东营凹陷史112区块沙三中亚段深水重力流体系精细刻画及在开发中的意义  

Fine Description of Deep-water Gravity Flow Deposits and Its Significance for Hydrocarbon Development in Middle Member 3 of Shahejie Formation in the Shi 112 Wellblock in Dongying Depression

作　　者：辛博 刘景彦[1] 陈薪凯 马骁 仲昭 XIN Bo;LIU Jingyan;CHEN Xinkai;MA Xiao;ZHONG Zhao(School of Energy Resources,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083

出　　处：《现代地质》2020年第2期321-332,共12页Geoscience

基　　金：国家自然科学基金项目(41130422)。

摘　　要：深水重力流作为一种重要的、特殊类型的沉积体系,自发现以来就得到了学术界的广泛关注,并在油气勘探中日益受到重视。东营凹陷古近系沙三中段发育深水重力流体系,综合地震、岩心、测录井等资料,对郝家油田史112区块深水重力流体系的沉积类型、特征及在不同层序中的发育演化进行了精细刻画,总结了该区重力流沉积模式,为开发区储层预测提供重要参考。研究表明,本区深水重力流体系发育于三级层序的高位域,从下至上可划分出4个四级层序(SQQ1-4),主要发育滑塌沉积、碎屑流沉积和浊流沉积3种成因类型,可识别出12种岩相组合。四级层序SQQ23时期重力流规模较小,SQQ33时期随着东营三角洲向湖盆中心推进,重力流规模扩大。滑塌沉积主要发育在三角洲前缘或前三角洲斜坡根部,在滑塌沉积前方形成碎屑流沉积,碎屑流向前搬运的过程中,逐渐转化成浊流沉积。三角洲前缘及前三角洲的浊流和碎屑流是开发井区进一步寻找储层的有利部位。As an important and special type of sedimentary system,deep-water gravity flow deposits have been widely studied since its discovery,and have been given increasingly more attention in the oil and gas exploration industry.Deep-water gravity flow system is developed in the Middle Member 3 of the Paleogene Shahejie Formation in the Dongying depression.We finely described the types and characteristics of deep-water gravity flow deposits,and the development and evolution in different sequences in the Shi 112 block(Haojia Oilfield),according to the seismic and core logging data.The gravity flow deposition pattern in this area is summarized,which provides an important reference for reservoir prediction in the developed wellblock.This study shows that the local deep-water gravity flow system is developed in the highstand system tract of third-order sequence,which comprises four fourth-order sequences(SQQ1-43)from bottom to top.The deep-water gravity flow deposits developed three major sedimentary types:slump,debris flow and turbidity current deposits.Furthermore,12 types of lithofacies are identified.The gravity flow scale was relatively small in the SQQ23 period,but expanded in the SQQ33 period with the Dongying delta progressing towards the lake basin center.Slump deposits developed mainly at the deltaic front or the root of pro-delta slope,while sandy debris flow deposits were developed at the front of the slump deposits.Debris flow may have transformed to turbidites gradually during its forward transportation process.The turbidity current and debris flow in the deltaic front and pro-delta represent favorable sites for reservoir exploration in the developed wellblock.

关 键 词：深水重力流 滑塌沉积 碎屑流沉积 浊流沉积 东营凹陷 

分 类 号：TE121[石油与天然气工程—油气勘探]