Development and exploration practice of the concept of hydrocarbon accumulation in rifted-basin troughs:A case study of Paleogene Kongdian Formation in Cangdong sag, Bohai Bay Basin

• 作者: HAN Wenzhong JIANG Wenya JIN Fengming PU Xiugang XIAO Dunqing ZHAO Xianzheng ZHOU Lihong
• 来源期刊: 石油勘探与开发:英文版
• 学科: 工学
• 关键词: rifted BASIN TROUGH hydrocarbon ACCUMULATION stratigraphic-lithologic reservoir shale oil orderly ACCUMULATION Bohai Bay BASIN Cangdong SAG PALEOGENE Kongdian Formation
• 年，卷（期）: 2018,（6）
• 页码范围: 1166-1176
• 页数: 11页
• 分类号: TE34

摘要

Based on the merged 3D seismic data, well logging, formation testing, analysis and testing data, the structural evolution, sedimentary reservoirs, thermal evolution of source rocks were investigated of Paleogene Kongdian Formation in the trough area of Cangdong sag, Bohai Bay Basin. A conventional-unconventional hydrocarbon accumulation pattern in the trough area of rifted basin was revealed. The reservoir forming elements in the trough area of Cangdong sag have a zonation feature in terms of reservoirs and source rocks. There are two types of reservoir forming models, primary trough and reformed trough. The formation and evolution of trough controlled the orderly distribution of conventional oil to unconventional oil in the trough. Particularly, structural reservoirs occur in the upper part of the trough, stratigraphic-lithologic reservoirs are likely to form in the delta front deposits at the outer ring of trough, the middle ring transitional belt is the favorable site for tight oil reservoirs, while the fine grain deposits zone in the inner ring is shale oil and gas exploration area. The study has pointed out the new domains and directions for searching reserves in the secondary exploration of mature oilfields.