辫状河三角洲前缘厚油层细分——以新街油田台7断块为例

针对新街油田台7断块泰一段二砂层组厚油层内非均质性严重、产能不均匀等问题,对其进行了精细的地质研究.综合利用岩心、测井资料,结合沉积微相分布,对比厚油层的砂体剖面和岩电特征,认为厚油层内主要为泥质夹层和物性夹层,建立了夹层的电性、物性识别标准,以夹层空间分布面积为标准找到1个稳定夹层,依据该稳定夹层将厚油层进一步细分为2个单层,将厚油层的非均质性降低到一个相对均质的单元,并总结了辫状河三角洲前缘水下分流河道砂体细分对比模式和规律.

Subdivision of the thick oil layer of braided river delta front:taking Tai 7 fault block in Xinjie Oilfield as an example

The detailed geological study of the thick oil layer in the second sand group of Tai 1 member(K2t1) in Tai 7 fault block were carried out because of its strong heterogeneity and uneven productivity.According to the study on core and logging data,microfacies distribution,sand stone profile and lithology-electric property,it is held that there are mainly muddy interlayers and physical-property interlayers in the thick oil layer.The identification criterions of the electrical property and physical property of the interlayers are established.A stable interlayer is found firstly by taking the distribution area of the interlayers as identification criterion,and it will divide a thick oil layer into 2 thinner layers.Two thinner layers will be more heterogeneous.The contrast modes and laws for the subdivision of braided river delta front sandbodies are obtained by the example.