摘要
砂质辫状河储层内部发育不同类型的夹层,其分布对底水油藏水平开发至关重要。以渤海海域典型油田X油田馆陶组NgⅢ砂层为研究对象,在岩电识别及精细对比基础上,区分对开发影响较大的单砂体间夹层和随机分布的心滩内夹层。期次对比表明,油层段主要存在三期单砂体间夹层,早期局部以冲刷泥砾为主,钻井呈现频率小、平面分布范围小的特点;中期夹层频率大,冲刷泥砾、泛滥平原细粒物质与坝间细粒物质串联形成了似层状夹层,能明显抑制水平井的含水上升,而以河道滞留沉积为主晚期夹层频率大、宽度小,与河道内部多期充填泥岩共同作用造成水平井呈现供液不足的现象。依据夹层分布特征及时改变策略,通过调整井分层系开发实践取得了非常好的开发效果。
The sandy braided river reservoirs has different types of interbeds inside, and their distribution is critical to the horizontal well development of bottom water reservoirs. Based on the study of core-logging identification and fine correlation, the interbeds between single sand body and that randomly distributed in channel bars which have large influence on the development have been distinguished in a case study of NgⅢ formation of X oilfield in Bohai sea. The correlation results show that there are three main interbeds between single sand body in the oil layer.The early interbeds are mainly scour mud pebble with small drilling frequency and distribution range. The secondary interbeds are a stratiform-like interlayers formed by scour mud pebble and fine particles from the flood plain or the inter-bar in series, with large drilling frequency which can significantly inhibit the water rise of horizontal wells.While the late interbeds are mainly channel retention sediment with large frequency and small width. The combination of these interbeds and the multi-stage filling mudstone within the river create the phenomenon of insufficient fluid supply in horizontal wells. The oilfield changes strategy in a timely manner according to the characteristics of interbed distribution and it has achieved very good development effect by practice of hierarchical development of adjustment well.
作者
汪巍
李博
孙恩慧
彭琴
郭敬民
WANG Wei;LI Bo;SUN Enhui;PENG Qin;GUO Jingmin(CNOOC China Limited,Tianjin Branch,Tianjin 300452,China)
出处
《石油化工应用》
CAS
2019年第3期96-100,共5页
Petrochemical Industry Application
基金
"十三五"国家科技重大专项"渤海油田加密调整及提高采收率油藏工程技术示范"
项目编号:2016ZX05058001
关键词
辫状河
夹层
水平井
冲刷泥砾
分层系开发
braided river
interbed
horizontal well
scour mud pebble
hierarchical development
