摘要
通过岩芯观察、测井相分析、沉积相剖面和砂体平面展布分析,认为苏里格气田苏120区块盒8段属浅水辫状河三角洲平原亚相沉积,但是各小层分流河道砂体发育程度不同。盒81上小层辫状分流河道发育程度低,呈似曲流河状,属弱辫状化分流河道类型;盒81下小层、盒82下小层、盒82上小层辫状分流河道发育程度高,呈现宽条带状,属强辫状化分流河道类型。对比两者的区别,最终建立辫状化程度不同的浅水辫状河三角洲沉积模式。同时,对该区盒8段分流河道(砂体)进行中心线叠合处理,得出分流河道砂体的演化既存在继承性又存在迁移性的规律,继承性表现为不同小层分流河道的数量和大体位置较稳定,迁移性表现为分流河道始终向两侧迁移,包括东移、西移和往返3种侧向迁移方式。
Based on core observation, analysis of electrofacies, sedimentary facies section and sand body distribution, the eighth member of Shihezi Formation of Block Sul20 in Sulige gas field pertains to shallow braided river delta sub- facies. However, the development degrees of different distributary channel sand bodies are different. He8^1_upper section develops low degree, which shows the meandering river-like shape and pertains to the style of poorly braided distributary channe ;He8^1_lower section, He8^2_lower section and He8^2_upper section develop high degree, which shows the banded shape and pertains to the style of greatly braided distributary channel. By comparing these two styles, the sedimentary mod- els of braided river deltas with different braid-shaped level are established. Meanwhile, by superimposing the center line of distributary channel sand bodies of the eighth member of Shihezi Formation in this area, the inheritance and migration rules of the development of distributary channel sand bodies are obtained. The inheritance presents that the amount and location of distributary channels of different sections almost remain the same. The migration presents that distributary channels always migrate towards either side, including 3 kinds of lateral migration, namely, eastward, westward, back and forth.
出处
《沉积学报》
CAS
CSCD
北大核心
2013年第2期340-349,共10页
Acta Sedimentologica Sinica
关键词
苏里格气田
苏120区块
盒8段
浅水辫状河三角洲
沉积演化
Sulige Gas Field
Blok Su120
the eighth member of Shihexizi Formation（ He8 ）
shallow-water braidedriver delta
sedimentary evolution
