The Middle Jurassic Shaximiao Formation in the central area of Sichuan Basin is a delta front de-posit 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 ex-isting P-wave seismic data is unclear,and the productivity of deployed well locations varies greatly,which is difficult to meet the needs of efficient exploration and development of tight gas.In view of the needs of ex-ploration and development and the geological problems faced,such as inaccurate characterization of river sand body boundary and difficult prediction of reservoir gas content,this paper uses the newly collected three-dimensional and three-component seismic exploration data in QL area in 2020 to carry out the re-search.The river carving technology based on multi wave seismic data fusion is formed,which depicts the river boundary more clearly than a single P-wave,and complements the identification of medium and high impedance river sand bodies.The gas bearing prediction technology based on multi wave data is formed.U-sing the differences of seismic amplitude response characteristics and phase characteristics of longitudinal wave and converted wave after gas bearing in river sand body,the multi wave seismic response model of high-yield gas well is established,and the gas bearing prediction results are obtained.The research results support the deployment of tight gas development well location in this area and lay a foundation for efficient development of tight gas.
关键词
四川盆地/沙溪庙组/多波模型正演/多波河道砂体刻画/多波含气性预测
Key words
Sichuan Basin/Shaximiao Formation/multi-wave model forward modeling/multi-wave channel sand body characterization/multi-wave gas prediction
万方数据