Control on cap rock seal capacity by sequence style in middle-upper Yangtze region
-
摘要: 中上扬子区海相沉积主要表现为T型、H型和TH型3种层序样式,不同层序样式对成藏要素的控制作用不同。相对于T型、TH型,盖层沉积及演化主要受H型样式控制。对于泥质岩盖层,H型样式的二级层序海侵体系域(TST)下部的盖层质量较好;对于膏盐岩盖层,它们多出现于快速海侵、缓慢海退的H型样式的二级层序高水位体系域(HST)中。同时,H型样式泥岩在三级层序内的TST也有利于油气封盖;在湖南古丈县罗依溪镇的栖凤隧道剖面上,由HST到TST,突破压力从小变大,比表面积从大变小,页岩中的砂质含量变小、灰质含量增大,显然,H型样式泥质岩类盖层TST明显比HST好。Abstract: The marine strata in the middle-upper Yangtze region can be divided into 3 types:T,H and TH.Different sequence style has different effect on accumulation.Cap rock deposition and evolution are mainly controlled by the H style.As to muddy cap formations,the cap rocks in the 2nd grade transgre-ssion system tracts(TST)of the H style are good in quality.For gypsum cap formations,the cap rocks in good quality mainly locate in the 2nd grade high-stand system tracts(HST)of the H style,which has experienced fast transgression and slow regression.Meanwhile,the mudstones in the 3rd grade TST of the H style are also favorable for petroleum sealing.On the profile of Qifeng tunnel,Luoyixi Town,Guzhang City,Hunan Province,from HST to TST,breakthrough pressure and calcareousness content increase,while specific surface area and sandy content decrease.It illustrates that the seal capacity of muddy cap rocks in transgression system tracts is better than that in high-stand system tracts.
-
Key words:
- sequence style /
- cap rock /
- preservation condition /
- marine facies deposition /
- Yangtze region
-
[1] 周雁,陈洪德,王成善,等.中扬子区海相地层层序样式及其油气地质意义[J].成都理工学院学报,2002,29(1):26-30. [2] 周雁,陈洪德,王成善,等.克拉通盆地层序样式分布模式研究:以中扬子区为例[J].现代地质,2004,18(2):171-179. [3] 陈洪德,钟怡江,侯明才,等.川东北地区长兴组-飞仙关组碳酸盐岩台地层序充填结构及成藏效应[J].石油与天然气地质,2009,30(5):539-547. [4] 郑荣才.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):370-375. [5] 周雁,汤良杰.开合构造与沉积层序结构样式[J].地质通报,2004,23(3):250-253. [6] 陈洪德,覃建雄,田景春,等.中国南方古生界层序格架中生储盖组合类型及特征[J].石油与天然气地质,2004,25(1):62-69. [7] 陈洪德,庞林,倪新锋,等.中上扬子地区海相油气勘探前景[J].石油实验地质,2007,29(1),13-18. [8] 马永生,楼章华,郭彤楼,等.中国南方海相地层油气保存条件综合评价技术体系探讨[J].地质学报,2006,80(3):406-417. [9] 邓模,吕俊祥,潘文蕾,等.鄂西渝东区油气保存条件分析[J].石油实验地质,2009,31(2):202-206. [10] 沃玉进,汪新伟.中、上扬子地区地质结构类型与海相层系油气保存意义[J].石油与天然气地质,2009,30(2):177-187. [11] 王津义,付孝悦,潘文蕾,等.黔西北地区下古生界盖层条件研究[J].石油实验地质,2007,29(5):477-481. [12] 金之钧,龙胜祥,周雁,等.中国南方膏盐岩分布特征[J].石油与天然气地质,2006,27(5):571-583. -
计量
- 文章访问数: 2649
- HTML全文浏览量: 80
- PDF下载量: 673
- 被引次数: 0
下载:
苏公网安备32021102000780号