鄂尔多斯盆地氦气特征及生成潜力  

Helium characteristics and potential in the Ordos Basin

作　　者：惠洁 康锐[1,2] 赵伟波[1,2] 范立勇[1,2] 贾丽 季海锟[1,2] 王宇菲 HUI Jie;KANG Rui;ZHAO Weibo;FAN Liyong;JIA Li;JI Haikun;WANG Yufei(Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi’an 710018,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi’an 710018,China)

机构地区：[1]中国石油长庆油田公司勘探开发研究院,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018

出　　处：《天然气地球科学》2024年第9期1688-1698,共11页Natural Gas Geoscience

基　　金：中国石油天然气股份有限公司关键核心项目“氦气资源评价与低成本提氦及运储关键技术研究”(编号:2021ZG13)资助。

摘　　要：近年来鄂尔多斯盆地的勘探显示,其具有良好的氦气资源潜力,但对氦气分布特征及资源量认识薄弱,限制了对氦气富集规律的认识及后续的勘探工作。针对该问题,系统开展了鄂尔多斯盆地长庆气区氦气含量、分布特点及资源量评价研究。结果表明:庆阳气田、宜川气田以及苏里格气田西部均呈现出工业氦和富氦的特点,其中庆阳气田氦气含量范围为0.121%~0.204%(平均为0.144%),宜川气田氦气含量范围为0.060%~0.177%(平均为0.086%),苏里格气田氦气含量范围为0.018%~0.168%(平均为0.053%);而榆林气田、靖边气田、神木气田和子洲—米脂气田的氦气含量普遍比较低,平均含量为0.034%。氦气多富集于盆地周缘地区,盆地中心氦气浓度最低,在纵向上则表现出二叠系最高、奥陶系最低的特点。新建立的氦气资源量评价方法计算表明,盒8段和山1段储层原位生成的最大氦气量分别为6.27×10^(6) m^(3)和1.39×10^(6) m^(3),分别占其实测氦气储量的52.69%和3.11%,表明有外来源区氦的输入。鄂尔多斯盆地西南部的产氦单元有变质基底、沉积层系和印支期岩浆岩3类,所能生成的氦气量分别为2.14×10^(10)m^(3)、1.44×10^(10)m^(3)和1.74×10^(7) m^(3),总氦气生成量约为358×10^(8) m^(3)。Recent exploration has shown that the Ordos Basin has a good potential of helium resource.However,its distribution and resource calculation method are still controversial,which impede the understanding of the helium enrichment rule and subsequent exploration in the Ordos Basin.Therefore,we systematically studied the Changqing oilfield helium contents,distributions,and its resources.The results show that helium in Qingyang,Yichuan and western Sulige gas fields are above the industrial and enriched helium standards,which have the helium contents of 0.121%-0.204%(averagely 0.144%),0.060%-0.177%(averagely 0.086%)and 0.018%-0.168%(averagely 0.053%),respectively.In contrast,Yulin,Jingbian,Shenmu,and Zizhou-Mizhi gas fields generally have relatively lower helium concentrations(averagely 0.034%).Such distribution characteristics reveal that the content of helium in the margin of the basin is higher than that of the center.Vertically,the highest helium appears in the Permian and the lowest appears in the Ordovician.According to the new established helium resources evaluation method,the calculated in-situ helium production of He-8 and Shan-1 reservoirs is 6.27×10^(6) m^(3) and 1.39×10^(6) m^(3) respectively,accounting for 52.69%and 3.11%of the total helium production,which means the external source rocks is the main contributing source area of helium.The helium production of the metamorphic basement,sedimentary sequences,and Indosinian magmatic plutons in the southwestern margin of the basin is 2.14×10^(10) m^(3),1.44×10^(10) m^(3),and 1.74×10^(7) m^(3),respectively,with total helium resources of about 358×10^(8) m^(3).

关 键 词：氦气 鄂尔多斯盆地 资源量评价 庆阳气田 

分 类 号：TE121[石油与天然气工程—油气勘探]