西南石油大学学报(自然科学版) ›› 2008, Vol. 30 ›› Issue (2): 9-13.

• 地质勘探 • 上一篇    下一篇

琼东南盆地第三系低位储层特征及其控制因素

肖 军,王 华,姜 华,等   

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2008-04-20 发布日期:2008-04-20

Characteristics and Controlling Factors of the Reservoirs of Lowstand System Tract in Tertiary,Qiongdongnan Basin

XIAO Jun et al   

  • Received:1900-01-01 Revised:1900-01-01 Online:2008-04-20 Published:2008-04-20

摘要: 由低位储集体构成的岩性-地层圈闭是琼东南盆地油气圈闭的重要类型和主要后备。琼东南盆地主要发育盆底扇、斜坡扇、低位楔等低位体,它们与下切谷一起构成低位体系域特征的谷-扇沉积体系。深入地分析了琼东南盆地低位储集体的控制因素:(1) 古构造背景;(2) 物源条件(物源区岩性、陆架岩性、陆架宽窄以及古河道搬运距离和能力等);(3) 沉积环境和后期成岩作用;(4) 异常地层压力的分布。综合评价指出盆地西部和东部断裂交叉断角部位的陵水组低位体为较有利勘探目标,而北部隆起带及其南部紧邻富生烃凹陷地区S60、S50、S40界面上的低位体为最有利的勘探目标。

关键词: 琼东南盆地, 第三系, 低位储集体, 分布特征, 控制因素

Abstract: Lithological-stratigraphic traps, which consist of most lowstand sand bodies, are important type and significant reserve of hydrocarbon traps in Qiongdongnan Basin. Basin floor fan, slope fan and lowstand wage are major lowstand sand bodies in this basin, and they form typical valley-fan sedimentary system with incised-valley. In this paper, their controlling factors are analyzed in detail, which includ paleostructural background, provenance conditions (provenance lithology, shelf lithology, shelf width, transporting distance and ability of paleochannel, etc), sedimentary environment and diagenesis and distribution of abnormal geopressure. Through integrated evaluation, it is suggested that slope fans of Lingshui Formation in fault crossing position in western and eastern basin are favorable exploration targets, and lowstand sand bodies on S60, S50, S40sequence boundary in northern uplift zone and its southern hydrocarbon abundant area are the best exploration targets.

Key words: Qiongdongnan Basin, Tertiary, reservoirs of lowstand system tract, distribution characteristics, controlling factors