• 责任者：Zhang Cheng (Key Laboratory of Tectonics and Petroleum Resources ; Ministry of Education ; China University of Geosciences ; Wuhan 430074 ; China) ; Xie Xinong
• 刊名：Earth Science
• 出版年：2013
• 卷期：38(4)
• 页码：p.807-818
• issnNo：ISSN1000-2383
• isbnNo：CN42-1233/P

The geological evolution of the Bozhong sub-basin, characterized by rapid subsidence and strong fault activities since the initiation of the Dongying Formation, exerts important effect on the characteristics of hydrocarbon accumulation in this are- a, which is distinguished from those in other areas in the Bohai Bay Basin. Uplifts around depressions serve as predominant sites for hydrocarbon accumulation, and the distribution and evolution of pathway systems have obviously been controlling hy- drocarbon migration and accumulation. Based on clarification of the distribution of hydrocarbon source rocks and petroleum re- sources in the large-scale Bozhong petroleum system, growing characteristics of all kinds of potential pathways and their spatial relevance are analyzed by means of multiple data, and then three pathway system types controlling hydrocarbon migration and accumulation： fault-dominant, carrier bed-dominant and unconformity-dominant types are identified. Long-term growth faults adjoining uplifts act as the predominant pathways for vertical fluid release and hydrocarbon migration, and control hydrocarbon accumulation in the Neogene reservoirs on uplifts. Especially in the active stage of tectonic movement, the open long-term growth faults must be preferential pathways for the rapid vertical hydrocarbon migration. The interconnected sandbodies in the Paleogene Shahejie and Dongying Formations, directly contacting with active hydrocarbon source rocks, serve as the primary sites and starting stations for the early and late hydrocarbon migration and accumulation, respectively. Therefore, they not on- ly control hydrocarbon accumulation in the Paleogene traps, but also directly impact hydrocarbon supply to the Neogene trap on uplifts to some extent. Unconformity Ta, resulted from regionally tectonic transformation in last Mesozoic, serve as pathwayfor deep lateral hydrocarbon migration and control hydrocarbon accumulation in the buried hill type reservoirs due to its im- proved permeability attributed to long-term weathering process. Three types of pathway systems all impact even control the times, locations, velocities and scales of hydrocarbon accumulation in various degrees. However, the fault-dominant type path way system shows the most outstanding effect among them.