苏北盆地油气富集与分布的主控因素

根据烃源岩及沉积体系的分布、断裂的发育与分布、盖层的发育状况、圈闭形成时期等因素与油气富集特征的分析,认为苏北盆地各凹陷的油气富集程度与其烃源岩的发育程度有关,油气藏的形成及分布与断层密切相关,断层是控制油气成藏与富集的主要因素之一;紧邻生烃中心的长期隆起区是油气运移的指向区,控制油气的聚集成藏;区域盖层阻止油气往上覆层运移,其下伏储集层段为油气富集层段,缺乏统一区域性盖层的层段,局部盖层发育与否直接影响油气富集程度;沉积体系的分布控制油气的分布和富集地区。

Main control factors for oil and gas enrichment and distribution in North Jiangsu Basin

North Jiangsu Basin is a sedimentary basin enriched with petroleum resources. Based on the analyses of relationship between hydroxide source rocks and sedimentary formation distrbution, fault development and distribution, cap rock distribution, forming stage of trap and petroleum enrichment characteristics in the basin, the authors considered that the abundance of oil and gas enrichment in every sag was directly related with the source rock development; the formation and distribution of oil deposits were closely related with fault and fault was one of the primary factors of controlling oil and gas formation and enrichment; the long-term uplift area near the oil generating center was the orientation region of oil and migration that controlled the accumulation of oil and gas; regional cap rocks served to prevent the oil and gas from migrating up to the upper overburdens, and the reservoir underlying was the enrichment strata for oil and gas accumulation, an unified regional cap layers were absent and the development of caps affected the enrichment of oil and gas; the distrbution and enrichment of oil and gas are dependant on the distribution of sedimentary formation.