游离相天然气成藏动力连续方程  

Dynamic equations for nonassociated gas accumulation

作　　者：张金川[1] 唐玄[1] 边瑞康[1] 徐波[1] 薛会[1] 聂海宽[1] 姜生玲[1] 

机构地区：[1]中国地质大学(北京)能源学院

出　　处：《石油勘探与开发》2008年第1期73-79,共7页Petroleum Exploration and Development

基　　金：国家自然科学基金(404720734067208740272062)

摘　　要：游离相天然气主要包括置换式运移并聚集的常规储层气、活塞式运移并聚集的根缘气和兼具上述两种运移模式并具有复杂运聚机理的页岩气等,根据游离相天然气运聚的连续性动力平衡方程可以对不同运聚机理类型的天然气进行成藏描述。结合游离相天然气成藏动力平衡方程,常规储层天然气成藏主要受浮力和盖层毛细管压力所控制,连续气柱高度和盖层物性是成藏动力平衡的主要影响因素;根缘气成藏与烃源岩的生气作用强度、储集层物性以及天然气的聚集深度等因素有关,烃源岩的生气有效性和致密储集层的物性条件是约束成藏动力平衡的关键要素;在页岩气成藏的复杂地质条件下,泥页岩的生供气有效性、储集物性、连续气柱高度以及埋藏深度等均是影响其中游离相天然气聚集的基本因素。Nonassociated gas can be classified as conventional gas accumulation with displacement migration, sourcecontacting gas accumulation with piston-type migration, and shale gas accumulation with the displacement and piston-type migrations. Nonassociated gas accumulation can be described by using the continuous but universal dynamic equation. The accumulation of conventional trap gas is controlled by buoyancy and capillary pressure, and the accumulation dynamic equilibrium are influenced by the height of continuous gas column and the physical properties of seal rocks. Sourcecontacting gas accumulation is associated with gas generating intensity of source rocks, physical properties of reservoirs, and accumulation depth, and the accumulation dynamic equilibrium is constrained mainly by the effectiveness of gas generation and the physical properties of tight sand reservoirs. In complicated geological settings of shale gas accumulation, effectiveness of gas generation, physical properties of reservoirs, height of continuous gas column and buried depth are the conditions influencing the accumulation of nonassociated gas.

关 键 词：常规储层气 根缘气 页岩气 成藏动力连续平衡方程 

分 类 号：TE122[石油与天然气工程—油气勘探]