摘要
前人针对鄂尔多斯盆地延长组沉积特征及储层非均质性进行了大量的研究,但储层非均质性仍制约油气的勘探开发。综合岩心观察、粒度分析、测井相及地震相等信息,通过建立高分辨率层序地层格架,划分沉积微相,系统研究鄂尔多斯盆地华庆地区长63亚段沉积微相特征及对储层非均质性的控制作用。结果表明,华庆地区长63亚段发育深水重力流沉积体系,可划分为砂质碎屑流、泥质碎屑流、浊流、滑塌四种微相类型。其中砂质碎屑流为最重要的微相之一,其形成机理包括整体冻结、摩擦固结及悬浮沉降。沉积微相的展布控制储层平面的非均质性,长63亚段优质储层主要位于砂质碎屑流、浊积岩的主体部位,进而导致储层平面的非均质性。深水重力流砂体垂向叠置厚度大,可形成规模较大的油藏,长63亚段油层组砂质碎屑流砂体发育在河道的主体部位,厚度较大、储集层物性较好;隔夹层发育少、连通性好,是重点勘探层位。
Previous studies on the sedimentary characteristics and reservoir heterogeneity of Yanchang formation in Ordos basin have been carried out,but the reservoir heterogeneity still restricts the exploration and development of oil and gas.Based on the information of core observation,grain size analysis,logging facies and seismic facies,the sedimentary microfacies of Chang 63 in Huaqing area of Ordos basin are systematically studied by establishing high resolution sequence stratigraphic framework and dividing sedimentary microfacies.The results indicate that the deep-water gravity flow sedimentary system developed in Chang 63 of Huaqing area can be divided into four microfacies types:sandy debris flow,muddy debris flow,turbidity flow and slump.Among them,the sand debris flow is one of the most important microfacies,and its formation mechanism includes overall freezing,friction consolidation and suspension settlement.The distribution of sedimentary microfacies controls the plane heterogeneity of reservoir.The high-quality reservoir of Chang 63 is mainly located in the main part of sandy clastic flow and turbidite,which leads to the plane heterogeneity of reservoir.The vertical stack thickness of gravity flow sand body in deep water is large,which can form largescale reservoir.The sandy clastic flow sand body of the Chang 63 reservoir group is developed in the main part of the river channel,with large thickness and good reservoir physical properties.The interlayer is less developed and well connected,which is the key exploration horizon.
作者
阮昱
王超
代超
RUAN Yu;WANG Chao;DAI Chao(School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;No.2 Gas Production Plant of Changqing Oilfield Company,PetroChina,Xi'an,Shaanxi 710200,China;N0.11 Oil Production Plant of Changqing Oilfield Company,PetroChina,Qingyang,Gansu 745000,China)
出处
《石油地质与工程》
CAS
2020年第2期1-7,共7页
Petroleum Geology and Engineering
基金
“十三五”国家科技重大专项“中生界低渗透储层非均质性评价技术”(2016ZX05050006)。
关键词
华庆地区
长63亚段
沉积微相
重力流
储层非均质性
Huaqing area
Chang 63
sedimentary microfacies
gravity flow
reservoir heterogeneity
