Abstract
Having been one of the key areas for hydrocarbon prospection of Tarim Oilfield Company, Kuqa Mountain in Tarim Basin has significant LVL survey, modeling difficulty and statics problems due to its diversified near-surface conditions. In this paper, the author makes an accurate analysis on the near-surface structure in the area using the uphole-constraint shallow-layer tomography LVL surface method, the pseudo 3D near-surface modeling and the comprehensive statics technology and therefore, the imaging of sections is improved, which provides a reference for the near-surface modeling and statics works in similar areas.
Highlights
The Kuqa foreland basin of Tarim is rich in oil and gas resources and has huge exploration potential, so it plays an important role as one strategic area of substitution for energy in China
The areas with thick Gobi gravel have a relatively flat topography, with a stable, gradual, and relatively small elevation difference. This is favorable to the applicable conditions of the shallow tomographic survey method, and surface modeling method based on pseudo 3D tomography can be performed to establish the near-surface model in this area, so that the derived near-surface model can meet the needs of field processing
The unified tomographic inversion is performed for the surface model of thick Gobi gravel areas, and the near-surface model of the entire area of interest is established in combination with the uphole surveys of the mountain areas and field model statics can be provided
Summary
The Kuqa foreland basin of Tarim is rich in oil and gas resources and has huge exploration potential, so it plays an important role as one strategic area of substitution for energy in China. The complicated near-surface structure of Kuqa poses the following challenges to field static correction work. The Kuqa piedmont area has a very thick Gobi gravel layer with a wide distribution range. The thickness of the weathered zone is quite thick, even up to more than 200m, so the survey accuracy using the shallow refraction method is very low. The near-surface model is established by interpolating the interpretation results of uphole surveys, so the accuracy of the model depends heavily on the density and distribution of upholes. In the Kuqa depression, seismic survey is mainly troubled by complex wave field and low signal-to-noise ratio, resulting from the seismic geological conditions of the piedmont zone. Since the accuracy of statics correction will directly affect the imaging quality of the final section, higher requirements are imposed on the statics correction technique
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