中国地质2024，Vol.51Issue(1)：73-88,16.DOI:10.12029/gc20210802002
鄂尔多斯盆地西部古峰庄地区三叠系延长组裂缝特征及其对低渗透油藏的控制作用
Fracture characteristics of Triassic Yanchang Formation in the Gufengzhuang Area,Western Ordos Basin and its control on low permeability reservoirs
摘要
Abstract
This paper is the result of oil-gas exploration engineering. [Objective]The Triassic Yanchang Formation in the Gufengzhuang area of the western Ordos Basin develops low-permeability reservoir with abundant natural fractures,and few investigations have focused on the features of the fractures that are of great significance for the exploration and development of low-permeability reservoirs.[Methods]In this paper,by means of fracture identification from the outcrops,cores,imaging logging,scanning electron microscope and fluid inclusion,fault activity and tectonic stress analysis,the fracture characteristics and influence on low permeability reservoirs are studied.[Results]The results show that natural fractures are all developed in each Member of the Yanchang Formation,with Chang 7 being the most developed Member,followed by Chang 8 and Chang 6 Members.The fracture mainly orients in the NEE direction,secondly in the NE direction,and lastly in the NW and NWW directions.Calcite filling and obvious oil migration marks can be seen on the surfaces of the cracks.The development degree of natural fractures is closely related to the thickness of rock layers and intensity of fault activity.Comprehensive analysis of the fluid inclusions in fractures,faults and tectonic activities shows that the formation period of fractures is multi-stage,mainly in the Yanshanian and Himalayan periods.[Conclusions]The development of natural fractures has improved the porosity and permeability and reservoir space of low-permeability reservoirs in the study area,and provided favorable conditions for oil migration,accumulation and enrichment in low-permeability reservoirs.The development degree and formation period of natural fractures affect the reservoir forming and productivity of low-permeability reservoirs.关键词
延长组/裂缝特征/形成期次/低渗透油藏/古峰庄地区/油气地质/油气勘查工程/鄂尔多斯盆地Key words
Yanchang Formation/fracture characteristics/formation stages/low-permeability reservoir/Gufengzhuang area/petroleum geology/oil-gas exploration engineering/Ordos Basin分类
天文与地球科学引用本文复制引用
郭惠,黄雷,赵红格,陈江萌,邵晓州,刘池洋,王建强,雷琳琳,李俊,汪建..鄂尔多斯盆地西部古峰庄地区三叠系延长组裂缝特征及其对低渗透油藏的控制作用[J].中国地质,2024,51(1):73-88,16.基金项目
国家自然科学基金项目(42072170,41972153,42230815),大陆动力学国家重点实验室团队项目(201210132),陕西省高校青年创新团队(盆地演化与能源矿产)项目及中国石油天然气股份有限公司长庆油田分公司勘探开发研究院项目(ZY19-XA412-FW1216)联合资助.Support by the projects of National Natural Science Foundation of China(No.42072170,No.41972153,No.42230815),State Key Laboratory of Continental Dynamics(No.201210132),Youth Innovation Term of Shaanxi University(Basin Evolution and Energy Minerals),Exploration and Development Research Institute Project of Changqing Oilfield Company of China National Petroleum Corporation(No.ZY19-XA412-FW1216). （42072170,41972153,42230815）
