川南地区石宝矿段龙潭组层序地层研究
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摘要
针对川南地区上二叠统龙潭组煤系地层埋深和厚度变化大的特点,以沉积岩石学、层序地层学的理论方法为指导,综合前人研究成果,通过对石宝矿段内上二叠统龙潭组野外露头、钻井岩芯和物探测井资料的研究,识别出区域不整合面、河流冲刷侵蚀面、岩性、岩相转换面和最大海泛面4种层序界面及其物质表现形式,并将其划分为3个长期基准面旋回层序(LSC1-LSC3)和若干中期基准面旋回层序。运用等时对比法,进行连井层序地层对比,建立了等时地层格架。根据基准面旋回升降趋势对各长期旋回层序内物质变化规律和成煤机制进行了系统的描述。认为对石宝矿段的煤层气勘探开发工作具有重要意义。
Upper Permian Longtan Formation coal-bearing strata in southern Sichuan region is characterized by the depth and thickness variation.Guided by the theories and methods of the Sedimentary petrology and sequence stratigraphy,through consolidated results of previous studies,the authors divided the Upper Permian Longtan Formation in the Shibao ore block of South Sichuan into 3long-term sequence(LSC1-LSC3)and many medium-term sequences through comprehensive study of outcrops,coring,logging and seismic data.According to the identified four kinds of sequence boundary and its manifestations substances,including regional unconformity,fluvial erosion surface,lithology,lithofacies conversion surface and maximum flooding surface,the long-term base-level cycles in each cycle of the material change and mechanism of coal accumulation has been described.By multi-well sequence stratigraphy contrast,isochronous stratigraphic framework has been established that has important implications for coalbed methane exploration and mine development work Shibao ore block.
Upper Permian Longtan Formation coal-bearing strata in southern Sichuan region is characterized by the depth and thickness variation.Guided by the theories and methods of the Sedimentary petrology and sequence stratigraphy,through consolidated results of previous studies,the authors divided the Upper Permian Longtan Formation in the Shibao ore block of South Sichuan into 3long-term sequence(LSC1-LSC3)and many medium-term sequences through comprehensive study of outcrops,coring,logging and seismic data.According to the identified four kinds of sequence boundary and its manifestations substances,including regional unconformity,fluvial erosion surface,lithology,lithofacies conversion surface and maximum flooding surface,the long-term base-level cycles in each cycle of the material change and mechanism of coal accumulation has been described.By multi-well sequence stratigraphy contrast,isochronous stratigraphic framework has been established that has important implications for coalbed methane exploration and mine development work Shibao ore block.
引文
[1]四川省地质矿产勘查开发局一一三地质队.四川省古蔺县川南煤田古叙矿区石宝矿段煤炭资源详查报告[R].2010.
[2]四川省地质矿产勘查开发局一一三地质队.四川省古蔺县石宝矿段石宝-邱家祠井田煤层气地质调查评价报告[R].2012.
[3]邵龙义,陈家良,李瑞军,等.广西合山晚二叠世碳酸盐岩型煤系层序地层分析[J].沉积学报,2003,21(1):168-174.
[4]邵龙义,高彩霞,张超,等.西南地区晚二叠世层序-古地理及聚煤特征[J].沉积学报,2003,31(5):856-866.
[5]冯志明.川南煤田古叙矿区龙潭组地层层序及聚煤特征[J].四川地质学报,2010,30(3):1-6.
[6]赵宗举,周慧,陈轩等.四川盆地及邻区二叠纪层序岩相古地理及有利勘探区带[J].石油学报,2012,33(12):35-51.
[7]梁万金,魏文金,邓野平.川南煤田古叙矿区含煤地层格架及聚煤作用[J].四川地质学报,2013,33(9):287-302.
[8]马新华,魏国齐,钱凯,等.我国中西部前陆盆地天然气勘探的几点认识[J].石油与天然气地质,2000,21(2):114-117.
[9]郑荣才,吴朝容,叶茂才.浅谈陆相盆地高分辨率层序地层研究思路[J].成都理工学院学报,2000,27(3):241-244.
