摘要
玛湖凹陷是准噶尔盆地最富生烃凹陷,凹陷斜坡区处于油气运移优势指向区,三叠纪发育大型古背斜与鼻凸构造,具备形成大型油气聚集区的有利构造条件,油气沿三叠系与二叠系之间不整合面运移,在鼻凸带聚集成藏。三叠系百口泉组埋藏浅,发育扇三角洲前缘有利相带,具备大面积成藏的储集、封闭、输导以及聚集等地质条件。在扇控大面积成藏模式的指导下,通过不断深化成藏主控因素研究,发现扇三角洲前缘相带控制储层物性与含油气性,相带与物源的远近控制油气的富集与高产。通过重新认识相邻扇体,发现了多个高效优质储量区块。勘探实践表明,玛湖凹陷斜坡区三叠系百口泉组具备扇控大面积成藏特征,是新疆油田现实油气储量与产量新基地。
Mahu depression is the most hydrocarbon abundant depression in Junggar Basin. The slope zone of the depression is located in the advantageous oil and gas migration area with development of large-scale Triassic paleo-anticline and nose structure. It has the favorable structural conditions for hydrocarbon accumulations on a large scale. Hydrocarbon migrates along the unconformity surface between Triassic and Permian and accumulated in the nose uplift zone. The Triassic Baikouquan Formation is shallowly buried, where the fan delta frontal favorable facies zone developed. The slope zone has the geological conditions of reservoir, sealing, and conducting for large-scale hydrocarbon accumulations. Guided by the pattern of fan-controlled large-area accumulation and based on the study of the main factors controlling accumulations, it is found that the fan delta frontal facies zone controlled the physical properties and oil bearing properties of reservoirs while the facies zone and material source controUed oil and gas abundance and high yield. A number of blocks with effective and quality reserves were found on the basis of re-identification of the neighboring fan bodies. Exploration practice indicates that the Triassic Baikouquan Formation in the slope zone of Mahu depression is characterized as fan-controlled large-area accumulation and becomes a new base to increase oil and gas reserves and production for PetroChina＇s Xinjiang oilfield.
出处
《中国石油勘探》
CAS
2014年第6期14-23,共10页
China Petroleum Exploration
基金
中国石油天然气股份有限公司"新疆大庆"重大科技专项"新疆和吐哈油田油气持续上产勘探开发关键技术研究"(2012E-34-01)
关键词
准噶尔盆地
玛湖凹陷
斜坡区
三叠系
百口泉组
扇控
大面积
成藏模式
Junggar Basin, Mahu depression, slope zone, Triassic, Baikouquan Formation, fan-controlled, large area, accumulation pattern
