|
|
|
| The application of wide field electromagnetic method to shale gas exploration in Wuling Mountain area: A case study of Tongzi area in northern Guizhou |
LI Di-Quan1,2,3( ), WANG Zhen-Xing1,2,3, HU Yan-Fang1,2,3, WANG Han1,2,3, SU Yu-Di1,2,3 |
1.School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
2.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha 410083, China
3.Key Laboratory of non-ferrous and geological hazard detection, Changsha 410083, China |
|
|
|
|
Abstract After the major breakthrough in oil and gas was obtained from the Well Anye 1, the Ministry of Natural Resources increased the residual shale gas and oil and gas exploration and development of 7,800 square kilometers in the Wuling Mountain. The Wulong Mountain area has complex geological structures, undulating terrain and large areas of carbonate rock, which has led to great challenges to traditional oil and gas exploration methods based on seismic exploration. Wide field electromagnetic method has the characteristics of green, high efficiency and low cost, and hence has become one of the powerful methods for oil and gas exploration and is now being widely used in shale gas exploration in southern China. It is a favorable method for shale gas exploration in southern China. The strata in Tongzi Guizhou are relatively stable, and the organic carbon content in the upper Ordovician Wufeng-Lower Silurian Longmaxi Formation is high. Through surface sample collection and well logging data analysis, the organic shale in this formation shows obvious low resistivity characteristics, which has the physical conditions of electromagnetic exploration. The wide field electromagnetic method was used to carry out shale gas exploration in Tongzi area of northern Guizhou, which overcame the complex influence of topography, carbonate rocks and structure. It is found that the structure pattern of Tongzi area is characterized by "depression and uplift" from northeast to southwest. The spatial distribution characteristics of the Wufeng-Longmaxi Formation in the target layer were detected, and four favorable areas for shale gas exploration were delineated. The prediction of shale gas exploration target area by wide area electromagnetic method is expected to help realize the breakthrough of shale gas exploration and development from point to surface in Wuling Mountain area and promote the development of clean energy industry along the river.
|
|
Received: 06 December 2019
Published: 26 October 2020
|
|
|
|
|
|
|
Layout of survey line in study area
|
|
Layout of field source in study area
|
|
Stratum specimen resistivity measurement chart
|
|
Resistivity logging curves
|
| 地层 | 主要岩性 | 范围/(Ω·m) | 平均值/(Ω·m) | 电性特征 | | 茅口组(P1m) | 灰岩 | 15.2~99 909.2 | 8 853.1 | 高阻 | | 栖霞组(P1q) | 灰岩、灰色黏土岩 | 8.6~15 714.7 | 2 074.4 | 高阻 | | 韩家店组(S1h) | 页岩、泥质砂岩、碎屑灰岩 | 11.3~176.1 | 39.7 | 低阻 | | 小河坝组(S1x) | 泥质石英粉砂岩夹页岩 | 17.9~88.1 | 29.1 | 低阻 | | 龙马溪组(S1l) | 泥质灰岩、钙质页岩互层、灰黄色页岩、黑色炭质页岩 | 4.4~96.8 | 25.2 | 低阻 | | 五峰组(O3w) | 泥质灰岩、黑色炭质页岩 | 7.1~73. 1 | 21.7 | 低阻 | | 临湘组(O3l) | 泥质灰岩 | 99.8~3 345.1 | 926.7 | 中高阻 | | 宝塔组(O2b) | 龟裂纹灰岩 | 606.6~4 595.7 | 1 661.1 | 高阻 | | 十字铺组(O2sh) | 微粒灰岩、泥质灰岩 | 987.5~8 080.6 | 2 212.1 | 高阻 |
|
Statistical table of physical properties of Wufeng-Longmaxi Formation and surrounding rocks
|
|
Raw data graph of L6 line (a) and quasi-seismic profile of L6 line(b)
|
|
Equal frequency apparent resistivity curve of L6 line
|
|
Inversion cross-section of L6 line(a) and seismic interpretation section(b)
|
|
Geological interpretation profile of line L6
|
|
Relationship between gas content, TOC(a) and apparent resistivity(b) of Wufeng Formation—Longmaxi Formation in Well Dingye3
|
|
Target area resistivity (a), buried depth (b), comprehensive favorable area prediction result in exploration area (c)
|
| [1] |
张金川, 金之钧, 袁明生. 页岩气成藏机理和分布[J]. 天然气工业, 2004,7(9):15-18,131-132.
|
| [1] |
Zhang J C, Jin Z J, Yuan M S. Reservoiring mechanism of shale gas and its distribution[J]. Natural Gas Industry, 2004,7(9):15-18,131-132.
|
| [2] |
李建忠, 吴晓智, 郑民, 等. 常规与非常规油气资源评价的总体思路、方法体系与关键技术[J]. 天然气地球科学, 2016,27(9):1557-1565.
|
| [2] |
Li J Z, Wu X Z, Zheng M, et al. General philosophy,method system and key technology of conventional and unconventional oil & gas resource assessment[J]. Natural Gas Geoscience, 2016,27(9):1557-1565.
|
| [3] |
董大忠, 王玉满, 李新景, 等. 中国页岩气勘探开发新突破及发展前景思考[J]. 天然气工业, 2016,36(1):19-32.
