徐家围子断陷沙河子组致密砂砾岩气藏的成藏期次及类型划分

发布时间：2018-04-17 02:14

本文选题：松辽盆地 + 徐家围子断陷　；参考：《天然气工业》2017年06期

【摘要】：下白垩统沙河子组是松辽盆地徐家围子断陷最为重要的气源岩之一,但过去对其致密砂砾岩气藏的油气充注时期及成藏期次等研究较少,制约了对该区致密储层成因机制等的认识。为此,基于19块岩石样品273个流体包裹体的均一温度、盐度等测试数据,结合沉积埋藏史和热演化史分析结果,厘定了该区致密砂砾岩气藏的成藏期次;进而通过分析沙河子组储层致密期与成藏期之间的关系,确定了致密气藏的类型。结果表明:(1)该区流体包裹体的均一温度和盐度分布范围较宽,气藏具有长期充注的特点;(2)徐西—徐东地区第1期天然气充注时期在距今94~100 Ma,第2期在距今80~90 Ma,而安达—宋站地区第1期天然气充注时期在距今82~94 Ma,第2期在距今68~82 Ma;(3)安达—宋站地区沙河子组主要发育"先成型"致密气藏,在东斜坡发育"复合型"致密气藏,而徐西—徐东地区沙河子组则以"复合型"致密气藏为主。
[Abstract]:The Shahezi formation of the Lower Cretaceous is one of the most important gas source rocks in Xujiaweizi fault depression in Songliao Basin, but in the past, few researches were made on the hydrocarbon filling period and the secondary stage of hydrocarbon accumulation in its tight sandy conglomerate gas reservoir.It restricts the understanding of the formation mechanism of tight reservoir in this area.Therefore, based on the homogeneous temperature and salinity data of 273 fluid inclusions from 19 rock samples, combined with the analysis of sedimentary burial history and thermal evolution history, the reservoir forming times of dense gravel gas reservoirs in this area are determined.The types of tight gas reservoirs are determined by analyzing the relationship between the tight stage and the reservoir forming stage of Shahezi formation.The results show that the homogeneous temperature and salinity distribution range of fluid inclusions in this area is wide.The gas reservoir has the characteristics of long-term filling.) the gas filling period of the first phase of Xuxi-Xudong area is 94 ~ 100 Ma ago, the second period is 80 ~ 90 MaA, while the first period of natural gas filling period of Anada-Song station area is 822 ~ 94 Ma ago and the second period is at distance.The Shahezi formation in Ananda-Songzheng area is mainly developed into "pre-formed" tight gas reservoirs.The "compound" tight gas reservoir is developed on the east slope, while the "compound" tight gas reservoir is mainly developed in the Shahezi formation of Xuxi-Xudong area.
【作者单位】：中国石油大学(华东)
【基金】：国家青年基金“基于图像法和流体法融合的致密砂岩全孔径孔喉表征及建模”(编号:41602141)、国家青年基金“基于力学平衡远离定量表征致密储层含油饱和度”(编号:41402109) 国家科技重大专项“页岩气储层定量表征及‘甜点区’评价”(编号:2016ZX05061)
【分类号】：P618.13

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