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Pre‐stack Simultaneous AVO Inversion and Lithology Prediction of Shale Gas Reservoir
Author(s) -
WANG Fei,
CHENG Lijun,
XIE Qingming,
HUANG Zhenhua
Publication year - 2015
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12306_1
Subject(s) - lithology , inversion (geology) , geology , stack (abstract data type) , shale gas , oil shale , petroleum engineering , petrology , mineralogy , seismology , paleontology , computer science , tectonics , programming language
free forms . Shale gas reservoirs have the characteristics of self-generating and self-preserving, low density, low porosity and low permeability, which make the seismic prediction difficulty. But the anisotropy of shale gas reservoir is also 30% 40% . Based on the prediction technology of conventional oil and gas, apply pre-stack simultaneous inversion technique, use different offset gathers and p-wave and s-wave and density logging data, then, inverse the elastic parameters such as Poisson’s ratio, p-wave impedance, s-wave impedance and density, predict the brittleness, physical property, lithology of shale gas reservoir and identify shale gas sweet spot effectively . The research area is located in the southeast of Chongqing. The 3d seismic data in the target zone has strong reflected energy, good continuity, and high signalto-noise ratio. In the 300ms time window up and below the target layer, the main frequency is 30 Hz, high cut-off frequency is 73 Hz. This study inversed various elastic parameters of the shale reservoir and predicted the lithology using pre-stack simultaneous AVO inversion technology.