川南长宁地区奥陶系五峰组—志留系龙马溪组页岩气储层低电阻率响应特征及主控因素

doi:10.12108/yxyqc.20240303

岩性油气藏 ›› 2024, Vol. 36 ›› Issue (3): 31–39.doi: 10.12108/yxyqc.20240303

川南长宁地区奥陶系五峰组—志留系龙马溪组页岩气储层低电阻率响应特征及主控因素

程静^1,2, 闫建平^1,2, 宋东江³, 廖茂杰⁴, 郭伟⁵, 丁明海⁶, 罗光东⁶, 刘延梅⁷

1. 西南石油大学地球科学与技术学院, 成都 610500;
2. 油气藏地质及开发工程全国重点实验室·西南石油大学, 成都 610500;
3. 山东瑞霖能源技术有限公司, 山东东营 257000;
4. 中国石油西南油气田公司, 页岩气研究院, 成都 610500;
5. 中国石油勘探开发研究院, 北京 100083;
6. 中国石油大庆油田公司钻探工程公司, 黑龙江大庆 163712;
7. 斯伦贝谢科技服务(成都)有限公司, 成都 610095

收稿日期:2023-04-29 修回日期:2023-06-24 出版日期:2024-05-01 发布日期:2024-04-30
第一作者:程静（1998—），女，西南石油大学在读硕士研究生，研究方向为数字岩石物理、测井地质学、页岩气测井评价及应用。地址:（610500）四川省成都市新都区西南石油大学地球科学与技术学院。Email:chengjing2706@163.com。
通信作者: 闫建平（1980—），男，博士，教授，主要从事测井地质学及非常规油气测井评价方面的教学与研究工作。Email:yanjp_tj@163.com。
基金资助:
国家科自然科学基金项目“低电阻率页岩气储层：成因机制差异及含气饱和度模型研究”（编号：42372177）、四川省自然科学基金项目“页岩气储层低电阻率成因机制及对含气性的影响研究”（编号：2022NSFSC0287）联合资助。

Low resistivity response characteristics and main controlling factors of shale gas reservoirs of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Changning area，southern Sichuan Basin

CHENG Jing^1,2, YAN Jianping^1,2, SONG Dongjiang³, LIAO Maojie⁴, GUO Wei⁵, DING Minghai⁶, LUO Guangdong⁶, LIU Yanmei⁷

1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
2. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Southwest Petroleum University), Chengdu 610500, China;
3. Shandong Ruilin Energy Technology Co., Ltd., Dongying 257000, Shandong, China;
4. Research Institute of Shale Gas, PetroChina Southwest Oil & Gas Field Company, Chengdu 610500, China;
5. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
6. Drilling Engineering Company, PetroChina Daqing Oilfield Company, Daqing 163712, Heilongjiang, China;
7. Schlumberger Technology Service(Chengdu) Co., Ltd., Chengdu 610095, China

Received:2023-04-29 Revised:2023-06-24 Online:2024-05-01 Published:2024-04-30

摘要/Abstract

摘要： 以川南长宁地区 NX22 井五峰组—龙马溪组低电阻率页岩气储层为例，利用岩心矿物组分、扫描电镜、总有机碳（TOC）含量、含水饱和度测试及测井曲线等资料，确立了低电阻率页岩气储层岩石体积物理模型，采用随机法构建了三维数字岩心模型，进而利用有限元数值模拟方法模拟计算各矿物组分含量、含水饱和度及有机质石墨化的电阻率响应特征，并分析其主控因素。研究结果表明：①长宁地区五峰组—龙马溪组低电阻率页岩气储层岩石体积物理模型由骨架（石英、长石、方解石和白云石等）、黏土矿物、黄铁矿、未石墨化有机质以及石墨化有机质、孔隙 6 个部分组成。②三维数字岩心模型的长、宽、高分别为 100×100×100 像素，融入了上述物理模型中的 6 个部分，并采用不同的颜色对导电组分进行标识，可以显示不同方向上的切片，表征低电阻率页岩气储层的组分特性。③黏土矿物含量、黄铁矿含量、含水饱和度以及有机质石墨化程度等 4 个参数增大都会造成页岩气储层的电阻率下降，而有机质的高石墨化程度（25%）和高含水饱和度（88.0%）使页岩气储层的电阻率从正常电阻率（大于 15 Ω·m）降到低阻甚至超低阻（小于 5 Ω·m），是导致研究区页岩气储层超低阻响应的 2 个核心因素。

关键词: 低电阻率, 页岩气储层, 数字岩心, 有限元方法, 导电因素, 含水饱和度, 有机质石墨化程度, 黏土矿物, 黄铁矿含量, 奥陶系五峰组—志留系龙马溪组, 川南长宁地区

Abstract: Taking low resistivity shale gas reservoirs of Wufeng Formation-Longmaxi Formation of well NX22 in Changning area in southern Sichuan Basin as an example, the data of core mineral composition, scanning electron microscope, total organic carbon（TOC）content, water saturation test and logging curves were used to establish a rock volume physical model of low resistivity shale gas reservoirs. A three-dimensional digital core model was constructed by random method, and the resistivity response characteristics were simulated under different mineral components content, water saturation and organic matter graphitization by finite element numerical simulation method, and the main controlling factors were analyzed. The results show that:（1）The rock volume physical model of low resistivity shale gas reservoirs of Wufeng Formation-Longmaxi Formation in Chang-ning area consists of six parts:skeleton（quartz, feldspar, calcite and dolomite）, clay minerals, pyrite, ungraphitized organic matter, graphitized organic matter and pores.（2）The 3D digital core is of 100×100×100 pixels in length, width, and height, respectively. It integrates the six parts of the physical model mentioned above, and uses different colors to identify the conductive components. It can display slices in different directions to characterize the composition characteristics of low resistivity shale gas reservoirs.（3）An increase in clay mineral content, pyrite content, water saturation and organic matter graphitization degree can cause a decrease in the resistivity of shale gas reservoirs. However, the high degree of organic matter graphitization（25%）and high water saturation （88.0%）cause the resistivity of shale gas reservoirs to decrease from normal resistivity（greater than 15 Ω·m）to low or even ultra-low resistivity（less than 5 Ω·m）, which are the two core factors leading to the ultra-low resistivity response of shale gas reservoirs in the study area.

Key words: low resistivity, shale gas reservoir, digital core, finite element method, conductive factor, water saturation, organic matter graphitization degree, clay minerals, pyrite content, Ordovician Wufeng FormationSilurian Longmaxi Formation, Changning area in Sichaun Basin

中图分类号:

TE348

程静, 闫建平, 宋东江, 廖茂杰, 郭伟, 丁明海, 罗光东, 刘延梅. 川南长宁地区奥陶系五峰组—志留系龙马溪组页岩气储层低电阻率响应特征及主控因素[J]. 岩性油气藏, 2024, 36(3): 31–39.

CHENG Jing, YAN Jianping, SONG Dongjiang, LIAO Maojie, GUO Wei, DING Minghai, LUO Guangdong, LIU Yanmei. Low resistivity response characteristics and main controlling factors of shale gas reservoirs of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Changning area，southern Sichuan Basin[J]. Lithologic Reservoirs, 2024, 36(3): 31–39.

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川南长宁地区奥陶系五峰组—志留系龙马溪组页岩气储层低电阻率响应特征及主控因素

Low resistivity response characteristics and main controlling factors of shale gas reservoirs of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Changning area，southern Sichuan Basin

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