[10]郑荣才,尹世民,彭军.基准面旋回结构与叠加样式的沉积动力学分析[J].沉积学报,2000,18[3]:369-375.
[11]徐胜林,陈洪德,林良彪,等.川东南地区飞仙关组层序岩相古地理特征[J].中国地质,2009,26(5):1055-1064.
[12]李绍虎,吴冲龙,王华,等.四川须家河组层序地层格架与天然气成藏的关系[J].石油与天然气地质,1998,19(2):146-151.
[13]陈洪德,覃建雄,王成善.中国南方二叠纪层序岩相古地理特征及演化[J].沉积学报,1999,17(14):510-520.
[14]王成善,陈洪德,寿建峰,等.中国南方二叠纪层序地层划分与对比[J].沉积学报,1999,17(4):499-509.
[15]徐怀大.陆相层序地层学研究中的某些问题[J].石油与天然气地质,1997,18(2):83-89.
[16]邓宏文.美国层序地层研究中的新学派—高分辨率层序地层学[J].石油与天然气地质,1995,16(2):89-97.
[17]李祥辉,王成善,陈洪德,等.中国南方二叠纪层序地层时空格架及充填特征[J].沉积学报,1999,17(4):522-528.
[18]吕大炜,李增学,魏久传,等.基于不同成煤理论的含煤地层层序划分[J].中国石油大学学报:自然科学版,2010,34(4):49-66.
[2]四川省地质矿产勘查开发局一一三地质队.四川省古蔺县石宝矿段石宝-邱家祠井田煤层气地质调查评价报告[R].2012.
[3]邵龙义,陈家良,李瑞军,等.广西合山晚二叠世碳酸盐岩型煤系层序地层分析[J].沉积学报,2003,21(1):168-174.
[4]邵龙义,高彩霞,张超,等.西南地区晚二叠世层序-古地理及聚煤特征[J].沉积学报,2003,31(5):856-866.
[5]冯志明.川南煤田古叙矿区龙潭组地层层序及聚煤特征[J].四川地质学报,2010,30(3):1-6.
[6]赵宗举,周慧,陈轩等.四川盆地及邻区二叠纪层序岩相古地理及有利勘探区带[J].石油学报,2012,33(12):35-51.
[7]梁万金,魏文金,邓野平.川南煤田古叙矿区含煤地层格架及聚煤作用[J].四川地质学报,2013,33(9):287-302.
[8]马新华,魏国齐,钱凯,等.我国中西部前陆盆地天然气勘探的几点认识[J].石油与天然气地质,2000,21(2):114-117.
[9]郑荣才,吴朝容,叶茂才.浅谈陆相盆地高分辨率层序地层研究思路[J].成都理工学院学报,2000,27(3):241-244.
[10]郑荣才,尹世民,彭军.基准面旋回结构与叠加样式的沉积动力学分析[J].沉积学报,2000,18[3]:369-375.
[11]徐胜林,陈洪德,林良彪,等.川东南地区飞仙关组层序岩相古地理特征[J].中国地质,2009,26(5):1055-1064.
[12]李绍虎,吴冲龙,王华,等.四川须家河组层序地层格架与天然气成藏的关系[J].石油与天然气地质,1998,19(2):146-151.
[13]陈洪德,覃建雄,王成善.中国南方二叠纪层序岩相古地理特征及演化[J].沉积学报,1999,17(14):510-520.
[14]王成善,陈洪德,寿建峰,等.中国南方二叠纪层序地层划分与对比[J].沉积学报,1999,17(4):499-509.
[15]徐怀大.陆相层序地层学研究中的某些问题[J].石油与天然气地质,1997,18(2):83-89.
[16]邓宏文.美国层序地层研究中的新学派—高分辨率层序地层学[J].石油与天然气地质,1995,16(2):89-97.
[17]李祥辉,王成善,陈洪德,等.中国南方二叠纪层序地层时空格架及充填特征[J].沉积学报,1999,17(4):522-528.
[18]吕大炜,李增学,魏久传,等.基于不同成煤理论的含煤地层层序划分[J].中国石油大学学报:自然科学版,2010,34(4):49-66.