南堡凹陷古近系有利构造砂质碎屑流储层评价

Sandy Debris Flow Reservoir Evaluation of Paleogene Favorable Structures in Nanpu Sag

为了研究砂质碎屑流储层类别及其发育特征,基于大量岩心分析数据,结合地震资料及前人研究成果,依据单井点评价与整体评价结合的思路,通过储层分类方法,对南堡凹陷古近系重点构造发育的砂质碎屑流储层进行综合评价。研究表明:储层岩石类型主要为岩屑长石砂岩及长石岩屑砂岩,具有成分成熟度中等、结构成熟度低—中等的特点;储层物性较差,主要为低孔低渗储层,并具有较强的层间和平面非均质性;2号构造东三段与3号构造沙一上亚段储层质量较好,以Ⅱ类和Ⅰ类为主,而3号构造沙一下亚段储层质量相对较差。该研究对南堡凹陷油气有利区带预测及井位部署具有重要指导意义。

A large number of core test data were used to classify the sandy debris flow reservoir and investigate its development patterns by combining with seismic data and previous researches.Based on the combination between single-well evaluation and integral evaluation,the sandy debris flow reservoir in the Paleogene Favorable Structures of Nanpu Sag were comprehensively evaluated through reservoir classification method.Result indicates that the reservoir rock mainly consists of lithic feldspar sandstone and feldspathic lithic sandstone,which are characterized by medium composition maturity and low-medium structure maturity.The reservoir with relatively low quality is mostly low-porosity and low-permeability reservoir with relatively strong interlayer and lateral heterogeneities.The Dong-3 Member of No.2 Structure and upper Sha-1 Sub-member of No.3 Structure indicate favorable reservoir qualities,which are mainly classified as Category-Ⅰ and Category-Ⅱ reservoirs.The lower Sha-1 Sub-member in the No.3 Structure show a poor reservoir quality.This research could provide certain guidance for the prediction of favorable hydrocarbon zones and the well deployment.