阿尔金山前带东段基岩储层主要特征及评价  

Main Characteristics and Evaluation of Bedrock Reservoirs in the Eastern Segment of Altun Piedmont

作　　者：李欣 谢庆宾[1,2] 牛花朋[1,2] 张永庶 李俊巍 吴志雄 李传龙 席斌 王波 袁翰林 Li Xin;Xie Qingbin;Niu Huapeng;Zhang Yongshu;Li Junwei;Wu Zhixiong;Li Chuanlong;Xi Bin;Wang Bo;Yuan Hanlin(State Key Laboratory of Petroleum Resource and Prospecting,Beijing 102249,China;College of Geosciences,China University of Petroleum,Beijing 102249,China;Exploration and Development Institute of Qinghai Oilfield Company,Petro China,Dunhuang,Gansu 736202,China)

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油大学地球科学学院,北京102249 [3]中国石油青海油田勘探开发研究院,甘肃敦煌736202

出　　处：《地球科学》2020年第2期617-633,共17页Earth Science

基　　金：国家科学自然基金项目“辉绿岩热液作用对围岩储层的影响机理研究”(No.41272162);中国石油天然气股份有限公司重大科技专项“柴达木盆地建设高原大油气田勘探开发关键技术研究与应用”(No.2016E-0102).

摘　　要：为了解阿尔金山前带东段基岩储层主要特征,对储层进行评价.在野外露头踏勘、岩心观察描述、薄片鉴定及相关分析测试的基础上,结合普通测井资料、成像测井资料及孔渗密实验数据等进行分析.结果表明,阿尔金山前带东段基岩储层岩性主要是岩浆岩和变质岩,岩浆岩以花岗岩为主,变质岩以片麻岩为主.储集空间类型主要包括未完全充填裂缝、溶蚀孔洞和基质微孔3类.基岩储层孔隙度介于0.004%~9.760%,平均孔隙度在1.663%~3.844%;渗透率介于最大值0.002~33.239mD,平均渗透率在0.020~3.836 mD,片麻岩类物性整体好于花岗岩类,孔隙度和渗透率之间没有明显的相关性.基岩储层主控因素包括岩性及矿物组合、古地貌、先存断裂及破碎带、后期岩浆侵入及热液作用4个方面.结合基岩储层的物性特征及形成的主控因素,建立了多因素控制的基岩储层评价标准,将储层分为好、中等、较差、差4类.评价结果表明,研究区多以Ⅱ类储层为主,主要见于花岗片麻岩,其次是花岗岩、黑云母斜长片麻岩等.东坪鼻隆、牛中-牛北斜坡可见Ⅰ类储层;尖北斜坡、牛东鼻隆、冷北斜坡多为Ⅱ类储层.Based on the field outcrop survey,core observation,section identification,scanning electron microscopy and cathodoluminescence method,combined with conventional logging,image logging,pore infiltration test data,etc.,main characteristics and evaluation of bedrock reservoirs in the eastern segment of the Altun Piedmont were studied.The results show that the lithology of the bedrock reservoirs in the eastern segment of Altun Piedmont mainly includes magmatic rocks and metamorphic rocks.The magmatic rocks are mainly granite,and the metamorphic rocks are mainly gneiss and schist.The types of reservoir space mainly include incompletely filled fractures,dissolved pores and matrix micropores.The maximum porosity of bedrock reservoir is 9.76%,the minimum is 0.004%,and the average is 1.663%~3.844%.The maximum permeability of bedrock reservoir is 33.239 mD,the minimum is 0.002 mD,and the average permeability is 0.020~3.836 mD.There is no obvious correlation between porosity and permeability.The main controlling factors of bedrock reservoirs include lithology and mineral combination,paleogeomorphology,pre-existing faults and fracture zones,late magmatic intrusion and hydrothermal action.Combined with the physical properties and the main controlling factors of the bedrock reservoir,the evaluation criteria of bedrock reservoir controlled by many factors are put forward.The reservoir is divided into four categories:good,average,fair,and poor.The results of evaluation show that the study area is mainly composed of typeⅡreservoirs,mainly found in granitic gneiss,followed by granite,plagioclase gneiss,feldspar hornblende schist,etc.The Dongping nasal and Niuzhong-Niubei slopes are mostly type I reservoirs,the Jianbei slope,Niudong nasal and Lengbei slope are mostly typeⅡreservoirs.

关 键 词：基岩储层 储集空间 主控因素 储层评价 阿尔金山前带东段 油气地质 

分 类 号：P618.13[天文地球—矿床学]