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为了对内蒙古东部陆西凹陷进行油气勘探,分析了该区油藏形成的地质条件和不同类型的油藏特点,总结出其分布规律:陆西凹陷在断陷演化期发育了3套烃源岩地层,九佛堂组有机质质量分数高,为主力生油层系;扇三角洲前缘亚相各种成因类型砂是最主要的储集砂体,其中前缘亚相的中部带和边缘带是最有利的储集相带;凹陷内发育背斜、断鼻、砂岩上倾尖灭等油藏.通过对已知油藏的分析认为:成熟烃源岩的分布范围、生储配置关系、有利沉积相带和构造样式控制不同类型油藏的形成和分布;凹陷的陡坡带以构造油藏为主,斜坡带以构造-岩性及储层上倾尖灭油藏为主,深陷带主要为透镜状岩性油藏;九佛堂组上段储层发育、储集物性相对较好,夹持和嵌入主要生油岩层中,油气最为富集.根据目前的勘探现状及油藏形成条件和分布规律,指出应围绕生油岩发育、面积较大的洼陷进行勘探.
In order to carry out oil and gas exploration in Luxi depression in eastern Inner Mongolia, the geological conditions and different types of reservoirs formed in this area are analyzed, and the distribution rules are summarized. Three sets of source rocks In the strata and Jiufotang Formation, the organic matter mass fraction is high, which is the main oil source formation. The fan-shaped delta front facies sand bodies are the most important reservoir sand bodies, and the middle zone and marginal zone of the front facies subfacies are the most Favorable reservoirs and facies belts.The anticline, nosebreak and sandstone updip are developed in the depression.According to the analysis of known reservoirs, it is considered that the distribution range of mature source rocks, the relation between reservoir and reservoir configuration, favorable deposition The belts and tectonic styles control the formation and distribution of different types of reservoirs. The steep slope depression is dominated by structural reservoirs. The slope zone is dominated by tectono-lithology and updip reservoirs. Lenticular lithologic reservoirs. The reservoirs in the upper part of Jiufotang Formation are relatively well developed and are relatively well-preserved in reservoirs, which are most enriched in oil and gas during the grasping and embedding of major oil-bearing formations. Based on current exploration status and reservoir formation conditions and distribution Law, pointed out that should be around the source rock development, area Large sag exploration.