燕山地区中新元古界储集体类型及特征

Types and characteristics of Mesoproterozoic and Neoproterozoic reservoirs in Yanshan Region

燕山地区中、新元古界具有较为理想的生烃、储层和盖层条件,勘探前景良好。文中运用近年发展的储层研究新理论、新方法,全面开展物质组分、结构构造等岩石学特征的研究,结合沉积相的研究成果,对碳酸盐岩与砂岩储层进行科学的成因分类;阐明各类储集岩的岩石类型、岩石学特征及其组合、分布规律。研究区冀北坳陷和宣龙坳陷中、新元古界的高于庄组、雾迷山组和铁岭组主要为一套碳酸盐岩沉积,下马岭组底部主要为一套碎屑岩沉积。识别并划分了11种储集岩类型;同时依照储集条件的相对好坏将储集岩类型粗略分为4个类别,其中古风化壳云岩类储集岩、藻礁体储集岩及障壁岛海滩石英砂岩储集岩3类储集岩为储集条件好的储集岩。

Ideal hydrocarbon generation, reservoir and cap rock conditions are indicated in Mesoproterozoic and Neoproterozoic of Yanshan Region, which has a good exploration prospects. Therefore, according to the new theories and new methods of reservoir study that developed in recent years, the genetic classification of carbonate reservoir and sandstone reservoir is carried out through the analysis of petrology characteristics of physical components and structures, combined with the study result of sedimentary facies in this paper. The paper describes the rock type, petrology characteristics, assemblage and distribution of reservoir for various types of reservoirs. The reservoir is mainly a set of carbonate depositions in Gaoyuzhuang Formation, Tieling Formation and Wumishan Formation of Mesoproterozoic and Neoproterozoic in North Hebei Depression and Xuanlong Depression, Yanshan Region. A set of clastic rock deposits at the bottom of Xiamaling Formation. Eleven kinds of reservoir types have been identified. The reservoirs can be roughly classified into four types according to the reservoir conditions, in which the good reservoir conditions are shown in the reservoir rocks of paleo-weathering crust, algal reef and quartz sandstone of barrier island foreshore.