龙门山前陆盆地南段须五段页岩气富集条件及有利区评价
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摘要
为探索龙门山前陆盆地南段须五段页岩气富集地质条件和资源远景区,运用页岩气基础地质评价方法,利用实测野外剖面、地球化学测试与扫描电镜等手段,明确了研究区龙门山前陆盆地南段须五段页岩气富集地质条件,并引入页岩气综合地质评价指数优选了勘探有利区。结果表明:研究区须五段黑色页岩总有机碳含量平均值大于2.0%,油浸镜质体反射率平均值大于1.25%,须五段底界平均埋深约为3 600 m,具有北西深、往南东方向变浅的特点,富有机质页岩累计有效厚度超过200 m,在桑园地区达到最厚,并且向周缘厚度递减,成分脆度均值大于0.50。综合地质评价指数计算结果表明,勘探有利区主要分布在眉山以西的蒲江—桑园区块,区域内地形平缓、面积大,是须五段页岩气最为有利的勘探开发前景区。该研究丰富了四川盆地陆相页岩气的勘探评价目标,可为未来陆相页岩气的勘探提供借鉴。
A fundamental shale gas geology evaluation is used to explore the enrichment geology condition and resource prospect of the Xu5 Member in the southern section of Longmenshan foreland basin. Field outcrop measurement,geochemical test,SEM and other tests are used to determine the shale gas enrichment geology conditions of the Xu5 Member in the southern section of the Longmenshan foreland basin. A shale gas comprehensive geological evaluation index is introduced to optimize the prospecting area. Result shows that the mean TOC of the black shale in this area exceeds 2.0% and the corresponding average vitrinite reflectance exceeds 1.25%. The average bottom burial depth of Xu5 Member is about 3 600 m,which is characterized by deep in the northwest and shallow in the southeast. The gross effective thickness of the organic-rich shale exceeds 200 m,which reaches the maximum thickness in Sangyuan and decreases toward the periphery. The average crispness of the ingredients is greater than 0. 50.According to the comprehensive geological evaluation index,the favorable prospecting areas mainly distribute in the Pujiang-Sangyuan area to the west of Meishan. It is characterized by gentle terrain and large area,which is considered as the most favorable prospects for shale gas exploration and development. This research expands the continental shale gas exploration and evaluation targets in the Sichuan Basin and could provide certain reference for the future continental shale gas exploration and development.
A fundamental shale gas geology evaluation is used to explore the enrichment geology condition and resource prospect of the Xu5 Member in the southern section of Longmenshan foreland basin. Field outcrop measurement,geochemical test,SEM and other tests are used to determine the shale gas enrichment geology conditions of the Xu5 Member in the southern section of the Longmenshan foreland basin. A shale gas comprehensive geological evaluation index is introduced to optimize the prospecting area. Result shows that the mean TOC of the black shale in this area exceeds 2.0% and the corresponding average vitrinite reflectance exceeds 1.25%. The average bottom burial depth of Xu5 Member is about 3 600 m,which is characterized by deep in the northwest and shallow in the southeast. The gross effective thickness of the organic-rich shale exceeds 200 m,which reaches the maximum thickness in Sangyuan and decreases toward the periphery. The average crispness of the ingredients is greater than 0. 50.According to the comprehensive geological evaluation index,the favorable prospecting areas mainly distribute in the Pujiang-Sangyuan area to the west of Meishan. It is characterized by gentle terrain and large area,which is considered as the most favorable prospects for shale gas exploration and development. This research expands the continental shale gas exploration and evaluation targets in the Sichuan Basin and could provide certain reference for the future continental shale gas exploration and development.
引文
[1]朱彤,俞凌杰,王烽.四川盆地海相、湖相页岩气形成条件对比及开发策略[J].天然气地球科学,2017,28(4):633-641.
[2]郑定业,庞雄奇,张可,等.四川盆地上三叠系须家河组油气资源评价[J].特种油气藏,2017,24(4):67-72.
[3]陈尘,韩嵩.川西南部须家河组勘探潜力再评价[J].天然气勘探与开发,2016,39(3):11-15.
[4]陈冬霞,谢明贤,张晓鹏,等.川西坳陷须五段陆相页岩气聚集条件分析[J].长江大学学报(自科版),2013,10(26):5-7.
[5]朱彤,包书景,王烽.四川盆地陆相页岩气形成条件及勘探开发前景[J].天然气工业,2012,32(9):23-28,133-134.
[6]陈刚,徐双辉,陈洪德,等.川西-川北地区T3x5页岩气成藏地质条件[J].成都理工大学学报(自然科学版),2014,41(1):8-17.
[7]陈磊,姜振学,邢金艳,等.川西坳陷新场28井上三叠统须五段页岩气储层特征研究及评价[J].石油天然气学报,2014,36(5):25-31.
[8]GUO Y,SONG Y,PANG X,et al.Hydrocarbon generation and expulsion of the Upper Triassic T3x5 Source Rocks in the Western Sichuan Depression:Assessment for Unconventional Natural Gas[J].Acta Geologica Sinica(English Edition),2015,89(1):175-186.
