A mapping method for fine characterization of sedimentary facies

Abstract

The invention discloses a mapping method for a sedimentary facies meticulous depiction. The mapping method comprises the following steps that a coarse sedimentary facies plan is formed on a seismic profile to extract seismic attributes according to a seismic reflection axis for a target reservoirstratum; each sedimentary stage is identified according to sedimentary characteristics and logging morphologies at a well point, and the ratio of the each sedimentary stage to actual drilling is calculated throughthe sedimentary characteristics and the logging morphologies; the ratio of the plane thickness of the each sedimentary stage is obtained by an interpolation amongwells of the target reservoir stratum using the ratio of the actual drilling, the seismic axis is split, the seismic attributesare extracted, and the division of the coarse sedimentary facies plan on the vertical reservoir stratum is achieved according to the ratio of the each sedimentary stage; and the seismic attributes ofthe each sedimentary stageare extracted from the distribution status on the profile and on a plane,sedimentary facies of each seismic attribute are depicted, a plurality ofthe sedimentary facies are carved out, and the subdivision map of the sedimentary facies is obtained. The mapping method for the sedimentary facies meticulous depiction is the sedimentary facies meticulous depiction with the sparse well pattern density and the lower seismic resolution, and can be applied tothe oil field of exploration and development.

Description

technical field [0001] The invention relates to a mapping method for finely depicting sedimentary facies, belonging to the field of oil and gas exploitation. Background technique [0002] A fine sedimentary facies plan is an important basis for oilfield production planning, dynamic analysis and adjustment of the development process. Due to the cyclic nature of the sedimentary body, the lateral phase change of the sedimentary facies belt is large and the internal structure is complex, which inevitably requires the fine characterization of the sedimentary facies from the vertical and plane, so as to accurately improve the well location deployment and deep excavation of the remaining Oil and avoid problems such as rising water content. At present, the description of fine sedimentary facies is mainly based on 3D seismic information and well information. However, due to the limitation of seismic data resolution and the diachronism of lithological interface, the traditional seis...

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Problems solved by technology

However, due to the restriction of seismic data resolution and the diachronism of lithological interfaces, the traditional seismic facies analysis method cannot meet the needs of fine interpretation of reservoir internal structure in reservoir development geological research.

For the sedimentary facies characterization of well information, multi-well information is used to compile sedimentary facies maps. This method cannot realize the prediction of sand bodies between well locations, and can only use interpolation, which cannot accurately predict the spatial distribution and scale of reservoirs. Meet the needs of remaining oil potential tapping and well location deployment in the middle and later stages of oilfield development

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