大地电磁测深在湘东南坳陷页岩气勘探中的应用
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摘要
为了解湘东南坳陷西南部地区深部构造特征,以及泥盆系—二叠系主要页岩气层系的分布、岩性等特征,以袁家向斜为研究对象,开展了4条大地电磁测深剖面资料的处理和定性、定量分析。通过对大地电磁测深资料的视电阻率拟断面、阻抗相位分析及二维连续介质反演,结合研究区的地质和物性特征,大致查明了剖面上主要断裂的位置、性质及发育特征,圈定了主要地质层系(电性层)的空间展布,并在此基础上探讨了该地区页岩气勘探的有利层系。研究成果表明:袁家向斜内部的断裂以SN向、NE向和NW向断裂为主,在剖面上多表现为铲式或坡坪式的构造样式;二叠系龙潭组发育优质含气性煤层,具有较好的煤层气勘探前景;泥盆系棋梓桥组下段低阻页岩连续且厚度大,可作为有利勘探页岩层系。
To understand the deep structure characteristics and the distribution and lithology of the main Devonian-Permian shale gas strata on the southwestern side of Southeast Hunan Depression,the authors carried out the processing and qualitative-quantitative analysis of data from four magnetotelluric sounding profiles in Yuanjia syncline. Based on the apparent resistivity section,impedance phase analysis and two-dimensional continuous media inversion of magnetotelluric sounding data and combined with the geological characteristics and physical properties of the study area,the authors found out the location,nature and development characteristics of main fractures as well as the spatial distribution of the main geological formation( electrical layer). On such a basis,the favorable shale gas strata exploration was discussed. The results show that the majority of the faults trend in SN,NE and NW directions in the Yuanjia syncline,showing structures such as " listric style" and " flat and ramp style" in the section. The Upper Permian Longtan Formation has high quality gas-bearing coalbed and good exploration prospect of coalbed methane. The low resistance shale of the lower member of Middle Devonian Qiziqiao Formation is continuous and thick,and hence it can be regarded as a favorable exploration shale formation.
To understand the deep structure characteristics and the distribution and lithology of the main Devonian-Permian shale gas strata on the southwestern side of Southeast Hunan Depression,the authors carried out the processing and qualitative-quantitative analysis of data from four magnetotelluric sounding profiles in Yuanjia syncline. Based on the apparent resistivity section,impedance phase analysis and two-dimensional continuous media inversion of magnetotelluric sounding data and combined with the geological characteristics and physical properties of the study area,the authors found out the location,nature and development characteristics of main fractures as well as the spatial distribution of the main geological formation( electrical layer). On such a basis,the favorable shale gas strata exploration was discussed. The results show that the majority of the faults trend in SN,NE and NW directions in the Yuanjia syncline,showing structures such as " listric style" and " flat and ramp style" in the section. The Upper Permian Longtan Formation has high quality gas-bearing coalbed and good exploration prospect of coalbed methane. The low resistance shale of the lower member of Middle Devonian Qiziqiao Formation is continuous and thick,and hence it can be regarded as a favorable exploration shale formation.
引文
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[15]王大伟,罗小平,吴昌荣,等.湘东南拗陷二叠系-泥盆系泥页岩分布及地球化学特征[J].成都理工大学学报:自然科学版,2014,41(1):78-86.Wang D W,Luo X P,Wu C R,et al. Geochemical characteristics of Devonian—Permian shale in Xiangdongnan depression,Hunan,China[J]. Journal of Chengdu University of Technology:Science&Technology Edition,2014,41(1):78-86.
[16]范厚江,黄飞.湘东南凹陷泥页岩有机地球化学特征研究[J].天然气技术与经济,2014,8(2):9-13.Fan H J,Huang F. Organic Geochemical Characteristics of the Shales in the Xiangdongnan Depression[J]. Natural Gas Technology and Economy,2014,8(2):9-13.
[17]李国亮,王先辉,杨俊,等.湘中及湘东南地区泥盆纪榴江组页岩气成藏条件及前景分析[J].国土资源导刊,2014,11(10):65-69.Li G L,Wang X H,Yang J,et al. Analysis on reservoir-forming conditions and prospects of the Devonian Liujiang Formation shale gas in the central and southeast Hunan province[J]. Land&Resources Herald,2014,11(10):65-69.
