牛圈湖油田西山窑Ⅱ砂组沉积特征及有利区预测  

Depositional features of sand group Ⅱ in Xishanyao Formation and Prediction of Favorable Regions in Niujuanhu Oilfield

作　　者：文静 张娜 姚孟多 刘俊田 杨志刚 

机构地区：[1]成都理工大学,四川成都610059 [2]中国石油吐哈油田分公司,新疆哈密839009

出　　处：《特种油气藏》2017年第5期21-26,共6页Special Oil & Gas Reservoirs

基　　金：中国石油科技重大专项"中小型叠合盆地石油地质条件整体评价及勘探技术研究"(2012E-34-04)

摘　　要：针对三塘湖盆地牛圈湖油田西山窑组油藏岩性横向变化快,沉积微相控藏明显的特点,基于油田上产急需精细沉积微相支持的现状,综合运用岩心、录井、测井、地震、岩石薄片等资料,对牛圈湖油田西山窑Ⅱ砂组沉积微相进行了精细研究。研究认为:牛圈湖油田西山窑Ⅱ砂组主要发育辫状河三角洲前缘亚相,次为前辫状河三角洲亚相。研究区的南缘较陡,发育冲积扇、辫状河三角洲及湖泊等沉积体系,在坡度较缓的北缘发育辫状河三角洲直接入湖的沉积体系。通过地震资料、薄片鉴定及重矿物分析,认为储层砂体由南北物源控制,且东区具有以南部物源为主的特点,而并非前人认识的以北部物源为主。在东北、西北和南部划分出3个优势储层区,其可作为下一步勘探开发的目标区。Aiming at the features of fast reservoir lithology changes and apparent control effect of sedimentary micro- facies on hydrocarbon accumulation of the Xishanyao Formation in the Niujuanhu Oilfield of the Santanghu Basin, based on the requirement of oilfield production increase supported by fine sedimentary mierofacies, we comprehen- sively applied cores, mud logging, well logging, seismic data and rock slices etc. to finely study the sedimentary microfacies of the sand group II in the Xishanyao Formation of the Ninjuanhu Oilfield. The study results indicate that the sand group I1 in the Xishanyao Formation of the Niujuanhu Oilficld mainly develops braided river delta front subfacies, followed by front braided fiver delta subfacies. The south margin of the study area is relatively steeper, with deposit systems of alluvial fans, braided river delta and lacustrine, etc. The north margin is relatively gentler, with deposit system of directly entering lake of the braided river delta. According to analysis of seismic data, rock slices and heavy minerals, it concludes that the reservoir sand bodies are controlled by northern and southern prove- nances, and the east is mainly controlled by the southern provenance （ not the northern provenance that was consid- ered by previous researchers）. Three predominant reservoir regions are divided in its northeast, northwest and south areas~ and they can act as the future exploration and development targets.

关 键 词：辫状河三角洲相 物源 沉积体系 有利区预测 山西窑组 牛圈湖油田 

分 类 号：TE122.2[石油与天然气工程—油气勘探]