准噶尔盆地腹部隐蔽油气藏类型与成藏主控因素

FORMATION OF THE SUBTLE RESERVOIRS AND THEIR EXPLORATION IN THE CENTRAL JUNGGAR BASIN

牟琨 云金表

Mu Kun Yun Jinbiao

西北大学, 地质学系, 西安, 710069 2. 中国石油化工股份有限公司, 石油勘探开发研究院, 北京, 100083

Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China 2. Exploration and Production Research Institute, SINOPEC, Beijing 100083, China

准噶尔盆地腹部现今处于前陆盆地坳陷中。侏罗纪车莫古隆起的发育,一方面为早期成藏提供了构造背景,另一方面古隆起控制了河流三角洲砂体发育,不整合、地层超覆的分布。故本区形成了地层、岩性、断层三者复合的隐蔽油气藏发育区。后期剧烈的掀斜,导致古隆起周围圈闭类型、圈闭有效性发生变化或减弱。油藏多经历了后期调整、晚期充注,且类型多样。腹部地质背景及其演化,决定了油气形成与分布主要与古隆起及演化有关。

The deep sag was located in the depression of the Junggar foreland basin.The early hydrocarbon accumulation in reservoirs,the development of fluvial-delta sand body and the distribution of unconformity and sequence overlaps were controlled by the Chepaizi-Mosuowan paleo-uplift formed in the Jurassic.The subtle reservoirs consisted of stratigraphic,lithologic,faults or their combination were developed in the area.Due to late strong tilting,trap types and their validity around the paleo-uplift were changed.The reservoirs underwent late modification and late hydrocarbon recharge and various kinds of reservoirs were formed.Hydrocarbon formation and distribution in the deep sag was controlled by the paleo-uplift.

国家攻关项目(2008ZX05002-002)

https://doi.org/10.11781/sysydz201002154