Seismic reflection features and analysis of hydrocarbon accumulation of reversed anticlines in complicated mountainous areas

doi:10.3969/j.issn.1672-7703.2019.03.011

Abstract

Abstract: The reversed anticline is one of the most important hydrocarbon-bearing structures in the mountainous area in western China. Many wells drilled in the steep and complicated structures failed, largely due to insufficient understanding on the geological and seismic reflection characteristics of the reversed anticlines. Based on surface geology, drilling and well logging data, different modes of reversed anticlines were established, then the seismic response features of different types of reversed anticlines were analyzed through forward modeling and migration, and finally the reversed anticlines were recognized based on seismic sections. This method is helpful to identifying the forms of the reversed anticlines. For the complicated mountainous structures with seismic data with high SNR, pre-stack depth migration sections can clearly show the forms of the reversed anticlines. If the normal limb of the reversed anticline is less denuded and moderately buried, it may be a good hydrocarbon trap. If the limb is steep and faults are developed, the conditions for hydrocarbon accumulation may be poor. The buried anticlines beneath the reversed limb have good preservation conditions favorable for hydrocarbon accumulation, so they are promising targets for hydrocarbon exploration.

Key words: reversed anticline, structural feature, well logging response, seismic response, identification, hydrocarbon accumulation

CLC Number:

Liang Shunjun, Liang Xiao, Chen Jiangli, Sun Fu, You Liwei, Deng Shaoqiang, Li Jinzhi, Fan Jun, Gao Huaijun, Han Youping, Wu Yulin, Wu Zengyou. Seismic reflection features and analysis of hydrocarbon accumulation of reversed anticlines in complicated mountainous areas[J]. China Petroleum Exploration, 2019, 24(3): 377-390.

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