摘要
为了明确柴达木盆地阿尔金山前尖顶山地区基岩的储层特征,综合利用岩心、岩石薄片、压汞曲线、工业CT、扫描电镜、测井等资料,系统开展了岩石学、矿物学、储集空间类型、裂缝发育特征以及含气控制因素等方面的研究。结果表明:①尖北基岩以块状杂色石英闪长岩和花岗闪长岩为主,储集空间类型包括风化淋滤溶蚀孔、基质微孔、裂缝及缝内溶孔。②基岩裂缝可分为2种类型,一类为2期成因的构造缝,另一类为成岩解理缝,二者均受基底断裂控制。③基岩风化淋滤带储层的储集空间类型包括风化淋滤形成的溶蚀孔和裂缝,大孔喉和小孔喉均发育,以小孔喉为主,连通孔径多为1~5μm。距基岩顶的距离决定了储层质量的好坏。④裂缝溶蚀带储层的储集空间类型包括裂缝和缝内溶孔,地质历史时期的构造活动程度控制了储层质量。该研究成果对基岩风化壳的油气勘探具有借鉴意义。
In order to clarify the bedrock reservoir characteristics of Jianding Mountain area in front of Altun Mountain in Qaidam Basin,the petrology,mineralogy,reservoir space type,fracture development characteristics and gas-bearing controlling factors were systematically studied by using core data,rock section,mercury injection curve,industrial CT,scanning electron microscopy and logging data.The results show that:(1)The bedrock in Jianbei area is mainly composed of massive variegated quartz diorite and granodiorite,and the reservoir spaces include weathering leaching dissolved pore,matrix micropore,fracture and dissolved pore in fracture.(2)Bedrock fractures can be divided into two types,one is structural fracture with 2-stage genesis,the other is diagenetic cleavage fracture,both of which are controlled by basement fracture.The reservoir spaces of the weathering and leaching zone of bedrock include dissolved pores and fractures formed by weathering and leaching.Both macropore throat and micro-pore throat are well developed,but the micro-pore throat is main.The connection pore diameter is mostly 1-5μm.The distance from the top of bedrock determines the quality of reservoir.The reservoir spaces of fracture dissolution zone include fractures and dissolved pores in fracture.The structural activity in geological history period controls the reservoir quality.The research results can be used for reference in oil and gas exploration of weathered crust of bedrock.
作者
陈更新
王建功
杜斌山
刘应如
李艳丽
杨会洁
李志明
俞晓峰
CHEN Gengxin;WANG Jiangong;DU Binshan;LIU Yingru;LI Yanli;YANG Huijie;LI Zhiming;YU Xiaofeng(PetroChina Research Institute of Petroleum Exploration and Development-Northwest,Lanzhou 730020,China;Research Institute of Exploration and Development,PetroChina Qinghai Oilfield Company,Dunhuang 736200,Gansu,China)
出处
《岩性油气藏》
CSCD
北大核心
2020年第4期36-47,共12页
Lithologic Reservoirs
基金
国家科技重大专项“天然气地球物理烃类检测、评价技术及应用”(编号:2016ZX05007-006)资助。
关键词
花岗闪长岩
裂缝
溶蚀孔
基岩气藏
尖北地区
柴达木盆地
granodiorite
fracture
dissolved pore
bedrock gas reservoir
Jianbei area
Qaidam Basin
作者简介
陈更新(1984-),男,博士,工程师,主要从事油气田开发和沉积储层方面的研究工作。地址:(730020)甘肃省兰州市城关区雁儿湾路535号。Email:chen_gx@petroChina.com.cn。
