Method for enhancing riverway geological anomalous body imaging based on gather data reconstruction

Abstract

The invention provides a method for enhancing riverway geological anomalous body imaging based on gather data reconstruction, and relates to the field of petroleum and natural gas exploration. The method comprises the following steps: (1) designing a calculation grid, determining a riverway plane position, and calculating central angle data values of inner and outer grid points of a riverway; (2)classifying the central angle data on the grid points in the riverway, and calculating the optimal azimuth angle and the incident angle parameters of each type of central angle to obtain gather reconstruction parameters corresponding to each data point; and (3) carrying out data reconstruction on each trace gather data by utilizing the trace gather reconstruction parameters of each data point to obtain the pre-stack gather data volume. Accurate imaging work of the riverway system and the like in a research area is achieved, the position prediction precision of the geological anomalous body ina related exploration area is improved, then the drilling risk is reduced, and the economic benefits of oil and gas exploration of the riverway system are improved.

Description

technical field [0001] The invention relates to the field of oil and gas exploration, in particular to a method for enhancing channel geological anomaly body imaging based on gather data reconstruction. Background technique [0002] In the current stage of oil and gas exploration, the channel is a geological target with high exploration value. For example, in the oil and gas exploration in the Sichuan Basin (such as the Penglaizhen Formation, Qianfoya Formation, etc.), the channels in the continental strata are relatively well-developed, and the wells drilled on the channels often obtain high-yield industrial gas flow; There is often no gas or weak gas production; in Northeast China, the detection of channels is also relatively important, and the sand bodies in the channels of continental strata are relatively developed, resulting in the development of reservoirs, and a high degree of attention is paid to channels. In addition, in the practice of oil and gas exploration, it...

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Problems solved by technology

[0006] (3) Due to the wavelet stretching effect of the seismic traces in the gather, the superposition of the full incident angle range also suppresses the seismic response of the river channel

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