西湖凹陷YQ构造深部储层成岩作用与成藏关系

Relationship between Diagenesis and Hydrocarbon Accumulation in Deep Reservoir of YQ Structure, Xihu Sag

陈琳琳 李昆 黄龙泽

CHEN Linlin LI Kun HUANG Longze

中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院, 上海 200120

Institute of Exploration and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

从龙井运动对地层成岩演化的影响，探讨了东海西湖凹陷YQ构造花港组储层成岩环境酸碱性条件变化下溶蚀作用、胶结作用以及自生黏土矿物的转化。从流体势角度分析了YQ构造胶结强于溶蚀的成岩现状，从颗粒接触关系揭示了压实作用主导了花港组深层储层物性，认为龙井运动前酸性溶蚀不足造成次生孔隙较少，而石英次生加大较少造成抗压实能力较弱，龙井运动之后碱性胶结作用较强致使储层孔渗性进一步变差。

Based on the effect of Longjing Movement on the diagenesis evolution in the reservoirs of Huagang Formation in YQ structure, the authors discussed dissolution, cementation and transformation of clay minerals under different diagenetic environment of acid and alkaline, analyzed the cause of the current situation that the cementation is stronger than the dissolution from the point of fluid potential, and indicated that the compaction dominated the physical properties of deep reservoirs based on the analysis of particle contact relationship. It is concluded that Longjing Movement played an important role in the diagenesis evolution. Before Longjing Movement, there were scarce secondary pores developed because of insuffcient acid dissolution and the less quartz secondary enlargement also lead to the weak ability to resist the compaction. After Longjing Movement, the physical properties of reservoirs were deteriorated by the strong cementation under alkaline environment.

https://doi.org/10.3969/j.issn.1008-2336.2016.04.014