太平油田馆陶组下段沉积特征

Sedimentary features of lower member of Guantao Formation in Taiping oilfield

太平油田馆陶组下段发育辫状河流相和低弯度河流相两种沉积相类型,其中低弯度河流相在研究区馆陶组下段为首次识别。研究区馆陶组下段Ⅴ砂组至Ⅰ砂组的发育和演化显示了沉积边界逐渐向西推进的特点。Ⅰ、Ⅱ砂组发育辫状河流相,Ⅲ、Ⅳ、Ⅴ砂组发育低弯度河流相。Ⅰ、Ⅱ砂组的有利储集区带分布于研究区中东部,Ⅲ、Ⅳ、Ⅴ砂组的有利储集区带主要集中于研究区东部。

Two sedimentary facies of braided stream facies and low-sinuosity stream facies are developed in low member of Guantao Formation in Taiping oilfield. For the first time, low-sinuosity stream faeies is identified in studied area. Development and evaluation of sediments from No. Ⅴ to No. Ⅰ sand groups indicate the characteristics of depositional boundaries advancing towards the west of studied area gradually. Braided stream facies developed in No. Ⅰ and No. Ⅱ sand group, and low-sinuosity stream facies developed in No. Ⅲ, No. Ⅲ and No. Ⅴ. The favorable reservoir belts of No. Ⅰ and No. Ⅱ sand groups lie in the central east part of studied area, and those of No. Ⅲ, No. Ⅳ and No. Ⅴ sand group centralize the east part.