灰屑砂岩在须家河组沉积相研究中的应用
|
摘要
利用岩心薄片、岩屑薄片、测井和地震资料对四川盆地须家河组砂岩类型开展研究,明确了川西至川中地区须一、须三、须五段内大面积发育灰屑砂岩,属于三角洲前缘水下分流河道沉积,具有成熟度低、灰质胶结重、粒间孔少、物性差等特征,局部发育相对高孔"甜点"砂体。电性上表现为"三低两高"特征,即低自然伽玛、低声波时差、低补偿中子、高电阻、高密度;地震上表现为高阻抗特征。以灰屑砂岩作为典型标志层,提出在剑阁—蓬莱地区发育大型三角洲体。该三角洲体具有继承性发育特征,在须一、须三、须五段沉积时期,与优质泥质烃源岩共生,生储盖组合好,具备形成大规模致密气的成藏条件。图6参4
Xujiahe sandstone reservoir,Sichuan Basin,was studied by means of thin-section identification,and well-logging and seismic data.Results show that calcarenaceous sandstone is widely developed in the Xujiahe 1,Xujiahe 3,and Xujiahe 5 members,western and central Sichuan Basin.For the sandstone,the content of limeclast is more than 30 percent;and it is developed in the whole Xujiahe Formation of Jiange-Penglai area.Xujiahe Formation not only belongs to the deposition of deltaic front underwater distributary channel facies,but also is characterized by low maturity,high calcite cementation,a few intergranular pores,and poor physical property.It is also found that some sweet spots with relatively high porosity are developed.In view of electric property,it appears a character of three lows and two highs,namely,low GR,low interval transit time,low CNL,and high resistivity,high density.Seismically,it assumes a feature of high impedance.In addition,an idea that a large-scale deltaic body is developed in Jiange-Penglai area is presented.This body is featured by inherited development.In particular,during the deposition of Xujiahe 1,Xujiahe 3,and Xujiahe 5 members,not only the intergrowth between the body and high-quality argillaceous source rock but also good source-reservoir-caprock assemblage were conducive to forming large-scale tight gas reservoirs.
Xujiahe sandstone reservoir,Sichuan Basin,was studied by means of thin-section identification,and well-logging and seismic data.Results show that calcarenaceous sandstone is widely developed in the Xujiahe 1,Xujiahe 3,and Xujiahe 5 members,western and central Sichuan Basin.For the sandstone,the content of limeclast is more than 30 percent;and it is developed in the whole Xujiahe Formation of Jiange-Penglai area.Xujiahe Formation not only belongs to the deposition of deltaic front underwater distributary channel facies,but also is characterized by low maturity,high calcite cementation,a few intergranular pores,and poor physical property.It is also found that some sweet spots with relatively high porosity are developed.In view of electric property,it appears a character of three lows and two highs,namely,low GR,low interval transit time,low CNL,and high resistivity,high density.Seismically,it assumes a feature of high impedance.In addition,an idea that a large-scale deltaic body is developed in Jiange-Penglai area is presented.This body is featured by inherited development.In particular,during the deposition of Xujiahe 1,Xujiahe 3,and Xujiahe 5 members,not only the intergrowth between the body and high-quality argillaceous source rock but also good source-reservoir-caprock assemblage were conducive to forming large-scale tight gas reservoirs.
引文
1 罗文军,彭军,曾小英,等,川西丰谷地区须四段钙屑砂岩优质储层形成机理[J].石油实验地质,2012,34(4):412-421.
2 郑荣才,魏钦廉,高红灿,等.川西坳陷中段须四段钙屑砂岩储层特征及有利区块预测[J].成都理工大学学报(自然科学版),2007,34(5):489-495.
3 曾小英,张小青,钟玉梅.川西坳陷中段须四段钙屑砂岩气层的成因[J].沉积学报,2007,25(6):896-901.
4 胡文瑞.我国非常规天然气资源、现状、问题及解决方案[J].石油科技论坛,2012,1-4.
5 赵靖舟,李军,曹青,等.论致密大油气田成藏模式[J].石油与天然气地质,2013,34(5):573-583.
6 邱中建,赵文智,胡素云,等,我国天然气资源潜力及其在未来低碳经济发展中的重要地位[J].中国工程科学,2011,13(6):81-87.
7 戴金星,倪云燕,吴小奇.中国致密砂岩气及在勘探开发上的重要意义[J].石油勘探与开发,2012,39(3):257-264.
8 姜振学,林世国,庞雄奇,等.两种类型致密砂岩气藏对比[J].石油实验地质,2006,28(3):210-214.
2 郑荣才,魏钦廉,高红灿,等.川西坳陷中段须四段钙屑砂岩储层特征及有利区块预测[J].成都理工大学学报(自然科学版),2007,34(5):489-495.
3 曾小英,张小青,钟玉梅.川西坳陷中段须四段钙屑砂岩气层的成因[J].沉积学报,2007,25(6):896-901.
4 胡文瑞.我国非常规天然气资源、现状、问题及解决方案[J].石油科技论坛,2012,1-4.
5 赵靖舟,李军,曹青,等.论致密大油气田成藏模式[J].石油与天然气地质,2013,34(5):573-583.
6 邱中建,赵文智,胡素云,等,我国天然气资源潜力及其在未来低碳经济发展中的重要地位[J].中国工程科学,2011,13(6):81-87.
7 戴金星,倪云燕,吴小奇.中国致密砂岩气及在勘探开发上的重要意义[J].石油勘探与开发,2012,39(3):257-264.
8 姜振学,林世国,庞雄奇,等.两种类型致密砂岩气藏对比[J].石油实验地质,2006,28(3):210-214.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心