|
| [3] |
Dong D Z, Wang Y M, Li X J, et al. Breakthrough and prospect of shale gas exploration and development in China[J]. Natural Gas Industry, 2016,36(1):19-32.
|
| [4] |
彭安钰. 贵州黔北地区页岩气的勘探前景[J]. 中国石油和化工标准与质量, 2017,37(10):67-69.
|
| [4] |
Peng A Y. Prospects for shale gas exploration in Qianbei area of Guizhou[J]. China Petroleum and Chemical Standards and Quality, 2017,37(10):67-69.
|
| [5] |
张鹏, 张金川, 雷怀玉, 等. 黔北安页1井区松坎组沉积环境及其对页岩气成藏的影响[J]. 资源与产业, 2018,20(3):34-41.
|
| [5] |
Zhang P, Zhang J C, Lei H Y, et al. Sedimentary environment and its influence on shale gas accumulation of Songkan formation of Anye-1 well district in northern Guizhou[J]. Resources & Industries, 2018,20(3):34-41
|
| [6] |
滕吉文, 刘有山. 中国油气页岩分布与存储潜能和前景分析[J]. 地球物理学进展, 2013,28(3):1083-1108.
|
| [6] |
Teng J W, Liu Y S. Analysis of diatribution storage potential and prospect for shale oil and gas in China[J]. Progress in Geophysics, 2013,28(3):1083-1108.
|
| [7] |
张本杰, 韩忠勤, 张伟, 等. 贵州五峰组—龙马溪组页岩气研究进展[J]. 天然气技术与经济, 2017,11(6):19-23.
|
| [7] |
Zhang B J, Han Z Q, Zhang W, et al. Research on shale gas of Wufeng-Longmaxi formation, Guizhou Province[J]. Natural Gas Technology and Economy, 2017,11(6):19-23.
|
| [8] |
闫剑飞. 黔北地区上奥陶统五峰组—下志留统龙马溪组黑色岩系页岩气富集条件与分布特征[D]. 成都:成都理工大学, 2017.
|
| [8] |
Yan J F. The shale gas accumulation conditions and distribution characteristics of black shales in the Upper Ordovician Wufeng formation—Lower Silurian Longmaxi formation of northern Guizhou[D]. Chengdu: Chengdu University of Technology, 2017.
|
| [9] |
张乔勋, 李帝铨, 田茂军. 广域电磁法在赣南某盆地油气勘探中的应用[J]. 石油地球物理勘探, 2017,52(5):1085-1092.
|
| [9] |
Zhang Q X, Li D Q, Tian M J. Application of wide field electromagnetic method to the hydrocarbon exploration in a basin of South Jiangxi[J]. OGP, 2017,52(5):1085-1092.
|
| [10] |
李帝铨, 胡艳芳. 强干扰矿区中广域电磁法与CSAMT探测效果对比[J]. 物探与化探, 2015,39(5):967-972.
|
| [10] |
Li D Q, Hu Y F. A comparison of wide field electromagnetic method with CSAMT method in strong interferential mining area[J]. Geophysical and Geochemical Exploration, 2015,39(5):967-972.
|
| [11] |
何继善. 广域电磁测深法研究[J]. 中南大学学报:自然科学版, 2010,41(3):1065-1072.
|
| [11] |
He J S. Wide field electromagnetic sounding methods[J]. Journal of Central South University:Science and Technology , 2010,41(3):1065-1072.
|
| [12] |
何继善. 广域电磁法和伪随机信号电法[M]. 北京: 高等教育出版社, 2010.
|
| [12] |
He J S. Wide field electromagnetic method and pseudorandom signal electrical method [M]. Beijing: Higher Education Press, 2010.
|
| [13] |
刘树根, 马文辛, LUBA Jansa, 等. 四川盆地东部地区下志留统龙马溪组页岩储层特征[J]. 岩石学报, 2011,27(8):2239-2252.
|
| [13] |
Liu S G, Ma W X, Luba J, et al. Characteristics of the shale gas reservoir rocks in the Lower Silurian Longmaxi Formation,East Sichuan basin,China[J]. Acta Petrologica Sinica, 2011,27(8):2239-2252.
|
| [14] |
尹福光, 许效松, 万方, 等. 加里东期上扬子区前陆盆地演化过程中的层序特征与地层划分[J]. 地层学杂志, 2002(4):315-319.
|
| [14] |
Yin F G, Xu X S, Wan F, et al. Characteristic of seqence and stratigraphical division in evolution of upper yangtze region during Caledonian[J]. Journal of Stratigraphy, 2002(4):315-319.
|
| [15] |
索光运, 李帝铨, 胡艳芳. 基于解析雅克比矩阵的E-Ex广域电磁法一维并行约束反演[J]. 物探化探计算技术, 2019,41(1):55-61.
|
| [15] |
Suo G Y, Li D Q, Hu Y F. One-dimension parallel constrained inversion of E-Ex wide field electromagnetic method based on analytical Jacobian matrix[J]. Computing Techniques for Geophysical and Geochemical Exploration, 2019,41(1):55-61.
|
|
|
|
