Evolution of Uplift-Depression Framework in the Middle Western Sichuan Depression and Its Control on Hydrocarbon Accumulation
详细信息
- 责任者：Guo Yingchun (State Key Laboratory of Petroleum Resource and Prospecting ; China University of Petroleum ; Beijing 102249 ; China) ; Pang Xiongqi
- 刊名：Natural Gas Geoscience
- 出版年：2013
- 卷期：24(1)
- 关键词：隆起 ; uplifts ; 油气藏形成 ; reservoir formation ; 四川盆地 ; Sichuan Basin
- 页码：p.29-37
- 图表：illus., 1 table, 17 refs.
- 分类号：1003
- issnNo：ISSN1672-1926
- isbnNo：CN62-1177/TE
摘要
Based on drilling information and seismic data,and through the restoration of deposit thickness since the second member of Xujiahe Formation(T3x2) in the middle western Sichuan depression,the uplift-depression framework evolutionary process is reconstructed.Combined with drilling results and fluid inclusion analysis technique,the paper illustrates the gas accumulation pattern and process of T3x2.The results show that the palaeotectonic physiognomy underwent apparent changes of configuration of the uplift-depression.The present Xiaoquan-Fenggu structural zone in the middle Chuanxi depression went through the evolution from wide gentle slope to depression,and eventually to uplift.While the evolution of Yazihe zone was from deep depression to high uplift.The palaeo-uplift of T3x2 did not play the controlling role for the conventional reservoir.The gas,sealed in the Yazihe palaeo-depression because of early densification of reservoir,was charactered by deep basin gas.The later tectonic uplift and uplift-depression evolution as well as induced fractures break the steady state of the deep basin gas,and caused gas lateral migration,eventually forming the present pattern,that is "continuous distribution & sweet point enrichment".