海拉尔盆地贝中次凹南屯组一段储层特征分析及评价

ANALYSIS AND EVALUATION OF THE RESERVOIR CHARACTERISTICS OF NANTUN NO. 1 MEMBER IN BEIZHONG SUB-SAG OF HAILAR BASIN

以岩石薄片、扫描电镜、物性、毛管压力等分析资料为基础，结合储层物性测井参数解释结果，对贝中次凹南屯组一段储层从沉积特征、储层展布、物性特征、岩性特征、孔隙类型及孔隙结构、主控因素等方面进行了综合评价。证实该储层为一套低孔特低渗储层，其物性主要受沉积微相及成岩作用控制，储层主要发育在研究区的西部和中南部地区。综合储层的岩性、物性、成岩后生作用和孔隙结构等特征，参考松辽盆地储集层分类标准，对贝中次凹南屯组一段储层进行了分类，将其划分为Ⅰ（好）、Ⅱ（中等）、Ⅲ（差）、Ⅳ（极差）4大类，区内主要发育Ⅱ类储层，少量Ⅰ类储层，为海拉尔盆地贝中次凹的进一步勘探提供了可靠依据。

Basing on the following analyzing data： rock section, SEM （ scanning electron microscope） , physical properties, CP curves and so on, and moreover integrating the interpretation results of well logging parameters for the reservoir physical properties, the sedimentary characteristics, reservoir distribution, physical and lithological properties, pore type and structure, main controlling factors of the reservoirs and so forth are comprehensively evaluated. This reservoir is proven to be a set of low-porosity and ultra-low permeability layers, their physical properties are principally dominated by sedimentary microfacies and diagenesis. Most of the reservoirs are well-developed in the west and south of the studied region. Combining with the following reservoir characteristics： lithological and physical properties, after-action of the diagenesis, pore structure and so on, through referring to the reservoir classification standards of Songliao Basin, the reservoirs in Nantun No. 1 Member have been divided into four types： Type Ⅰ （good）, Type Ⅱ（medium）, Type Ⅲ （poor）, Type Ⅳ （very poor）. Type Ⅱ reservoir is well-developed and Type I is seldom developed in the studied region. The above results can provide reliable evidences for the further exploration of Beizhong Sub-sag of Hailar Basin.