川东北罗家寨飞仙关组气藏成藏过程及聚集效率

doi:10.11743/ogg20050612

摘要/Abstract

摘要：

罗家寨下三叠统飞仙关组气田是四川盆地迄今为止储量规模超过500×10⁸m³,居第3位的大型气田。天然气甲烷含量一般为75.29%～84.95%,乙烷含量0.07%～0.11%,硫化氢含量7.13%～10.49%,为高含硫化氢的过成熟干气。罗家寨气田气源主要为上二叠统烃源岩,富集在中下三叠统区域性膏盐岩盖层之下、受断裂控制的构造圈闭中,属于下生上储顶盖的它源近常压的垂向运移成藏系统,成藏条件优越。储层中普遍存在的沥青为古油藏原油裂解成气的中间产物,并且沥青含量与储层孔隙度及天然气产能呈正相关。气藏的形成主要经历了印支晚期-燕山早中期的鲕粒岩聚油气、液态烃类深埋裂解以及喜马拉雅期的构造形成、流体进行局部调整、构造控气的成藏过程,烃类充注期主要为中-晚侏罗世。高效的输导体系、优质的储集空间以及良好的封堵条件,确保了罗家寨气田较高的聚集效率。

关键词: 成藏过程, 聚集效率, 天然气藏, 沥青, 飞仙关组, 四川盆地

Abstract:

Luojiazhai gas field in Lower Triassic Feixianguan Fm is the third largest gas field in Sichuan basin with gas reserves of over 50 BCM.The natural gas is overmature high H₂S dry gas,with methane content gene-rally in the range of 75.29%-84.95%,ethane content in the range of 0.07%-0.11%,and hydrogen sulfide content in the range of 7.13%-10.49%.Natural gas in Luojiazhai gas field are mainly sourced from the Upper Permian and enriched in the structural traps overlain by the(Lower-Middle)Triassic regional gypsum-halite cap rock,and are controlled by faults.This gas field is of vertical migration and accumulation system with near-normal pressure and allogenetic gas source,i.e.,hydrocarbons have been generated from the source rocks below,accumulated in the reservoirs above and sealed by caprock on the top.It is superior in reservoiring conditions.Bitumens that commonly occur in the reservoirs are the intermediate products resulting from pyrolysis of crude oil into gas in fossil oil reservoirs,and the content of bitumen is positively correlated with porosity and gas deliverability.The gas pool has experienced several processes,such as hydrocarbon accumulating in oolitic rocks and liquid hydrocarbon being deeply buried and pyrolyzed during Late(Indosinian-Early)and Middle Yan-shanian,as well as gas accumulation controlled by structure in the course of structure formation and local adjustment of fluids during Himalayan.(Middle-Late)Jurassic is the main hydrocarbon charging period. The high accumulation efficiency of Luojiazhai gas field has been ensured by the highly efficient carrier system,good reservoir space and favorable sealing conditions.

Key words: reservoiring process, accumulation efficiency, gas pool, bitumen, Feixianguan Formation, Sichuan basin

中图分类号:

TE112.1

谢增业,李剑,单秀琴,等. 川东北罗家寨飞仙关组气藏成藏过程及聚集效率[J]. 石油与天然气地质, 2005, 26(6): 765-769. doi: 10.11743/ogg20050612 Xie Zengye,Li Jian,Shan Xiuqin,et al. Reservoiring process and accumulation efficiency of Feixianguan Formation gas pool in Luojiazhai,northeastern Sichuan basin[J]. Oil & Gas Geology, 2005, 26(6): 765-769. doi: 10.11743/ogg20050612

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