Self-adaptive multidirectional coherent fusion method

Abstract

The invention discloses a self-adaptive multidirectional coherent fusion method which comprises the following steps of firstly, solving variances or coherent bodies in different directions according to an existing discontinuity solving method, and selecting a quick and easy-to-implement similarity algorithm to obtain the coherent bodies in order to conveniently illustrate the technology. Due to the fact that discontinuous geologic features, such as similar faults, etc., have directionality, coherence bodies obtained through calculation from different directions have great differences in fault depiction clarity. Different coherent bodies are constructed into a structure tensor matrix, elements in the matrix are smoothed, then corresponding characteristic values are solved, and finally, coherent values are constructed by utilizing the characteristic values, namely the coherent values are final fusion coherence. According to the method, the depiction advantages of different coherent bodies on discontinuous geologic features in different directions are fused, the defect that effective information cannot be fully extracted through traditional coherence is overcome, the depiction ability and application efficiency of the coherent bodies are improved, and a reliable means is provided for understanding underground structures and sedimentary features.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to an adaptive multi-azimuth coherent fusion method. Background technique [0002] The Bohai Bay Basin is affected by multi-stage tectonic movements, and the faults are particularly developed. They provide favorable conditions for accumulation, such as migration and sealing, and may also make the oil-bearing areas unconnected due to the impact of fault sealing. Even the formation of two independent oil-water systems affects exploration, development and production. Effectively describing discontinuous features such as faults is an important basis for avoiding exploration and development risks, and is an important reference for well location deployment. [0003] In the process of oil and gas exploration and development, seismic coherence slicing is an important means to get familiar with the underground structure. The conventional coherence method calculate...

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Problems solved by technology

However, the seismic data are affected by the acquisition method and the size of the fault throw, and the ability of seismic reflection to describe each fault is inconsistent.

When the surrounding points are sampled indiscriminately, the relatively weak fault reflection will be weakened by the averaging effect, and weak faults also have a great influence on the fluid plugging during the production process, and the general coherence method cannot take into account all faults will undoubtedly produce great risk

However, when azimuth filter sampling is used, faults in other directions cannot be taken into account, and multiple coherent slices need to be integrated to understand the development of underground faults, which increases the workload and increases the difficulty of understanding

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