Abstract：The Sulige Gas Field in the Ordos Basin is the largest onshore integral “three-low” gas field discovered in China. It is located on the wide and gentle west-dipping monocline in the west of the Yishan Slope in the basin, and on the whole, no faults or structures have developed in this gas field. The main gas-producing layers in this gas field are the tight sandstone reservoirs in fluvial facies in the He-8 Member of the Permian Lower Shihezi Formation and the Shan-1 Member of the Shanxi Formation.The sand bodies distributed in a north-south zonal pattern are generally characterized by longitudinal multi-stage superposition and transverse composite linkage, posing great difficulty for effective seismic reservoir prediction and horizontal-well geosteering. For this reason, sand body distribution is predicted by availing 3D seismic data, the characteristic modules in the GeoEast interpretation system, seismic attributes, such as root-mean-square amplitude, single-frequency volume, and highlight volume, and prestack shear wave impedance inversion. The fluid mobility, gas-bearing detection technology, and prestack elastic parameter inversion are used to predict gas bearing. Multi-information fusion technology is employed to select the sweet spot area. The seismic prediction results are converted into the depth domain by the dynamic time-depth conversion of well-constrained high-precision velocity field construction. The application of seismic technologies in the whole process of placement, trajectory optimization, and geosteering while drilling of horizontal wells is thereby achieved. The characteristic technologies of the GeoEast interpretation system for post-stack seismic attribute analysis, seismic inversion, oil and gas detection, and multi-information fusion can be used to predict thin gas-bearing sandstone reservoirs and select favorable target areas, and the results they deliver are remarkable.
王雅婷, 刘峰, 王永刚, 张盟勃. 三维地震致密薄储层预测及水平井导向技术在苏里格气田中的应用[J]. 石油地球物理勘探, 2022, 57(s2): 87-91.
WANG Ya-ting, LIU Feng, WANG Yonggang, ZHANG Mengbo. Application of technologies of tight thin reservoir prediction based on 3D seismic data and horizontal well geosteering in Sulige Gas Field. Oil Geophysical Prospecting, 2022, 57(s2): 87-91.
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