西湖凹陷中央反转构造带花港组致密砂岩储层成岩环境演变与孔隙演化  

Evolution of pore and diagenetic environment for the tight sandstone reservoir of Paleogene Huagang Formation in the central reversal structural belt in Xihu sag,East China Sea

作　　者：徐国盛[1] 徐芳艮 袁海锋[1] 丁圣斌 百成钢 周瑞琦[2] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]四川省煤田地质工程勘察设计研究院,成都610072

出　　处：《成都理工大学学报（自然科学版）》2016年第4期385-395,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金项目(41372141);"十三五"国家重大科技专项(2016ZX05027002-006)

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。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.

关 键 词：西湖凹陷 反转构造带 花港组 成岩环境 孔隙演化 

分 类 号：TE122.23[石油与天然气工程—油气勘探] P588.21[天文地球—岩石学]