Discovery and Its Geological Significance of Ultra-water: 1 000 m in the Middle of Member 3 of Shahejie Formation During Paleogene in Liaoxi Depression, China(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2018年第01期
- Page:
- 11-23
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Discovery and Its Geological Significance of Ultra-water: 1 000 m in the Middle of Member 3 of Shahejie Formation During Paleogene in Liaoxi Depression, China
- Author(s):
- ZHONG Jian-hua; NI Liang-tian; SHAO Zhu-fu; SUN Ning-liang; HAO Bing; SUN Hong-bin; LIU Bao; LIU Chuang; YANG Guan-qun; WANG Bin; LI Wei-hua; YU Yan-ling; LUO Ke
- 1. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China; 2. School of Earth Sciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;3. Liaohe Oilfield Company, PetroChina, Panjin 124010, Liaoning, China
- Keywords:
- ultra-deep water; Paleogene; member 3 of Shahejie Formation; foreset bed; rift; petroleum; Liaoxi depression
- PACS:
- P618.13
- DOI:
- -
- Abstract:
- Liaoxi depression is an important petroleum producing area in Liaohe oilfield, in which the high-quality source rocks develop in Paleogene. Paleogene overlying water depth in Liaoxi depression is up to 1 000 m, and it is an ultra-deep water depression. The ultra-deep water is found primarily by seismic analysis of Paleogene Qijia fan; mainly through the analysis of lines 1518 and 1631 (combined with the sedimentary characteristics of drill core), the maximum height of foreset bed of fan delta front in the middle of member 3 of Paleogene Shahejie Formation is 1 000 m; through the inversion of paleo-water depth, the maximum water depth of member 3 of Paleogene Shahejie Formation in Liaoxi depression is about 1 150 m; a large number of mud gravel gravity flow dominated sedimentary boulders develop specially in the condition of ultra-deep water. The dip angles of delta foreset bed are 26°-29°. The change of Paleogene water depth in Liaoxi depression experiences a rapid deepening and a slow shallowing evolution; the magma erosion diapiric thermal subsidence and surface erosion make the basin basement rapid subsidence substantially. The ultra-deep water in Liaoxi depression, which is formed under the dynamic background of the extremely rapid subsidence of rift valley, lays the foundation for the formation of high-quality source rocks and petroleum reservoirs in member 3 of Shahejie Formation. The discovery of ultra-deep water in the middle of member 3 of Shahejie Formation in Liaoxi and Dongying depressions reveals the possible existence of a lot of depressions with deep or ultra-deep water in the middle of member 3 of Shahejie Formation in Bohai Bay Basin, and then reveals the potential of high-quality source rocks and petroleum resources in Bohai Bay Basin and Yellow Sea.
Last Update: 2018-03-08