[9]李勇,曾允孚,伊海生.龙门山前陆盆地沉积及构造演化[M].成都:成都科技大学出版社,1995:20-24.
[10]罗啸泉.四川盆地西部流体封存箱与天然气成藏的关系[J].特种油气藏,2005,12(6):18-21.
[11]邓康龄.四川盆地形成演化与油气勘探领域[J].天然气工业,1992,12(5):7-12.
[12]宋光春,李玉星,王武昌.温度和压力对CO2置换甲烷水合物的影响[J].油气储运,2016,35(3):295-301.
[13]陈杨,赵霞飞,刘树根,等.四川盆地西部海相碎屑岩-陆相碎屑岩的转换过程[J].成都理工大学学报(自然科学版),2009,36(6):697-705.
[14]苏卫锋,王贵涛,张磊.西三线长江盾构断层带分析与风险应对措施[J].油气储运,2016,35(3):336-338,342.
[15]王社教,杨涛,张国生,等.页岩气主要富集因素与核心区选择及评价[J].中国工程科学,2012,14(6):94-100.
[16]邹才能,董大忠,王社教,等.中国页岩气形成机理、地质特征及资源潜力[J].石油勘探与开发,2010,37(6):641-653.
[17]JARVIE D M,HILL R J,RUBLE T E,et al.Unconventional shale-gas systems:The Mississippian Barnett Shale of north-central Texas as one model for thermogenic shale-gas assessment[J].AAPG Bulletin,2007,91(4):475-499.
[18]王伟明,李勇,汪正江,等.致密砂岩储层岩石脆性评价及相关因素分析[J].中国石油勘探,2016,21(6):50-57.
[19]李延钧,刘欢,张烈辉,等.四川盆地南部下古生界龙马溪组页岩气评价指标下限[J].中国科学:D辑地球科学,2013,43(7):1088-1095.
[2]郑定业,庞雄奇,张可,等.四川盆地上三叠系须家河组油气资源评价[J].特种油气藏,2017,24(4):67-72.
[3]陈尘,韩嵩.川西南部须家河组勘探潜力再评价[J].天然气勘探与开发,2016,39(3):11-15.
[4]陈冬霞,谢明贤,张晓鹏,等.川西坳陷须五段陆相页岩气聚集条件分析[J].长江大学学报(自科版),2013,10(26):5-7.
[5]朱彤,包书景,王烽.四川盆地陆相页岩气形成条件及勘探开发前景[J].天然气工业,2012,32(9):23-28,133-134.
[6]陈刚,徐双辉,陈洪德,等.川西-川北地区T3x5页岩气成藏地质条件[J].成都理工大学学报(自然科学版),2014,41(1):8-17.
[7]陈磊,姜振学,邢金艳,等.川西坳陷新场28井上三叠统须五段页岩气储层特征研究及评价[J].石油天然气学报,2014,36(5):25-31.
[8]GUO Y,SONG Y,PANG X,et al.Hydrocarbon generation and expulsion of the Upper Triassic T3x5 Source Rocks in the Western Sichuan Depression:Assessment for Unconventional Natural Gas[J].Acta Geologica Sinica(English Edition),2015,89(1):175-186.
[9]李勇,曾允孚,伊海生.龙门山前陆盆地沉积及构造演化[M].成都:成都科技大学出版社,1995:20-24.
[10]罗啸泉.四川盆地西部流体封存箱与天然气成藏的关系[J].特种油气藏,2005,12(6):18-21.
[11]邓康龄.四川盆地形成演化与油气勘探领域[J].天然气工业,1992,12(5):7-12.
[12]宋光春,李玉星,王武昌.温度和压力对CO2置换甲烷水合物的影响[J].油气储运,2016,35(3):295-301.
[13]陈杨,赵霞飞,刘树根,等.四川盆地西部海相碎屑岩-陆相碎屑岩的转换过程[J].成都理工大学学报(自然科学版),2009,36(6):697-705.
[14]苏卫锋,王贵涛,张磊.西三线长江盾构断层带分析与风险应对措施[J].油气储运,2016,35(3):336-338,342.
[15]王社教,杨涛,张国生,等.页岩气主要富集因素与核心区选择及评价[J].中国工程科学,2012,14(6):94-100.
[16]邹才能,董大忠,王社教,等.中国页岩气形成机理、地质特征及资源潜力[J].石油勘探与开发,2010,37(6):641-653.
[17]JARVIE D M,HILL R J,RUBLE T E,et al.Unconventional shale-gas systems:The Mississippian Barnett Shale of north-central Texas as one model for thermogenic shale-gas assessment[J].AAPG Bulletin,2007,91(4):475-499.
[18]王伟明,李勇,汪正江,等.致密砂岩储层岩石脆性评价及相关因素分析[J].中国石油勘探,2016,21(6):50-57.
[19]李延钧,刘欢,张烈辉,等.四川盆地南部下古生界龙马溪组页岩气评价指标下限[J].中国科学:D辑地球科学,2013,43(7):1088-1095.