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- Title
塔里木盆地哈拉哈塘地区二叠系火成岩体对 下伏地层地震成像影响.
- Authors
孙东; 石小茜; 王振卿; 陈利新; 王靖; 孙甲庆; 代冬冬; 房启飞
- Abstract
In order to get an accurate view of the influence of thick igneous rock on the seismic imaging of the underlying strata, based on the actual drilling and logging data and the 3 Dseismic data, the CambrianCretaceous simplified geologic model, and the finite difference method are used to solve the elastic wave equation. The forward equation simulation of the wave equation is carried out, the true restoration seismic imaging process is carried out, and the influence of the Permian igneous rock body on the seismic imaging of the underlying strata is discussed. Paleozoic oil and gas exploration and development play a certain reference. The results show that the high-speed and high-density Permian dacite have shielding effect on the seismic imaging of the underlying strata, and the amplitude of the reflected wave of the underlying strata is obviously weakened relative to the periphery of the covering area. Due to the lateral mutation of the lithology, the seismic imaging of the layers has obvious deformation and tectonic anomalies, rather than the seismic response of the fault zones or volcanic channels. The wavefield of fracture-cavern body in the disorder reflection region and underlying region of volcanics is very complex and the imaging velocity is difficult to pick accurately, which leads to distorted migration results and not convergent bead-like reflection.
- Publication
Natural Gas Geoscience, 2018, Vol 29, Issue 12, p1781
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2018.10.019