徐深气田兴城地区营四段的沉积特征及成因

Sedimentary characteristics and cause of conglomerate in Ying-4 segment of Xushen gas field

兴城地区营城组四段砾岩储层为徐深气田主要储层之一.通过岩心观察和描述,结合普通薄片、铸体薄片、扫描电镜等资料,对营四段砾岩沉积特征进行了研究.营四段砾岩沉积的总体特征为巨厚的灰绿色颗粒支撑块状层理(火山)中砾岩;营四段砾岩的成因为向辫状河三角洲过渡的“浅的砾质辫状河型扇三角洲相”.

This paper discusses conglomerate reservoir of Yingcheng group 4 section , which is one of the main reservoirs in Xingcheng area. Ying 4 section conglomerate reservoir are studied based on subtle core observation, plentiful rock thin-section identification, cast thin-section picture statistic analyses, scanning electron microscope observation and Feature data of conglomerate pore structure by mercury injection method. The collectivity character of conglomerate sediment in Ying 4 section is a very thick celadon massive bedding conglomerate which is grain supported. This paper discusses the macro depositing character of conglomerate of Ying-4 segment. With this foundation, we regard the cause of conglomerate in Ying-4 segment as, transiting to braided river delta, braided-river fan-delta which is shallow and conglomerate, and classify it to three kind of Sedimentary subfacies.