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Seismic reservoir prediction and exploration prospect analysis of shallow gas reservoirs in Qujing Basin, Yunnan Province

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Authors:Chen Hanjun; Ye Tairan; Guo Wei; Dong Xia
Author Affiliations:Primary:
Chengdu University of Technology, Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu, China
SINOPEC Southwest Oilfield Company, China
Volume Title:Shiyou yu Tianranqi Dizhi Oil & Gas Geology
Source:Shiyou yu Tianranqi Dizhi = Oil & Gas Geology, 32(2), p.207-213. Publisher: Zhongquo Dizhi Xuehui, Shiyou Dizhi Zhuanye Weiyuanhui, Dizhi Pucha Kantan Zhu, Beijing, China. ISSN: 0253-9985
Publication Date:2011
Note:In Chinese with English summary. 14 refs.; illus.
Summary:The gas reservoir of Ciying Formation in Qujing basin is a typical lithologic gas reservoir with super-shallow burial depth of 300-450 m. The major reservoir has high porosity and moderate permeability, and its lithology is medium-fine sandstone in point bar of delta plain facies and shows very rapid lateral change. As no specific seismic reservoir prediction technologies are available before, success rate of exploration and development was low. Based on analyses of reservoir physical properties and wave impedance characteristics, forward modeling and seismic response, we established a reservoir prediction model, i.e., mound or lenticular low frequency strong wave trough impedance and low impedance. It was successfully used to predict the distribution of favorable sedimentary facies through analyses of seismic facies and seismic attribute. The interpretation traps of mudstone and coal seam were effectively eliminated. By AVO analyses and multi-wavelet decomposition, a gas reservoir identification model, i.e., type-III AVO, strong low frequency and weak high-frequency was built and applied to predict the distribution of gas reservoirs. The reservoir and gas potential prediction results are integrated to comprehensively evaluate lithologic traps. Several favorable lithologic traps are discovered and successfully verified by drilling, significantly improving exploration success rate. The Neogene basins are widely distributed in Yunnan Province and have great exploration potentials, but are still underexplored by now. The technique of seismic reservoir prediction can be applied for exploration and development of similar gas reservoirs.
Subjects:AVO methods; Cenozoic; Clastic rocks; Geophysical methods; Geophysical profiles; Geophysical surveys; Natural gas; Neogene; Permeability; Petroleum; Petroleum exploration; Porosity; Prediction; Reservoir rocks; Sandstone; Sedimentary rocks; Seismic methods; Seismic profiles; Stratigraphic traps; Surveys; Tertiary; Traps; Asia; China; Far East; Yunnan China; Ciying Formation; Qujing Basin
Coordinates:N254312 N254312 E1035910 E1035910
Record ID:710918-7
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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