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鄂尔多斯盆地陇东地区长7层沉积微相及沉积演化特征
投稿时间:2019-05-23  修订日期:2019-10-12  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020112
摘要点击次数: 37
全文下载次数: 37
作者单位E-mail
张晓辉 长庆油田分公司勘探开发研究院低渗透油气田勘探开发国家工程实验室 zxh1987_cq@petrochina.com.cn 
冯顺彦 长庆油田分公司勘探开发研究院低渗透油气田勘探开发国家工程实验室  
梁晓伟 长庆油田分公司勘探开发研究院低渗透油气田勘探开发国家工程实验室  
冯胜斌 长庆油田分公司勘探开发研究院低渗透油气田勘探开发国家工程实验室  
毛振华 长庆油田分公司勘探开发研究院低渗透油气田勘探开发国家工程实验室  
任继胜 中国石油集团渤海钻探工程有限公司第二录井分公司  
陈韶华 中国石油集团渤海钻探工程有限公司第二录井分公司  
基金项目:十三五”国家油气重大专项《致密油富集规律与勘探开发关键技术》(2016ZX05046)
中文摘要:利用大量的岩芯、露头剖面观察和测井资料,在总结分析重力流沉积理论的基础上,系统研究了鄂尔多斯盆地陇东地区延长组长7段重力流沉积特征及沉积模式。研究认为陇东长7段主要发育砂质碎屑流和浊流沉积,局部发育滑动、滑塌岩;受多物源、湖盆底形、湖岸线迁移等因素的影响,研究区沉积砂体并未呈现出明显的扇形,受西南陡窄斜坡控制的泾川—华池一带砂体呈条带状分布,发育水道型重力流沉积,沉积微相可分为限制型水道、非限制型水道、侧翼溢漫、水道间、前缘朵体和深湖泥6种,在湖盆底庆城—华池一带多期水道交汇叠置,形成了大面积的连片砂体;受南部物源控制的宁县—合水地区,由于斜坡坡度相对较缓、物源供给充足,形成了以滑塌为主的斜坡沉积模式,根据滑动的距离可分为近源沉积和远源沉积2个亚相,沉积微相可分不规则滑塌体、砂质碎屑流舌状体、朵叶状浊流岩和深湖泥4种,研究区南部主要以砂质碎屑流舌状体为主,在斜坡处多期舌状体纵横叠置,形成了多期薄、厚砂体互层的连片砂体。通过对陇东长7段沉积模式的建立和沉积微相的识别与划分,为研究区砂体展布的精细刻画提供了重要指导,也为该区致密油水平井规模建产提供了依据。
中文关键词:延长组长7段 致密油 重力流沉积 砂体成因类型 重力流水道 沉积模式
 
Sedimentary microfacies and sedimentary evolution characteristics of Chang 7 Member of Yanchang Formation in Longdong area, Ordos basin
Author NameAffiliationE-mail
ZHANG Xiaohui Exploration and Development Research Institute of PetroChina Changqing Oilfield CompanyNational Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields zxh1987_cq@petrochina.com.cn 
FENG Shunyan Exploration and Development Research Institute of PetroChina Changqing Oilfield CompanyNational Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields  
LIANG Xiaowei Exploration and Development Research Institute of PetroChina Changqing Oilfield CompanyNational Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields  
FENG Shengbin Exploration and Development Research Institute of PetroChina Changqing Oilfield CompanyNational Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields  
MAO Zhenhua Exploration and Development Research Institute of PetroChina Changqing Oilfield CompanyNational Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields  
REN Jisheng No.2 Mud Logging Branch Company, CNPC Bohai Drilling Engineering Co. Ltd  
CHEN Shaohua No.2 Mud Logging Branch Company, CNPC Bohai Drilling Engineering Co. Ltd.  
Abstract:On the basis of summarizing and analyzing the theory of gravity flow sedimentation, the sedimentary characteristics and sedimentary model of the Chang 7 Member of Yanchang Formation in Longdong area of Ordos Basin are systematically studied by using a large number of core, outcrop profile observation and logging data. It is considered that sandy debris flow and turbidity current deposits are mainly developed in Chang 7 Member of Longdong, and slip and slump rocks are locally developed. Affected by multiple sources, lake basin bottom shape and lake shoreline migration, the sedimentary sand bodies in the study area do not show obvious fan-shaped. Sandbodies in Jingchuan-Huachi area controlled by steep and narrow slopes in southwest China distribute in strips, and channel-type gravity flow deposits are developed, and sedimentary microfacies is divided into six types: restricted channel, unconfined channel, flank overflow, inter-channel, leading edge lobate sand and deep lake mud. At the bottom of the lake basin, Qingcheng-Huachi waterway intersects and overlaps, forming a large area of connected sand bodies. In Ningxian-Heshui area controlled by Southern provenances, due to relatively gentle slope gradient and abundant provenance supply, a slope sedimentation model dominated by slump structure is formed. According to the slip distance, it can be divided into two subfacies: near-source sedimentation and far-source sedimentation. The sedimentary microfacies can be divided into four types: irregular slumping, sandy debris flow tongue, lobate turbidite and deep lake mud. In the southern part of the study area, sandy debris flow tongue is the main body, and the tongue body overlaps vertically and horizontally in many stages on the slope, forming a large area of continuous sand body of thin and thick sand Interbedding. Through the establishment of sedimentary model and identification and division of sedimentary microfacies of Chang 7 Member in Longdong, it provides important guidance for fine characterization of sand body distribution in the study area, and also provides basis for scale production of tight oil horizontal wells in the area.
keywords:Chang 7 Member of Yanchang Formation  tight oil  gravity flow deposition  genetic types  gravity flow channel  depositional model
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