准噶尔盆地阜康凹陷白垩系清水河组低位体系域充填模式及油气勘探意义

doi:10.3969/j.issn.1672-7703.2021.05.007

摘要/Abstract

摘要： 为了明确准噶尔盆地白垩系清水河组是否发育低位体系域砂体，低位体系域砂体是否具有勘探潜力，对阜康凹陷清水河组低位体系域砂体形成条件、沉积特征和沉积模式进行了分析，并对成藏条件进行研究。结果表明：准噶尔盆地白垩系清水河组底部为三级层序界面，且阜康凹陷沉降中心附近发育多级坡折，为低位体系域砂体发育创造了条件，并提出大型坳陷湖盆坡折之下发育多期低位体系域砂体，岩性圈闭条件优越。低位体系域砂体厚度大、面积广、储层优，侧向封堵条件优越，且研究区发育深层和浅层两组断裂，在垂向上构成“Ｙ”形组合，可沟通烃源岩和低位体系域砂体，证实研究区低位体系域砂体成藏条件优越，为下一步岩性油藏最有利勘探领域。

关键词: 准噶尔盆地, 阜康凹陷, 清水河组, 低位体系域, 岩性圈闭, 油气勘探

Abstract: The deposition conditions, sedimentary characteristics and deposition pattern of lowstand system tract sandstone are
analyzed and hydrocarbon accumulation conditions studied, so as to identify the development degree of lowstand system tract
sandstone of Qingshuihe Formation in Fukang Sag in Junggar Basin and its exploration potential. The study results show that base
Cretaceous Qingshuihe Formation is a third-order sequence boundary, and multi-stage slope breaks are developed near the
depo-center of Fukang Sag, providing favorable conditions for the deposition of lowstand system tract sandstone. Multi-stage
lowstand system tract sandstones are developed below the slope break of large-scale depressed lake basin, with large thickness,
widespread area, superior reservoir physical property and lateral sealing capacity, which have good conditions for developing
lithologic traps. In addition, two sets of faults are developed in deep and shallow formations, forming a “Y” shaped configuration
in vertical direction, and connecting source rock with lowstand system tract sand bodies. As a result, the lowstand system tract fan
sand body in the study area has excellent hydrocarbon accumulation conditions, which is the most favorable field for lithologic oil
reservoir exploration in the near future.

中图分类号:

TE111

厚刚福, 宋兵, 陈扬, 王力宝, 曾德龙, 贾开富, 窦洋, 李亚哲, 陈希光, 彭博, 郭华军, 邹志文. 准噶尔盆地阜康凹陷白垩系清水河组低位体系域充填模式及油气勘探意义[J]. 中国石油勘探, 2021, 26(5): 74-82.

Hou Gangfu, Song Bing, Chen Yang, Wang Libao, Zeng Delong, Jia Kaifu, Dou Yang, Li Yazhe, Chen Xiguang, Peng Bo, Guo Huajun, Zou Zhiwen. Filling model of lowstand system tract of Cretaceous Qingshuihe Formation in Fukang Sag in Junggar Basin and its signifi cance on petroleum exploration[J]. China Petroleum Exploration, 2021, 26(5): 74-82.

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