塔河油田石炭系砂层划分对比及横向预测

Division and lateral prediction of Carboniferous sand in Tahe Oilfield

塔河油田石炭系是该区未来增储上产的主要目的层之一 ,纵向上可划分为 3个层序 ,4个岩性段。其中 ,石炭系主要油气产层段卡拉沙依组可进一步划分为 5个砂层组 ,各砂层组地震地质特征有别。利用地震反演及可视化技术经综合研究发现 ,卡拉沙依组下部Ⅴ ,Ⅳ及Ⅲ砂层组以潮坪相为主 ,砂层多为透镜体 ,横向连通性差 ,单层厚度小 ,累积厚度大 ;上部Ⅱ及Ⅰ砂层组以多期辫状河三角洲沉积为主 ,砂体单层厚度相对较大 ,平面分布广 ,横向连通性好 ,具有较好的勘探前景。

The Carboniferous formation of Tahe oilfield, which is one of the main targets for reserves enlargement and production enhancement, could be divided into three sequences and four lithological segments. Among which the sand interval of Carboniferous Karashayi member could be divided into five sand segments of different seismic and geologic characters. The Ⅴ, Ⅳ, and Ⅲ sand segments are mainly lenticular bodies of tidal-flat facies, characterized by laterally poor continuity, thin single sand layer and great cumulative thickness, whereas the Ⅱ and Ⅰ sand segments are mainly deltaic deposits of braided channels, characterized by relatively great single layer, laterally good continuity, and wide distribution. Therefore the Ⅱ and Ⅰ sand segments are favorable prospects.