苏里格地区南部盒8段沉积相特征

Characteristics of Sedimentary Facies in the 8th Member of Shihezi Formation of South Sulige Gas Field

根据苏里格地区沉积背景,应用研究区取心井盒8段岩心观察及分析化验资料,对盒8段储层岩石学特征、原生的泥岩颜色、粒度特征以及沉积构造等相标志进行综合分析,确定苏里格南部盒8段气藏为辫状河三角洲沉积体系。在区内划分出辫状河道、河漫沼泽和水下分流河道等沉积微相,并指出区块有利的沉积相带为辫状河道和水下分流河道微相,储层砂体分布规律受河道的走向及延伸距离的控制。该成果为苏里格南部盒8段气藏优质储层的预测指出方向,也为气藏勘探开发方案的制定提供了地质依据。

According to the regional depositional setting of Sulige gas field, facies signs of the reservoir in the 8th member of Shi- hezi formation, such as lithological characteristics, color of original mudstone, grain size and sedimentary structures, were com- prehensively analyzed by fully utilizing the available core observation and laboratory test data of the block. It is believed that the gas reservoir in the 8th member of Shihezi formation in south Sulige gas field is braided river delta facies, which is further subdivi- ded into several sedimentary microfacies,including braided river channel, flood swamp, underwater distributary channel, etc. The braided river channel and underwater distributary channel microfaeies are favorable sedimentary facies belts in the research area and the distribution of reservoir sandbodies are decided by the direction and extended distance of channels. It provides a geolog- ical basis for reservoir prediction and further exploration and development planning of the gas reservoir in the 8th member of Shi- hezi formation in south Sulige gas field.