摘要
川中—川西地区上三叠统属煤系地层, 烃源丰富, 储层发育, 圈闭众多, 保存条件良好, 具备大中型气田的形成条件。但天然气成藏机制较为复杂。因此, 天然气成藏主控因素研究显得非常重要。通过已发现典型气田的成藏剖析, 认为天然气成藏主控因素为: 第一储渗条件较好的储层; 第二规模较大、形成较早的古隆起背景上的古圈闭; 第三运移通道。并以此 3个条件相互匹配的区域成藏最有利。综合考虑天然气成藏主控因素和运聚规律, 提出了下部勘探的有利区带。
The Upper-Triassic coal measure strata in central-west Sichuan region, abundant in hydrocarbon sources, grown in reservoirs, numerous in traps, and good in preservative condition, own the condition of forming gas fields of large-medium scale, but the gas accumulating mechanism is rather complicated, therefore the study on main controlling factors of gas accumulating appears unusually important. Through the accumulating dissection of already discovered typical gas fields, it is deemed that the gas accumulating main factors are: 1.reservoirs with better condition of storage and permeation, 2.palaeotrap of larger scale and on the background of earlier forming palaeohigh, 3.there being migrating passages; and where these 3 conditions match mutually is the most favorable region for accumulating. By comprehensively considering the main controlling factors and the migrating and collecting rules of gas accumulating, the beneficial belts in the next step exploration have been put forward.
出处
《天然气勘探与开发》
2005年第1期5-7,共3页
Natural Gas Exploration and Development
