孤岛油田馆(1+2)地层划分对比与沉积模式

Strata Division/Correlation and Sedimentary Mode of Ng( 1 +2) in Gudao Oilfield

孤岛油田馆(1+2)砂层组属于河流相沉积,其纵向、横向相变迅速,砂体难以大面积追踪,本文利用河流结构单元分析法、标准层与辅助标志层控制下的“旋回—厚度”对比法,很好地解决了馆(1+2)地层的划分对比问题,其中馆(1+2)砂层组内辅助标志层的发现为地层的划分对比提供了重要的保证。根据结构单元分析、砂体的岩性特征、粒度特征、河流砂体的空间展布形态以及河流曲率的计算,对馆(1+2)河流沉积的垂向旋回性及沉积模式进行了研究。对比Miall的16种河流分类方案,孤岛油田馆(1+2)砂层组属于细粒曲流河沉积。

The sedimentary face of Ng ( 1 + 2 ) sand sets in Gudao oil field is fluvial sediment, which changes sharply in the lateral and the vertical directions. The sand body herein is somewhat difficult to track. Using the method of the architectural elements analysis, and the cycle-thickness correlation method controlled by the index bed and the assist marked bed in this paper, we settle the problem of division/ correlation of the Ng(1 +2) strata. The finding of the assist marked bed in Ng(1 + 2) sand sets offered a very important guarantee. According to the analysis of the architectural elements, the characteristic of the lithology and the granularity, the special state of the fluvial sand bodies and the calculation of the channel sinuosity, the vertical cyclicity and the sedimentary mode of the Ng(1 +2) fluvial sediment are well studied. It is quiet clear that the sand sets of the Ng( 1 +2) should be classified into a fine-graded fluvial sediment according to Miall' s 16-kind river classification schedule.