中文摘要：

研究东海陆架盆地西湖凹陷中央反转构造带古近系花港组深层优势储层成岩环境和孔隙演化过程,采用薄片鉴定、扫描电镜、电子探针、包裹体分析和激光微区碳氧同位素分析等测试技术,判识花港组储层的成岩环境经历了弱碱性→弱酸性→酸性→酸碱转换→碱性→弱碱性的演变过程,储层酸性流体介质来源以有机酸为主,大气淡水淋滤为辅。定量计算恢复了花港组储层孔隙演化过程。压实作用是降低孔隙的第一重要因素,并贯穿整个地层埋藏过程;处于早晚两期碱性成岩环境之间长时间的酸性成岩环境,其溶蚀作用是花港组深层优质储层发育的最关键因素。

英文摘要：

T he evolution of porosity and diagenetic environm ent for the favorable reservoir of Paleogene H uagang Form ation in central reversal tectonic belt of Xihu sag of the E ast China Sea continental shelf basin are studied by m eans of thin section identification, scanning electronic m icroscopy, electron m icroprobe, fluid inclusion analysis and carbon ＆ oxygen isotope analysis of laser m icroprobe. It reveals th at the diagenetic environm ent of the H uagang Form aiton experience evolution processes from w eak-alkalinity, w eak-acidity, acidity, acid-alkaline transition, alkalinity to weak-alkalinity successively. The acid fluid medium is dominated by organic acid and meteoric waterplays an assistant role. The evolution processes of the reservoir porosity of the Huagang Formationare also quantitatively calculated and restored. It is indicated that compaction which lasts in the entireburial process is the primary factor of decreasing reservoir porosity. The dissolution during acidenvironment between the early and late alkaline diagenetic environment lead to the formation of deepfavorable reservoir of Huagang Formation in the study area.