四川盆地长宁地区震旦系—寒武系裂陷槽的发现及其地质意义
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摘要
四川盆地安岳气田位于德阳—安岳裂陷槽东台缘,已探明近1×10~(12)m~3天然气储量。前期天然气勘探开发揭示,震旦系—寒武系的德阳—安岳裂陷槽是油气富集的有利区,但对其往南延伸情况及分布一直认识不清。通过对三维地震资料和钻井资料的综合分析,发现长宁地区发育震旦系—寒武系裂陷槽,并精细刻画了该区裂陷槽的边界与空间展布。研究揭示:①长宁地区台缘带筇竹寺组具有超覆现象,而灯影组地震削截特征明显;②地震解释震旦系灯影组厚度从台缘带至槽内显著减薄,从台内至台缘带有增厚趋势;③该裂陷槽为德阳—安岳裂陷槽南延的东侧部分。结论认为,四川盆地南部长宁地区裂陷槽周缘筇竹寺组烃源岩优越、台缘带灯影组丘滩相储层发育,灯影组天然气成藏配置条件好,区内台缘带为下步重要的勘探有利区带。
For Anyue gasfield located at eastern platform margin of Deyang-Anyue rift trough, Sichuan Basin, its proved reserves are about 1×10~(12) m~3. And its early exploration and development reveals that this Sinian-Cambrian rift trough is a favorable zone for hydrocarbon accumulation. However, its southward extension had not been made clearly. So, after taking full advantage of 3D seismic and drilling data, it was discovered that the Sinian-Cambrian rift trough is also developed in Changning area. Both boundary and spatial distribution of this rift trough in Changning area were characterized precisely. Results show that,(1) in platform margin of Changning area, Qiongzhusi Formation has features of overlap whereas Dengying Formation has obvious earthquake truncation;(2) seismic interpretation on Sinian Dengying Formation demonstrates a decrease in thickness from platform margin to intra-trough whereas an increase from intra-platform to platform margin; and(3) this rift trough is an eastern part of southward extension of Deyang-Anyue rift trough. In conclusion, in Changning area, southern Sichuan Basin, source rock of Qiongzhusi Formation in the periphery of the rift trough is superior, and bioherm beach facies reservoirs of Dengying Formation in platform margin are well developed, and reservoir-forming association for Dengying Formation is good, so the platform margin in this area is one favorable zone for next exploration.
For Anyue gasfield located at eastern platform margin of Deyang-Anyue rift trough, Sichuan Basin, its proved reserves are about 1×10~(12) m~3. And its early exploration and development reveals that this Sinian-Cambrian rift trough is a favorable zone for hydrocarbon accumulation. However, its southward extension had not been made clearly. So, after taking full advantage of 3D seismic and drilling data, it was discovered that the Sinian-Cambrian rift trough is also developed in Changning area. Both boundary and spatial distribution of this rift trough in Changning area were characterized precisely. Results show that,(1) in platform margin of Changning area, Qiongzhusi Formation has features of overlap whereas Dengying Formation has obvious earthquake truncation;(2) seismic interpretation on Sinian Dengying Formation demonstrates a decrease in thickness from platform margin to intra-trough whereas an increase from intra-platform to platform margin; and(3) this rift trough is an eastern part of southward extension of Deyang-Anyue rift trough. In conclusion, in Changning area, southern Sichuan Basin, source rock of Qiongzhusi Formation in the periphery of the rift trough is superior, and bioherm beach facies reservoirs of Dengying Formation in platform margin are well developed, and reservoir-forming association for Dengying Formation is good, so the platform margin in this area is one favorable zone for next exploration.
引文
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[12]赵文智,魏国齐,杨威,等.四川盆地万源-达州克拉通内裂陷的发现及勘探意义[J].石油勘探与开发,2017,44(5):659-669.Zhao Wenzhi,Wei Guoqi,Yang Wei,et al.Discovery of Wanyuan-Dazhou intracratonic rift and its exploration significance in the Sichuan Basin,SW China[J].Petroleum Exploration and Development,2017,44(5):659-669.
[13]邹才能,杜金虎,徐春春,等.四川盆地震旦系-寒武系特大型气田形成分布、资源潜力及勘探发现[J].石油勘探与开发,2014,41(3):278-293.Zou Caineng,Du Jinhu,Xu Chunchun,et al.Formation,distribution,resource potential and discovery of the Sinian-Cambrian giant gas field,Sichuan Basin,SW China[J].Petroleum Exploration and Development,2014,41(3):278-293.
[14]李海洋.蜀南地区西南部震旦系灯影组成藏条件研究[D].北京:中国石油大学,2016.Li Haiyang.Study of hydrocarbon accumulation conditions about Dengying Formation of Sinian in southwest of Shunan area[D].Beijing:China University of Petroleum,2016.
