Sand-gathering and reservoir-controlling mechanisms of Paleogene slope-break system in Qikou Sag, Huanghua Depression, Bohai Bay Basin
-
摘要: 通过构造背景入手,充分考虑沉积因素,提出了斜坡区坡折体系的概念,指出黄骅坳陷歧口凹陷发育了构造坡折带(陡坡、缓坡)、挠曲坡折带、沉积坡折带、古地貌坡折带及侵蚀坡折带5种类型,其分布受古构造背景、断裂活动与沉积成岩因素的交互影响.类似于沉积体系,歧口凹陷坡折体系中各种类型坡折带平面上匹配,垂向上共生,其分布达歧口凹陷平面面积的70%以上.坡折带既是物源水下供给通道又是可容纳空间分布区,造就了斜坡及洼陷区的砂体十分富集,砂体分布具有"物源供砂,沟槽输砂,坡折控砂,源型聚砂"的内在机制.广泛发育的储集体使得歧口凹陷古近系油气分布具有满凹含油,叠合连片,优势富集,匹配控藏的典型特征,由此指出了歧北斜坡、滨海斜坡、板桥次凹等的坡折带与洼陷区是目前歧口凹陷古近系地层岩性油气藏勘探的有利区域.Abstract: Based on tectonic background and taking into consideration of sedimentary element,the concept of slope-break system has been proposed.In the Qikou Sag,5 types of slope-break zone have been found in the study area,including tectonic (steep and gentle slopes),flexural,sedimentary,ancient landscape and erosive ones.The distribution of slope-break zone is influenced by ancient tectonic background,fault activity and sedimentary diagenesis.Similar to sedimentary system,various types of slope-break in the Qikou Sag match with each other both horizontally and vertically,accounting for over 70% of the sag area.Slope-break provides underwater channel for source supply,and also offers accommodation,resulting in sand assemblage in slope and depression.Sand distribution is controlled by the following mechanism:source providing sand,groove transporting sand,slope-break controlling sand and source type determining sand gathering.Thanks to wide-distributed reservoir,petroleum has been found all over the sag.The Qibei and Binhai slopes and the Banqiao subsag are the favorable exploration regions for Paleogene lithologic reservoir in the Qikou Sag.
-
Key words:
- slope area /
- slope-break zone /
- slope-break system /
- litho-stratigraphic reservoir /
- Qikou Sag /
- Huanghua Depression /
- Bohai Bay Basin
-
[1] 吕大炜,李增学,孙静,等.浅析陆相湖盆坡折带理论及其对沉积的控制[J].大庆石油地质与开发,2008,27(3):25-27. [2] 王英民,金武弟,刘书会,等.断陷湖盆多级坡折带的成因类型、展布及其勘探意义[J].石油与天然气地质,2003,24(3):199-214. [3] 王颖,王英民,赵志魁,等.松辽盆地南部泉头组四段-姚家组西部坡折带的成因及演化[J].石油勘探与开发,2005,32(3):33-90. [4] 李群,王英民.陆相盆地坡折带的陷蔽油气藏勘探战略[J].地质评论,2003,49(4):445-448. [5] 林畅松,潘元林,肖建新,等.构造坡折带:断陷盆地层序分析和油气预测的重要概念[J].地球科学——中国地质大学学报,2000,25(3):260-266. [6] 王颖,王英民,王晓洲,等.松辽盆地西部坡折带的成因演化及其对地层分布模式的控制作用[J].沉积学报,2005,23(3):498-506. [7] 王英民,刘豪,李立诚,等.准噶尔大型坳陷湖盆坡折带的类型和分布特征[J].地球科学——中国地质大学学报,2002,27(6):683-688. [8] 张善文,王英民,李群.应用坡折带理论寻找隐蔽油气藏[J].石油勘探与开发,2003,30(3):5-7. [9] 李树同,王多云,王彬,等.坳陷型湖盆缓坡边缘沉积坡折带的识别:以鄂尔多斯盆地三叠纪延长期沉积坡折带为例[J].天然气地球科学,2008,19(1):83-88. [10] 王家豪,王华,任建业,等.黄骅坳陷中区大型斜向变换带及其油气勘探意义[J].石油学报,2010,31(3):355-360. [11] 徐长贵,赖维成,薛永安,等.古地貌分析在渤海古近系储集层预测中的应用[J].石油勘探与开发,2004,31(5):53-56. [12] 李阳,邱桂强,刘建民.沉积学研究对济阳断陷湖盆油气勘探开发的推动作用[J].沉积学报,2004,22(3):400-407. [13] 冯有良,徐秀生.同沉积构造坡折带对岩性油气藏富集带的控制作用[J].石油勘探与开发,2006,33(1):22-26. [14] 周立宏,肖敦清,蒲秀刚,等.陆相断陷湖盆复式叠合油气成藏与优势相富集新模式[J].岩性油气藏,2010,22(1):7-10. [15] 蒲秀刚,吴永平,周建生,等.歧口凹陷岩性地层油气藏特征及勘探潜力[J].石油学报,2007,28(2):35-39. [16] 蒲秀刚,柳飒,周建生,等."三元耦合"控藏机制与勘探有利区分析:以渤海湾盆地歧口凹陷古近系岩性地层油气藏为例[J].石油实验地质,2008,30(6):575-579. -
点击查看大图
计量
- 文章访问数: 3231
- HTML全文浏览量: 32
- PDF下载量: 1085
- 被引次数: 0
下载:
苏公网安备32021102000780号