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- Title
断陷湖盆天然气成藏生—运—聚动态模拟 ——以渤海湾盆地辽河坳陷为例.
- Authors
杨思博; 李美俊; 王延山; 肖 洪; 黄双泉; 康武江; 王方正
- Abstract
Effective identification of the source and generation-migration-accumulation characteristics of natural gas is of great guiding significance to evaluating the potential of natural gas resources and determining the direction of natural gas exploration. Rift lake basins are characterized by strong heterogeneity of source rocks and various genetic types of natural gas, which lead to ambiguity in gas source identification and resource evaluation. To solve this problem, this paper investigates the gas sources in the Huanxiling area of the Liaohe Depression, Bohai Bay Basin by the representative effective source rock classification and natural gas genesis type discrimination method for rift lake basins. Then, dynamic simulation of gas generation, migration and accumulation is carried out based on the representative profile, and a dynamic accumulation model of natural gas is summarized. Finally, the future direction of natural gas exploration is pointed out. And the following research results are obtained. First, the Lower-Middle Sub-member of the Third Member and the Fourth Member of Paleogene Shahejie Formation are the main source rock layers. The source rocks formed in different tectonic positions are different in types, and there are humic and sapropelic source rocks, which generate oil-type gas and coal-type gas respectively. Second, various types of natural gas formed in this area migrates and accumulates within a transport system composed of complex fractures, sand bodies and unconformity surfaces, to form mixed-genetic gas reservoirs. Third, there are two migration and accumulation systems in the Huanxiling area, i.e., System I and II. The migration and accumulation system in the Upper Sub-member of the Fourth Member of Shahejie Formation from the western slope belt to Shuangtaizi structural belt is System I, which is near-source accumulation of oil-type gas. The migration and accumulation systems in the rest zones are System II, which is long-distance migration and accumulation of oil-type and coal-type gases. Fourth, natural gas reservoirs in the Huanxiling area are in the hydrocarbon accumulation model of single sag, multiple sources and late stage. The spatial differential distribution of source rocks and the complex fault system jointly control the genetic diversity and distribution complexity of gas reservoirs in this area. In conclusion, the generation-migration-accumulation dynamic model of natural gas reservoir in rift lake basins shows the gas sources of Huanxiling area, and suggests that the eastern steep slope zone near the inside of the sag is a favorable area for natural gas exploration. The research results provide a reference for natural gas exploration in other rift lake basins.
- Subjects
NATURAL gas prospecting; GAS reservoirs; WATERSHEDS; NATURAL gas; GAS dynamics; HYDROCARBON reservoirs
- Publication
Natural Gas Industry, 2023, Vol 43, Issue 9, p73
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2023.09.007