塔里木盆地库车坳陷侏罗系阿合组致密气藏特征与勘探潜力

doi:10.3969/j.issn.1672-7703.2021.04.009

摘要/Abstract

摘要： 塔里木盆地库车坳陷天然气勘探以克拉苏地区的白垩系常规天然气为主，而针对非常规油气研究相对较少，虽然发现多个油气藏，受油气富集规律认识不清等因素影响，尚未开展规模开发。文章以库车坳陷北部构造带迪北气藏为解剖对象，分析了构造断裂特征、气藏流体特征、储层条件等，阐述迪北侏罗系阿合组致密气藏基本特征与油气富集控制因素。迪北气藏发育“三明治”式生储盖组合，顶底板为有效烃源岩夹持厚砂岩储层结构，有效储层与断裂—裂缝合理配置形成地质甜点，控制油气富集与单井产量。在迪北气藏解剖基础上，结合区域烃源岩、规模储层、构造特征等，提出库车坳陷侏罗系阿合组致密气具备形成万亿立方米储量规模的地质条件，是未来致密气勘探现实领域。

关键词: 致密气, 侏罗系, 阿合组, 迪北气藏, 库车坳陷

Abstract: The natural gas exploration in Kuqa Depression mainly focuses on conventional gas of Cretaceous in Kerasu area,
while relatively few studies have been conducted on unconventional oil and gas. Although several oil and gas reservoirs were
discovered, the large-scale natural gas development has not been complemented due to the unclear understanding of hydrocarbon
enrichment rules and other reasons. Taking the Dibei gas reservoir in the northern structural belt of Kuqa Depression as the study
object, this paper analyzes the characteristics of structures and faults, physical properties of gas reservoir and fluid, and reservoir
performance, so as to clarify the basic characteristics of tight gas reservoir of Jurassic Ahe Formation and the controlling factors
of gas enrichment. The study results show that the “sandwiched” source rock-reservoir-caprock assemblage is developed of Dibei
gas reservoir, with effective source rocks at roof and floor of thick sandstone reservoir. The geological “sweet spot” formed by the
configuration of effective reservoir and fault-fracture controls the gas enrichment and single well production. Based on this understanding,and given the regional distribution of hydrocarbon source rocks, large-scale reservoir, and structural characteristics, it is proposed that the Jurassic Ahe Formation has the geological conditions for forming a trillion-cubit-meter-scale tight gas reserve base, which is the realistic field for tight gas exploration in the future.

中图分类号:

TE112

唐雁刚, 杨宪彰, 谢会文, 徐振平, 魏红兴, 谢亚妮. 塔里木盆地库车坳陷侏罗系阿合组致密气藏特征与勘探潜力[J]. 中国石油勘探, 2021, 26(4): 113-124.

Tang Yangang, Yang Xianzhang, Xie Huiwen, Xu Zhenping, Wei Hongxing, Xie Yani. Tight gas reservoir characteristics and exploration potential of Jurassic Ahe Formation in Kuqa Depression, Tarim Basin#br#[J]. China Petroleum Exploration, 2021, 26(4): 113-124.

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