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| 1 | Buoyance-driven hydrocarbon accumulation depth and its implication for unconventional resource prediction显示文摘The discovery of unconventional hydrocarbon resources since the late 20th century changed geologists’understanding of hydrocarbon migration and accumulations and provides a solution to energy shortage.In 2016,unconventional oil production in the USA accounted for 41%of the total oil production;and unconventional natural gas production in China accounted for 35%of total gas production,showing strong growth momentum of unconventional hydrocarbons explorations.Unconventional hydrocarbons generally coexist with conventional petroleum resources;they sometimes distribute in a separate system,not coexisting with a conventional system.Identification and prediction of unconventional resources and their potentials are prominent challenges for geologists.This study analyzed the results of 12,237 drilling wells in six representative petroliferous basins in China and studied the correlations and differences between conventional and unconventional hydrocarbons by comparing their geological features.Migration and accumulation of conventional hydrocarbon are caused dominantly by buoyance.Wepropose a concept of buoyance-driven hydrocarbon accumulation depth to describe the deepest hydrocarbon accumulation depth driven dominantly by buoyance;beyond this depth the buoyance becomes unimportant for hydrocarbon accumulation.We found that the buoyance-driven hydrocarbon accumulation depth in petroliferous basins controls the different oil/gas reservoirs distribution and resource potentials.Hydrocarbon migration and accumulations above this depth is dominated by buoyancy,forming conventional reservoirs in traps with high porosity and permeability,while hydrocarbon migration and accumulation below this depth is dominated by non-buoyancy forces(mainly refers to capillary force,hydrocarbon volumeexpansion force,etc.),forming unconventional reservoirs in tight layers.The buoyance-driven hydrocarbon accumulation depths in six basins in China range from 1200mto 4200 m,which become shallowerwith increasing geothermal gradient,decreasing particle size of sandstone reservoir layers,or an uplift in the whole petroliferous basin.The predicted unconventional resource potential belowthe buoyance-driven hydrocarbon accumulation depth in six basins in China is more than 15.71×10^(9) t oil equivalent,among them 4.71×10^(9) t reserves have been proved.Worldwide,94%of 52,926 oil and gas reservoirs in 1186 basins are conventional reservoirs and only 6%of them are unconventional reservoirs.These 94%conventional reservoirs show promising exploration prospects in the deep area below buoyance-driven hydrocarbon accumulation depth. | Xiongqi Pang Chengzao Jia Wenyang Wang Zhangxin Chen Maowen Li Fujie Jiang Tao Hu Ke Wang Yingxun Wang | 2021 | Geoscience Frontiers2021，12，4： | 9 |
| 2 | 地层抬升引发的天然气膨胀及其聚集效应——以鄂尔多斯盆地苏里格气田为例显示文摘应用大量地球化学、流体包裹体和生产动态等资料,对鄂尔多斯盆地苏里格气田晚白垩世以来大幅度抬升引发的天然气膨胀及其聚集效应进行研究。结果表明,晚白垩世以来,盆地显著抬升引发的天然气膨胀作用是苏里格气田致密砂岩气后期调整和二次充注的重要动力。抬升引起烃源岩中滞留的天然气体积膨胀导致天然气再次排出并运移充注到储集层,从而形成二次聚集效应,致密储集层中天然气的膨胀则引起含气饱和度、含气面积及气柱高度增加,进一步提高了储集层含气性,形成规模天然气聚集调整事件。整体上,苏里格气田经历早白垩世末前埋藏和晚白垩世以来抬升两期天然气聚集过程,埋藏阶段天然气主要受生烃超压驱动运移并聚集,抬升阶段则为天然气体积膨胀产生的膨胀力驱动的储集层内部调整和二次充注聚集。总体上,气田东部抬升阶段的天然气调整及二次充注聚集效应大于西部,有利于形成富气区。 | 李军 赵靖舟 魏新善 尚晓庆 吴伟涛 吴和源 陈梦娜 | 2022 | 石油勘探与开发2022，49，6： | 2 |
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