论文部分内容阅读
徐家围子断陷深层天然气藏是目前全球唯一在深层成功勘探的非常规火山岩气藏,已探明天然气储量超过2 400×108 m3。气藏围绕深部烃源岩在断裂附近分布,具有明显“源控”、“断控”、“火山机构控制”等特点。从深层烃源岩热模拟实验出发,结合靶区埋藏史、热演化史,对深层烃源岩的生气动力学特征和生气量进行了研究。结果显示:徐家围子断陷深层烃源岩厚度大,有机质丰度高,类型以II型为主,处于高过成熟阶段,生气潜力大。不同层位烃源岩在时间、空间上具有接力生气特点,生气期长。徐家围子断陷深层天然气总生成量为33.75×1012 m3,其中沙河子组烃源岩生气量占总生气量的75.78%,煤系生气总量占深层烃源岩总生气量的25.61%,徐家围子深层天然气资源量为(5 020~7 530)×108 m3(运聚系数取1.6%~2.4%)。
The deep natural gas reservoirs in the Xujiaweizi Fault Depression are the only unconventional volcanic gas reservoirs successfully explored in the world at present. The proven natural gas reserves have exceeded 2 400 × 108 m3. The gas reservoirs are distributed around the deep source rocks near faults, and have obvious characteristics such as “source control”, “fault control”, “volcano control” and so on. Based on the thermal simulation experiments of deep source rocks, the aerodynamic characteristics and gas generation of deep source rocks are studied in combination with the burial history and thermal history of target areas. The results show that the deep source rocks in the Xujiaweizi Fault Depression have a large thickness and a high abundance of organic matter. The type is mainly type II, which is at a stage of over-ripening and has high potential for gas generation. Source rocks of different layers have the characteristics of relay force in time and space, with long life cycle. The total amount of deep natural gas in the Xujiaweizi Fault Depression is 33.75 × 1012 m3, in which the gas generation amount of source rocks in Shahezi Formation accounts for 75.78% of the total gas production, the total amount of coal-bearing gas generation accounts for 25.61% of the total gas generation in deep source rocks, The deep natural gas resources of Xujiaweizu are (5 020 ~ 7 530) × 108 m3 (migration and accumulation coefficient take 1.6% ~ 2.4%).