江汉盆地新沟嘴组储层物性特征及其控制因素

Reservoir Physical Characteristics and Controls Of Xingouzui Formation In Jianghan Basin

古近系新沟嘴组是江汉盆地重要的含油层系,具有丰富的油气资源。但新沟嘴组地层受沉积时间长、地层埋深等客观地质条件影响,砂岩储层物性普遍较差,低孔低渗特征明显,储量动用难度大,因此低渗透储层的形成机理和优质储层的分布规律研究已成为制约新沟嘴组勘探开发的关键问题。本文依托岩心物性分析、薄片鉴定等测试分析资料,探讨了江汉盆地新沟嘴组砂岩储层物性特征及其控制因素,并进一步指出沉积相类型是控制储层物性的主要因素,其次为矿物的溶蚀及胶结作用。

The Paleogene Xingouzui Formation is an important oil-bearing stratum in Jianghan Basin and has abundant oil and gas resources.However,the formation mechanism of low permeability reservoirs and the distribution law of high quality reservoirs have become the key issue restricting the exploration and development of the Xingouzui Formation owing to its long depositional duration and its large buried depth as well as its poor physical properties of sand reservoirs and low porosity/permeability.Based on the tests and data such as core physical property analysis and thin section authentication,the physical properties and controls of the sand reservoirs in Xingouzui Formation in Jianghan Basin are discussed, and the findings indicate that the sedimentary facies type is the main factor controlling the physical properties of the reservoirs, followed by the dissolution and cementation of minerals.