摘要
以渤南北带沙三-沙四段砂砾岩储层为例,结合岩心、测井资料,利用铸体薄片、扫描电镜、CT扫描等方法,研究砂砾岩储层特征及发育主控因素。结果表明:沙三-沙四段砂砾岩储层储集空间主要为溶蚀孔、粒间孔、贴砾缝和微孔,储层物性整体偏差,具有低孔低渗的特征;储层孔隙演化与成岩演化密切相关,早成岩阶段压实作用导致孔隙减少,中成岩阶段受不稳定组分的溶蚀,溶蚀孔成为砂砾岩储层的主要储集空间;砂砾岩储层主要受控于原始组分和溶蚀作用,其中富含不稳定组分的火山岩岩屑是物质基础,有机酸的溶蚀作用是储层发育的关键;受大颗粒支撑作用影响,在扇中的细砾岩相中局部存在弱压实带,原始孔隙发育,为后期酸性流体进入提供通道,溶蚀孔隙更发育,距离边界断层1~2 km的扇中是优质储层发育区。该结果对研究区砂砾岩储层特征研究具有借鉴意义。
Taking the glutenite reservoirs in the the E s 3-E s 4 of the Shahejie Formation in the northern zone of Bonan as an example.The characteristics of the glutenite reservoirs and the main controlling factors are studied in combination with core data,logging data,casting thin section,scanning electron microscope,and CT scan.The results show that the reservoir spaces of glutenite reservoirs in the E s 3-E s 4 are mainly dissolution pores,intergranular pores,gravel joint and microporosity,the physical properties of the reservoir are poorly;the pore evolution of the reservoir is closely related to the diagenetic evolution,and the compaction in the early diagenetic stage leads to the decrease of pore space,the dissolution of unstable components in the middle diagenetic stage makes the dissolution pores become the main reservoir space of the glutenite reservoirs in this area.The glutenite reservoirs in this area are mainly controlled by the original components and dissolution,in which the unstable intermediate acid volcanic rock fragments are the material base,and the dissolution of organic acid is the key to the development of the reservoirs.The particles supporting fine conglomerate lithofacies in the mid-fan,due to the support of large particles,have weak compaction zone in some parts,and the original pores are developed,which provides a channel for the flow of acid water in the later stage,and the dissolution pores are more developed.The mid-fan with a distance of 1-2 km from the boundary fault is a high-quality reservoir development area.The results can be used for reference in the study of reservoir characteristics of glutenite.
作者
胡鑫
丁晓琪
张歆妍
李雷
汪孝敬
HU Xin;DING Xiaoqi;ZHANG Xinyan;LI Lei;WANG Xiaojing(Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Urumqi,Xinjiang 830013,China;College of Energy,Chengdu University of Technology,Chengdu,Sichuan 610059,China;School of Geosciences and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China)
出处
《东北石油大学学报》
CAS
北大核心
2021年第1期55-61,94,I0004,I0005,共10页
Journal of Northeast Petroleum University
基金
国家自然科学基金项目(41302115)
四川省教育厅重点项目(16ZA0089)。
关键词
砂砾岩储层
储层特征
主控因素
沙三-沙四段
渤南北带
glutenite reservoirs
reservoir characteristics
main controlling factors
E s 3-E s 4
northern zone of Bonan
