安塞砖窑湾地区长6_1储层成岩作用及成岩相特征研究

Study on Characteristics of the Chang 6_1 Reservoir Diagenesis and Diagenetic Facies in Zhuanyaowan-Ansai Area

通过观察大量岩心、铸体薄片、扫描电镜,结合样品测试数据做综合分析。在沉积环境和沉积框架下系统地分析与研究安塞砖窑湾地区长61砂岩储层成岩作用类型、成岩阶段以及成岩相。认为研究区长61储层为一套浅水三角洲前缘亚相沉积,主要发育水下分流河道、分流间湾微相,储层主要岩性为长石砂岩、岩屑长石砂岩,结构和成分成熟度中等。其成岩阶段处于中成岩A期的晚期阶段。可划分为5个成岩相,物性由好到坏依次是绿泥石胶结-溶孔残余粒间孔相、水云母胶结-粒间孔-溶蚀孔相、碳酸盐胶结-弱溶蚀孔相、浊沸石胶结-弱溶蚀孔相、压溶-压实相。不同成岩相的划分对于研究区储层评价以及生产具有一定指导意义。

In the comprehensive large numbers of cores,casting lamellas,scanning electron microscopes（ SEM） and sample test data. On the basis of the sedimentary environment and the sedimentary framework,we are systematically analyzed the diagenesis,diagenesis process and diagenetic phases of the Chang 61 reservoir in Zhuanyaowan- Ansai area. We think the 61 reservoir is a set of shallow water delta front subfacies deposition,the main development of the underwater distributary channel,distributary bay microfacies,The main lithology is feldspar sandstone and lithic feldspar sandstone,and it have medium maturity of structure and composition. Its sandstone mainly in late stage of middle diagenetic A stage. It can be divided into five diagenetic facies,its properties from good to bad is： Chlorite cementation solution pores- residual intergranular pore facies. Illite cementation intergranular pore- dissolution pore facies. carbonate cementation- week dissolution pore facies. laumonite cementation- weak dissolution pore facies,pressolution and compaction facies. It has certain guiding significance for evaluation of reservoir and production.