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- Title
Identification of single channel sand body in the subaqueous distributary channel compound sand bodies on the basis of forward simulation.
- Authors
Wang Jun; Gao Yin-shan; Wang Hong-jun; Wang Xin-xing; Bao Zhi-dong; Zhang Hong-jing
- Abstract
Subaqueous distributary channel is one of the major sand body types in shallow water delta facies, but limited by its size. How to characterize the single channel sand body in the compound channel sand bodies becomes a difficulty in the development geology research now. Taking the Gaotaizi oil layer in Qian'an Oilfield as an example, combined with well logs and seismic data, the single channel sand body in the subaqueous distributary compound sand bodies of the target layer is divided and recognized. The research shows that the lateral spatial overlay relationship between the single channel sand bodies in the compound channel sand bodies can be divided into three types, i. e., mutual overlay style, contact style and isolation style. They are respectively corresponded to six log-geology recognition remarks, i. e., one-sided lateral overlay type, both-sided lateral overlay type, thickness difference type, thick-thin-thick type, sand deposit between channels type and mud deposit between channels type. According to the log data in the high density well area, practical geology model of six recognition remarks is established, then single channel composite forward model corresponding to each geology model has been built through seismic forward simulation. Seismic response characteristics of the joint point in each forward model is"energy unchanged, peak shift, trough dislocation", "energy unchanged, waveform down shift", "energy reduced, waveform stretch, up shift", "energy unchanged, single peak move up", "energy reduced, visual thickness increased, boundary wave peak shift", and"low energy, complex wave emerged". The empirical formula of sand width/thickness ratio of the single subaqueous distributary channel sand body is fitted by the result of single channel sand division in the high density well area. With this guidance and looking for the similar seismic response characteristics between wells in the practical seismic profiles with the established forward models, the recognition of single channel sand body in the subaqueous distributary channel compound sand bodies in the low density well area is accomplished.
- Subjects
WAVE analysis; LOGGING; SEISMIC waves; SAND; GEOLOGY
- Publication
Natural Gas Geoscience, 2018, Vol 29, Issue 9, p9
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2018.07.016