The successful development of unconventional hydrocarbons has significantly increased global hydrocarbon resources, promoted the growth of global hydrocarbon production and made a great breakthrough in classical oil a...The successful development of unconventional hydrocarbons has significantly increased global hydrocarbon resources, promoted the growth of global hydrocarbon production and made a great breakthrough in classical oil and gas geology. The core mechanism of conventional hydrocarbon accumulation is the preservation of hydrocarbons by trap enrichment and buoyancy, while unconventional hydrocarbons are characterized by continuous accumulation and non-buoyancy accumulation. It is revealed that the key of formation mechanism of the unconventional reservoirs is the self-sealing of hydrocarbons driven by intermolecular forces. Based on the behavior of intermolecular forces and the corresponding self-sealing, the formation mechanisms of unconventional oil and gas can be classified into three categories:(1) thick oil and bitumen, which are dominated by large molecular viscous force and condensation force;(2) tight oil and gas, shale oil and gas and coal-bed methane, which are dominated by capillary forces and molecular adsorption;and(3) gas hydrate, which is dominated by intermolecular clathration. This study discusses in detail the characteristics, boundary conditions and geological examples of self-sealing of the five types of unconventional resources, and the basic principles and mathematical characterization of intermolecular forces. This research will deepen the understanding of formation mechanisms of unconventional hydrocarbons, improve the ability to predict and evaluate unconventional oil and gas resources, and promote the development and production techniques and potential production capacity of unconventional oil and gas.展开更多
基金Supported by the Gas-bearing Evolution Characteristics and Genetic Mechanism of Continental Shale Oil and Mobile Oil Evaluation Method(41872148)。
文摘The successful development of unconventional hydrocarbons has significantly increased global hydrocarbon resources, promoted the growth of global hydrocarbon production and made a great breakthrough in classical oil and gas geology. The core mechanism of conventional hydrocarbon accumulation is the preservation of hydrocarbons by trap enrichment and buoyancy, while unconventional hydrocarbons are characterized by continuous accumulation and non-buoyancy accumulation. It is revealed that the key of formation mechanism of the unconventional reservoirs is the self-sealing of hydrocarbons driven by intermolecular forces. Based on the behavior of intermolecular forces and the corresponding self-sealing, the formation mechanisms of unconventional oil and gas can be classified into three categories:(1) thick oil and bitumen, which are dominated by large molecular viscous force and condensation force;(2) tight oil and gas, shale oil and gas and coal-bed methane, which are dominated by capillary forces and molecular adsorption;and(3) gas hydrate, which is dominated by intermolecular clathration. This study discusses in detail the characteristics, boundary conditions and geological examples of self-sealing of the five types of unconventional resources, and the basic principles and mathematical characterization of intermolecular forces. This research will deepen the understanding of formation mechanisms of unconventional hydrocarbons, improve the ability to predict and evaluate unconventional oil and gas resources, and promote the development and production techniques and potential production capacity of unconventional oil and gas.
文摘墨西哥油气资源非常丰富,Southeastern盆地是墨国最主要的含油气盆地。目前,Tampico-Misantla盆地是墨西哥第二大含油气盆地,已探明2 P储量66亿桶油当量。常规油气勘探潜力仅次于墨西哥湾深水区和Southeastern盆地,该盆地也是墨西哥最主要的非常规油气分布区。Tampico-Misantla盆地油气主要聚集于盆地东南黄金水道环礁区油田(Golden Lane Atoll)、西南部的Chicontepec次盆和北部的Altamira区域。Tampico-Misantla盆地已证实两套含油气系统。侏罗-白垩系-第三系含油气系统是最主要的含油气系统。侏罗系Pimienta层优质烃源岩在盆地内广泛分布。白垩系碳酸盐岩储层是盆地最重要的储层,除环礁区油田以外,储层主要以低孔低渗的白垩系碳酸盐岩和第三系Chicontepec浊积砂岩为主。盖层主要是晚白垩系灰岩和第三系泥岩。盆地位于西部马德雷山脉隆起区与东部大陆架断裂带之间,从中-上侏罗系到第三系发育多种类型的圈闭。在Chicontepec次盆,第三系大型古河道内发育的浊积扇体是最有利的勘探目标。Chicontepec油区老油田2 P储量巨大,但采收率都很低,具有很大的开发潜力。Chicontepec油区与Altamira油区之间的广大勘探区域是非常规页岩油气的主要勘探领域,油气资源潜力巨大。
