陇东地区曙光油田长6~3特低渗砂岩储层沉积特征及含油性

以录井和实验分析资料为依据,以综合研究为手段,以曙光油田长63储层为对象,对陇东地区中生界延长组长6储层沉积特征及其含油性进行了分析.认为曙光油田长63储层属于低孔特低渗砂岩储层,为进积型三角洲前缘亚相沉积,储层特征及含油性向上部变好;河口砂坝砂体是其主要和良好的储层类型.三角洲前缘主体区为良好储层的主要发育场所,也是油气的主要富集区.垂向沉积层序及其横向进积配置控制了长63储层在剖面上的组合发育及其综合特征的演变;平面沉积相带控制了长63储层沉积类型、叠合程度及岩性和物性的综合展布,进而控制了油气的分布范围.

Study on depositional features and oil-reserving capacity of Chang-63 super-low permeability sandstone reservoir of Shuguang Oilfield in eastern Gansu

The depositional features and the oil-reserving capacity of the studied reservoir are analyzed based on logging and experimental data.It is shown that,the reservoir is the sandstone reservoir with low-porosity and super-low-permeability;it is a progressive delta front deposit,its property and oil-bearing capacity becomes better from below to above;debouch bar is its main and better reservoir type.The better reservoirs develop in the delta front zone,where is also main oil-gas abundance zone.The vertical sedimentary sequence of the reservoir and its lateral progradation matching control the development of the profile combination and the evolution of the comprehensive feature of the reservoir.Plane sedimentary facies belts control the depositional types,the polymerization degree and the comprehensive show of the lithology and property of the reservoir,and then they control the range of the oil-gas distribution in the reservoir.