川南五峰组龙马溪组低阻页岩特征分析及启示

doi:10.11885/j.issn.1674-5086.2022.03.07.03

西南石油大学学报(自然科学版) ›› 2024, Vol. 46 ›› Issue (2): 26-40.DOI: 10.11885/j.issn.1674-5086.2022.03.07.03

川南五峰组龙马溪组低阻页岩特征分析及启示

黄莉莎^1,2,3, 闫建平^1,2,3, 胡兴中⁴, 郑马嘉⁵, 钟光海⁶

1. 西南石油大学地球科学与技术学院, 四川成都 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, 四川成都 610500;
3. 天然气地质四川省重点实验室, 四川成都 610500;
4. 中国石化胜利油田分公司油气勘探管理中心, 山东东营 257000;
5. 中国石油西南油气田公司, 四川成都 610041;
6. 中国石油西南油气田公司页岩气研究院, 四川成都 610041

收稿日期:2022-03-07 发布日期:2024-05-11
通讯作者: 闫建平,E-mail:yanjp_tj@163.com
作者简介:黄莉莎,1996年生,女,汉族,四川绵阳人,博士研究生,主要从事测井地质学、页岩气测井评价及应用方面的研究工作。E-mail:huanglisha05@163.com;闫建平,1980年生,男,汉族,内蒙古凉城人,教授,博士,主要从事测井地质学、岩石物理及非常规油气测井评价方面的教学与研究工作。E-mail:yanjp_tj@163.com;胡兴中,1971年生,男,汉族,山东东营人,高级工程师,硕士,主要从事油气地质储量管理与评价工作。E-mail:huxingzhong237.-slyt@sinopec.com;郑马嘉,1988年生,男,汉族,湖北黄冈人,博士,主要从事页岩气地质评价与开发规划等方面的研究工作。E-mail:ma_jiaz_cq@petrochina.com.cn;钟光海,1982年生,男,汉族,四川自贡人,高级工程师,硕士,主要从事页岩气测井岩石物理及测井处理解释评价研究工作。E-mail:Zgh_kty@petrochina.com.cn
基金资助:
国家自然科学基金(42372177)；中国石油-西南石油大学创新联合体科技合作项目(2020CX020000)；四川省科自然科学基金(2022NSFSC0287)；国家科技重大专项(2017ZX05049-004)；高等学校学科创新引智计划(111计划)(D18016)；南充市校科技战略合作项目(SXHZ017)

Characteristics Analysis and Its Enlightenment of Shale of Low Resistivity in Wufeng Longmaxi Formation in Southern Sichuan Basin

HUANG Lisha^1,2,3, YAN Jianping^1,2,3, HU Xingzhong⁴, ZHENG Majia⁵, ZHONG Guanghai⁶

1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. National Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
3. Natural Gas Geology Key Laboratory of Sichuan Province, Chengdu, Sichuan 610500, China;
4. Management Center of Oil and Gas Exploration of Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257000, China;
5. Southwest Oil and Gas Field Company, PetroChina, Chengdu, Sichuan 610041, China;
6. Research Institute of Shale Gas, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610041, China

Received:2022-03-07 Published:2024-05-11

摘要/Abstract

摘要： 川南长宁和泸州地区五峰组—龙马溪组页岩气储层存在低电阻率异常现象，且不同区域低电阻率井产气差异较大，利用物性、地球化学、X衍射、薄片、含气量、生产测试及测井曲线等资料，研究了低电阻率不同类型的特征、成因因素及其对含气性的影响。结果表明，低电阻率井和正常电阻率井的界限为15 $\Omega\cdot$m，次低电阻率井的电阻率主要在10$\sim$100 $\Omega\cdot$m；低电阻率井的曲线形态特征主要有“持续下降型”($R_{\rm t}$<5 $\Omega\cdot$m)和“先降低再回返增加型”(5$\sim$15 $\Omega\cdot$m)两种；低电阻率的成因因素主要包括有机质过成熟导致石墨化、高含水饱和度、高黄铁矿含量和高黏土矿物含量，对不同类型的电阻率降低起到不同程度的作用；“持续下降型”低电阻率井含气性普遍较差，而“先降低再回返增加型”含气性一般较好，向斜构造带底部且埋深较大的位置出现的低电阻率页岩通常为“持续下降型”，含气性和测试产能往往都不高，是低电阻率页岩气风险探勘开发特别需要注意的一种类型。

关键词: 海相页岩, 低电阻率, 川南地区, 五峰组—龙马溪组, 有机质石墨化

Abstract: There are low resistivity anomalies of shale gas reservoirs of Wufeng–Longmaxi Formation in Changning and Luzhou areas in southern Sichuan Basin, and the gas production of low resistivity wells in different areas varies greatly. Based on the data of physical properties, geochemistry, X-ray diffraction, thin section, gas content, production test and logging curve, the characteristics, genetic factors and their effects on gas content of different types of low resistivity are studied. The results indicate that the boundary between low resistivity well and normal resistivity well in shale gas reservoir is 15 $\Omega\cdot$m, and the resistivity range of sub low resistivity well is mainly 10$\sim$100 $\Omega\cdot$m. The curve shape characteristics of low resistivity well mainly include ”`continuous decline type" ($R_{\rm t}$<5 $\Omega\cdot$m) and ``first decrease and then increase type" (5$\sim$15 $\Omega\cdot$m). The origin factors of low resistivity mainly include graphitization caused by over mature organic matter, high water saturation, high pyrite content and high clay mineral content, which play a different role in the reduction of resistivity of different types; Low resistivity wells of “continuous decline" generally have poor gas content, but the “first decrease and then return to increase" generally have good gas content. The low resistivity shale at the bottom of the syncline structural belt and at a large buried depth is usually ”continuous decline", and the gas-bearing properties and test productivity are usually very low. It is a type that needs special attention in the risk exploration and development of low resistivity shale gas.

Key words: marine shale, low resistivity, southern Sichuan Basin, Wufeng Longmaxi Formation, organic matter graphitization

中图分类号:

TE122

黄莉莎, 闫建平, 胡兴中, 郑马嘉, 钟光海. 川南五峰组龙马溪组低阻页岩特征分析及启示[J]. 西南石油大学学报(自然科学版), 2024, 46(2): 26-40.

HUANG Lisha, YAN Jianping, HU Xingzhong, ZHENG Majia, ZHONG Guanghai. Characteristics Analysis and Its Enlightenment of Shale of Low Resistivity in Wufeng Longmaxi Formation in Southern Sichuan Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(2): 26-40.

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川南五峰组龙马溪组低阻页岩特征分析及启示

Characteristics Analysis and Its Enlightenment of Shale of Low Resistivity in Wufeng Longmaxi Formation in Southern Sichuan Basin

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