[18]湖南省地质矿产局.湖南省区域地质志[M].北京:地质出版社,1988.Bureau of Geology and Mineral of Hunan Province. Regional geology of Hunan province[M]. Beijing:Geological Press,1988.
[19]汪启年,李涛,朱将波.雪峰山西侧深部构造的特征——来自大地电磁测深(MT)的新证据[J].地质通报,2012,31(11):1826-1837.Wang Q N,Li T,Zhu J B. Deep structure characteristics on the western side of the Xuefeng Mountain:New evidence from megnetotelluric(MT)sounding[J]. Geological Bulletin of China,2012,31(11):1826-1837.
[20]柏道远,黄建中,刘耀荣,等.湘东南及湘粤赣边区中生代地质构造发展框架的厘定[J].中国地质,2005,32(4):557-570.Bo D Y,Huang J Z,Liu Y R,et al. Framework of Mesozoic tectonic evolution in southeastern Hunan and the Hunan-GuangdongJiangxi border area[J]. Geology in China,2005,32(4):557-570.
[2]杨长福,徐世浙.国外大地电磁研究现状[J].物探与化探,2005,29(3):243-247.Yang C F,Xu S Z. The present situation of magnetotelluric researches abroad[J]. Geophysical&Geochemical Exploration,2005,29(3):243-247.
[3]卓皆文,汪正江,王剑,等.雪峰山西侧地区海相油气勘探前景初析[J].沉积与特提斯地质,2009,29(1):1-9.Zhuo J W,Wang Z J,Wang J,et al. An approach to the oil and gas exploration potential in the marine strata in the western part of the Xuefeng Moutains,Southern China[J]. Sedimentary Geology and Tethyan Geology,2009,29(1):1-9.
[4]唐新功,胡文宝,苏朱刘.我国南方地区页岩气电磁勘探技术初探[J].长江大学学报:自然科学版,2011,8(11):33-34.Tang X G,Hu W B,Su Z L. Preliminary study of shale gas exploration in Southern China[J]. Journal of Yangtze University:Nat Sci Edit,2011,8(11):33-34.
[5]李玉喜,聂海宽,龙鹏宇.我国富含有机质泥页岩发育特点与页岩气战略选区[J].天然气工业,2009,29(12):115-118.Li Y X,Nie H K,Long P Y. Development characteristics of organic-rich shale and strategic selection of shale gas exploration area in China[J]. Natural Gas Industry,2009,29(12):115-118.
[6]李爱勇,柳建新,朱春生,等.大地电磁测深在桂中坳陷油气勘探中的应用[J].物探与化探,2012,36(1):8-12.Li A Y,Liu J X,Zhu C S,et al. The application of magnetotelluric sounding to oil and gas exploration in central Guanxi Depression[J]. Geophysical&Geochemical Exploration,2012,36(1):8-12.
[7]卫平生,谭开俊,张虎权,等.大地电磁测深在油气勘探中的应用——以民和盆地为例[J].天然气工业,2006,26(8):37-40.Wei P S,Tan K J,Zhang H Q,et al. Application of magnetotelluric sounding to oil and gas exploration:take the Minghe Basin as an example[J]. Natural Gas Industry,2006,26(8):37-40.
[8]柏道远,王先辉,马铁球,等.湘东南印支期褶皱特征及形成机制[J].华南地质与矿产,2006,2006(4):50-57.Bo D Y,Wang X H,Ma T Q,et al. Characteristics and forming mechanism of Indosinian folds in the southeast Hunan[J]. Geology and Mineral Resources of South China,2006,2006(4):50-57.
[9]石文斌,李启桂,李健.湘东南坳陷构造演化及油气成藏研究[J].国土资源导刊,2006(S1):19-25.Shi W B,Li Q G,Li J. Study on structural evolution and hydrocarbon accumulation in the Xiangdongnan depression[J]. Land&Resources Herald,2006(S1):19-25.
[10]徐昉昊,钱劲,袁海锋,等.湘中—湘东南拗陷泥页岩层系沉积模式及储层特征[J].成都理工大学学报:自然科学版,2015,42(1):80-89.Xu F H,Qian J,Yuan H F,et al. Sedimentary mode and reservoir properties of mud shale series of strata in Xiangzhong-Xiangdongnan depression,Hunan,China[J]. Journal of Chengdu University of Technology:Science&Technology Edition,2015,42(1):80-89.
