摘要
为弄清清水洼陷沙河街组致密砂岩储层控制因素,揭示致密储层“甜点区”分布规律,利用岩心、薄片及扫描电镜等资料,探讨了沙三段储层的岩石学特征、储层物性特征及储集空间类型,从岩石的粒度、成分、分选及其成岩作用等方面分析了致密储层的控制因素。结果表明,研究区储层主要发育长石岩屑砂岩、岩屑长石砂岩和长石砂岩3种类型;储层的物性较差,发育原生孔隙和次生孔隙;储层的发育特征主要受沉积作用和成岩作用的影响,沉积环境决定了砂岩沉积过程中的水动力条件,并对砂岩的岩石学特征和原生孔隙的发育程度具有一定的影响;成岩作用中溶蚀作用产生的次生孔隙,是控制储层的主要因素。
To clarify the controlling factors of the tight sandstone reservoir in the Shahejie Formation of the Qingshui Sub-sag and reveal the distribution pattern of the"sweet spot area"of the tight reservoir,data such as core samples,thin sections,and scanning electron microscopy were used,the petrology characteristics,reservoir physical properties,and reservoir space types of the Es3 reservoir were explored.The controlling factors of the tight reservoir were analyzed from the aspects of rock particle size,composition,sorting,and diagenesis.The results show that the reservoirs in the study area mainly develop three types of feldspar rock debris sandstone,rock debris feldspar sandstone,and feldspar sandstone;the physical properties of the reservoirs are poor,and the primary pores and secondary pores are developed;the development characteristics of reservoirs are mainly influenced by sedimentation and diagenesis.The sedimentary environment determines the hydrodynamic conditions during sandstone sedimentation and has a certain impact on the petrological characteristics of sandstone and the degree of development of primary pores.The secondary pores generated by dissolution during diagenesis are the main factors controlling reservoirs.
作者
文慧俭
崔家正
何谞超
Wen Huijian;Cui Jiazheng;He Xuchao(NEPU Sanya Offshore Oil&Gas Research Institute,Sanya 572025,China;School of Earth Sciences,Northeast Petroleum University,Daqing 163318,China;Fangxing Company,Daqing Oilfield,Daqing 163458,China)
出处
《能源与环保》
2025年第5期1-6,12,共7页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
海南省科技专项资助(ZDYF2024GXJS015)。
关键词
清水洼陷
致密砂岩
溶蚀作用
控制因素
Qingshui Sub-sag
tight sandstone
dissolution process
controlling factors