[15]黄文明.四川盆地震旦系储层特征及其形成机制研究[D].成都:成都理工大学,2008.Huang Wenming.Study on the characteristics and formation mechanism of Sinian Reservoirs in Sichuan Basin[D].Chengdu:Chengdu University of Technology,2008.
[16]彭瀚霖.川西南-川中地区上震旦统灯影组储层特征研究[D].成都:成都理工大学,2014.Peng Hanlin.The characteristics of the Upper Sinian Dengying Formation reservoir rocks in the Southwestern to Central Sichuan Basin[D].Chengdu:Chengdu University of Technology,2014.
[17]斯春松,郝毅,周进高,等.四川盆地灯影组储层特征及主控因素[J].成都理工大学学报(自然科学版),2014,41(3):266-273.Si Chunsong,Hao Yi,Zhou Jingao,et al.Characteristics and controlling factors of reservoir in Sinian Dengying Formation,Sichuan Basin,China[J].Journal of Chengdu University of Technology(Science&Technology Edition),2014,41(3):266-273.
[18]黄籍中,陈盛吉,宋家荣,等.四川盆地烃源体系与大中型气田形成[J].中国科学(D辑),1996,26(6):504-510.Huang Jizhong,Chen Shengji,Song Jiarong,et al.Hydrocarbon source systems and formation of gas fields in Sichuan Basin[J].Science in China Series D:Earth Sciences,1997,40(1):32-42.
[19]徐胜林,陈洪德,陈安清,等.四川盆地海相地层烃源岩特征[J].吉林大学学报(地球科学版),2011,41(2):343-350.Xu Shenglin,Chen Hongde,Chen Anqing,et al.Source rock characteristics of marine strata,Sichuan Basin[J].Journal of Jilin University(Earth Science Edition),2011,41(2):343-350.
[20]吴陈君,张明峰,刘艳,等.四川盆地古生界泥页岩的地球化学特征[J].煤炭学报,2013,38(5):794-799.Wu Chenjun,Zhang Mingfeng,Liu Yan,et al.Geochemical characteristics of Paleozoic shale in Sichuan Basin and their gas content features[J].Journal of China Coal Society,2013,38(5):794-799.
[2]魏国齐,杨威,杜金虎,等.四川盆地震旦纪-早寒武世克拉通内裂陷地质特征[J].天然气工业,2015,35(1):24-35.Wei Guoqi,Yang Wei,Du Jinhu,et al.Geological characteristics of the Sinian-Early Cambrian intracratonic rift,Sichuan Basin[J].Natural Gas Industry,2015,35(1):24-35.
[3]李忠权,刘记,李应,等.四川盆地震旦系威远-安岳拉张侵蚀槽特征及形成演化[J].石油勘探与开发,2015,42(1):26-33.Li Zhongquan,Liu Ji,Li Ying,et al.Formation and evolution of Weiyuan-Anyue extension-erosion groove in Sinian system,Sichuan Basin[J].Petroleum Exploration and Development,2015,42(1):26-33.
[4]刘辉,韩嵩,叶茂,等.四川盆地大中型气田分布特征及勘探前景[J].天然气勘探与开发,2018,41(2):55-62.Liu Hui,Han Song,Ye Mao,et al.Medium to large gas fields in Sichuan Basin:distribution characteristics and exploration prospects[J].Natural Gas Exploration and Development,2018,41(2):55-62.
[5]四川油气区石油地质志编写组.中国石油地质志-卷十:四川油气区[M].北京:石油工业出版社,1989.Sichuan Expected Oil Geology of Editorial Committee.Petroleum geology of China,Vol.10:Sichuan oil and gas provinces[M].Beijing:Petroleum Industry Press,1989.
[6]陆松年,李怀坤,陈志宏,等.新元古时期中国古大陆与罗迪尼亚超大陆的关系[J].地学前缘,2004,11(2):515-523.Lu Songnian,Li Huaikun,Chen Zhihong,et al.Relationship between Neoproterozoic cratons of China and the Rodinia[J].Earth Science Frontiers,2004,11(2):515-523.
[7]黄汲清.对四川盆地和鄂尔多斯台坳找油找气的初步意见[J].石油与天然气地质,1980,1(1):18-25.Huang Jiqing.Some ideas on the oil and gas potential of Sichuan Basin and Ordos platform downwarp[J].Oil&Gas Geology,1980,1(1):18-25.
[8]罗志立.略论地裂运动与中国油气分布[J].中国地质科学院院报,1984,6(3):93-101.Luo Zhili.A discussion of taphrogenesis and hydrocarbon distribution in China[J].Bulletin of the Chinese Academy of Geological Sciences,1984,6(3):93-101.
