摘要
渤海湾盆地北大港潜山中浅层碎屑岩储层已成了重要的油气资源潜力层段,需进一步探究碎屑岩储层的特征及其发育主控因素。利用研究区中生界的岩心、岩屑、薄片、X-射线衍射、压汞及扫描电镜等实验分析测试资料,结合目的层段碎屑岩储层的岩石学特征、主要的成岩作用及储集空间特征,对研究区中生界碎屑岩储层特征及发育控制因素进行了分析。结果表明:研究区中生界碎屑岩储层以岩屑质长石砂岩和长石质岩屑砂岩为主,发育少量的岩屑砂岩和长石砂岩。储层成因过程中主要发生了压实、胶结、溶蚀和交代作用;储层压实率为21.49%~56.63%,平均为34.35%,属于中等压实-强压实阶段;储层以次生的溶蚀孔隙为主,原生孔隙及裂缝发育占比较少;储层总体表现为低孔、低渗的特点,但部分井区存在高孔、高渗层段。储层发育主要受控于沉积作用、成岩作用和构造作用。研究区中生界碎屑岩储层富砂段优势相(带)不明显,分选系数对储层孔隙大小的影响大于岩石粒度的影响;差异压实形成的异常高压是优质储层形成重要因素,溶蚀作用形成的次生孔隙是研究层段碎屑岩储层发育的关键;构造作用造成研究区中生界地层的快速埋深和形成的斜坡为各类优质储层的发育提供了条件和场所。
The shallow clastic reservoir in the buried hills of Beidagang has become an important oil and gas resource potential interval. It is necessary to further explore the characteristics of clastic reservoirs and their main controlling factors. In this paper,the experimental data of the core,cuttings,flakes,X-ray diffraction,mercury intrusion,scanning electron microscopy,etc. of the Mesozoic in the study area are used. Based on the petrological characteristics,main diagenesis and reservoir space characteristics of the clastic reservoirs in the target interval,the characteristics and developmental controlling factors of the Mesozoic clastic reservoirs in the study area were analyzed. The results show that the Mesozoic clastic reservoir in the study area is dominated by lithic feldspathic sandstone and feldspathic lithic sandstone,and a small amount of lithic sandstone and feldspar sandstone are developed. In the process of reservoir formation,compaction,cementation,dissolution and metasomatism happened;the storage lamination rate is 21.49%-56.63%,with an average of 34.35%,which belongs to medium compaction-strong compaction stage. The reservoir is dominated by secondary dissolved pores,and the primary pores and fractures are less developed. The overall performance of the reservoir is characterized by low porosity and low permeability,but some wells have high-porosity and high-permeability intervals. Reservoir development is mainly controlled by sedimentation,diagenesis and tectonic action. The dominant phase(band)of the sand-rich segment of the Mesozoic clastic reservoir in the study area is not obvious,and the influence of the separation coefficient on the pore size of the reservoir is greater than that of the rock. The abnormal high pressure formed by differential compaction is an important factor in the formation of high quality reservoirs,secondary pores formed by dissolution are the key to the development of clastic reservoirs in the study interval. The tectonic action caused the rapid burial depth and the formed slope of the Mesozoic strata in the study area,providing conditions and sites for the development of various high-quality reservoirs.
作者
李祖兵
李剑
崔俊峰
邢立平
吴雪松
LI Zu-bing;LI Jian;CUI Jun-feng;XING Li-ping;WU Xue-song(Chongqing Key Laboratory of Complex Oil and Gas Field Exploration and Development,Chongqing University of Science and Technology,Chongqing 401331,China;Langfang Branch of PetroChina Research Institute of Petroleum Exploration&Development,Langfang 065007,China;Exploration&Development Research Institute of PetroChina Dagang Oilfield Company,Tianjin 300280,China)
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2020年第1期13-25,共13页
Natural Gas Geoscience
基金
中国石油创新基金项目资助（编号：2013D-5006-0104）资助~~
关键词
北大港潜山
中生界
储层特征
控制因素
Buried hill in Beidagang
Mesozoic reservoir
Reservoir characteristics
Controlling factors
