关键词: 霍多莫尔构造带, 　南屯组, 　湖底扇, 　沉积特征, 　油气地质意义

Abstract: The sedimentary characteristics of the sublacustrine fan body and its petroleum geological significance are studied based on core, logging, logging and seismic data. It is found that the sublacustrine fan deposits in this area can be divided into three subfacies: inner fan, middle fan and outer fan, and five types of sedimentation, including main channel, braided channel and turbidite of inner fan. Cumulative microfacies. The lower part of the sublacustrine fan deposit in the Huodomoer structural belt is adjacent to the best source rock section of Nantun Formation. Oil and gas are injected into the sublacustrine fan sand body from the bottom and side, and are usually blocked by faults to form fault⁃lithologic reservoirs or directly blocked by surrounding mudstones to form lenticular lithologic reservoirs. The hydrocarbon accumulation is mainly controlled by reservoirs. Physical characteristics of layers. The experimental analysis shows that the reservoir capacity of different sedimentary microfacies is quite different. The braided channel microfacies of the middle fan is the most favorable reservoir facies type, followed by the main channel microfacies of the inner fan, which is the more favorable reservoir. Oil and gas exploration practice also confirms that high⁃yield wells are mostly located in braided channel microfacies of middle fan and have broad prospects for exploration.

Key words: Hodomoer structural belt, Nantun formation, Sublacustrine fan, Sedimentary characteristics, Geological significance of oil and gas