[9]周进高,张建勇,邓红婴,等.四川盆地震旦系灯影组岩相古地理与沉积模式[J].天然气工业,2017,37(1):24-31.Zhou Jingao,Zhang Jianyong,Deng Hongying,et al.Lithofacies paleogeography and sedimentary model of Sinian Dengying Fm in the Sichuan Basin[J].Natural Gas Industry,2017,37(1):24-31.
[10]汪泽成,姜华,王铜山,等.四川盆地桐湾期古地貌特征及成藏意义[J].石油勘探与开发,2014,41(3):305-312.Wang Zecheng,Jiang Hua,Wang Tongshan,et al.Paleo-geomorphology formed during Tongwan Tectonization in Sichuan Basin and its significance for hydrocarbon accumulation[J].Petroleum Exploration and Development,2014,41(3):305-312.
[11]李宗银,姜华,汪泽成,等.构造运动对四川盆地震旦系油气成藏的控制作用[J].天然气工业,2014,34(3):23-30.Li Zongyin,Jiang Hua,Wang Zecheng,et al.Control of tectonic movement on hydrocarbon accumulation in the Sinian strata,Sichuan Basin[J].Natural Gas Industry,2014,34(3):23-30.
[12]赵文智,魏国齐,杨威,等.四川盆地万源-达州克拉通内裂陷的发现及勘探意义[J].石油勘探与开发,2017,44(5):659-669.Zhao Wenzhi,Wei Guoqi,Yang Wei,et al.Discovery of Wanyuan-Dazhou intracratonic rift and its exploration significance in the Sichuan Basin,SW China[J].Petroleum Exploration and Development,2017,44(5):659-669.
[13]邹才能,杜金虎,徐春春,等.四川盆地震旦系-寒武系特大型气田形成分布、资源潜力及勘探发现[J].石油勘探与开发,2014,41(3):278-293.Zou Caineng,Du Jinhu,Xu Chunchun,et al.Formation,distribution,resource potential and discovery of the Sinian-Cambrian giant gas field,Sichuan Basin,SW China[J].Petroleum Exploration and Development,2014,41(3):278-293.
[14]李海洋.蜀南地区西南部震旦系灯影组成藏条件研究[D].北京:中国石油大学,2016.Li Haiyang.Study of hydrocarbon accumulation conditions about Dengying Formation of Sinian in southwest of Shunan area[D].Beijing:China University of Petroleum,2016.
[15]黄文明.四川盆地震旦系储层特征及其形成机制研究[D].成都:成都理工大学,2008.Huang Wenming.Study on the characteristics and formation mechanism of Sinian Reservoirs in Sichuan Basin[D].Chengdu:Chengdu University of Technology,2008.
[16]彭瀚霖.川西南-川中地区上震旦统灯影组储层特征研究[D].成都:成都理工大学,2014.Peng Hanlin.The characteristics of the Upper Sinian Dengying Formation reservoir rocks in the Southwestern to Central Sichuan Basin[D].Chengdu:Chengdu University of Technology,2014.
[17]斯春松,郝毅,周进高,等.四川盆地灯影组储层特征及主控因素[J].成都理工大学学报(自然科学版),2014,41(3):266-273.Si Chunsong,Hao Yi,Zhou Jingao,et al.Characteristics and controlling factors of reservoir in Sinian Dengying Formation,Sichuan Basin,China[J].Journal of Chengdu University of Technology(Science&Technology Edition),2014,41(3):266-273.
[18]黄籍中,陈盛吉,宋家荣,等.四川盆地烃源体系与大中型气田形成[J].中国科学(D辑),1996,26(6):504-510.Huang Jizhong,Chen Shengji,Song Jiarong,et al.Hydrocarbon source systems and formation of gas fields in Sichuan Basin[J].Science in China Series D:Earth Sciences,1997,40(1):32-42.
[19]徐胜林,陈洪德,陈安清,等.四川盆地海相地层烃源岩特征[J].吉林大学学报(地球科学版),2011,41(2):343-350.Xu Shenglin,Chen Hongde,Chen Anqing,et al.Source rock characteristics of marine strata,Sichuan Basin[J].Journal of Jilin University(Earth Science Edition),2011,41(2):343-350.
[20]吴陈君,张明峰,刘艳,等.四川盆地古生界泥页岩的地球化学特征[J].煤炭学报,2013,38(5):794-799.Wu Chenjun,Zhang Mingfeng,Liu Yan,et al.Geochemical characteristics of Paleozoic shale in Sichuan Basin and their gas content features[J].Journal of China Coal Society,2013,38(5):794-799.
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