普光气田与元坝气田礁滩储层特征的差异性及其成因
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摘要
中国石化勘探南方分公司在川东北地区先后发现了普光气田和元坝气田。为弄清两个气田的成藏规律,指导该区下一步的油气勘探部署,以碳酸盐岩沉积学、层序地层学、地震地层学等理论为指导,充分利用普光气田与元坝气田的地质录井、测井和高精度三维地震资料,对两个气田二叠系长兴组、三叠系飞仙关组礁滩储层岩石学特征、储集空间类型、物性特征、分布特征等进行了对比分析。结果表明:普光气田与元坝气田台缘相带储层发育既有相似性,又有明显的差异性;储层发育情况受台地边缘相带控制,普光地区储层以飞仙关组台缘滩白云岩为主,元坝地区储层则以长兴组台缘礁滩白云岩为主。分析其原因后认为,早期古地貌和构造作用以及白云岩化作用的差异可能是造成两个气田储层发育差异的主要控制因素。该研究成果对认识川东北及相似地区的地质规律,指导油气勘探具有现实意义。
Puguang and Yuanba gas fields were discovered successively in the northeastern Sichuan Basin by the Sinopec South Exploration Company.In order to understand the patterns of gas accumulation in these two gas fields and guide future exploration in this study area,we carried out a comparative analysis of the petrological characteristics,reservoir space types,physical properties,and distribution patterns of reef-bank reservoirs in the Permian Changxing Fm-Triassic Feixianguan Fm between the two gas fields through fully utilizing the logging data and high resolution 3D data and under the theoretical guidance of carbonate sedimentology,sequence stratigraphy and seismic stratigraphy.The following conclusions were obtained.(1) The reservoirs in the platform-margin facies belt of the two gas fields show both similarities and differences.(2) As the development and evolution of reservoirs is controlled by platform-margin facies belt,the reservoirs in the Puguang area are dominated by dolostone of platform-margin bank facies in the Feixianguan Fm,while those in the Yuanba area by dolostone of reef-bank facies in the Changxing Fm.It shows that the differences in the early palaeotopography and tectonism as well as dolomitzation may be the main factors resulting in the differences of reservoir development between the two gas fields.These understandings are of great significances to the study of the geological conditions and to the guidance of oil/gas exploration in the northeastern Sichuan Basin and its adjacent areas.
Puguang and Yuanba gas fields were discovered successively in the northeastern Sichuan Basin by the Sinopec South Exploration Company.In order to understand the patterns of gas accumulation in these two gas fields and guide future exploration in this study area,we carried out a comparative analysis of the petrological characteristics,reservoir space types,physical properties,and distribution patterns of reef-bank reservoirs in the Permian Changxing Fm-Triassic Feixianguan Fm between the two gas fields through fully utilizing the logging data and high resolution 3D data and under the theoretical guidance of carbonate sedimentology,sequence stratigraphy and seismic stratigraphy.The following conclusions were obtained.(1) The reservoirs in the platform-margin facies belt of the two gas fields show both similarities and differences.(2) As the development and evolution of reservoirs is controlled by platform-margin facies belt,the reservoirs in the Puguang area are dominated by dolostone of platform-margin bank facies in the Feixianguan Fm,while those in the Yuanba area by dolostone of reef-bank facies in the Changxing Fm.It shows that the differences in the early palaeotopography and tectonism as well as dolomitzation may be the main factors resulting in the differences of reservoir development between the two gas fields.These understandings are of great significances to the study of the geological conditions and to the guidance of oil/gas exploration in the northeastern Sichuan Basin and its adjacent areas.
引文
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[3]胡东风.川东北元坝地区隐蔽气藏的勘探突破及其意义[J].天然气工业,2010,30(8):9-12.
[4]段金宝,黄仁春,程胜辉,等.川东北元坝地区长兴期—飞仙关期碳酸盐岩台地沉积体系及演化[J].成都理工大学学报:自然科学版,2008,35(6):663-668.
[5]倪新锋,陈洪德,田景春,等.川东北地区长兴组—飞仙关组沉积格局及成藏控制意义[J].石油与天然气地质,2007,28(4):458-465.
[6]陈洪德,覃建雄,王成善,等.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(4):511-521.
[7]何鲤,罗潇,刘莉萍,等.试论四川盆地晚二叠世沉积环境与礁滩分布[J].天然气工业,2008,28(1):28-32.
[8]曾萍,谭钦银,余谦,等.四川盆地东北部飞仙关组暴露浅滩、非暴露浅滩与储层关系[J].沉积与特提斯地质,2003,23(4):41-45.
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