Sand-Gathering and Reservoir-Controlling Mechanisms of Paleogene Slope-Break System in Qikou Sag, Huanghua Depression, Bohai Bay Basin
详细信息
- 责任者：Zhou Lihong (Dagang Oil Field Company ; PetroChina ; Tianjin 300280 ; China) ; Pu Xiugang
- 刊名：Petroleum Geology & Experiment
- 出版年：2011
- 卷期：33(4)
- 关键词：岩性油气藏 ; lithologic reservoir ; 黄骅坳陷 ; Huanghua Depression ; 渤海湾盆地 ; Bohaiwan Basin
- 页码：p.371-377
- 图表：illus., 1 table, 16 refs.
- 分类号：1003
- issnNo：ISSN1001-6112
- isbnNo：CN32-1151/TE
摘要
Based on tectonic background and taking into consideration of sedimentary element,the concept of slope-break system has been proposed.In the Qikou Sag,5 types of slope-break zone have been found in the study area,including tectonic(steep and gentle slopes),flexural,sedimentary,ancient landscape and erosive ones.The distribution of slope-break zone is influenced by ancient tectonic background,fault activity and sedimentary diagenesis.Similar to sedimentary system,various types of slope-break in the Qikou Sag match with each other both horizontally and vertically,accounting for over 70% of the sag area.Slope-break provides underwater channel for source supply,and also offers accommodation,resulting in sand assemblage in slope and depression.Sand distribution is controlled by the following mechanism: source providing sand,groove transporting sand,slope-break controlling sand and source type determining sand gathering.Thanks to wide-distributed reservoir,petroleum has been found all over the sag.The Qibei and Binhai slopes and the Banqiao subsag are the favorable exploration regions for Paleogene lithologic reservoir in the Qikou Sag.