Identification of deep tight gas reservoirs in western Sichuan Depression by full-wave attributes
Xu Tian-ji1,2, Cheng Bing-jie1,3, Cai Xi-yuan4, Tang Jian-ming2
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, CDUT, Chengdu, Sichuan 610059, China;
2. Exploration & Production Research Institute Deyang Branch, Southwest Branch Co., Sinopec, Deyang, Sichuan 618000, China;
3. College of Geophysics, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
4. Sinopec, Beijing 100728, China
Abstract：Gas reservoirs in Xinchang Gas field,Western Sichuan Depression have some tough geologic conditions with complex structure,deep burying(about 5000m),strong anisotropy and strong concealment.For seismic response,sometimes P wave reflection is disordered and weak,and sometimes both P wave and S wave reflection are disordered and weak.Thank to 3D3C seismic data in the area,we utilize full-wave attributes to identify deep tight gas reservoirs by using some techniques including analysis of absorption and velocity dispersion,absorption prediction of tow-phase media,extraction of multi-scale absorption,analysis of frequency-dependent characters,elastic impedance coefficient inversion,pre-stack P and S wave joint inversion,post-stack P and S wave joint inversion.Full-wave attributes gas detection are carried out by P and S wave attributes and multi-wave attributes.With the help of interactive interpretation of multi-data and more geophysical and geological information,this technique provides a new way for unconventional gas reservoir detection.
徐天吉, 程冰洁, 蔡希源, 唐建明. 利用全波属性参数识别川西深层致密气藏[J]. 石油地球物理勘探, 2011, 46(5): 749-756.
Xu Tian-ji, Cheng Bing-jie, Cai Xi-yuan, Tang Jian-ming. Identification of deep tight gas reservoirs in western Sichuan Depression by full-wave attributes. OGP, 2011, 46(5): 749-756.