[11]徐国盛,张震,罗小平,等.湘中和湘东南拗陷上古生界泥页岩含气性及其影响因素[J].成都理工大学学报:自然科学版,2013,40(5):577-587.Xu G S,Zhang Z,Luo G P,et al. Gas-bearing characteristics and affected factors of Upper Paleozoic shale in depressions of Central Hunan and Southeast Hunan,China[J]. Journal of Chengdu University of Technology:Science&Technology Edition,2013,40(5):577-587.
[12]李国亮,王先辉,柏道远,等.湘中及湘东南地区上二叠统龙潭组页岩气勘探前景[J].地质科技情报,2015,34(3):133-138.Li G L,Wang X H,Bo D Y,et al. Potentiality exploration of the Upper Permian Longtan Formation shale gas in central and southeast Hunan province[J]. Geological Science and Technology Information,2015,34(3):133-138.
[13]梁家驹,马若龙,步少峰,等.湘中、湘东南拗陷泥页岩层系储层特征[J].成都理工大学学报:自然科学版,2014,41(1):45-54.Liang J J,Ma R L,Bu S F,et al. Reservoir characteristics of shale in Xiangzhong depression and Xiangdongnan depression of Hunan,China[J]. Journal of Chengdu University of Technology(Science&Technology Edition),2014,41(1):45-54.
[14]张成龙,唐书恒,姜文,等.湘东南龙潭组页岩气储层特征与勘探前景浅析[J].特种油气藏,2014,21(1):26-30.Zhang C L,Tang S H,Jiang W,et al. Reservoir characteristics and Potentiality Exploration of the Longtan Formation shale gas in the southeast Hunan province[J]. Special Oil&Gas Reservoirs,2014,21(1):26-30.
[15]王大伟,罗小平,吴昌荣,等.湘东南拗陷二叠系-泥盆系泥页岩分布及地球化学特征[J].成都理工大学学报:自然科学版,2014,41(1):78-86.Wang D W,Luo X P,Wu C R,et al. Geochemical characteristics of Devonian—Permian shale in Xiangdongnan depression,Hunan,China[J]. Journal of Chengdu University of Technology:Science&Technology Edition,2014,41(1):78-86.
[16]范厚江,黄飞.湘东南凹陷泥页岩有机地球化学特征研究[J].天然气技术与经济,2014,8(2):9-13.Fan H J,Huang F. Organic Geochemical Characteristics of the Shales in the Xiangdongnan Depression[J]. Natural Gas Technology and Economy,2014,8(2):9-13.
[17]李国亮,王先辉,杨俊,等.湘中及湘东南地区泥盆纪榴江组页岩气成藏条件及前景分析[J].国土资源导刊,2014,11(10):65-69.Li G L,Wang X H,Yang J,et al. Analysis on reservoir-forming conditions and prospects of the Devonian Liujiang Formation shale gas in the central and southeast Hunan province[J]. Land&Resources Herald,2014,11(10):65-69.
[18]湖南省地质矿产局.湖南省区域地质志[M].北京:地质出版社,1988.Bureau of Geology and Mineral of Hunan Province. Regional geology of Hunan province[M]. Beijing:Geological Press,1988.
[19]汪启年,李涛,朱将波.雪峰山西侧深部构造的特征——来自大地电磁测深(MT)的新证据[J].地质通报,2012,31(11):1826-1837.Wang Q N,Li T,Zhu J B. Deep structure characteristics on the western side of the Xuefeng Mountain:New evidence from megnetotelluric(MT)sounding[J]. Geological Bulletin of China,2012,31(11):1826-1837.
[20]柏道远,黄建中,刘耀荣,等.湘东南及湘粤赣边区中生代地质构造发展框架的厘定[J].中国地质,2005,32(4):557-570.Bo D Y,Huang J Z,Liu Y R,et al. Framework of Mesozoic tectonic evolution in southeastern Hunan and the Hunan-GuangdongJiangxi border area[J]. Geology in China,2005,32(4):557-570.
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