River facies deposition dispersed oil sand body identification and exploitation method and application thereof

Abstract

The invention discloses a river facies deposition dispersed oil sand body identification and exploitation method and application thereof, and belongs to the technical field of oil and gas field development. The method comprises the steps of: determining a river facies deposition area based on logging information and seismic data of a drilled well; according to the river facies deposition area, determining the spatial distribution pattern of river facies deposition sand bodies; and determining the distribution of the river facies deposition oil sand bodies according to the spatial distributionpattern of the river facies deposition oil sand bodies; and according to the distribution of the river facies deposition oil sand bodies, adopting a horizontal well exploitation mode, and connecting the river facies deposition oil sand bodies in series for exploitation. According to the method, the dispersed oil sand bodies deposited by the river facies are identified based on the logging information and the seismic data, and then a horizontal well exploitation is adopted, the oil sand bodies with large volume, high reserve and close distance are connected in series along the riverway to be exploited by adopting a horizontal well exploitation mode, so that the exploitation cost can be reduced, the oil well control reserves is increased, and the oilfield development benefits are improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for identifying and exploiting dispersed oil sand bodies in fluvial facies deposits, and an application thereof. Background technique [0002] In onshore oilfields, the oil reserves of fluvial deposits account for more than 70% of the total geological reserves, and are the main reservoirs for oilfield development. Fluvial sedimentary reservoirs have the characteristics of small sand bodies, thin thickness, and low reserves of a single sand body. Therefore, the economic benefit of independent mining of a single sand body is not good, and combined mining is required. [0003] In related technologies, vertical wells are usually used to exploit vertical wells for fluvial facies deposits of different strata, which can be superimposed vertically. Due to the small volume of sand bodies and thin oil layers, vertical wells have a small drainage surface, low ...

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Problems solved by technology

Fluvial sedimentary reservoirs have the characteristics of small sand bodies, thin thickness, and low reserves of a single sand body. Therefore, the economic benefit of independent mining of a single sand body is not good, and combined mining is required

[0003] In related technologies, vertical wells are usually used to exploit vertical wells for fluvial deposits of different strata that can be superimposed vertically. Due to the small volume of sand bodies and thin oil layers, vertical wells have a small drainage surface, low recovery degree, and poor profitability. ;For the fluvial facies deposits of different strata, the oil sand body with displacement in the vertical direction is usually exploited by deviated wells, and the effect is similar to that of vertical wells

[0004] However, for the small oil-sand bodies that do not overlap vertically but are scattered in many planes, it is difficult to obtain economic benefits for both vertical well mining and deviated well mining

Therefore, many small oil sand bodies have been idle for a long time and cannot be utilized, thus reducing the controlled reserves of oil wells and the benefits of oilfield development

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