摘要
为了探究鄂尔多斯盆地庆阳地区沉积岩层生氦量对氦气储量的贡献,采用自然伽马测井技术,通过探测地层中U、Th、K的天然放射性强度反映岩石放射性元素丰度,结合岩心取样与实验室能谱分析标定U、Th元素含量并拟合自然伽马测井值,进而计算氦气生成量,利用“放射性元素丰度—生氦速率—累积量”逻辑链评价潜在氦源岩生氦潜量,结合23口井的测井资料及地层厚度、密度、面积数据定量评估研究区主要沉积岩氦气资源生成总量,并与常规组分法对比。研究结果表明:①不同岩性生氦潜量为铝土岩>泥岩>砂岩,不同层位生氦潜量表现为太原组>山2段>盒8段≈山1段;②庆阳地区盒8段与山1段砂岩层位氦气生成量总和为0.911×10^(8) m^(3),山2段泥岩层位为11.116×10^(8) m^(3),太原组铝土岩层为4.431×10^(8) m^(3),总和为1.646×10^(9) m^(3),合水及其周边地区生氦潜力较高;③山1段砂岩层计算生氦潜量略高于实测氦气含量,太原组铝土岩段计算值与实测量较接近,盒8段计算值明显低于实测值,研究层段沉积岩系整体产生的氦气量高于庆阳气田实测氦气量;④成因法可量化氦气资源生成量,能预测未开发区资源,降低勘探风险,但对数据依赖性高,可能高估资源量,组分法可直接计算可采资源量,但无法动态评估气藏和预测未开发层位。结论认为,沉积岩系生成的氦气能够成为供氦的主要氦源岩,成因法基于氦气资源成因机制解析可较精确计算理论资源量,可用于初步预测氦气勘探优选区。
To explore the contribution of helium generation from sedimentary rocks to helium reserves in the Qingyang area of the Ordos basin,natural gamma logging technology is used to reflect the abundance of radioactive elements in rocks by detecting the natural radioactive intensity of U,Th and K in the formation.Combined with core sampling and laboratory energy spectrum analysis,the contents of U and Th elements are calibrated and the natural gamma logging values are fitted to calculate the helium generation amount.The logical chain of"radioactive element abundance—helium generation rate—cumulative amount"is used to evaluate the helium generation potential of potential helium source rocks.Logging data from 23 wells,along with data on formation thickness,density,and area,are used to quantitatively assess the total helium resource generation from major sedimentary rocks in the study area,which is compared with the conventional component method.The research results show that:①The helium generation potential of different lithologies is bauxite>mudstone>sandstone,and that of different horizons is Taiyuan formation>Shan 2 member>He 8 member≈Shan 1 member.②The total helium generation from sandstone horizons of He 8 member and Shan 1 member in the Qingyang area is 0.911×10^(8) m^(3),that from mudstone horizon of Shan 2 member is 11.116×10^(8) m^(3),that from bauxite horizon of Taiyuan formation is 4.431×10^(8) m^(3),with a total of 1.646×10^(9) m^(3),and the Heshui area and its surrounding regions have high helium generation potential.③The calculated helium generation potential of sandstone in Shan 1 member is slightly higher than the measured helium content,the calculated value of bauxite in Taiyuan formation is close to the measured value,the calculated value of He 8 member is significantly lower than the measured value,and the total helium generated by the sedimentary rock series in the study interval is higher than the measured helium content in the Qingyang gas field.④The genetic method can quantify the helium resource generation,predict resources in undeveloped areas,and reduce exploration risks,but it is highly dependent on data and may overestimate resources,the component method can directly calculate recoverable resources but cannot dynamically evaluate gas reservoirs or predict undeveloped horizons.It is concluded that the helium generated by the sedimentary rock series can be the main helium source rock.The genetic method,based on the analysis of the genetic mechanism of helium resources,can calculate the theoretical resource amount more accurately and can be used for preliminary prediction of favorable helium exploration areas.
作者
唐敏
郝乐伟
康锐
范立勇
李小燕
马晓峰
陶辉飞
TANG Min;HAO Lewei;KANG Rui;FAN Liyong;LI Xiaoyan;MA Xiaofeng;TAO Huifei(Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710018,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi'an,Shaanxi 710018,China)
出处
《测井技术》
2025年第4期565-579,共15页
Well Logging Technology
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”(2021ZG13)
中国科学院“西部之光”人才培养引进计划资助项目。
关键词
地质评价
氦气资源评价
自然伽马测井
生氦潜量
鄂尔多斯盆地
庆阳地区
沉积岩
geological evaluation
helium resource evaluation
natural gamma logging
helium generation potential
Ordos basin
Qingyang area
sedimentary rock
