阜新盆地王营-刘家煤层气藏成藏机理  

The Formation Mechanism of Wangying and Liujia Coalbed Reservoirs in Fuxin Basin

作　　者：苏现波[1] 林晓英[1] 柳少波[2] 

机构地区：[1]河南理工大学资源与环境工程学院,河南焦作454003 [2]中国石油勘探开发研究院,北京100083

出　　处：《湖南科技大学学报（自然科学版）》2007年第1期21-24,共4页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家"973"项目(2002CB211705);国家自然科学基金重点项目(50534070-E04)

摘　　要：王营-刘家煤层气藏是阜新盆地最具开发前景的两个煤层气藏．从成藏条件(包括煤层空间展布、资源丰度、储层特征、封闭条件)和成藏过程(煤层气的形成和地下水动力学特征)两个方面对其成藏机理进行了系统探讨．提出:(1)王营-刘家煤层气藏主要以多煤层、巨厚煤层为特征．煤层气含量在6～10 m^3/t左右,资源丰度巨大;(2)这两个煤层气藏形成于古近纪,新近纪至今为调整改造阶段,二者的边界为平安F2断层;(3)早白垩世末期主煤层就已经成熟并开始生烃(R_0=0．5%～0．8%)．次生热成因、次生生物成因气并存．喜山期的岩浆活动造成煤的接触变质并发生二次生烃,但影响有限;(4)该煤层气藏形成后的调整与改造都利于煤的储气能力增加;(5)岩墙的存在沟通了所有含水层和煤层,从而造成多煤层统一成藏．图5,参12．Wangying and Liujia coalbed methane reserveoirs are the optimal blocks for coalbed methane development in the Fuxin Basin. Based on the formation condition （including coal seam geometry, gas resource abundance, reservoir characteristics, and sealing condition） and formation process （including gas generation and hydrodynamics） of coalbed methane reservoirs, the formation mechanism of the two coalbed methane reservoirs were discussed in this paper. Multiple coal seams with huge thickness are the main characteristics. Gas content is 6-10 m^3/t, coalbed methane resources are large. Wangying and Liujia coalbed methane reservoirs, which formed in Paleogene and adjusted from Neogene to present, are a sub-depression of the Fuxin Basin. The two reservoirs are separated by the Pingan F2 fault. The coal seams experienced maturation （Ro=0.5%-0.8%） and generated coalbed methane in the end of the Early Cretaceous. The second coalbed methane generation during the Himalayan Orogeny is due to the intrusion of magma, but the influence belt is very narrow. The migrated thermal genetic and secondary microbial genetic gases exist in the coal. According to the evolution section of gas content, the adjust and reform of coalbed methane reservoir is favorable for enhancing coal adsorption capacity. The dike connects all groundwater aquifers including coal seams. Therefore, all coal seams in the Fuxin Formation conclude one coalbed methane reservoir. 5figs., 12refs.

关 键 词：阜新盆地 气藏边界 煤层气成藏机理 煤层气聚散史 

分 类 号：P618.11[天文地球—矿床学]