中国石油勘探

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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#br#

厚刚福1,宋兵1,陈扬1,王力宝1,曾德龙2,贾开富2,窦洋1,李亚哲1,陈希光1,彭博1,郭华军1,邹志文1
  

  1. 1 中国石油杭州地质研究院;2 中国石油新疆油田公司勘探开发研究院
  • 作者简介:厚刚福(1982-),男,甘肃静宁人,硕士,2007 年毕业于吉林大学地球科学学院,现从事沉积储层研究及油气勘探方面的工作。地址:浙江省杭州市西湖区西溪路920 号,邮政编码:310023。
  • 基金资助:
    国家科技重大专项“大型岩性油气藏形成主控因素与有利区带评价”(2017ZX05001-002),“准噶尔盆地岩性地层油气藏富集规律及目标评价”(2017ZX05001-004);中国石油重大科技专项“准噶尔盆地油藏富集规律及勘探技术研究与应用”(2017E-0401),“大型陆相盆地砂体类型及控藏机制”(2019B-0309)。

Filling model of lowstand system tract of Cretaceous Qingshuihe Formation in Fukang Sag in Junggar Basin and its significance on petroleum exploration#br# #br#

Hou Gangfu1, Song Bing1, Chen Yang1, Wang Libao1, Zeng Delong2, Jia Kaifu2, Dou Yang1, Li Yazhe1,Chen Xiguang1, Peng Bo1, Guo Huajun1, Zou Zhiwen1#br#   

  1. 1 PetroChina Hangzhou Research Institute of Geology; 2 Research Institute of Exploration & Development, PetroChina Xinjiang Oilfield Company

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: In this paper, 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 depression basin, with large thickness, widespread area, superior reservoir property and lateral sealing capacity,which have good lithologic trap conditions. In addition, two sets of faults are developed in deep and shallow formations, forming a “Y” shape combination in vertical direction, and connecting source rock with lowstand system tract sand body. 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 next step.

Key words: Junggar Basin, Fukang Sag, Qingshuihe Formation, lowstand system tract, lithologic trap, oil and gas exploration

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