“Four-In-One” Response Characteristic in Sequence Boundary Surfaces of Silurian to Devonian in Tarim Basin and Its Significance to Petroleum Geology
详细信息
- 责任者：Tian Jingchun (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Shao Xiaoyan
- 刊名：Geoscience
- 出版年：2013
- 卷期：27(5)
- 关键词：层序界面 ; sequence boundary ; 油气勘探 ; petroleum exploration ; 塔里木盆地 ; Tarim Basin
- 页码：p.1042-1050
- 图表：11 illus., 1 table, 20 refs.
- 分类号：1003
- issnNo：ISSN1000-8527
- isbnNo：CN11-2035/P
摘要
Based on detailed observation of outcrops of basin rim and the typical drilling cores in basin,analysis of well logs and interpretation of seismic cross-section,the "four-in-one"response characteristic of critical sequence boundary surfaces during the sedimentary evolution of Silurian to Devonian in Tarim Basin are detailedly researched(including S / O sequence boundary surface,corresponding to T0 7 in seismic cross-section;sequence boundary surface between Upper Silurian and Lower-Middle Silurian,corresponds to T1 6 in seismic cross-section;sequence boundary surface between Upper Devonian and Middle Devonian,corresponds to T0 6 in seismic cross-section;sequence boundary surface between Carboniferous and Devonian,corresponds to T7 5 in seismic cross-section),in other words,characteristics of sequence boundary surfaces in outcrops,cores,well logs and seismic cross-section.The results show that the sequence boundary surfaces display unconformity in outcrops and cores,saltation in well logs and uplap,downlap or truncation in seismic cross-section.Afterwards,the petroleum geological significance of sequence boundary surface formation is detailedly elaborated as follows:(1)the sequence boundary reflects the conversion of the basin nature in critical period;(2)the sequence boundary is an important channel for oil and gas migration;(3)the sequence boundary surfaces are beneficial to the formation of trap.The acquisition of the thesis research will provide an important foundational geological data for further oil and gas exploration of Silurian to Devonian in Tarim Basin.