周彦球(1981-),男,湖南耒阳人,高级工程师,博士,主要从事致密砂岩气储层岩石物理实验分析及测井评价方法研究. E-mail:yenchiu@qq.com. |
收稿日期: 2021-08-08
修回日期: 2021-11-30
网络出版日期: 2022-05-12
Gas-bearing evaluation of tight sandstone reservoir based on acoustic characteristics
Received date: 2021-08-08
Revised date: 2021-11-30
Online published: 2022-05-12
Supported by
The National Natural Science Foundation of China(41872133)
the Strategic Cooperation Project of China National Petroleum Corporation and China University of Petroleum (Beijing)
以四川盆地金华—中台山地区沙溪庙组为例,研究致密砂岩储层的声学特性在含气性识别、饱和度计算及产能预测中的应用。通过30块岩样的变饱和度声波实验,分析纵横波时差、纵横波速度比随孔隙度、含水饱和度的变化规律,形成局部增强的声速图版及线性判别边界,进而建立分段饱和度模型。经试气资料验证,改进的声速图版可有效地识别Ⅰ、Ⅱ类气层,符合率为87.5%;基于声波实验的饱和度模型仅需少量测井曲线作为输入项,简单实用,计算的含水饱和度与岩心分析一致性好。在此基础上,通过数值积分求取储层的累积含气厚度,结合试气资料分别建立直井段与水平井段的产能预测模型,其决定系数R 2分别为0.83和0.67,可有效指导研究区产能预测。还分析比较了基于Gassmann方程的声学饱和度模型,认为该类模型所需理论参数较多,不确定性较大,而且存在伪边界效应,实验数据和测井资料均证实其适用性较差。
周彦球 , 王贵文 , 江程舟 , 刘秉昌 , 解宇强 , 赖强 , 夏小勇 . 基于声学特性的致密砂岩储层含气性评价[J]. 天然气地球科学, 2022 , 33(5) : 831 -842 . DOI: 10.11764/j.issn.1672-1926.2021.12.003
Taking Shaximiao Formation in Jinhua-Zhongtaishan area of Sichuan Basin as a case, this paper makes a study on the application of acoustic characteristics of tight sandstone reservoirs in gas-bearing identification, saturation calculation and productivity prediction. Through an acoustic experiment of variable saturations of 30 rock samples, the variation laws of P- and S- wave slowness and the velocity ratio with porosity and water saturation are analyzed, and a locally enhanced acoustic velocity chart and its linear discriminant boundary are formed, and then a piecewise saturation model is established. Verified by the gas test data, the improved velocity chart can effectively identify type Ⅰ and Ⅱ gas reservoirs, with a coincidence rate of 87.5%; the saturation model based on the experiment requires only a few logs as input items, which is simple and easy, and the calculated water saturation is in good agreement with core analysis. On this basis, the “cumulative gas bearing thickness” of the reservoir is calculated by numerical integration, and combined with the gas test data, the productivity prediction models of vertical and horizontal well section are established respectively, with determination coefficients of 0.83 and 0.67, respectively, which can effectively guide the productivity prediction in the study area. The acoustic saturation model based on Gassmann equation is also analyzed and compared. This kind of model is found to require more theoretical parameters and has a greater uncertainty and pseudo boundary effect. Its poor applicability is proved by both the experiment and logging data.
“氦气资源形成、评价与开发”专辑征稿启事
氦气是高新技术产业发展不可替代的重要稀缺战略资源,广泛应用于医疗、航天、国防、核能、前沿科学研究以及高新技术产业等领域,被誉为“气体稀土”。全球可利用的氦气资源分布极不均衡,主要集中在少数国家和地区。目前,我国氦气资源需求缺口巨大,对外依存度超过95%,国家氦气资源安全形势十分严峻。当前国际形势复杂多变,我国亟待探寻具有工业开发利用价值的氦气资源,并开展相应的基础研究和技术攻关。
通常,氦气大多以微量组分与天然气伴生,同时还有大量的氦气以溶解状态存在于地下水中。我国天然气藏中氦气平均含量低,资源潜力不明;氦气聚集研究起步晚,富氦气藏成藏机理不清,勘探技术体系尚未建立;低品位氦气提取技术落后,工业化利用受限。面向我国氦气战略资源的重大需求,经过与国内外相关科研教学生产单位和专家们的广泛沟通和深入讨论,决定于2022年在《天然气地球科学》组织“氦气资源形成、评价与开发”专辑,就氦气聚集机理与资源勘探开发的相关研究及应用撰文讨论,以期开拓新的研究思路,加强学科交叉与学术创新,助力我国氦气工业的全面发展。专辑拟定于2022年末以正刊形式在《天然气地球科学》刊出。诚邀业内专家学者积极投稿。
1. 征稿范围
(1)氦气来源与赋存,包括氦源岩、氦气运移机理与过程、氦气富集条件等研究。
(2)氦气资源评价与分布规律,包括基础地质背景、地质构造与岩石结构、有利富集区带、成藏特征与模式等研究。
(3)稀有气体分析测试技术与方法,包括不同地质样品中的稀有气体测试前处理方法、稀有气体含量和同位素分析技术及应用等研究。
(4)氦气开发,包括氦气开采理论与技术、氦气提纯纯化技术、氦气资源开发经济性评价及相关环境影响等研究。
2. 征稿要求
(1)稿件类型为综述与评述、研究论文等。撰稿规范及要求可到本刊主页“下载中心”下载(http://www.nggs.ac.cn/CN/column/item158.shtml)。
(2)所有稿件编辑部均将严格按程序执行,不符合发表要求的稿件将被退回。录用后的稿件会优先在线出版。
(3)稿件基础资料、数据等信息,需符合有关单位/部门的保密要求。
3. 投稿截止日期
2022年9月30日。
4. 专辑召集人
范桥辉,研究员,中国科学院西北生态环境资源研究院
郑国东,研究员,中国科学院西北生态环境资源研究院
彭 楠,研究员,中国科学院理化技术研究所
王晓锋,教 授,西北大学
罗双江,研究员,中国科学院过程工程研究所
5. 投稿方式
登陆官网http://www.nggs.ac.cn进行投稿。投稿时请备注“氦气资源形成、评价与开发”专辑。投稿成功后请将稿件信息告知专辑联系人。
6. 专辑联系人
陶辉飞 0931-4960893 taohuifei2018@lzb.ac.cn
李 平 0931-4960831 liping@lzb.ac.cn
李 靖 0931-4960891 lj1926@lzb.ac.cn
马向贤 0931-4960815 maxxan@lzb.ac.cn
李小燕 0931-8277790 lixy@llas.ac.cn
《天然气地球科学》编辑部
2022年4月2日
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