苏里格气田苏东27—36密井网区山1段沉积微相研究

Study on sedimentary microfacies of Shan 1 section of 27—36 dense drilling zone in eastern part of Sulige Gas Field

对苏里格气田苏东27—36密井网区山1段进行精细解剖,以沉积旋回为依据的地层精细划分与统一对比,对达单期河流旋回的沉积时间单元微相精细刻画,建立了86口井6个沉积时间单元的层序地层格架。通过取心井岩心观察山1段岩石学特征为主要发育灰绿色粗砂岩、灰绿色中砂岩和绿灰色细砂岩,碎屑组分主要为石英、长石和辉石,碎屑粒度较粗、分选较差,结构成熟度较低。沉积构造特征为主要发育槽状交错层理和水平层理,也可以看出隐平行层理等;层面构造主要为岩性突变面,单个层内普遍为正粒序特征。说明山1段为河流相沉积环境,根据不同沉积微相特征建立研究区9种微相的测井相模式,包括分流河道、决口河道、废弃河道、溢岸砂和泛滥平原泥等沉积微相,为以后的气田开发和储层特征研究奠定了基础。

The eastern part of Sulige 27—36 dense drilling zone Shan 1 fine anatomy,according to sedimentary cycles based on stratigraphic division and unification of the sedimentary unit of single cycle river microfacies fine description,established the sequence of 86 wells in 6 sedimentary unit layer framework,through core observation mountain petrological characteristics of 1 section for mainly developed the greyish green gritstone,gray green sandstone and green gray fine sandstone,debris is mainly composed of quartz,feldspar and pyroxene,coarse clastic,poor sorting,low structure maturity. The sedimentary structures are mainly characterized by trough shaped cross bedding and horizontal bedding,and hidden parallel bedding can also be seen. The stratum structure is mainly the lithologic abrupt change surface,and the single layer is generally characterized by positive grain ordering. For the description of fluvial depositional environment 1 mountains,according to the different characteristics of sedimentary microfacies of study area were built 9 microfacies logging facies,including distributary channel,crevasse channel,abandoned channel,overbank sand and flood plain mud microfacies,for future field development and the research of reservoir characteristics laid the foundation.