Abstract
The Middle Jurassic Shaximiao Formation in the central area of Sichuan Basin is a delta front deposit with underwater distributary channel sand bodies, which is a new round of unconventional natural gas exploration and development in this area. However, the boundary of channel sand body depicted by the existing P-wave seismic data is unclear, and the productivity varies greatly, which is difficult to meet the needs of efficient exploration and development of tight gas. In view of the needs of exploration and development and the geological challenges faced, such as inaccurate characterization of channel sand body boundary and difficulty in gas-bearing detection. This paper uses the newly collected three-dimension and three-component seismic data in QL area in 2020 to carry out research. The river channel carving technique based on multicomponent seismic data fusion is formed, which depicts the river boundary more clearly than that from single P-wave, and complements the identification of medium and high impedance river sand bodies. The gas-bearing detection techniques based on multicomponent data is formed. Using the differences of seismic amplitude and phase response of P-wave and converted wave of gas-bearing sand body, the multicomponent seismic response model of high-yield gas well is established, and the gas-bearing detection results are obtained. The research results support the deployment of tight gas development well in this area and lay a foundation for efficient development of tight gas.
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