main intervals of some oilfields in China, and their internal structure characteristics have become the main factors controlling the distribution of remaining oil. As early as the 1980s, the older generation of geologists realized the impact of different reservoir structure characteristics on exploration and development, and discussed the devel...

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Problems solved by technology

However, in the characterization of the internal structure of the reservoir, the plane distribution of sand bodies is often emphasized, and the characteristics of individual sand bodies are more considered. The sand body combination relationship is rarely analyzed from the sedimentary evolution process, which makes it impossible to match the anatomical results with the real evolution process. Completely matching, no reasonable explanation can be obtained for the formation process of the sand body, which indicates that the ...

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