伏龙泉断陷沙河子组一登娄库组天然气地球化学特征与成藏过程

Geochemical characteristics of natural gas and accumulation process of the Shahezi Formation and Denglouku Formation in the Fulongquan Fault Depression

摘要

基于天然气地球化学、储层流体包裹体等实验，研究伏龙泉断陷沙河子组与登娄库组气藏天然气来源、成藏期次及成藏过程。结果表明：登娄库组天然气为煤成气，烃源岩以本地沙河子组为主；沙河子组油气成藏始于泉头组沉积末期，持续充注至嫩江组沉积末期；登娄库组天然气以明水组沉积末期成藏为主，源内沙河子组利于原生气藏形成，源外登娄库组天然气为深层高成熟度天然气调整改造再成藏；烃源岩层系发育的正向古构造或原生古圈闭、反转期通＂源＂断层与泉头组盖层的有效配置是控制登娄库组天然气成藏的关键；断陷中部凸起带两侧紧临生烃中心，通＂源＂断层发育，利于源外登娄库组成藏；向生烃洼陷区断层末端挤压应力强，源内致密气保存条件好，是下一步勘探的有利方向。

Abstract

Taking the Shahezi Formation and Denglouku Formation gas reservoirs in the Fulongquan Fault Depression as an example, based on the experimental analysis of source rocks, natural gas geochemistry, reservoir fluid inclusions and isotopes of carbonate cement, it carried out studies on gas source correlation, accumulation history and reservoir formation process. The results show that the gas in the Denglouku Formation is coal-derived and the source rock is primarily the local Shahezi Formation. The accumulation of oil and gas in the Shahezi Formation began at the end of Quantou Formation and continued to be charged until the end of Nenjiang Formation. The natural gas accumulation in Denglouku Formation is mainly in late Mingshui Formation. Shahezi Formation is conducive to the formation of primary gas reservoir. Natural gas of Denglouku Formation is reformed from deep and high maturity natural gas. The key to controlling the gas accumulation in Denglouku Formation is the positive paleostructure or primary paleotrap developed in the source rock layers, the effective allocation of the "through-source" fault and the cap layer of Quantou Formation. Both sides of the uplift belt in the middle of the fault depression are close to the hydrocarbon generating center, and the "through-source" fault develops, which is conducive to the formation of gas reservoirs in Denglouku Formation. The extruding stress at the end of the fault in the hydrocarbon generating depression area is strong, and the tight gas in - VI -the source is well preserved, which is the favorable direction for the next exploration.

关键词

烃源岩 / 气源对比 / 成藏期次 / 天然气成藏 / 伏龙泉断陷 / 地球化学特征

Key words

source rock / gas source correlation / accumulation period / natural gas accumulation / Fulongquan Fault Depression / geochemical characteristics

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基金资助

中国石油天然气集团公司＂十四五＂前瞻性基础性重大科技项目(2021DJ0205)