论文部分内容阅读
本研究区始新统—中新统地层内大套砂质岩储层发育，砂层厚度为２—３０ｍ。分析结果表明：具有一定储集和渗透能力的砂层主要分布在井深１９００—３２００ｍ（Ｃ—１井、ＣＨ—１井深度可达３６００ｍ），即花港组和龙井组，岩性以细砂岩、粉砂岩为主，还有少量中砂岩。其中的细砂岩、粉砂岩具有粒度分选好，胶结物含量低（＜１０％）、孔隙、渗透条件好（φ为１０—２８％、ｋ为＜１—１８００×１０￣（－３）ｕｍ￣２）；以次生粒间扩大孔、粒内孔、铸模孔和粘土矿物中的微孔及少量原生孔为其储集空间。胶结物以粘土矿物为主，其次为碳酸盐和氧化硅胶结物。本区砂岩体储层物性除受原始地质条件、储集岩的成份、结构、埋藏深度等控制外，同时受成岩后生作用的影响，压实作用和胶结作用使其物性降低，而骨架颗粒（长石为主）和胶结物的溶蚀改善了其储集条件。
In the Eocene-Miocene strata of the study area, the large set of sandy rock reservoirs are developed with sand thickness of 2-30m. The results show that sand reservoirs with a certain reservoir and permeability are mainly distributed in the depth of 1900-3200m (well C-1, well of CH-1 up to 3600m), namely, the Huagang and Longjing formations, with fine sandstone , Siltstone-based, there are a small amount of sandstone. The fine sandstone and siltstone have the advantages of granularity sorting, low content of cement (<10%), good pore and osmotic conditions (φ is 10-28%, k is <1-1800 × 10 -3 um ~ 2); to the secondary particles between the enlarged pores, intragranular pores, mold holes and clay minerals in the micropores and a small amount of primary pores for the storage space. Clay minerals mainly clay, followed by carbonate and silica cement. In addition to the original geological conditions, the composition, structure and burial depth of the reservoir rocks, the physical properties of the sandstone reservoir in this area are controlled by the diagenesis, compaction and cementation, while the physical properties of the framework particles Feldspar-based) and the dissolution of cement improved its storage conditions.