地质学报Issue(8)：1588-1602,15.
渤海湾盆地北塘凹陷古近系沙河街组三段白云岩储层特征
Characteristics of Dolostone Reservoir in Sha 3 Group from Palaeogene Shahejie Formation in Beitang Sag,Bohaiwan Basin
摘要
Abstract
Dolostone is widely distributed in third section of Palaeogene Shahejie Formation from Beitang Sag in Bohaiwan Basin,which can develop good reservoir properties.In this paper,based on a vast amount of data from core drilling,rock thin sections,scanning electron microscope,electron probe and geochemistry characteristics,we study the characteristics and influencing factors of Sha 3 dolostone reservoir of Palaeogene Shahejie Formation in detail.Dolostone has four types of occurrence,including layered, nodular,massive and fracture filled.It is showed that the Sha 3dolostone reservoir rock types are mainly micrite dolostone,crystal powder dolostone and aplite dolostone.Reservoir space of Sha 3 dolostone reservoir mainly consists of dissolved intergranular pore and fractures.Dolostone reservoir is characterized by poor physical property,and the layer section with pores,caves and fractures can be performed as hydrocarbon enrichment zones.The oiliness of Sha 3 dolostone reservoir has a certain correlation with lithology and physical properties.The Sha 3 dolostone reservoir is now in the stage of mesodiagenesis,and the main diagenesis of which mainly including mechanical compaction,pressure solution,cementation, dissolution,recrystallization and dolomitization.Dissolution can be divided into three stages,and the latter two stages of dissolution lead to improve physical properties of dolostone reservoirs,while mechanical compaction and cementation result in the reducing of physical properties.Geochemistry characteristics reveal two types of dolomitization:penecontemporneous seepage reflux dolomitization and deep buried diagenetic dolomitization.Physical property of dolostone reservoir is mainly influenced by sedimentary environment,dolomitization and fracture development.Sedimentary environment plays a decisive role on the quality of dolostone reservoir and dolomitization plays an important role on the modification of reservoir space.Huge amount of fractures improves physical properties and enhances the reservoir capability of dolostone reservoir.关键词
白云岩/储层特征/影响因素/北塘凹陷/渤海湾盆地Key words
dolostone/reservoir characteristics/influencing factors/Beitang Sag/Bohaiwan Basin引用本文复制引用
曲长伟,林春明,蔡明俊,程远忠,王兵杰,张霞..渤海湾盆地北塘凹陷古近系沙河街组三段白云岩储层特征[J].地质学报,2014,(8):1588-1602,15.基金项目
国家自然科学基金资助项目（编号41272124）资助的成果。 （）
